DEF 14A of AdvanSix Inc., Apr 29, 2026

DEF 14A of AdvanSix Inc.

Filed Apr 29, 2026 · FY20250001673985-26-000022

Open on EDGAR

  1. NOMINEES FOR ELECTION

    NOMINEES FOR ELECTION

  2. NOMINEES FOR ELECTION

    | Jeffrey J. Bird | | | | Mr. Bird (59) currently serves as Interim President and Chief Operating Officer of Envent Corporation, a private company that provides environmental and industrial solutions for the petrochemical industry that minimize environmental impact while maximizing operational efficiency, where he has also served as a member of the Board of Advisors since January 2025. Mr. Bird is also currently a director of Heath Consultants, a private company specializing in methane detection. Mr. Bird was formerly President, Chief Executive Officer and a Director of Dril-Quip, an offshore drilling and production equipment manufacturer. He joined Dril-Quip in March 2017 as Vice President and Chief Financial Officer, and then served from February 2019 to May 2020 as Senior Vice President – Production Operations and Chief Financial Officer, from May 2020 to January 2022 as President and Chief Operating Officer, and from January 2022 through 2024 as President and Chief Executive Officer and as a Director. From December 2014 through February 2017, he was Executive Vice President and Chief Financial Officer of Frank’s International, a provider of engineered tubular services to the oil and gas industry. Prior to joining Frank’s International, Mr. Bird had served as the Vice President of Finance and Chief Financial Officer of Ascend Performance Materials, a provider of chemicals, fibers and plastics, from September 2010. Prior to joining Ascend, Mr. Bird served in a variety of accounting and finance roles, primarily in the industrial manufacturing sector including serving as a division Chief Financial Officer at Danaher Corporation. Mr. Bird’s qualifications to serve on the Board include his executive experience in the global manufacturing and chemicals industry. He also brings to the Board extensive experience with financial and accounting expertise, operations, senior leadership, business strategy, and public company governance. Mr. Bird has served as a director of AdvanSix since January 2026. | | | Board Committees: Audit; Health, Safety and Environmental |

  3. NOMINEES FOR ELECTION

    | Erin N. Kane | | | | Ms. Kane (49) has been President and Chief Executive Officer and a director of AdvanSix since the spin-off on October 1, 2016. Prior to joining AdvanSix, Ms. Kane served as Vice President and General Manager of Honeywell Resins and Chemicals since October 2014. She joined Honeywell in 2002 as a Six Sigma Blackbelt of Honeywell’s Specialty Materials business. In 2004, she was named Product Marketing Manager of Honeywell’s Specialty Additives business. From 2006 until 2008, Ms. Kane served as Global Marketing Manager of Honeywell’s Authentication Technologies business, and in 2008 she was named Global Marketing Manager of Honeywell’s Resins and Chemicals business. In 2011, she was named Business Director of Chemical Intermediates of Honeywell’s Resins and Chemicals business. Prior to joining Honeywell, Ms. Kane held Six Sigma and process engineering positions at Elementis Specialties and Kvaerner Process. Ms. Kane serves on the Boards of Directors of the Chemours Company (NYSE: CC), and the American Chemistry Council. She brings to the Board her extensive leadership experience as well as knowledge of AdvanSix’s business, industry, operations/HS&E and sustainability, and public company governance. |

  4. NOMINEES FOR ELECTION

    | Todd D. Karran | | | | Mr. Karran (61) has served as the Chief Executive Officer Petrochemicals of Inter Pipeline, an energy infrastructure business engaged in the transportation, processing and storage of energy products across Western Canada and Europe, since May 2022. He was formerly the President and Chief Executive Officer of NOVA Chemicals, a leading producer of polyethylene and expandable styrenics, from 2015 until his retirement in August 2020. Prior to that, he served as Senior Vice President and Chief Financial Officer of NOVA Chemicals from 2009 until 2016. Mr. Karran joined NOVA Chemicals in 1985 and held various other positions since then, including management, accounting and financial roles such as Vice President and Controller, Tax Compliance Specialist and Manager of Financial Services. From 2006 until 2007, he served as NOVA Chemicals’ Vice President and Chief Information Officer. From 2007 until 2009, he served as NOVA Chemicals’ Treasurer and Vice President of Corporate Development. Mr. Karran was a director of NOVA Chemicals from 2015 through 2020. He brings to the Board the leadership, management oversight and financial experience gained through his roles as a director of and in various senior management leadership roles at NOVA Chemicals, with extensive chemicals industry experience including operations/HS&E and sustainability, global business, as well as strategy development and growth. Mr. Karran is Chair of the Board and has served as a director of AdvanSix since the spin-off from Honeywell on October 1, 2016. |

  5. NOMINEES FOR ELECTION

    | 3 | Proxy and Notice of Annual Meeting of Stockholders | 2026 |

  6. NOMINEES FOR ELECTION

    | Gena C. Lovett , Ph.D. | | | | Dr. Lovett (63) has a Ph.D. in Values Driven Leadership from Benedictine University. Dr. Lovett previously was the Vice President, Operations, Defense, Space and Security, of The Boeing Company, a manufacturer of airplanes, between July 2015 and June 2019. She served as Global Chief Diversity Officer between January 2012 and June 2015, and as Director, Manufacturing, Forgings, between July 2007 and January 2012, of Alcoa Corporation, a manufacturer of aluminum. She served in numerous roles with Ford Motor Company, a manufacturer of cars and trucks, between April 1992 and June 2007, including as Plant Manager, New Model Programs. She received a B.A. degree from The Ohio State University, an M.B.A. degree from The Baker Center for Graduate Studies, and an M.Sc. from Benedictine University. Dr. Lovett is a director of Trex Company, Inc. (Nasdaq: TREX) and QuantumScape Corporation (NYSE: QS). She brings to the Board extensive experience with senior leadership, business strategy, public company governance, as well as management oversight, including with respect to corporate culture and operations/HS&E. Dr. Lovett has served as a director of AdvanSix since September 2021. | | | Board Committees: Health, Safety and Environmental; Nominating and Governance |

  7. NOMINEES FOR ELECTION

    | Donald P. Newman | | | | Mr. Newman (61) served as Executive Vice President, Finance and Chief Financial Officer of ATI Inc., a global producer of high-performance materials and solutions for the global aerospace and defense markets and critical applications in electronics, medical and specialty energy, from January 2022 through December 31, 2025. Mr. Newman previously served as ATI’s Senior Vice President, Finance and Chief Financial Officer from January 2020 through December 2021. He joined ATI in January 2020, having served as Chief Financial Officer of Stelco Holdings, Inc. from August 2017 through December 2019. Previously, Mr. Newman was Chief Financial Officer of Headwaters Incorporated from December 2010 until it was acquired in May 2017. In previous roles, Mr. Newman served as Vice President – Controller and Interim Chief Financial Officer at Boart Longyear Limited and as Chief Accounting Officer at ACI Worldwide, Inc., and held leadership roles for over 12 years at NRG Energy, Inc. Mr. Newman is a director of Amrize Ltd. (NYSE: AMRZ), a building solutions company. He brings to the Board extensive experience with financial and accounting expertise, operations/HS&E, senior leadership, business strategy, and public company governance. Mr. Newman has served as a director of AdvanSix since August 2024. | | | Board Committees: Audit; Health, Safety and Environmental |

  8. NOMINEES FOR ELECTION

    | Dana O'Brien | | | | Ms. O'Brien (58) served as Senior Vice President and Chief Legal Officer of Olin Corporation, a manufacturer of chemical products, from November 2021 through February 28, 2025, and then served as Special Advisor to the CEO until her retirement on July 31, 2025. She also served as Secretary of Olin from November 2021 through April 2024. Prior to joining Olin, Ms. O’Brien had served as Senior Vice President and General Counsel at The Brink’s Company, an NYSE-listed company that is a leading global provider of cash and valuables management, digital retail solutions, and ATM managed services, from April 2019 to November 2021. Prior to that, Ms. O’Brien served as Senior Vice President and General Counsel of CenterPoint Energy, a Fortune 500, NYSE-listed company that provides electric transmission and distribution, natural gas distribution, and energy services operations from May 2014 until March 2019. From 2007 to 2014, Ms. O’Brien served as Chief Legal Officer and Chief Compliance Officer for CEVA Logistics, plc., a global provider of contract logistics and freight forwarding services located in the Netherlands and publicly traded on the SIX Swiss Exchange in Switzerland. Prior to that, between 2005 and 2007, she served as General Counsel, Chief Compliance Officer and Secretary of EGL, Inc., which was acquired by CEVA Logistics. Ms. O’Brien also previously served as Vice President, Secretary and General Counsel, from 2001 to 2005 of Quanta Services, Inc., an NYSE-listed construction and service provider to the energy and utility industries. Ms. O'Brien is a director of Sterling Infrastructure, Inc. (Nasdaq: STRL), an infrastructure services provider of e-infrastructure, building and transportation solutions. She brings to the Board extensive experience with public company governance, regulatory and compliance, senior leadership, and business strategy, having served as general counsel of multiple public companies. Ms. O'Brien has served as a director of AdvanSix since September 2025. | | | Board Committees: Compensation and Leadership Development; Nominating and Governance |

  9. NOMINEES FOR ELECTION

    | 4 | Proxy and Notice of Annual Meeting of Stockholders | 2026 |

  10. NOMINEES FOR ELECTION

    | Daryl Roberts | | | | Mr. Roberts (57) served as Senior Vice President and Chief Operations and Engineering Officer of DuPont de Nemours Inc. from 2018 until 2025. From 2015 through 2018, he served as Vice President, Manufacturing, Technology and Regulatory Services and, from 2012 through 2015, as Senior Director, Manufacturing and Regulatory Services of Arkema S.A. From 1998 through 2012, he served in various manufacturing, health and safety, operations and engineering positions at Arkema S.A. Mr. Roberts is a director of American Electric Power (Nasdaq: AEP), an electric utility company. Mr. Roberts' qualifications to serve on the Board include his executive experience in the global manufacturing industry. He also brings to the Board relevant experience in engineering, manufacturing, operations, regulatory and health and safety. Through his roles in the manufacturing industry, he also has experience managing compliance, regulatory and public policy matters. Mr. Roberts has served as a director of AdvanSix since September 2025. | | | Board Committees: Audit; Health, Safety and Environmental |

