| Louis Berkman Investment CO10% owner · 5421 transactions | — | 3.13M | — | 691.1K | 1.10M |
| Berkman LouisChairman Emeritus, Director, 10% owner · 179 transactions | — | 2.58M†as of Jun 2007 | 120.0K | — | 120.0K |
| McBrayer BrettChief Executive Officer, Director · 48 transactions | — | 557.7K | 720.7K | 49.8K | — |
| CRAWFORD UNITED CorpMember of 10% owner group · 2 transactions | — | 234.3Kas of Oct 2020 | — | 45.7K | — |
| Lyon SamuelPresident of Union Electric · 35 transactions | — | 181.2K | 229.8K | 6.5K | 10.0K |
| McAuley Michael GSenior V.P., CFO & Treasurer · 41 transactions | — | 175.8Kas of May 2025 | 199.1K | 7.6K | — |
| Abel James JDirector · 19 transactions | — | 150.5Kas of May 2025 | 110.5K | 26.0K | 3.0K |
| Pforzheimer Carl H IIDirector · 28 transactions | — | 146.0K†as of May 2023 | 111.9K | 36.9K | 30.0K |
| Fessenden Elizabeth AnneDirector · 21 transactions | — | 126.7K | 113.4K | 11.3K | 13.7K |
| Paul Stephen EDirector · 15 transactions | — | 112.8Kas of May 2024 | 92.5K | — | — |
| Paul Laurence EDirector · 13 transactions | — | 91.7K | 80.4K | — | — |
| DeMichiei RobertDirector · 6 transactions | — | 85.6K | 67.4K | 18.2K | — |
| Anderson David GeorgeVP, CFO & Treasurer, Pres. ALS · 23 transactions | — | 83.0K | 82.4K | 4.1K | — |
| McNair Darrell LDirector · 9 transactions | — | 77.9K† | 58.3K | 19.6K | — |
| DiSanto Frederick D.Director · 10 transactions | — | 72.6K | 60.0K | 25.4K | — |
| Kenny Terrence WPresident,Air&Liq. Proc. Group · 36 transactions | — | 72.0Kas of Dec 2021 | 84.0K | 12.5K | 21.0K |
| Hoover RosePresident & Chief Admin. Off. · 37 transactions | — | 65.5Kas of Dec 2021 | 95.1K | 1.0K | 20.2K |
| Paul Robert AChairman & CEO, Director · 229 transactions | — | 56.7K†as of May 2014 | 120.0K | — | 335.0K |
| Gabelli Mario J +2 co-filers10% owner · 28 transactions | — | 56.2K†as of Oct 2015 | — | 1.9K | 31.5K |
| Dunlap Terry LDirector · 4 transactions | — | 46.1Kas of May 2021 | 22.2K | 5.0K | — |
| Stanik John SChief Executive Officer, Director · 12 transactions | — | 33.6Kas of May 2018 | 31.8K | 3.9K | — |
| Scagline RodneyPresident of Union Electric · 12 transactions | — | 31.5Kas of Dec 2018 | 18.1K | 13.0K | — |
| Gabelli Mario J +3 co-filers10% owner · 4 transactions | — | 29.5K†as of Sep 2016 | — | — | 1.7K |
| Carroll Leonard MDirector · 10 transactions | — | 25.6Kas of Nov 2018 | 23.1K | 1.0K | — |
| Lieberman William KDirector · 38 transactions | — | 25.0K | 113.6K | 5.6K | — |
| Trainor MariaV.P. & General Counsel · 16 transactions | — | 20.6Kas of May 2019 | 23.4K | — | — |
| Johnson MarlissV.P. Fin & Chief Acctg Officer · 18 transactions | — | 17.1Kas of Sep 2020 | 28.4K | — | 12.5K |
| Gould Paul ADirector · 11 transactions | — | 15.9Kas of May 2017 | 14.9K | 10.0K | 12.0K |
| Zatawski KeithChief Risk Officer · 7 transactions | — | 12.0Kas of Sep 2020 | 7.4K | — | — |
| Appel Robert JDirector · 6 transactions | — | 10.9Kas of May 2014 | 5.1K | 6.0K | 2.0K |
| German Michael IDirector · 21 transactions | — | 10.0K | 129.9K | 59.0K | — |
| Stromholm FredrikDirector · 2 transactions | — | 8.2Kas of May 2017 | 8.2K | — | — |
| Whitty AnnDirector · 1 transaction | — | 7.2Kas of May 2018 | 7.2K | — | — |
| Clutterbuck TimothyPresident of ASW Steel Inc · 5 transactions | — | 4.4Kas of May 2019 | 5.4K | — | — |
| Siddons Ernest GDirector · 39 transactions | — | 2.0Kas of Dec 2018 | 122.1K | 10.0K | 105.8K |
| Schultz Robert FVice President&Senior Counsel · 37 transactions | — | 200as of May 2013 | 20.0K | — | 20.0K |