| Gottwald William MVice Chairman of the Board, Director · 34 transactions | — | 3.66M†as of May 2009 | 292.2K | — | 208.1K |
| Gottwald John DDirector · 21 transactions | — | 2.63M†as of Mar 2008 | 1.5K | — | 534.3K |
| Gottwald Floyd D JrFormer 10% Owner · 22 transactions | — | 1.40Mas of Feb 2008 | 330.3K | — | 436.1K |
| Kissam Luther C IVDirector · 122 transactions | — | 374.4K†as of Mar 2021 | 1.11M | 4.5K | 698.8K |
| Rohr Mark CExecutive Chairman of the Brd, Director · 32 transactions | — | 290.2K†as of Dec 2011 | 1.05M | 5.0K | 675.0K |
| Diemer Richard J JRSenior Vice President, CFO · 12 transactions | — | 146.5K†as of Aug 2010 | 140.0K | 10.0K | — |
| Masters J KentChairman & CEO, Director · 36 transactions | — | 87.5K | 185.7K | 10.7K | 30.7K |
| Tozier ScottEVP & CFO · 99 transactions | — | 72.7K†as of Mar 2023 | 234.4K | — | 104.1K |
| Newbill George ASr VP Manufacturing Operations · 18 transactions | — | 70.8K†as of Feb 2008 | 123.5K | — | 111.9K |
| Norris EricChief Commercial Officer · 61 transactions | — | 53.4K | 82.6K | 4.3K | 15.2K |
| Parnell Anthony StephenVP - Global Supply Chain · 33 transactions | — | 51.8K†as of Mar 2013 | 123.1K | — | 101.8K |
| Hurley RaymondVP Alterntiv Fuel Technologies · 8 transactions | — | 48.3K†as of Feb 2008 | 65.5K | — | 28.0K |
| Johnson Netha N.Chief Operations Officer · 48 transactions | — | 42.1Kas of Feb 2025 | 62.4K | 1.1K | 1.1K |
| Dabkowski John GVP Business Development · 26 transactions | — | 37.9K†as of Apr 2009 | 153.0K | — | 103.2K |
| Nicols John JSr VP, Strat Dev & Catalysts · 28 transactions | — | 34.7K†as of Apr 2012 | 152.5K | 2.3K | 155.7K |
| Preston Seymour S IIIDirector · 9 transactions | — | 33.9Kas of Apr 2008 | 2.0K | — | — |
| Maine Douglas LDirector · 8 transactions | — | 28.6Kas of Jul 2019 | 8.6K | 7.8K | 10.0K |
| Stewart Charles EDirector · 14 transactions | — | 27.5Kas of Nov 2010 | 7.2K | — | — |
| Allen William B JrVP, CAO and Corp Controller · 17 transactions | — | 27.2K†as of Jan 2013 | 22.2K | 1.5K | 20.0K |
| Crawford Raphael GoszczPresident, Catalysts · 55 transactions | — | 23.4Kas of Feb 2023 | 79.9K | — | 48.4K |
| LaBauve Donald J. Jr.VP, Corporate Controller & CAO · 44 transactions | — | 23.2K† | 21.1K | — | 3.6K |
| Sheorey Neal RaviChief Financial Officer · 8 transactions | — | 20.9K | 16.6K | — | — |
| Zumstein Ronald CSr VP, Mfg & Supply Chain · 5 transactions | — | 20.1K†as of Feb 2015 | 1.4K | — | 5.3K |
| Juneau MatthewEVP, Corp Strategy & IR · 39 transactions | — | 20.1K†as of Feb 2018 | 105.1K | — | 89.3K |
| Van Muylem LucVice Pres - Polymer Additives · 8 transactions | — | 20.1K†as of Jan 2009 | 36.0K | — | 20.3K |
| Fishman Richard G.VP, Treasurer & Chief Tax Coun · 10 transactions | — | 18.4K†as of Oct 2011 | 15.7K | — | 7.0K |
| Whittemore Anne MDirector · 13 transactions | — | 17.9K†as of Jul 2014 | 4.3K | — | — |
| Steitz John MPresident and COO · 28 transactions | — | 17.6K†as of Aug 2012 | 459.0K | — | 423.9K |
| Mummert Mark RichardChief Supply Chain Officer · 12 transactions | — | 17.5K | 11.6K | — | 843 |