  11. NOMINEES FOR ELECTION

    | Sharon S. Spurlin | | | | Ms. Spurlin (61) has been Senior Vice President and Treasurer of Plains All American Pipeline L.P., an energy infrastructure and logistics company, since 2014. She joined Plains All American Pipeline L.P. in 2002 as its director of Internal Audit. From 2007 until 2009, Ms. Spurlin served as Plains All American Pipeline L.P.’s Assistant Treasurer. From 2009 until 2014, she served as both PetroLogistics L.P. and PL Midstream’s Senior Vice President and Chief Financial Officer. Ms. Spurlin has also held various positions at American Ref-Fuel Company and Arthur Andersen. Ms. Spurlin is a director of Smart Sand Inc. (Nasdaq: SND), a supplier of industrial sand to the energy industry, and DMC Global (Nasdaq: BOOM), an owner and operator of asset-light manufacturing businesses that provide unique, highly engineered products and differentiated solutions. She brings to the Board her corporate governance and financial expertise, including in financial reporting, accounting, capital markets and controls, as well as senior leadership experience in operations/HS&E and sustainability, regulated industries, risk management, and public companies. Ms. Spurlin has served as a director of AdvanSix since the spin-off from Honeywell on October 1, 2016. | | | Board Committees: Audit; Compensation and Leadership Development |

  12. NOMINEES FOR ELECTION

    | Patrick S. Williams | | | | Mr. Williams (61) has served as President and CEO and as a director of Innospec Inc. (Nasdaq: IOSP), an international specialty chemicals company, since 2009. Prior to holding this position, Mr. Williams was Executive Vice President and President, Fuel Specialties from 2005 to 2009 and in addition assumed responsibility for the global Performance Chemicals business in 2008. Prior to 2005, he served as Chief Executive Officer for the Fuel Specialties business in the Americas, having held a number of senior management and sales leadership roles in that business since 1993. Mr. Williams brings to the Board senior leadership, business strategy, management oversight, and public company governance experience gained through his role as a President and Chief Executive Officer and board member of Innospec Inc., with extensive chemicals industry experience including mergers and acquisitions, operations/HS&E and sustainability, global business, and strategy development and growth. Mr. Williams has served as a director of AdvanSix since February 2020. | | | Board Committees: Compensation and Leadership Development; Nominating and Governance |

  13. NOMINEES FOR ELECTION

    The composition of certain Board Committees changed during 2025. See below on pages 8-9 under “Board Committees” for additional information.

  14. NOMINEES FOR ELECTION

    | 5 | Proxy and Notice of Annual Meeting of Stockholders | 2026 |

  15. NOMINEES FOR ELECTION

    CORPORATE GOVERNANCE AdvanSix is committed to strong corporate governance policies, practices and procedures designed to make the Board more effective in exercising its oversight role. The following sections provide an overview of our corporate governance structure, including the independence and other criteria we use in selecting director nominees, our Board leadership structure, and the responsibilities of the Board and each of its Committees. Our Corporate Governance Guidelines, among other key governance materials, help guide our Board and management in the performance of their duties and are regularly reviewed by the Board.

  16. NOMINEES FOR ELECTION

    | KEY CORPORATE GOVERNANCE DOCUMENTS Please visit our website at www.AdvanSix.com (see “Investors”—“Corporate Governance”) to view the following documents: | | •Certificate of Incorporation and By-laws | | •Corporate Governance Guidelines | | •Code of Business Conduct | | •Board of Directors Code of Ethics Guidelines | | •Committee Charters |

  17. NOMINEES FOR ELECTION

    These documents are available free of charge on our website or by writing to AdvanSix Inc., 300 Kimball Drive, Suite 101, Parsippany, New Jersey 07054, c/o Corporate Secretary. Our Code of Business Conduct (the "Code of Conduct") applies to all directors, officers (including the Chief Executive Officer, Chief Financial Officer and Controller) and employees, and our Board of Directors Code of Ethics Guidelines (the "Board Code of Ethics") applies to our directors. Amendments to, or waivers of, the Code of Conduct and the Board Code of Ethics granted to any of our directors or executive officers, as applicable, will be disclosed on our website.

  18. BOARD OF DIRECTORS

    BOARD OF DIRECTORS The primary functions of our Board of Directors are: •to oversee the affairs of the Company and management performance on behalf of stockholders; •to ensure that the long-term interests of the stockholders are being served; •to monitor adherence to AdvanSix standards and policies; •to promote the exercise of responsible corporate citizenship; and •to perform the duties and responsibilities applicable to the members of our Board under the laws of Delaware, AdvanSix’s state of incorporation.

  19. DIRECTOR COMPENSATION

    DIRECTOR COMPENSATION The C&LD Committee reviews and makes recommendations to the Board regarding the form and amount of compensation for non-employee directors. Directors who are employees of AdvanSix receive no compensation for service on the Board. AdvanSix’s director compensation program is designed to enable continued attraction and retention of highly qualified directors and is designed to account for the time, effort, expertise and accountability required for active Board membership. In general, the C&LD Committee and the Board believe that annual compensation for non-employee directors should consist of both a cash component, designed to compensate members for their service on the Board and its Committees, and an equity component, designed to align the interests of directors and stockholders and, by vesting over time, to create an incentive for continued service on the Board. The compensation program was approved by our Board upon the recommendation of our C&LD Committee, in consultation with its independent compensation consultant, who conducted a comprehensive review of peer group and market data in order to assess total director compensation, consisting of cash retainer fees and annual equity awards, and to align the elements of our director compensation program with our peer group, including the recommended mix of approximately half of total compensation in equity. Our independent compensation consultant was engaged to conduct a competitive review of our director compensation program for 2025 and determined that cash compensation was aligned with the median of the peer group, but was slightly below the median for the equity compensation component. Our consultant proposed adjustments for the C&LD Committee's consideration in order to align with the median for such annual equity grant. For 2025, upon the recommendation of our C&LD Committee, in consultation with its independent compensation consultant and based on a comprehensive review of peer group and market data, our Board approved an increase to the annual equity grant from $105,000 to $120,000. The 2016 Stock Incentive Plan of AdvanSix Inc. and its Affiliates, as Amended and Restated, or the 2016 Stock Incentive Plan, includes an annual limit of $750,000 on each director's total compensation, including both cash and equity components.

  20. DIRECTOR COMPENSATION—FISCAL YEAR 2025

    DIRECTOR COMPENSATION—FISCAL YEAR 2025

  21. DIRECTOR COMPENSATION—FISCAL YEAR 2025

    | Director Name | Fees Earned or Paid in Cash ($)(1) | Stock Awards ($)(2)(3) | All Other Compensation ($) | Total ($) | | Farha Aslam | $42,033 | $— | — | $42,033 | | Darrell K. Hughes | $42,033 | $— | — | $42,033 | | Todd D. Karran | $190,000 | $119,978 | — | $309,978 | | Gena C. Lovett, Ph.D. | $105,000 | $119,978 | — | $224,978 | | Donald Newman | $100,714 | $119,978 | — | $220,692 | | Dana O'Brien | $29,593 | $— | — | $29,593 | | Daryl Roberts | $29,593 | $— | — | $29,593 | | Daniel F. Sansone | $99,286 | $119,978 | — | $219,264 | | Sharon S. Spurlin | $105,000 | $119,978 | — | $224,978 | | Patrick Williams | $105,000 | $119,978 | — | $224,978 |

  22. DIRECTOR COMPENSATION—FISCAL YEAR 2025

    (1)Includes all fees earned in 2025, whether paid in cash or deferred under the DCP (including amounts held in the AdvanSix stock unit fund and any other investment option under the DCP). (2)The amounts set forth in this column represent the aggregate grant date fair value of stock awards computed in accordance with FASB ASC Topic 718. Stock awards of 5,020 RSUs were made to each non-employee director on June 18, 2025 with a value of $23.90 per share, which vest in full on June 18, 2026. A more detailed discussion of assumptions used in the valuation of stock awards made in fiscal year 2025 may be found in Note 14 of the Notes to Consolidated Financial Statements in the Company’s Form 10-K for the fiscal year ended December 31, 2025 ("2025 Form 10-K"). (3)The table below reflects each director's outstanding RSUs granted under our 2016 Stock Incentive Plan, all of which were unvested at December 31, 2025. All of our current directors, other than Mr. Bird, Dr. Lovett, Ms. O'Brien and Mr. Roberts, also hold amounts in the AdvanSix stock unit fund under the DCP.

  23. DIRECTOR COMPENSATION—FISCAL YEAR 2025

    | Director Name | Outstanding RSUs at 12/31/25 | | Farha Aslam | — | | Darrell K. Hughes | — | | Todd D. Karran | 5,020 | | Gena C. Lovett, Ph.D. | 5,020 | | Donald Newman | 5,020 | | Dana O'Brien | — | | Daryl Roberts | — | | Daniel F. Sansone | 5,020 | | Sharon S. Spurlin | 5,020 | | Patrick Williams | 5,020 |

  24. Our Executive Compensation Philosophy and Approach

    Our Executive Compensation Philosophy and Approach Our executive compensation and benefit programs are designed to support the creation of stockholder value through four key objectives: •attract and retain world-class leadership talent •drive performance that creates stockholder value •pay for superior results and sustainable performance •manage risk through oversight and sound management In setting total compensation to meet these key objectives, we seek to achieve the optimal balance between: (1) fixed and variable (or “at-risk”) pay elements; (2) short-term and long-term pay elements; and (3) cash and equity-based elements. The factors applicable to our NEOs that generally shape our assessment of compensation and help achieve our key objectives include: (1) compensation history, in total and for each element of compensation; (2) operational and financial performance of AdvanSix; (3) individual future leadership development and potential; (4) our performance relative to the competitive marketplace; (5) individual performance record; (6) relative level of responsibility within AdvanSix and the impact of the NEO’s position on Company performance; (7) trends and best practices in executive compensation; and (8) industry and macroeconomic conditions. We seek to establish annual and long-term incentive compensation program designs that are reflective of our pay-for-performance culture and adopt performance metrics under our short-term incentive compensation program and for our PSUs which are designed to align with the key elements of our strategy to grow stockholder value. For a discussion of certain of our C&LD Committee processes and procedures with respect to executive compensation, please see "Board Committee Oversight of Executive Compensation and Outside Compensation Consultant" on page 10.

