CLH's three largest insider shareholders as of June 09, 2026 are Alan S Mckim (Exec Chair, Cto., 2.07Mn shares), Michael Louis Battles (Co Ceo, 95.39K shares), Brian P Weber (Evp (Chesi), 48.73K shares).
| Holder | Position | Shares (Direct) | Shares (Indirect) | Report Date |
|---|---|---|---|---|
| John T Preston | - | 6,392 | 0 | 23 May, 2025 |
| Alan S Mckim | Exec Chair, Cto. | 0 | 2,065,368 | 05 Mar, 2026 |
| Eugene G Banucci | - | 5,598 | 0 | 12 Jun, 2023 |
| Thomas J Shields | - | 28,762 | 0 | 26 May, 2022 |
| Eric W Gerstenberg | Co Ceo | 38,877 | 0 | 19 Mar, 2026 |
| George L Curtis | Exec. Vice President (Chesi) | 46,048 | 0 | 17 Mar, 2026 |
| Michael J Twohig | Evp (Chesi) | 28,857 | 0 | 29 Mar, 2023 |
| Andrea Robertson | - | 9,458 | 0 | 06 Aug, 2025 |
| Brian P Weber | Evp (Chesi) | 48,728 | 0 | 17 Mar, 2026 |
| Michael Louis Battles | Co Ceo | 95,387 | 0 | 17 Mar, 2026 |
| Robert Willett | - | 9,376 | 0 | 23 May, 2025 |
| John R. Welch | - | 10,237 | 0 | 20 Feb, 2026 |
| Eric J. Dugas | Evp Chief Financial Officer | 13,979 | 0 | 17 Mar, 2026 |
| Lauren States | - | 11,496 | 0 | 14 Nov, 2025 |
| Jeffrey Herbert Knapp | Evp Hr (Chesi) | 5,311 | 0 | 24 Nov, 2021 |
| Robert Speights | President, Industrial Services | 16,310 | 0 | 28 May, 2025 |
| Sharon M. Gabriel | Evp/Cio (Chesi) | 21,065 | 0 | 17 Mar, 2026 |
| Marcy L. Reed | - | 5,081 | 0 | 19 Mar, 2026 |
| Melkeya Mcduffie | Evp, Human Resources Officer | 10,094 | 0 | 26 May, 2023 |
| Robert W. Harrison | Evp, Ehs | 6,648 | 0 | 17 Mar, 2026 |
| Karyn Polito | - | 3,015 | 0 | 23 May, 2025 |
| Rebecca Underwood | President Evp Facilities | 18,684 | 0 | 17 Mar, 2026 |
| Jeroen Diderich | Evppresident Of Salesservice | 17,855 | 0 | 03 Feb, 2026 |
| Charles H. Ii Geer | Evp, Industrial Services | 10,839 | 0 | 17 Mar, 2026 |
* 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 | Marcy L. Reed | Common Stock | D | 836 | $287.94 | 5,081 | D | S |
| 18 Mar, 2026 | Eric W Gerstenberg | Common Stock | D | 1,000 | $293.00 | 38,877 | D | S |
| 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 | Sharon M. Gabriel | Common Stock | D | 727 | $288.93 | 22,466 | D | F |
| 13 Mar, 2026 | Robert W. Harrison | Common Stock | D | 18 | $288.93 | 7,016 | D | F |
| 13 Mar, 2026 | Charles H. Ii Geer | Common Stock | D | 139 | $0.00 | 10,839 | D | D |
| 13 Mar, 2026 | Eric W Gerstenberg | Common Stock | D | 977 | $288.93 | 42,043 | D | F |
| 13 Mar, 2026 | Eric J. Dugas | Common Stock | D | 630 | $288.93 | 15,303 | D | F |
| 13 Mar, 2026 | Eric J. Dugas | Common Stock | D | 630 | $288.93 | 15,303 | D | F |
| 13 Mar, 2026 | Rebecca Underwood | Common Stock | D | 125 | $288.93 | 20,085 | D | F |
| 13 Mar, 2026 | Brian P Weber | Common Stock | D | 960 | $288.93 | 55,280 | D | F |
| 13 Mar, 2026 | Robert W. Harrison | Common Stock | D | 18 | $288.93 | 7,016 | D | F |
| 13 Mar, 2026 | George L Curtis | Common Stock | D | 350 | $288.93 | 47,065 | D | F |
| 13 Mar, 2026 | Charles H. Ii Geer | Common Stock | D | 139 | $0.00 | 10,839 | D | D |
| 13 Mar, 2026 | Eric W Gerstenberg | Common Stock | D | 977 | $288.93 | 42,043 | D | F |
| 13 Mar, 2026 | George L Curtis | Common Stock | D | 350 | $288.93 | 47,065 | D | F |
| 13 Mar, 2026 | Brian P Weber | Common Stock | D | 960 | $288.93 | 55,280 | D | F |
| 13 Mar, 2026 | Rebecca Underwood | Common Stock | D | 125 | $288.93 | 20,085 | D | F |