According to recent filings covering the 90 days ending February 19, 2026, the three most significant insider holders at Clean Harbors are Exec Chair And Cto. Alan S Mckim (2.38Mn shares), Co Ceo Michael Louis Battles (98.69K shares), Co Ceo Eric W Gerstenberg (66.50K shares).
| Holder | Position | Shares | Report Date |
|---|---|---|---|
| Alan S Mckim | Exec Chair And Cto. | 2,376,488 | 03 Jul, 2025 |
| Michael Louis Battles | Co Ceo | 98,686 | 03 Feb, 2026 |
| Eric W Gerstenberg | Co Ceo | 66,500 | 03 Feb, 2026 |
| Brian P Weber | Evp (Chesi) | 56,240 | 03 Feb, 2026 |
| George L Curtis | Exec. Vice President (Chesi) | 47,415 | 03 Feb, 2026 |
| Sharon M. Gabriel | Evp/Cio (Chesi) | 29,372 | 03 Feb, 2026 |
| Michael J Twohig | Evp (Chesi) | 28,857 | 29 Mar, 2023 |
| Thomas J Shields | 28,762 | 26 May, 2022 | |
| Edward G Galante | 24,809 | 23 May, 2025 | |
| Eric J. Dugas | Evp Chief Financial Officer | 22,809 | 03 Feb, 2026 |
| Rebecca Underwood | President & Evp Facilities | 20,210 | 03 Feb, 2026 |
| Jeroen Diderich | Evp&President Of Sales&Service | 17,855 | 03 Feb, 2026 |
| Robert Speights | President And Industrial Services | 16,310 | 28 May, 2025 |
| Rod Marlin | 14,427 | 12 May, 2021 | |
| Lauren States | 11,496 | 14 Nov, 2025 | |
| John R. Welch | 10,987 | 29 Dec, 2025 | |
| Charles H. Ii Geer | Evp And Industrial Services | 10,963 | 03 Feb, 2026 |
| Melkeya Mcduffie | Evp And Human Resources Officer | 10,094 | 26 May, 2023 |
| Andrea Robertson | 9,458 | 06 Aug, 2025 | |
| Robert Willett | 9,376 | 23 May, 2025 | |
| Robert W. Harrison | Evp And Ehs | 7,034 | 03 Feb, 2026 |
| John T Preston | 6,392 | 23 May, 2025 | |
| Marcy L. Reed | 5,917 | 23 May, 2025 | |
| Eugene G Banucci | 5,598 | 12 Jun, 2023 | |
| Jeffrey Herbert Knapp | Evp Hr (Chesi) | 5,311 | 24 Nov, 2021 |
| Shelley Jr Stewart | 3,871 | 23 May, 2025 | |
| Karyn Polito | 3,015 | 23 May, 2025 | |
| Alison A. Quirk | 2,978 | 06 Jun, 2025 |
* Please note that the shares above only reflect shares from the fund portfolio and the institutional portfolio. Shares from the personal portfolio are excluded from this Institutional Ownership Page. See these insiders' latest transactions here on Insider Page.
| Transaction Date | Insider Name | Security Class | Transaction Type | Shares Traded | Price | Shares Remaining | Ownership | Code |
|---|---|---|---|---|---|---|---|---|
| 02 Feb, 2026 | Eric W Gerstenberg | Common Stock | D | 4,934 | $259.91 | 45,520 | D | F |
| 02 Feb, 2026 | George L Curtis | Common Stock | D | 249 | $259.91 | 47,415 | D | F |
| 02 Feb, 2026 | Brian P Weber | Common Stock | D | 1,394 | $259.91 | 52,018 | D | F |
| 02 Feb, 2026 | Michael Louis Battles | Common Stock | D | 5,205 | $259.91 | 77,706 | D | F |
| 02 Feb, 2026 | Eric J. Dugas | Common Stock | D | 567 | $259.91 | 18,721 | D | F |
| 02 Feb, 2026 | Sharon M. Gabriel | Common Stock | D | 508 | $259.91 | 26,733 | D | F |
| 02 Feb, 2026 | Robert W. Harrison | Common Stock | D | 184 | $259.91 | 5,601 | D | F |
| 02 Feb, 2026 | Rebecca Underwood | Common Stock | D | 425 | $259.91 | 16,859 | D | F |
| 02 Feb, 2026 | Jeroen Diderich | Common Stock | D | 105 | $259.91 | 13,667 | D | F |
| 02 Feb, 2026 | Charles H. Ii Geer | Common Stock | D | 197 | $259.91 | 8,617 | D | F |
| 01 Feb, 2026 | Eric W Gerstenberg | Common Stock | A | 10,290 | $0.00 | 55,810 | D | A |
| 01 Feb, 2026 | Eric W Gerstenberg | Common Stock | A | 10,690 | $0.00 | 66,500 | D | A |
| 01 Feb, 2026 | Brian P Weber | Common Stock | A | 3,166 | $0.00 | 55,184 | D | A |
| 01 Feb, 2026 | Brian P Weber | Common Stock | A | 1,056 | $0.00 | 56,240 | D | A |
| 01 Feb, 2026 | Michael Louis Battles | Common Stock | A | 10,290 | $0.00 | 87,996 | D | A |
| 01 Feb, 2026 | Michael Louis Battles | Common Stock | A | 10,690 | $0.00 | 98,686 | D | A |
| 01 Feb, 2026 | Eric J. Dugas | Common Stock | A | 1,022 | $0.00 | 22,809 | D | A |
| 01 Feb, 2026 | Eric J. Dugas | Common Stock | A | 3,066 | $0.00 | 21,787 | D | A |
| 01 Feb, 2026 | Sharon M. Gabriel | Common Stock | A | 566 | $0.00 | 29,372 | D | A |
| 01 Feb, 2026 | Sharon M. Gabriel | Common Stock | A | 2,073 | $0.00 | 28,806 | D | A |