  25. Key 2025 Compensation Program Elements

    | Compensation Element | Description | Objectives | | Base Salary | Fixed cash compensation; reviewed annually and subject to adjustment | Provide a fixed level of cash compensation to attract and retain our NEOs | | Short-Term Cash Incentive Compensation | Annual cash incentive compensation based on performance against annually established Company financial and operational performance goals, as well as strategic objectives | Reward and motivate our NEOs for achieving key short-term performance objectives and strategic priorities | | Long-Term Equity Incentive Compensation | Annual equity compensation awards of PSUs (with payout tied to achievement of Company financial and operational goals measured over a 3-year performance period, with an rTSR modifier) and time-based RSUs | Align NEO interests with those of our stockholders by rewarding the creation of long-term stockholder value and encouraging stock ownership; reward and motivate our NEOs for achieving key long-term performance objectives | | Health, Welfare and Retirement Benefits | Qualified and non-qualified retirement plans and health care and insurance benefits | Attract and retain NEOs by providing market-competitive benefits | | Severance and Change-in-Control Arrangements | Reasonable severance benefits provided upon covered terminations of employment, including following a change in control | Attract and retain high quality talent by providing market-competitive severance protection, thereby encouraging NEOs to direct their attention to stockholders’ interests notwithstanding the potential for loss of employment in connection with a change in control |

  26. Peer Group

    Peer Group The C&LD Committee believes it is important to understand the relevant market for executive talent to ensure that AdvanSix’s executive compensation program is competitive and supports the attraction and retention of highly qualified executives. The C&LD Committee also believes that market information is useful as one relevant factor in assessing the reasonableness of compensation paid to our executive officers. The C&LD Committee utilizes its independent compensation consultant to advise with respect to establishing its peer group of companies for use in connection with compensation benchmarking, review of market practices and relative performance evaluations. The following selection criteria were used in determining the peer group: size (revenues and market capitalization generally within the range of 0.34 - 6.5x AdvanSix’s revenue and market capitalization), industry (chemicals industry), operating complexity (focused on organizations with vertical integration), location/geographic reach (U.S. based organizations with global distribution) and availability of data (publicly traded companies). On a regular basis, at the C&LD Committee's direction, the independent compensation consultant evaluates the peer group and proposes modifications for the C&LD Committee's consideration to eliminate companies that were acquired or no longer meet the peer group selection criteria and to add new companies to ensure that we can continue to maintain a robust data set from the peer group. The peer group from January to June 2025 was as follows:

  27. Peer Group

    | American Vanguard | Innospec Inc. | Orion Engineered Carbons S.A. | Trinseo | | Cabot Corp. | Koppers Holdings, Inc. | Quaker Chemical Corp. | Tronox Holdings plc | | Hawkins Inc. | LSB Industries, Inc. | Sensient Technologies Corp. | | | H.B. Fuller | Mativ Holdings, Inc. | Stepan Co. | | | Ingevity Corp. | Minerals Technologies Inc. | Tredegar Corp. | |

  28. Peer Group

    In June 2025, upon the recommendation of the independent compensation consultant, the C&LD Committee approved the following changes to the peer group: (i) the removal of Trinseo, Mativ Holdings, Tredegar Corp and American Vanguard; and (ii) the addition of

  29. Peer Group

    | 26 | Proxy and Notice of Annual Meeting of Stockholders | 2026 |

  30. Peer Group

    Element Solutions Inc., Ashland Inc., Balchem Corporation and Ecovyst, Inc. As a result, the following represents the updated peer group effective June 2025:

  31. Peer Group

    | Ashland Inc. | Hawkins Inc. | LSB Industries, Inc. | Stepan Co. | | Balchem Corporation | H.B. Fuller | Minerals Technologies Inc. | Tronox Holdings plc | | Cabot Corp. | Ingevity Corp. | Orion Engineered Carbons S.A. | | | Ecovyst, Inc. | Innospec Inc. | Quaker Chemical Corp. | | | Element Solutions | Koppers Holdings, Inc. | Sensient Technologies Corp. | |

  32. Base Salary

    Base Salary Base salaries are intended to attract and compensate high-performing and experienced leaders and are determined based on scope of responsibility, years of experience and performance, with reference to market data (but are not targeted to a specific competitive position). On February 26, 2025, based on performance assessments and, in consultation with the independent compensation consultant, a review of peer group data for compensation benchmarking, the C&LD Committee determined the base salary for Ms. Kane, Mr. Manjeshwar, Mr. Kintiroglou and Ms. Slieter would not be increased for 2025. Prior to his appointment as Interim CFO on July 9, 2025, Mr. Gramm's base salary for 2025 was $340,000. While serving as Interim CFO, Mr. Gramm's base salary was increased by $15,000 per month for an annualized value of $520,000. In February 2026, based on performance assessments and, in consultation with the independent compensation consultant, the C&LD Committee approved the annual base salaries for the following executive officers, effective July 1, 2026, to better align with peer group data for competitive positioning.

  33. Short-Term Incentive Awards

    Short-Term Incentive Awards Short-term incentive awards are intended to motivate and reward executives for achieving annual corporate and individual goals in key areas of financial and operational performance. In February 2025, the C&LD Committee established the metrics for the short-term incentive plan for 2025 to ensure alignment with the Company’s business objectives and compensation philosophy while also taking into consideration a review of peer group data confirmed by its independent compensation consultant. Under the 2025 program, the performance metrics for employees at the level of vice president and above, including our NEOs, were unchanged from 2024, with the exception that (i) the FCF metric was removed and included as a performance metric for the long-term incentive program, and (ii) the weighting of the Adjusted EBITDA metric was increased to 80%. Under the plan established for 2025, our NEOs had the opportunity to earn a cash payment based on Company financial performance measured over the period from January 1, 2025 to December 31, 2025. The Company performance metrics for 2025 were based on the following metrics:

  34. Short-Term Incentive Awards

    | Performance Metrics(1) | Weighting | Definition | | Adjusted EBITDA(2) | 80% | Adjusted earnings before interest, taxes, depreciation and amortization | | Leadership Team Strategic Objectives(3) | 20% | Goals relating to business strategies, operational excellence, risk management and corporate social responsibility factors including environmental, social and governance priorities |

  35. Short-Term Incentive Awards

    (1) Adjusted EBITDA is a non-GAAP measure; See Appendix A for non-GAAP reconciliations. (2) Encourages focus on profitability and core operational performance by removing non-recurring items. (3) Encourages individuals to focus on their contributions to carrying out business strategy through operational excellence. For performance achievement at the target level (100% of the specified performance metric), each NEO would earn her or his target award opportunity, which is expressed as a specified percentage of her or his base salary. The target award opportunities for our NEOs for 2025 were: Ms. Kane, 100%; Mr. Gramm; 40%; Mr. Manjeshwar, 70%; Mr. Kintiroglou, 70%; and Ms. Slieter, 70%. These were unchanged from 2024.

  36. Short-Term Incentive Awards

    | 27 | Proxy and Notice of Annual Meeting of Stockholders | 2026 |

  37. Short-Term Incentive Awards

    For performance achievement below the threshold level, no payment is earned. For performance achievement at threshold levels, each NEO would earn the following threshold percentage of her or his target award opportunity: Adjusted EBITDA at 50%; and Strategic Objectives at 50%. For performance achievement at or above the maximum level, each NEO would earn a maximum amount of 200% of her or his target award opportunity. For performance achievement between threshold, target and maximum amounts, payout of awards will be interpolated. If actual performance falls below threshold for both performance metrics, no incentive awards will be paid. The performance metrics defined for our 2025 short-term incentive plan were:

  38. Short-Term Incentive Awards

    | Performance Metrics(1) | Threshold | Target | Maximum | | Adjusted EBITDA | $138 million | $179 million | $220 million | | Leadership Team Strategic Objectives | 50% achievement | 100% achievement | 200% achievement |

  39. Short-Term Incentive Awards

    Each NEO’s short-term incentive award was determined based on the following factors: base salary, target award opportunity and applicable performance metric percentage achievement. Based on results for 2025, our performance exceeded threshold levels for Adjusted EBITDA and Leadership Team Strategic Objectives, resulting in achievement at 77% of the target award opportunity.

  40. Short-Term Incentive Awards

    | Performance Metrics(1) | Weighting | Results | STI Achievement % | | Adjusted EBITDA | 80% | $157 million | 73% | | Leadership Team Strategic Objectives | 20% | 95% achievement | 95% | | | | | 77% |

  41. Short-Term Incentive Awards

    (1) Adjusted EBITDA is a non-GAAP measure; See Appendix A for non-GAAP reconciliations. Our performance for 2025 versus performance targets was impacted by our operational results as well as industry dynamics in our key commercial markets.

  42. Industry Pricing and Spreads

    | | Performance Achievementx | Target Award Opportunity | = | Actual 2025 Short-Term Incentive Plan Award | | Erin N. Kane | 77% | $1,020,000 | | $785,400 | | Christopher Gramm** | 77% | $250,000 | | $192,500 | | Siddharth Manjeshwar* | —% | $— | | $— | | Achilles B. Kintiroglou | 77% | $336,000 | | $258,720 | | Kelly Slieter | 77% | $301,000 | | $231,770 |

  43. Industry Pricing and Spreads

    *Effective as of July 9, 2025, Mr. Manjeshwar's employment was terminated and as a result no 2025 STI payment was made. **Mr. Gramm's STI was prorated to reflect his base salary rates in effect prior to and after his appointment as Interim Chief Financial Officer. Payments under the 2025 short-term incentive compensation program were made in the first quarter of 2026 following approval of performance results by the C&LD Committee. In February 2026, upon the recommendation of its independent compensation consultant, the C&LD Committee approved the 2026 short-term incentive compensation program which remained consistent with the 2025 program. The target award opportunities for our NEOs for 2026 were unchanged.