| Fourie Jacobus G.Chief Capital Projects Officer · 12 transactions | — | 16.9Kas of Feb 2024 | 7.7K | — | — |
| Nokes Jim WDirector · 12 transactions | — | 16.8Kas of Jul 2017 | 12.8K | 4.0K | — |
| Lima Cynthia ReneeSVP, Ext. Affairs & Comm. · 9 transactions | — | 14.4K | 10.3K | — | — |
| Anderson Melissa H.Chief Bus..Transformation Off. · 20 transactions | — | 14.2K† | 21.6K | — | 8.5K |
| Taggart Harriett TeeDirector · 20 transactions | — | 13.7Kas of Jul 2019 | 20.2K | — | — |
| Gardner Ronald RoyVice President · 22 transactions | — | 13.5K†as of Feb 2013 | 102.2K | — | 81.1K |
| Krupa Ander C.General Counsel & Sec · 7 transactions | — | 13.2K | 9.4K | — | 288 |
| Wolff Alejandro DanielDirector · 20 transactions | — | 13.0K | 11.5K | — | — |
| Brlas LaurieDirector · 13 transactions | — | 12.9K†as of Jul 2025 | 12.9K | — | — |
| Morrill Richard LDirector · 21 transactions | — | 12.6Kas of Apr 2012 | 10.5K | — | 4.7K |
| Narwold Karen GEVP, Chief Admin Officer · 123 transactions | — | 12.6K†as of Mar 2023 | 200.8K | — | 141.8K |
| Seavers DeanDirector · 11 transactions | — | 12.0Kas of Jul 2025 | 12.0K | — | — |
| Steiner Gerald ADirector · 12 transactions | — | 11.9K | 10.9K | 1.0K | — |
| Wilson D MichaelSr VP, Pres Catalyst Solutions · 7 transactions | — | 11.7Kas of Oct 2014 | 2.5K | 10.0K | — |
| Sherman John JrDirector · 34 transactions | — | 11.5K†as of Aug 2016 | 10.7K | 12.5K | 20.1K |
| Motto AmyVice President, Catalysts · 15 transactions | — | 10.2K†as of Feb 2013 | 8.2K | — | 7.3K |
| OConnell Diarmuid B.Director · 12 transactions | — | 8.2Kas of Jul 2025 | 12.0K | — | — |
| Obrien James J /KYDirector · 13 transactions | — | 8.0Kas of Jul 2025 | 6.0K | 2.1K | — |
| Kelliher Susan M.VP - Human Resources · 11 transactions | — | 7.1K†as of Mar 2016 | 4.3K | — | — |
| Martin Scott A.Vice President, Fine Chemistry · 8 transactions | — | 6.8K†as of Feb 2013 | 22.4K | — | 18.0K |
| Coleman Kristin M.EVP, General Counsel · 4 transactions | — | 6.7K†as of Feb 2024 | 1.8K | 2.7K | — |
| Barichivich John Clarence IIIVP, Controller & CAO · 48 transactions | — | 6.0K†as of May 2024 | 9.0K | — | 3.4K |
| Minor Glenda JDirector · 5 transactions | — | 5.9Kas of Jul 2025 | 5.9K | — | — |
| Gagarinas Autumn M.Chief People Officer · 5 transactions | — | 5.4K | 2.0K | — | — |
| Cramer Ralf HansDirector · 11 transactions | — | 5.4Kas of Jul 2025 | 6.3K | — | — |
| Grant Stacy GotoGeneral Counsel & Sec · 2 transactions | — | 4.5Kas of Feb 2025 | 7.6K | — | — |
| Ryan David TerrenceVP, Corp. Strategy & IR · 8 transactions | — | 3.7Kas of May 2020 | 4.4K | — | — |
| Broaddus J Alfred JrDirector · 9 transactions | — | 3.2Kas of Apr 2012 | 2.9K | — | — |
| Hernandez William HDirector · 1 transaction | — | 1.9Kas of Jul 2019 | 1.9K | — | — |
| Van Deursen HollyDirector · 1 transaction | — | 1.6Kas of Jul 2019 | 1.6K | — | — |
| Marlow DeeAnne JSVP, Chief HR Officer · 1 transaction | — | 1.0Kas of May 2019 | — | 1.0K | — |
| Collins Michelle TDirector · 1 transaction | — | 325 | 325 | — | — |
| Ide R William IIIDirector · 10 transactions | — | 0as of Aug 2012 | 1.0K | 2.0K | 6.1K |