As of March 23, 2026, the three largest insider holders of CLH are Alan S Mckim (Exec Chair, Cto., 2.07Mn shares), Michael Louis Battles (Co Ceo, 98.69K shares), Brian P Weber (Evp (Chesi), 56.24K shares).
| Holder | Position | Shares (Direct) | Shares (Indirect) | Report Date |
|---|---|---|---|---|
| Alan S Mckim | Exec Chair, Cto. | 0 | 2,065,368 | 05 Mar, 2026 |
| Michael Louis Battles | Co Ceo | 95,387 | 0 | 17 Mar, 2026 |
| Brian P Weber | Evp (Chesi) | 48,728 | 0 | 17 Mar, 2026 |
| George L Curtis | Exec. Vice President (Chesi) | 46,048 | 0 | 17 Mar, 2026 |
| Eric W Gerstenberg | Co Ceo | 38,877 | 0 | 19 Mar, 2026 |
| Alan S Mckim | Exec Chair, Cto. | 32,762 | 0 | 17 Mar, 2026 |
| Michael J Twohig | Evp (Chesi) | 28,857 | 0 | 29 Mar, 2023 |
| Thomas J Shields | 28,762 | 0 | 26 May, 2022 | |
| Edward G Galante | 24,809 | 0 | 23 May, 2025 | |
| Sharon M. Gabriel | Evp/Cio (Chesi) | 21,065 | 0 | 17 Mar, 2026 |
| Rebecca Underwood | President Evp Facilities | 18,684 | 0 | 17 Mar, 2026 |
| Jeroen Diderich | Evppresident Of Salesservice | 17,855 | 0 | 03 Feb, 2026 |
| Robert Speights | President, Industrial Services | 16,310 | 0 | 28 May, 2025 |
| Rod Marlin | 14,427 | 0 | 12 May, 2021 | |
| Eric J. Dugas | Evp Chief Financial Officer | 13,979 | 0 | 17 Mar, 2026 |
| Lauren States | 11,496 | 0 | 14 Nov, 2025 | |
| Charles H. Ii Geer | Evp, Industrial Services | 10,839 | 0 | 17 Mar, 2026 |
| John R. Welch | 10,237 | 0 | 20 Feb, 2026 | |
| Melkeya Mcduffie | Evp, Human Resources Officer | 10,094 | 0 | 26 May, 2023 |
| Andrea Robertson | 9,458 | 0 | 06 Aug, 2025 | |
| Robert Willett | 9,376 | 0 | 23 May, 2025 | |
| Robert W. Harrison | Evp, Ehs | 6,648 | 0 | 17 Mar, 2026 |
| John T Preston | 6,392 | 0 | 23 May, 2025 | |
| Jeffrey Herbert Knapp | Evp Hr (Chesi) | 5,311 | 0 | 24 Nov, 2021 |
| Marcy L. Reed | 5,081 | 0 | 19 Mar, 2026 | |
| Shelley Jr Stewart | 3,871 | 0 | 23 May, 2025 | |
| Karyn Polito | 3,015 | 0 | 23 May, 2025 | |
| Alison A. Quirk | 2,978 | 0 | 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 |
|---|---|---|---|---|---|---|---|---|
| 18 Mar, 2026 | Eric W Gerstenberg | Common Stock | D | 1,000 | $293.00 | 38,877 | D | S |
| 18 Mar, 2026 | Marcy L. Reed | Common Stock | D | 836 | $287.94 | 5,081 | D | S |
| 13 Mar, 2026 | Sharon M. Gabriel | Common Stock | D | 727 | $288.93 | 22,466 | D | F |
| 13 Mar, 2026 | George L Curtis | Common Stock | D | 350 | $288.93 | 47,065 | D | F |
| 13 Mar, 2026 | Rebecca Underwood | Common Stock | D | 125 | $288.93 | 20,085 | D | F |
| 13 Mar, 2026 | Robert W. Harrison | Common Stock | D | 18 | $288.93 | 7,016 | D | F |
| 13 Mar, 2026 | Brian P Weber | Common Stock | D | 960 | $288.93 | 55,280 | D | F |
| 13 Mar, 2026 | Eric J. Dugas | Common Stock | D | 630 | $288.93 | 15,303 | D | F |
| 13 Mar, 2026 | Eric W Gerstenberg | Common Stock | D | 977 | $288.93 | 42,043 | D | F |
| 13 Mar, 2026 | Charles H. Ii Geer | Common Stock | D | 139 | $0.00 | 10,839 | D | D |
| 13 Mar, 2026 | Michael Louis Battles | Common Stock | D | 1,148 | $288.93 | 97,538 | D | F |
| 13 Mar, 2026 | Robert W. Harrison | Common Stock | D | 368 | $0.00 | 6,648 | D | D |
| 13 Mar, 2026 | Eric W Gerstenberg | Common Stock | D | 2,166 | $0.00 | 39,877 | D | D |
| 13 Mar, 2026 | George L Curtis | Common Stock | D | 1,028 | $0.00 | 46,048 | D | D |
| 13 Mar, 2026 | Rebecca Underwood | Common Stock | D | 1,401 | $0.00 | 18,684 | D | D |
| 13 Mar, 2026 | Brian P Weber | Common Stock | D | 1,869 | $0.00 | 53,411 | D | D |
| 13 Mar, 2026 | Eric J. Dugas | Common Stock | D | 1,324 | $0.00 | 13,979 | D | D |
| 13 Mar, 2026 | Sharon M. Gabriel | Common Stock | D | 1,401 | $0.00 | 21,065 | D | D |
| 13 Mar, 2026 | Michael Louis Battles | Common Stock | D | 2,166 | $0.00 | 95,387 | D | D |
| 17 Mar, 2026 | Brian P Weber | Common Stock | D | 4,683 | $293.39 | 48,728 | D | S |