  44. Long-Term Incentive Compensation

    Long-Term Incentive Compensation

  45. 2025 Long-Term Incentive Awards

    2025 Long-Term Incentive Awards In February 2025, the C&LD Committee established our long-term incentive award program for 2025 to ensure alignment with the Company’s business objectives and compensation philosophy, while also taking into consideration a review of market practice confirmed by its independent compensation consultant. Our 2025 long-term incentive compensation program remained generally consistent with our 2024 program with the exception that (i) a cumulative FCF performance metric was added in addition to the existing EPS and ROI performance metrics, each of which is weighted equally at 33.3%, and (ii) the rTSR modifier was increased from plus/minus 10% to 20%, based on the same parameters in our 2024 program, as described below. The C&LD Committee determined to award long-term incentive awards in the form of:

  46. 2025 Long-Term Incentive Awards

    | | Terms | Weighting for NEOs | | Performance Stock Units (PSUs) | 3-year performance period | 50% | | Restricted Stock Units (RSUs) | Service-based vesting; ratable vesting over 3 years | 50% |

  47. 2025 Long-Term Incentive Awards

    The C&LD Committee believes strongly in using long-term incentive compensation to reinforce key Company objectives such as promoting the achievement of long-term performance goals, focusing on the significance of stockholder return, encouraging executive retention, and promoting executive stock ownership. In determining the overall opportunity and mix of long-term incentive awards, the C&LD Committee considers various factors, including competitive market positioning against comparable peer group executives, peer group long-term incentive award practices, potential economic value realized, and timing of vesting and related matters. The NEOs’ total target award values for their 2025 long-term incentive awards were as follows:

  48. 2025 Long-Term Incentive Awards

    | Name | 2025 LTI Award | 2024 LTI Award | % Change | | Erin N. Kane | $3,600,000 | $3,500,000 | 3% | | Christopher Gramm(1) | $471,000 | $295,000 | 60% | | Siddharth Manjeshwar(2) | $800,000 | $800,000 | —% | | Achilles B. Kintiroglou | $880,000 | $878,000 | —% | | Kelly Slieter | $670,000 | $630,000 | 6% |

  49. 2025 Long-Term Incentive Awards

    (1) Mr. Gramm's award includes a retention award ($250,000) issued when he was appointed as Vice President, Corporate Finance and Strategic Financial Planning and Analysis in February 2025. (2) Mr. Manjeshwar forfeited all of his LTI awards upon his termination on July 9, 2025. Increases to the LTI awards for Ms. Kane and Ms. Slieter were determined to be appropriate to remain market competitive, support retention, promote compensation tied to long-term objectives and stock price performance, and in recognition of their individual efforts towards advancing our short- and long-term strategy. Performance Stock Units. In February 2025, the C&LD Committee approved cumulative EPS, average three-year ROI and cumulative FCF, weighted 33.3% each, as the performance metrics for our 2025 PSU awards plus a modifier component based on rTSR. In choosing the relevant performance metrics for our PSU grants, the C&LD Committee considered: (i) with respect to cumulative EPS, this measure’s direct relationship to valuation and that EPS is a key driver of stockholder return; (ii) with respect to average three-year ROI, this measure's alignment with stockholder interests because AdvanSix is capital intensive and ROI has a high correlation to stockholder return; and (iii) with respect to cumulative FCF, this measure's alignment with stockholder interests supporting financial health, operational efficiency and available cash for discretionary expenditures. The C&LD Committee established the relevant metrics based on internal operating targets, industry growth cycles and expectations, as well as peer group data for compensation benchmarking. We do not disclose the specific, forward-looking EPS, ROI or FCF goals established for the PSU awards granted in 2025 because these goals relate to executive compensation to be earned and/or paid in future years and we believe that disclosure of such goals while the applicable performance period is ongoing would cause us competitive harm. However, we expect to disclose such goals in future proxy statements once the applicable performance period has ended as part of our discussion and analysis about the amounts earned by the NEOs under these awards. In setting the applicable target levels, the C&LD Committee considered how achievement of the performance goals could be impacted by events expected to occur in the coming years. We believe that the threshold goals have been established at levels that are challenging to attain and will promote execution of business strategies and drive stockholder value, and that the target goals will require considerable and increasing collective effort on the part of our employees, including our NEOs, to achieve. See the "Grants of Plan-Based Awards" table in this proxy statement for additional information regarding the PSU grants made to our NEOs in 2025. For performance achievement at the threshold, target and maximum levels, each NEO would earn 25%, 100% or 200% of her or his target award, respectively. For performance achievement between threshold, target and maximum amounts, the number of shares earned will be interpolated. If actual performance falls below threshold for both performance metrics, no shares are earned.

  50. 2025 Long-Term Incentive Awards

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  51. 2025 Long-Term Incentive Awards

    In addition, the program includes an rTSR modifier. Under the rTSR modifier, the number of shares earned based on our EPS, ROI and FCF performance will be: (i) increased by 20% if our TSR performance is above the 75th percentile relative to the S&P Small Cap 600 Materials Index, or (ii) decreased by 20% if our TSR performance is below the 25th percentile relative to the S&P Small Cap 600 Materials Index. The rTSR modifier has no impact for performance between the 26th and 74th percentiles relative to the selected comparator index. Restricted Stock Units. An RSU represents the right to receive one share of our Common Stock on set vesting dates subject to continued employment through such vesting dates. RSUs provide incentive to drive share price appreciation while encouraging retention. In February 2026, upon the recommendation of its independent compensation consultant, the C&LD Committee approved a long-term incentive program that remained consistent with the 2025 program with the exception that the comparator group for the rTSR modifier would be changed from the S&P Small Cap 600 Materials Index to the Company's proxy peer group given the stronger rTSR correlation based on historical analysis.

  52. 2023 PSU Awards - Performance Achievement and Vesting

    2023 PSU Awards - Performance Achievement and Vesting In February 2026, the Committee approved payout of our PSU awards granted in February 2023. Actual performance achievement with respect to each of the performance metrics is set forth below:

  53. 2023 PSU Awards - Performance Achievement and Vesting

    | Measure | 2023 | 2024 | 2025 | Cumulative EPS / Average ROI | | EPS | $2.14 | $1.96 | $2.28 | $6.38 | | ROI | 7.4% | 6.7% | 6.9% | 7.0% |

  54. 2023 PSU Awards - Performance Achievement and Vesting

    This performance resulted in payout percentages as follows:

  55. 2023 PSU Awards - Performance Achievement and Vesting

    | Measure | Weighting | Threshold | Target | Maximum | Performance Achievement | Payout % | | EPS | 50% | $16.38 | $19.03 | $21.74 | $6.38 | —% | | ROI | 50% | 17.0% | 19.7% | 25.5% | 7.0% | —% | | Total Payout %: | | | | | | —% |

  56. 2023 PSU Awards - Performance Achievement and Vesting

    Both metrics did not achieve threshold performance during the performance period based on the targets set in early 2023. This outcome reflects the impact of prevailing economic conditions and dynamic market conditions for our business lines. AdvanSix operates in a cyclical business environment, which has resulted in challenges with setting forward-looking three-year targets for performance metrics, which are particularly difficult to predict under fluctuating market conditions. Our NEOs did not earn any shares upon vesting of the 2023 PSU awards.

  57. Severance Benefits

    Severance Benefits In November 2017, our C&LD Committee adopted the AdvanSix Inc. Executive Severance Pay Plan (“Severance Plan”) for executive officers. The purpose of the Severance Plan is to provide financial protection upon loss of employment at market competitive rates. The severance terms for the NEOs were established in connection with peer group market practices and data provided by the compensation consultant. We believe these arrangements are necessary to attract and retain our executives and ensure continuity of management. The Severance Plan provides participants with certain severance benefits in the event of a covered termination, which includes: (i) an involuntary termination of employment by the Company, subject to certain exceptions enumerated in the Severance Plan; and (ii) voluntary termination of employment by a participant for Good Reason, as defined in the Severance Plan. In the event of a covered termination occurring outside of the Change in Control Period, which is the twenty-four month period following the occurrence of a Change in Control, as defined in the Severance Plan, each participant would be entitled to receive a lump sum cash payment in an amount equal to: •For our CEO: 2x the sum of her base salary plus prior year’s target bonus. •For each other participant: 1x the sum of her or his base salary plus prior year’s target bonus.

  58. Severance Benefits

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  59. Severance Benefits

    In the event of a covered termination occurring during the Change in Control Period, each participant would be entitled to receive: •For our CEO: (i) a lump-sum cash payment in an amount equal to 3x the sum of her base salary plus target bonus; and (ii) in the event that she is eligible to elect insurance continuation coverage under COBRA, a lump-sum cash payment in an amount equal to the estimated aggregate cost that the Company would have incurred, less expected participant contributions, to subsidize continuation of her COBRA coverage for 36 months. •For each other participant: (i) a lump-sum cash payment in an amount equal to 2x the sum of her or his base salary plus target bonus; and (ii) in the event that he or she is eligible to elect insurance continuation coverage under COBRA, a lump-sum cash payment in an amount equal to the estimated aggregate cost that the Company would have incurred, less expected participant contributions, to subsidize continuation of her or his COBRA coverage for 24 months. A participant’s right to receive benefits under the Severance Plan is conditioned on, among other things, the participant timely executing and not revoking an effective release of claims against the Company, its officers, directors and employees and the participant’s agreement to abide by certain restrictive covenants, in the C&LD Committee’s discretion. The Severance Plan also reserves the right of the C&LD Committee to cancel benefits under the Severance Plan in the event a participant engages in any activity that is considered detrimental to the Company’s interests. Each participant is solely responsible for any tax liabilities incurred by him or her in connection with the Severance Plan. In the event that a participant would be subject to the excise tax imposed by Section 4999 of the Code, the Severance Plan includes a “net best” provision whereby a participant would be entitled to the greater after-tax benefit of either: (i) her or his full severance benefits, for which the participant is responsible for the payment of any applicable Section 4999 excise tax; or (ii) her or his severance benefits reduced to the maximum amount that would result in no Section 4999 excise tax for the participant. The C&LD Committee may amend or terminate the Severance Plan at any time in accordance with its terms, provided that during the Change in Control Period and during a specified period prior to a Change in Control, the Severance Plan may not be amended or terminated in any manner adverse to the interests of the participants. The compensation that could be received by our NEOs in connection with various termination scenarios occurring on December 31, 2025 is set forth below in the section entitled “Potential Payments Upon Termination or Change in Control.” Information regarding the cash severance payments to which Mr. Manjeshwar became entitled to in connection with his July 2025 termination of employment is set forth below in the Summary Compensation Table.

  60. Retirement Plans and Nonqualified Deferred Compensation Plan

    Retirement Plans and Nonqualified Deferred Compensation Plan In connection with the spin-off, we were required to adopt a qualified defined benefit retirement plan with terms materially consistent with the terms of Honeywell’s Retirement Earnings Plan (“Honeywell REP”). In October 2016, our Board adopted the AdvanSix Inc. Retirement Earnings Plan (“ASIX REP”). The only participants in the ASIX REP are those Company employees who were active participants in the Honeywell REP. Of our NEOs, only Ms. Kane and Mr. Gramm participate in the ASIX REP. Participants earn a benefit under a formula substantially identical to the formula which applied to participants under the Honeywell REP, except that any benefit earned under the ASIX REP will be reduced by the value of benefits accrued through the spin-off date under the Honeywell REP, which remain the responsibility of Honeywell. The material terms of the ASIX REP are explained below under “Pension Benefits - Fiscal Year 2025.” We have also adopted a broad-based defined contribution plan, or 401(k) plan. The AdvanSix Inc. Savings Plan (“Savings Plan”) allows eligible employees to contribute a portion of their cash compensation to save for their future retirement needs. The Company matches 50-75% of the first 8% of contribution elections for employees covered by a collective bargaining agreement, with the match amount dependent on the specific terms of the applicable collective bargaining agreement. The Company matches 75% of the first 8% of the employee's contributions for all other employees. The Company may also provide an additional discretionary retirement savings contribution which is at the sole discretion of the Company. Matching contributions vest after three years of service. The Company has also adopted the AdvanSix Inc. Deferred Compensation Plan (the "DCP"), effective January 1, 2018. The DCP is a non-qualified deferred compensation plan under which designated eligible executives, including our NEOs, and directors of the Company may elect to defer annual base salary, bonuses or director’s fees, as applicable. The DCP also permits the Company to make contributions to the accounts of employee participants. Under the DCP, employee participants may elect to defer up to a maximum of 75% of base salary and 90% of bonuses. Participants designate the funds in which their account balances will be deemed to be invested for purposes of determining the amount of earnings and losses to be credited to their accounts. The rate of return earned on a participant’s account balance is based on the actual performance of the funds in which he or she is deemed invested. All amounts credited under the DCP, with the exception of any contributions which may be made by the Company, are immediately vested. The material terms of the DCP are explained below under “Nonqualified Deferred Compensation - Fiscal Year 2025.”

  61. 2025 SUMMARY COMPENSATION TABLE

    2025 SUMMARY COMPENSATION TABLE The following tables provide information concerning compensation paid to our NEOs for fiscal year 2025.

  62. 2025 SUMMARY COMPENSATION TABLE

    | Named Executive Officer and Principal Position | Year | Salary ($)(1) | Stock Awards ($)(2) | Option Awards ($)(3) | Non-Equity Incentive Plan Compensation ($)(4) | Change in Pension Value and Non-qualified Deferred Compensation Earnings ($)(5) | All Other Compensation ($)(6) | Total Compensation ($) | | Erin N. Kane, President and Chief Executive Officer | 2025 | $1,019,700 | $3,747,900 | $— | $785,400 | $18,904 | $75,534 | $5,647,438 | | | 2024 | $1,019,700 | $3,540,936 | $— | $938,124 | $22,098 | $69,177 | $5,590,035 | | | 2023 | $1,012,846 | $2,457,416 | $799,984 | $326,304 | $53,931 | $68,015 | $4,718,496 | | Christopher Gramm, Interim Chief Financial Officer | 2025 | $418,419 | $480,107 | $— | $192,500 | $16,519 | $27,957 | $1,135,503 | | | 2024 | $319,201 | $298,446 | $— | $118,261 | $21,730 | $22,147 | $779,785 | | | 2023 | $312,001 | $226,542 | $73,748 | $39,936 | $41,836 | $31,964 | $726,027 | | Siddharth Manjeshwar, Former Senior Vice President and Chief Financial Officer | 2025 | $288,750 | $832,869 | $— | $— | $— | $604,546 | $1,726,165 | | | 2024 | $119,135 | $799,984 | $— | $84,525 | $— | $11,000 | $1,014,643 | | Achilles B. Kintiroglou, Senior Vice President, General Counsel, Corporate Secretary | 2025 | $480,000 | $916,160 | $— | $258,720 | $— | $37,152 | $1,692,032 | | | 2024 | $474,231 | $888,279 | $— | $309,120 | $— | $25,245 | $1,696,874 | | | 2023 | $449,231 | $518,306 | $168,746 | $87,360 | $— | $28,282 | $1,251,925 | | Kelly Slieter, Senior Vice President, Chief Human Resources Officer | 2025 | $430,000 | $697,548 | $— | $231,770 | $— | $34,152 | $1,393,470 | | | 2024 | $423,077 | $637,360 | $— | $276,920 | $— | $33,379 | $1,370,736 | | | 2023 | $391,923 | $372,382 | $121,247 | $76,800 | $— | $36,760 | $999,112 |

  63. 2025 SUMMARY COMPENSATION TABLE

    (1)Amounts in this column reflect base salary paid to our NEOs in 2025, 2024 and 2023. Mr. Manjeshwar joined the Company effective October 1, 2024 and was not an NEO in 2023. Effective as of July 9, 2025, Mr. Manjeshwar's employment was terminated. (2)Amounts in this column for 2025 reflect the RSU awards and the PSU awards granted to our NEOs under our 2025 long-term incentive award program. The aggregate grant date fair value of RSUs and PSUs was computed in accordance with FASB ASC Topic 718. The grant date fair value of the RSUs granted to our NEOs in February 2025 under our long-term incentive program was $27.75 per share, calculated using the high and low sales price of a share of our stock on the grant date. The grant date fair value of each PSU, taking into account the estimated probable outcome of the performance conditions, including using a Monte Carlo simulation model with reference to the grant date for the market-based condition (rTSR modifier) and using the closing price of a share of our stock on the grant date, was $30.03. A discussion of assumptions used in the valuation of RSU and PSU awards made in fiscal year 2025 may be found in Note 14 to the Notes to the Financial Statements in our 2025 Form 10-K. The grant date fair value of RSU awards granted in 2025 is as follows: Ms. Kane, $1,800,004; Mr. Manjeshwar, $400,016; Mr. Kintiroglou, $440,004; Ms. Slieter, $335,026; and Mr. Gramm $360,528. The grant date fair value of PSU awards granted in 2025 is reflected in the table at target as follows: Ms. Kane, $1,947,896; Mr. Manjeshwar $432,852; Mr. Kintiroglou, $476,156; Ms. Slieter, $362,522; and Mr. Gramm, $119,579. The grant date fair value of the 2025 PSU awards assuming maximum performance achievement is as follows: Ms. Kane, $3,895,792; Mr. Manjeshwar, $865,705; Mr. Kintiroglou, $952,311; Ms. Slieter, $725,044; and Mr. Gramm, $239,159. Mr. Manjeshwar forfeited his 2025 RSU and PSU awards upon his July 9, 2025 termination of employment. (3)Amounts in this column reflect stock options granted to our named executive officers under our long-term incentive award program. Amounts reflect the aggregate grant date fair value of stock option awards computed in accordance with FASB ASC Topic 718, using the Black-Scholes option-pricing model at the time of grant. A discussion of the assumptions used in the valuation of option awards may be found in Note 14 to the Notes to the Financial Statements in our 2025 Form 10-K. (4)Amounts in this column for 2025 reflect payouts under our 2025 short-term incentive program paid in March 2026. See above in the Compensation Discussion and Analysis under “Details on Program Elements and Related 2025 Compensation Decisions-Short-Term Incentive Awards” for additional information.

  64. 2025 SUMMARY COMPENSATION TABLE

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  65. 2025 SUMMARY COMPENSATION TABLE

    (5)This column is required to present the aggregate change in the present value of the accumulated benefit under the ASIX REP from December 31, 2024 to December 31, 2025 of each of our NEOs who participates in the ASIX REP, namely Ms. Kane and Mr. Gramm (see the "Pension Benefits—Fiscal Year 2025" table of this proxy statement for additional information). The overall benefit as of December 31, 2025 is higher than the Honeywell qualified plan offset expressed as an annuity which is fixed at 2016 levels. (6)For 2025, All Other Compensation consists of the following items:

  66. 2025 SUMMARY COMPENSATION TABLE

    | Item | Ms. Kane | Mr. Gramm | Mr. Manjeshwar | Mr. Kintiroglou | Ms. Slieter | | Matching Contributions 401K | $17,625 | $18,723 | $10,071 | $17,088 | $19,210 | | Excess Liability Insurance | $2,852 | $2,852 | $2,852 | $2,852 | $2,852 | | Matching Contributions DCP | $43,557 | $6,382 | $— | $11,712 | $6,590 | | Executive Health Exam | $11,500 | $— | $— | $5,500 | $5,500 | | Severance Payment | $— | $— | $591,623 | $— | $— | | Total | $75,534 | $27,957 | $604,546 | $37,152 | $34,152 |

  67. GRANTS OF PLAN-BASED AWARDS—FISCAL YEAR 2025

    GRANTS OF PLAN-BASED AWARDS—FISCAL YEAR 2025

  68. GRANTS OF PLAN-BASED AWARDS—FISCAL YEAR 2025

    | | | | | Estimated Future Payouts Under Non-Equity Incentive Plan Awards (3) | | | Estimated Future Payouts Under Equity Incentive Plan Awards (4) | | | All Other Stock Awards: Number of Shares of Stock or Units | Grant Date Fair Value of Stock and Option Awards ($) | | Named Executive Officer | Award | Grant | Date of | Threshold | Target | Maximum | Threshold | Target | Maximum | | | | | Type (1) | Date | Action (2) | ($) | ($) | ($) | (#) | (#) | (#) | (#) | | | Erin N. Kane | STI | 2/28/2025 | 2/28/2025 | 305,910 | 1,019,700 | 2,039,400 | — | — | — | — | $— | | | PSU | 2/28/2025 | 2/28/2025 | — | — | — | 16,216 | 64,865 | 129,730 | — | $1,947,896 | | | RSU | 2/28/2025 | 2/28/2025 | — | — | — | — | — | — | 64,865 | $1,800,004 | | Christopher Gramm | STI | 2/28/2025 | 2/28/2025 | 38,563 | 208,000 | 416,000 | — | — | — | — | $— | | | PSU | 2/28/2025 | 2/28/2025 | — | — | — | 996 | 3,982 | 7,964 | — | $119,579 | | | RSU | 2/28/2025 | 2/28/2025 | — | — | — | — | — | — | 3,982 | $110,501 | | | RSU | 2/28/2025 | 2/28/2025 | | | | | | | 9,010 | $250,028 | | Siddharth Manjeshwar | STI | 2/28/2025 | 2/28/2025 | 110,250 | 367,500 | 735,000 | — | — | — | — | $— | | | PSU | 2/28/2025 | 2/28/2025 | — | — | — | 3,604 | 14,414 | 28,828 | — | $432,852 | | | RSU | 2/28/2025 | 2/28/2025 | — | — | — | — | — | — | 14,415 | $400,016 | | Achilles Kintiroglou | STI | 2/28/2025 | 2/28/2025 | 100,800 | 336,000 | 672,000 | — | — | — | — | $— | | | PSU | 2/28/2025 | 2/28/2025 | — | — | — | 3,964 | 15,856 | 31,712 | — | $476,156 | | | RSU | 2/28/2025 | 2/28/2025 | — | — | — | — | — | — | 15,856 | $440,004 | | Kelly Slieter | STI | 2/28/2025 | 2/28/2025 | 90,300 | 301,000 | 602,000 | — | — | — | — | $— | | | PSU | 2/28/2025 | 2/28/2025 | — | — | — | 3,018 | 12,072 | 24,144 | — | $362,522 | | | RSU | 2/28/2025 | 2/28/2025 | — | — | — | — | — | — | 12,073 | $335,026 |

  69. GRANTS OF PLAN-BASED AWARDS—FISCAL YEAR 2025

    (1)Award Type: RSU = restricted stock unit subject to service-based vesting conditions PSU = restricted stock unit subject to performance-based vesting conditions (grant date fair value presented at target) STI = annual cash incentive award under our short-term incentive compensation program (2)At a meeting held on February 28, 2025, the C&LD Committee took action to grant the 2025 long-term incentive awards effective on February 28, 2025. (3)Represents our NEOs’ potential threshold, target and maximum award opportunities under our short-term cash incentive program for 2025 performance. The amount reported for threshold assumes achievement of threshold performance with respect to each of the metrics under the 2025 plan (Adjusted EBITDA, Free Cash Flow and Leadership Team Strategic Objectives). Amounts actually paid for 2025 are reported in the Non-Equity Incentive Plan Compensation column of the Summary Compensation Table above. (4)Represents the potential threshold, target and maximum number of shares that our NEOs may earn with respect to 2025 PSU grants under our 2025 long-term incentive program for the performance period commencing January 1, 2025 and ending December 31, 2027. The amount reported for threshold assumes achievement of threshold performance with respect to each of the applicable performance metrics (Cumulative EPS and Average ROI). The number of shares earned pursuant to these awards, if any, will be determined and paid following completion of the three-year performance period based on our actual performance against the pre-established performance metrics. The number of shares earned may potentially be increased or decreased by 10% depending on our rTSR performance under the performance modifier component of these awards.

  70. GRANTS OF PLAN-BASED AWARDS—FISCAL YEAR 2025

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  71. OUTSTANDING EQUITY AWARDS AT 2025 FISCAL YEAR-END

    OUTSTANDING EQUITY AWARDS AT 2025 FISCAL YEAR-END

  72. OUTSTANDING EQUITY AWARDS AT 2025 FISCAL YEAR-END

    | | Option Awards | | | | | Stock Awards | | | | | Named Executive Officer | Grant Date | Number of Securities Underlying Unexercised Options (#) Exercisable | Number of Securities Underlying Unexercised Options (#) Unexercisable | Option Exercise Price ($) | Option Expiration Date | Number of Shares or Units of Stock That Have Not Vested (#) | Market Value of Shares or Units of Stock That Have Not Vested ($)(1) | Equity Incentive Plan Awards: Number of Unearned Shares, Units or Other Rights That Have Not Vested (#) | Equity Incentive Plan Awards: Market or Payout Value of Unearned Shares, Units or Other Rights That Have Not Vested ($)(1) | | Erin N. Kane | 2/28/2025 | — | —(2) | — | — | 64,865(3) | $1,122,165 | 64,865(4) | $1,122,165 | | | 2/28/2024 | — | —(2) | — | — | 42,641(3) | $737,689 | 63,962(4) | $1,106,543 | | | 2/28/2023 | 29,563 | 14,782(2) | $41.20 | 2/28/2033 | 19,417(3) | $335,914 | —(4) | $— | | | 2/28/2022 | 57,102 | —(2) | $39.15 | 2/28/2032 | — | — | — | — | | | 2/24/2021 | 72,532 | —(2) | $29.21 | 2/24/2031 | — | — | — | — | | | 2/26/2020 | 139,241 | —(2) | $14.29 | 2/26/2030 | — | — | — | — | | | 2/27/2019 | 56,400 | —(2) | $33.34 | 2/27/2029 | — | — | — | — | | | 3/2/2018 | 40,032 | —(2) | $41.97 | 3/2/2028 | — | — | — | — | | | 3/8/2017 | 53,688 | —(2) | $26.66 | 3/8/2027 | — | — | — | — | | Christopher Gramm | 2/28/2025 | — | —(2) | $0.00 | — | 3,982(3) | $68,889 | 3,982(4) | $68,889 | | | 2/28/2025 | — | —(2) | $0.00 | — | 9,010(3) | $155,873 | —(4) | $— | | | 2/28/2024 | — | —(2) | $0.00 | — | 3,594(3) | $62,176 | 5,391(4) | $93,264 | | | 2/28/2023 | 2,725 | 1,363(2) | $41.20 | 2/28/2033 | 1,790(3) | $30,967 | —(4) | $— | | | 2/28/2022 | 5,264 | —(2) | $39.15 | 2/28/2032 | — | — | — | — | | | 2/24/2021 | 7,133 | —(2) | $29.21 | 2/24/2031 | — | — | — | — | | | 2/26/2020 | — | —(2) | $14.29 | 2/26/2030 | — | — | — | — | | | 2/27/2019 | 9,019 | —(2) | $33.34 | 2/27/2029 | — | — | — | — | | | 3/2/2018 | 6,406 | —(2) | $41.97 | 3/2/2028 | — | — | — | — | | | 3/8/2017 | 8,590 | —(2) | $26.66 | 3/8/2027 | — | — | — | — | | Siddharth Manjeshwar (5) | — | — | — | $— | — | — | $— | — | $— | | Achilles B. Kintiroglou | 2/28/2025 | — | —(2) | $0.00 | — | 15,856(3) | $274,309 | 15,856(4) | $274,309 | | | 2/28/2024 | — | —(2) | $0.00 | — | 10,698(3) | $185,075 | 16,045(4) | $277,579 | | | 2/28/2023 | 6,236 | 3,118(2) | $41.20 | 2/28/2033 | 4,095(3) | $70,844 | —(4) | $— | | | 2/28/2022 | 9,814 | —(2) | $39.15 | 2/28/2032 | | | | | | | 2/24/2021 | 10,276 | —(2) | $29.21 | 2/24/2031 | | | | | | | 2/26/2020 | 22,416 | —(2) | $14.29 | 2/26/2030 | | | | | | | 2/27/2019 | 2,440 | —(2) | $33.34 | 2/27/2029 | | | | | | | 3/2/2018 | 1,895 | —(2) | $41.97 | 3/2/2028 | | | | | | | 3/8/2017 | 2,530 | —(2) | $26.66 | 3/8/2027 | | | | | | Kelly Slieter | 2/28/2025 | — | —(2) | $0.00 | — | 12,073(3) | $208,863 | 12,072(4) | $208,846 | | | 2/28/2024 | — | —(2) | $0.00 | — | 7,676(3) | $132,795 | 11,513(4) | $199,175 | | | 2/28/2023 | 4,480 | 2,241(2) | $41.20 | 2/28/2033 | 2,942(3) | $50,897 | —(4) | $— | | | 2/28/2022 | 6,245 | —(2) | $39.15 | 2/28/2032 | | | | | | | 2/24/2021 | 8,100 | —(2) | $29.21 | 2/24/2031 | | | | |

  73. OUTSTANDING EQUITY AWARDS AT 2025 FISCAL YEAR-END

    (1)Calculated using the closing market price of our Common Stock on December 31, 2025 ($17.30). (2)Options scheduled to vest in three equal annual installments on the first three anniversaries of the grant date. (3)RSUs scheduled to vest in three equal annual installments on the first three anniversaries of the grant date, except for the following: all RSUs granted on February 28, 2023 and the retention grant of 9,010 RSUs to Mr. Gramm on February 28, 2025. (4)PSUs scheduled to vest following the conclusion of a three-year performance period based on actual performance achievement measured against the pre-established performance metrics. The performance period for the 2023 PSU awards ended on December 31, 2025 and for the 2024 and 2025 PSU awards will end on December 31, 2026 and December 31, 2027, respectively. In February 2026, the Committee determined that the 2023 PSU awards did not achieve threshold performance and resulted in no payout. For the 2024 and 2025 PSU awards, represents the target number of shares. (5)Mr. Manjeshwar forfeited all of his LTI awards upon his termination on July 9, 2025.

  74. OUTSTANDING EQUITY AWARDS AT 2025 FISCAL YEAR-END

    | 37 | Proxy and Notice of Annual Meeting of Stockholders | 2026 |

  75. OPTION EXERCISES AND STOCK VESTED—FISCAL YEAR 2025

    OPTION EXERCISES AND STOCK VESTED—FISCAL YEAR 2025 The following table provides additional information about the value realized by our NEOs upon exercises of option awards and vesting of stock awards during the fiscal year ended December 31, 2025.

  76. OPTION EXERCISES AND STOCK VESTED—FISCAL YEAR 2025

    | | Option Awards | | | Stock Awards | | | | Named Executive Officer | Number of Shares Acquired on Exercise (#) | Value Realized on Exercise ($) | | Number of Shares Acquired on Vesting (#) | Value Realized on Vesting ($) | | | Erin N. Kane | — | | — | 43,424 | | 1,204,799 | | Christopher Gramm | — | | — | 3,832 | | 106,319 | | Siddharth Manjeshwar | — | | — | — | | — | | Achilles B. Kintiroglou | — | | — | 9,188 | | 254,921 | | Kelly Slieter | — | | — | 6,291 | | 174,544 |

  77. PENSION BENEFITS—FISCAL YEAR 2025

    PENSION BENEFITS—FISCAL YEAR 2025 The following table provides summary information about the pension benefits that have been earned by our NEOs under the ASIX REP. The ASIX REP is a tax-qualified defined benefit pension plan in which a portion of AdvanSix U.S. employees participate and which, as a broad-based pension plan, is subject to tax requirements that impose dollar limitations on the benefits that can be provided.

  78. PENSION BENEFITS—FISCAL YEAR 2025

    | Named Executive Officer | Plan Name | Number of Years of Credited Service (#) | Present Value of Accumulated Benefits ($) (1) | | Erin N. Kane | ASIX REP | 23.1 | $94,934 | | Christopher Gramm | ASIX REP | 29.0 | $80,085 |

  79. PENSION BENEFITS—FISCAL YEAR 2025

    (1) See Note 10 “Postretirement Benefit Obligations” to our consolidated financial statements in our 2025 Form 10-K for a discussion of our assumptions used in determining the present value of the accumulated pension benefits.

  80. NON-QUALIFIED DEFERRED COMPENSATION—FISCAL YEAR 2025

    NON-QUALIFIED DEFERRED COMPENSATION—FISCAL YEAR 2025 The AdvanSix Inc. Deferred Compensation Plan (“DCP”), adopted effective January 1, 2018, is a nonqualified deferred compensation plan under which designated eligible executive officers, including our named executive officers, and directors of the Company may elect to defer annual base salary, bonuses or director’s fees, as applicable. Under the DCP, employee participants may elect to defer up to a maximum of 75% of base salary and 90% of bonuses. Participants designate the funds (in any combination of the funds offered as investment options under the DCP) in which their account balances will be deemed to be invested for purposes of determining the amount of earnings and losses to be credited to their accounts. The DCP includes a Company stock unit fund which is only available to non-employee director participants. The DCP also permits the Company to make contributions to the accounts of employee participants. For 2025, Company contributions represent makeup plan contributions under the DCP. These makeup contributions are calculated as follows: (i) the maximum Company contribution that would have been provided under our tax-qualified Savings Plan if the deferrals made under the DCP had been made under the Savings Plan (disregarding the compensation limit determined under the Code that applies under the Savings Plan), minus (ii) the amount of Company contributions actually credited to the employee participant under the Savings Plan for the applicable year and not thereafter forfeited. The rate of return earned on a participant’s account balance is based on the actual performance of the funds in which he or she is deemed invested, and the participant may change her or his choice of funds at any time. All amounts credited under the DCP, with the exception of any contributions which may be made by the Company, are immediately vested. Upon a participant's death or a change in control, unvested amounts vest in full. Participants cannot sell, assign, hypothecate, alienate, encumber or in any way transfer or convey in advance of receipt any amounts held in their DCP accounts. Under the DCP, each participant’s account will be payable in lump sum or installments upon a scheduled distribution date or the participant’s separation from service or death in accordance with the participant’s elections, the terms of the DCP and subject to Section 409A of the Code. Participants may receive a distribution earlier than initially elected in the event of a financial hardship. Participants may also elect to receive distributions of their accounts in a lump sum upon a change in control. Distributions to employee participants will be made solely in cash. The Board may amend or terminate the DCP at any time in accordance with the terms of the DCP. The deferred compensation obligations under the DCP are unsecured general obligations of the Company to pay the deferred compensation of participants in the DCP. The deferred compensation obligations under the DCP will rank equally with the Company’s other unsecured and unsubordinated indebtedness from time to time outstanding. The following table reflects contributions under the DCP made by our NEOs and AdvanSix for the fiscal year ended December 31, 2025, earnings (the net of the gains and losses on funds, as applicable), distributions, and the ending balance as of December 31, 2025.

  81. NON-QUALIFIED DEFERRED COMPENSATION—FISCAL YEAR 2025

    | Named Executive Officer | Executive Contributions for 2025 | Registrant Contributions for 2025 (1) | Aggregate Earnings/(Losses) in 2025 | Aggregate Withdrawals/ Distributions | Aggregate Balance at 12/31/25 (2) | | Erin N. Kane | $81,576 | $43,557 | $290,192 | $(145,790) | $1,847,369 | | Christopher Gramm | $37,934 | $6,382 | $44,063 | $— | $348,625 | | Siddharth Manjeshwar | $— | $— | $— | $— | $— | | Achilles B. Kintiroglou | $14,400 | $11,712 | $1,532 | $— | $15,932 | | Kelly Slieter | $25,800 | $6,590 | $16,746 | $— | $164,851 |

  82. NON-QUALIFIED DEFERRED COMPENSATION—FISCAL YEAR 2025

    (1)Amounts reflect Company matching contributions earned for 2025 and credited in 2026. Company matching contributions apply to salary deferrals. (2)Salary and annual incentive compensation deferred under the DCP, as well as Registrant Contributions, are reported as compensation in the Summary Compensation Table for the respective year in which the salary or annual incentive compensation was paid or earned. The Aggregate Balance at 12/31/25 does not include the following registrant contributions earned in 2025 but paid in 2026, which are reported in the "Registrant Contributions for 2025" column: Ms. Kane, $43,557, Mr. Kintiroglou $11,712, Ms. Slieter, $6,590 and Mr. Gramm, $6,382.

  83. NON-QUALIFIED DEFERRED COMPENSATION—FISCAL YEAR 2025

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  84. POTENTIAL PAYMENTS UPON TERMINATION OR CHANGE IN CONTROL

    POTENTIAL PAYMENTS UPON TERMINATION OR CHANGE IN CONTROL The following table summarizes estimated payments and benefits to which our NEOs would be entitled upon the hypothetical occurrence of various termination scenarios or a change in control. The information in the table below is based on the assumption, in each case, that the termination of employment occurred on December 31, 2025. Pension and non-qualified deferred compensation benefits, which are described elsewhere in this proxy statement, are not included in the table below in accordance with the applicable proxy statement disclosure requirements, even though they may become payable at the times specified in the table.

  85. POTENTIAL PAYMENTS UPON TERMINATION OR CHANGE IN CONTROL

    | Payments and Benefits | Named Executive Officer | Termination by the Company Without Cause or by the NEO for Good Reason | Death | Disability | Change in Control—No Termination of Employment | Change in Control— Termination of Employment by Company, Without Cause, or by NEO for Good Reason within 24 months after Change in Control | | Cash Severance (Base Salary + Bonus) | Erin N. Kane | $3,059,100(1) | $— | $— | $— | $4,078,800(1) | | | Christopher Gramm | $728,000(1) | $— | $— | $— | $1,248,000(1) | | | Achilles B. Kintiroglou | $816,000(1) | $— | $— | $— | $1,296,000(1) | | | Kelly Slieter | $731,000(1) | $— | $— | $— | $1,161,000(1) | | Short-Term Incentive Compensation (Year of Termination) | Erin N. Kane | $— | $785,400(2) | $785,400(2) | $— | $1,019,700(2) | | | Christopher Gramm | $— | $192,500(2) | $192,500(2) | $— | $208,000(2) | | | Achilles B. Kintiroglou | $— | $258,720(2) | $258,720(2) | $— | $336,000(2) | | | Kelly Slieter | $— | $231,770(2) | $231,770(2) | $— | $301,000(2) | | COBRA Payment | Erin N. Kane | $— | $— | $— | $— | $—(3) | | | Christopher Gramm | $— | $— | $— | $— | $44,207(3) | | | Achilles B. Kintiroglou | $— | $— | $— | $— | $44,207(3) | | | Kelly Slieter | $— | $— | $— | $— | $44,207(3) | | Outstanding Equity Awards | Erin N. Kane | $— | $3,563,241(4) | $3,563,241(4) | $— | $4,680,198(4) | | | Christopher Gramm | $— | $426,618(4) | $426,618(4) | $— | $503,632(4) | | | Achilles B. Kintiroglou | $— | $860,658(4) | $860,658(4) | $— | $1,136,056(4) | | | Kelly Slieter | $— | $633,722(4) | $633,722(4) | $— | $839,344(4) | | Benefits and Perquisites | Erin N. Kane | $— | $— | $— | $— | $— | | | Christopher Gramm | $— | $— | $— | $— | $— | | | Achilles B. Kintiroglou | $— | $— | $— | $— | $— | | | Kelly Slieter | $— | $— | $— | $— | $— | | All Other— Payments/Benefits | Erin N. Kane | $— | $— | $— | $— | $— | | | Christopher Gramm | $— | $— | $— | $— | $— | | | Achilles B. Kintiroglou | $— | $— | $— | $— | $— | | | Kelly Slieter | $— | $— | $— | $— | $— | | Total | Erin N. Kane | $3,059,100 | $4,348,641 | $4,348,641 | $— | $9,778,698 | | | Christopher Gramm | $728,000 | $619,118 | $619,118 | $— | $2,003,839 | | | Achilles B. Kintiroglou | $816,000 | $1,119,378 | $1,119,378 | $— | $2,812,263 | | | Kelly Slieter | $731,000 | $865,492 | $865,492 | $— | $2,345,551 |

  86. POTENTIAL PAYMENTS UPON TERMINATION OR CHANGE IN CONTROL

    (1)Amounts represent each NEO’s lump sum cash severance payment under the AdvanSix Inc. Executive Severance Pay Plan. See above under the Compensation Discussion and Analysis under “Other AdvanSix Compensation & Benefit Programs - Severance Benefits” for a description of the terms of the Executive Severance Pay Plan. Mr. Manjeshwar is not included in the table because his employment was terminated effective July 9, 2025. In connection with his departure, Mr. Manjeshwar was entitled to severance benefits consistent with those provided for under the terms of the Executive Severance Pay Plan for a covered termination, specifically a lump sum cash payment of $591,623 representing one times base salary plus prorated target bonus. This payment was contingent on execution of his employment separation agreement and execution and non-revocation of a release of claims against the Company. (2)Under the terms of the AdvanSix Inc. Short-Term Incentive Plan, a participant must be employed on the payout date to receive her or his payout subject to certain exceptions. If a participant dies or becomes disabled during the annual performance period, he or she will receive a prorated award based on actual performance achievement. If a participant’s employment is involuntarily terminated other than for cause within 24 months after a change in control, he or she will receive a prorated target award. (3)Amounts represent each NEO’s entitlement under the AdvanSix Inc. Executive Severance Pay Plan to a lump sum cash payment representing the estimated aggregate cost that the Company would have incurred, less expected participant contributions, to subsidize continuation of her or his COBRA coverage for the specified severance period. (4)Amounts represent the value associated with accelerated vesting of the unvested AdvanSix PSU, RSU and stock option awards. The values are based on the closing market price per share of our Common Stock ($17.30) on December 31, 2025. Upon death or disability, unvested RSUs and stock options vest in full. Unvested PSUs vest on a prorated basis, with such proration based on the portion of the performance period during which the grantee was employed prior to termination due to death or disability, with the number of shares earned based upon actual performance achievement during the three-year performance period. Any earned PSUs are paid following the end of the performance period at the same time they are paid to grantees generally. The amount reported in these columns for PSUs reflects the actual number of shares earned under the 2023 PSU awards, 2/3 of the 2024 PSU awards at target and 1/3 of the 2025 PSU awards at target. Upon a change in control, unvested PSUs, RSUs, and stock options remain outstanding and do not vest unless they are not assumed or substituted for by the acquirer as determined in accordance with the terms of our stock incentive plan. Upon a termination without cause or for good reason within 24 months after the occurrence of a change in control, unvested RSUs and stock options vest in full. Unvested PSUs vest at the greater of target or the actual number of shares earned based on performance achievement as determined by the C&LD Committee. For purposes of this table, the amount reported in this column for PSUs reflects the 2023 PSU awards at actual, and the 2024 and 2025 PSU awards at target.

  87. POTENTIAL PAYMENTS UPON TERMINATION OR CHANGE IN CONTROL

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  88. 2025 PAY RATIO DISCLOSURE

    2025 PAY RATIO DISCLOSURE As required by the Dodd-Frank Act, we are providing the following information about the relationship of the annual total compensation of the individual identified as our median paid employee and the annual total compensation of our CEO. We believe this pay ratio is calculated in a manner consistent with SEC rules based on our payroll and employment records and the methodology described below. Because the SEC rules for identifying the median compensated employee and calculating the pay ratio based on that employee’s annual total compensation allow companies to adopt a variety of methodologies, to apply certain exclusions, and to make reasonable estimates and assumptions that reflect their compensation practices, the pay ratio reported by other companies may not be comparable to the pay ratio reported below, as other companies may have different employment and compensation practices and may utilize different methodologies, exclusions, estimates, and assumptions in calculating their own pay ratios. We identified the median employee for 2025 based on our population as of December 31, 2025. In 2025, this employee’s annual total compensation was $110,269 and the annual total compensation of our CEO was $5,647,438. Based on this information, the ratio of the annual total compensation of our CEO to the annual total compensation of the median employee for 2025 was 51 to 1. To identify the median employee, we used the following methodology: •We determined that, as of December 31, 2025, our employee population, including our full-time, part-time, and temporary employees, consisted of 1,665 individuals (excluding the CEO), who were actively employed during the 2025 calendar year, with 1,664 of these individuals located in the U.S. and 1 individual located outside of the U.S. Under SEC rules which provide an exemption for a de minimis number of employees located outside of the U.S., we excluded one employee located in Brazil from the employee population, constituting all of our non-U.S. employees. For purposes of determining our pay ratio, our designated employee population included a total of 1,664 U.S. employees and no non-U.S. employees. •To identify the median employee, we used actual cash compensation (base salary, incentive awards, and overtime) paid to each employee for the period from January 1, 2025 through December 31, 2025 as our consistently applied compensation measure. For employees who were hired or terminated in calendar year 2025 but did not work for the Company for the entire year, compensation was annualized for the full year. Compensation for part-time employees hired during the year was annualized but not converted into a full-time equivalent. The median employee’s total compensation for 2025 was determined in accordance with Item 402(c)(2)(x) of Regulation S-K, resulting in the annual total compensation amount reported above. With respect to our CEO’s annual total compensation, we used the amount reported in the Total column in the Summary Compensation Table of this proxy statement.

  89. PAY VERSUS PERFORMANCE

    PAY VERSUS PERFORMANCE In accordance with rules adopted by the SEC pursuant to the Dodd-Frank Act, we provide the following disclosure regarding executive “compensation actually paid” (“CAP”) and certain Company performance for the fiscal years listed below. CAP is calculated pursuant to SEC rules, which require various adjustments be made to amounts that have been previously reported in the Summary Compensation Table in previous years; the dollar amounts do not reflect the actual amount of compensation earned or received by our CEO or other NEOs during the applicable year. Please refer to “Executive Compensation – Compensation Discussion and Analysis” for a complete description of how executive compensation relates to Company performance and how the C&LD Committee makes its decisions.

  90. PAY VERSUS PERFORMANCE

    | | | | | | Year-end value of $100 invested on 12/31/2020 in: | | | | | | Summary Compensation Table Total for Erin N. Kane(1) | Compensation Actually Paid to Erin N. Kane(2) | Average Summary Compensation Table Total for Non-CEO NEOs (1) | Average Compensation Actually Paid to Non-CEO NEOs (1),(2) | ASIX(3) | S&P SmallCap 600 Materials Sector(3) | Net Income (in Millions) | Adjusted EBITDA (in Millions)(4) | | Year | $ | $ | $ | $ | $ | $ | $ | $ | | 2025 | 5,647,438 | 531,225 | 1,486,793 | 424,067 | 94.72 | 154.36 | 49.3 | 156.8 | | 2024 | 5,590,035 | 6,726,685 | 1,305,760 | 1,262,194 | 150.97 | 134.78 | 44.1 | 142.1 | | 2023 | 4,718,496 | 513,696 | 1,116,168 | 309,678 | 155.13 | 133.42 | 54.6 | 153.6 | | 2022 | 5,319,589 | 1,391,954 | 1,156,388 | (43,013) | 193.23 | 111.2 | 171.9 | 308.5 | | 2021 | 5,751,844 | 23,015,799 | 1,419,859 | 4,154,084 | 236.98 | 118.41 | 139.8 | 267 |

  91. PAY VERSUS PERFORMANCE

    | 41 | Proxy and Notice of Annual Meeting of Stockholders | 2026 |

  92. PAY VERSUS PERFORMANCE

    1) Erin N. Kane has served as our CEO since October 1, 2016. The information presented for Non-CEO NEOs reflects the average Summary Compensation Table total compensation and average CAP for the following executives by year:

  93. PAY VERSUS PERFORMANCE

    | 2025: Siddharth Manjeshwar, Achilles B. Kintiroglou, Kelly Slieter, Christopher Gramm | | 2024: Siddharth Manjeshwar, Michael Preston, Achilles B. Kintiroglou, Kelly Slieter, Christopher Gramm | | 2023: Michael Preston, Achilles B. Kintiroglou, Kelly Slieter, Christopher Gramm | | 2022: Michael Preston, Achilles B. Kintiroglou, Kelly Slieter, Christopher Gramm, Willem Blindenbach | | 2021: Michael Preston, Achilles B. Kintiroglou, Kelly Slieter, Willem Blindenbach |

  94. PAY VERSUS PERFORMANCE

    2) Deductions from, and additions to, total compensation in the Summary Compensation Table in 2025 to calculate CAP include:

  95. PAY VERSUS PERFORMANCE

    | | 2025 | | | | Erin N. Kane | Average Non-CEO NEOs | | | $ | $ | | Total Compensation from Summary Compensation Table | 5,647,438 | 1,486,793 | | Adjustments for Pension | | | | Adjustment for Summary Compensation Table Pension | (18,904) | (4,130) | | Amount added for current year service cost | 771 | 2,165 | | Total Adjustments for Pension | (18,133) | (1,965) | | Adjustments for Equity Awards | | | | Adjustment for grant date values in the Summary Compensation Table | (3,747,900) | (731,671) | | Year-end fair value of unvested awards granted in the current year | 2,136,109 | 302,920 | | Year-over-year difference of year-end fair values for unvested awards granted in prior years | (3,433,788) | (437,301) | | Fair values at vest date for awards granted and vested in current year | — | — | | Difference in fair values between prior year-end fair values and vest date fair values for awards granted in prior years | (52,501) | (5,467) | | Forfeitures during current year equal to prior year-end fair value | — | (189,242) | | Dividends or dividend equivalents not otherwise included in total | — | — | | Total Adjustments for Equity Awards | (5,098,080) | (1,060,761) | | Compensation Actually Paid (as calculated) | 531,225 | 424,067 |

  96. PAY VERSUS PERFORMANCE

    3) TSR is calculated by dividing the sum of the cumulative amount of dividends for the measurement period, assuming dividend reinvestment, and the difference between the Company’s share price at the end and the beginning of the measurement period by the Company’s share price at the beginning of the measurement period. TSR is determined based on the value of an initial fixed investment of $100. The TSR peer group consists of the S&P SmallCap Materials Sector. 4) Adjusted earnings before interest, taxes, depreciation, and amortization; please see Appendix A for a reconciliation of Net Income to Adjusted EBITDA.

  97. PAY VERSUS PERFORMANCE

    | 42 | Proxy and Notice of Annual Meeting of Stockholders | 2026 |

  98. Pay Versus Performance: Graphical Description

    Pay Versus Performance: Graphical Description The illustrations below provide a graphical description of CAP (as calculated in accordance with the SEC rules) and the following measures: a.the Company’s cumulative TSR and the Peer Group’s cumulative TSR; b.the Company’s Net Income; and c.the Company Selected Measure, which for AdvanSix is Adjusted EBITDA.