Clean Harbors, Inc. (CLH) has 20 known insider and institutional holders on record. The largest holder is Battles Michael Louis with 95,387 shares. Other notable holders include Weber Brian P and CURTIS GEORGE L.
Over the last 12 months, insiders have made 83 transactions in CLH stock — 20 buys (valued at $467K) and 18 sells (valued at $60.06M). Insider buying has outpaced selling during this period, which may signal confidence in the company's prospects.
CLH Insider Ownership
Top Holder
Battles Michael Louis
95,387 shares
Buys (12 mo)
20
$467K value
Sells (12 mo)
18
$60.06M value
12-Month Transaction Activity
Top Insider Holders
| # |
Name |
Role |
Shares Owned |
Last Filed |
Relative Size |
| 1 |
Battles Michael Louis |
Co-CEO |
95,387 |
2026-03-17 |
|
| 2 |
Weber Brian P |
EVP (chesi) |
53,411 |
2026-03-17 |
|
| 3 |
Curtis George L |
Exec. Vice President (chesi) |
46,048 |
2026-03-17 |
|
| 4 |
Lefebvre Marvin G |
EVP (chi Sub) |
45,394 |
2017-12-11 |
|
| 5 |
Gerstenberg Eric W |
Co-CEO |
38,877 |
2026-03-19 |
|
| 6 |
Kraus Eric A |
Exec. Vice President (chesi) |
33,108 |
2018-09-07 |
|
| 7 |
Mckim Alan S |
Exec Chair, CTO. |
32,762 |
2026-03-17 |
|
| 8 |
Twohig Michael J |
Officer |
28,857 |
2023-03-29 |
|
| 9 |
Shields Thomas J |
Director |
28,762 |
2022-05-26 |
|
| 10 |
Galante Edward G |
Director |
24,809 |
2025-05-23 |
|
| 11 |
Cowan Grace |
EVP Customer Service (chesi) |
22,914 |
2018-09-07 |
|
| 12 |
Gabriel Sharon M. |
EVP/cio (chesi) |
21,065 |
2026-03-17 |
|
| 13 |
Underwood Rebecca |
President & EVP Facilities |
18,684 |
2026-03-17 |
|
| 14 |
Mansy Loan Nguyen |
President Env Sales & Service |
17,163 |
2023-08-22 |
|
| 15 |
Diderich Jeroen |
EVP&president of Sales&service |
16,808 |
2026-02-03 |
|
| 16 |
Speights Robert |
President, Industrial Services |
16,310 |
2025-05-28 |
|
| 17 |
Marlin Rod |
Director |
14,427 |
2021-05-12 |
|
| 18 |
Bouldin Mark G. |
EVP/sk |
14,272 |
2018-06-04 |
|
| 19 |
Dugas Eric J. |
EVP Chief Financial Officer |
13,979 |
2026-03-17 |
|
| 20 |
Parry David M |
Executive Vice President |
11,544 |
2018-09-18 |
|
Recent Transactions (last 12 months)
| Date |
Name |
Role |
Type |
Shares |
Price |
Value |
| 2026-03-18 |
Reed Marcy L. |
Director |
Informative Sell |
836 |
$287.94 |
$240.72K |
| 2026-03-18 |
Gerstenberg Eric W |
Co-CEO |
Informative Sell |
1,000 |
$293.00 |
$293K |
| 2026-03-13 |
Geer Charles H. Ii |
EVP, Industrial Services |
Return of Shares |
139 |
- |
- |
| 2026-03-13 |
Underwood Rebecca |
President & EVP Facilities |
Return of Shares |
1,401 |
- |
- |
| 2026-03-13 |
Harrison Robert W. |
EVP, Ehs |
Return of Shares |
368 |
- |
- |
| 2026-03-13 |
Gabriel Sharon M. |
EVP/cio (chesi) |
Return of Shares |
1,401 |
- |
- |
| 2026-03-13 |
Dugas Eric J. |
EVP Chief Financial Officer |
Return of Shares |
1,324 |
- |
- |
| 2026-03-13 |
Battles Michael Louis |
Co-CEO |
Return of Shares |
2,166 |
- |
- |
| 2026-03-17 |
Weber Brian P |
EVP (chesi) |
Informative Sell |
4,683 |
$293.39 |
$1.37M |
| 2026-03-13 |
Weber Brian P |
EVP (chesi) |
Return of Shares |
1,869 |
- |
- |
| 2026-03-13 |
Curtis George L |
Exec. Vice President (chesi) |
Return of Shares |
1,028 |
- |
- |
| 2026-03-13 |
Gerstenberg Eric W |
Co-CEO |
Return of Shares |
2,166 |
- |
- |
| 2026-03-13 |
Mckim Alan S |
Exec Chair, CTO. |
Tax Withholding of RSU |
1,265 |
$288.93 |
$365.5K |
| 2026-03-04 |
Mckim Alan S |
Exec Chair, CTO. |
Informative Sell |
100,000 |
$292.65 |
$29.27M |
| 2026-02-23 |
Gerstenberg Eric W |
Co-CEO |
Informative Sell |
2,500 |
$279.86 |
$699.65K |
| 2026-02-19 |
Mckim Alan S |
Exec Chair, CTO. |
Gift (Given) |
10,000 |
- |
- |
| 2026-02-20 |
Gabriel Sharon M. |
EVP/cio (chesi) |
Informative Sell |
3,540 |
$282.07 |
$998.53K |
| 2026-02-20 |
Dugas Eric J. |
EVP Chief Financial Officer |
Informative Sell |
2,788 |
$281.31 |
$784.29K |
| 2026-02-19 |
Welch John R. |
Director |
Informative Sell |
750 |
$273.07 |
$204.8K |
| 2026-02-02 |
Geer Charles H. Ii |
EVP, Industrial Services |
Tax Withholding of RSU |
197 |
$259.91 |
$51.2K |
| 2026-02-01 |
Geer Charles H. Ii |
EVP, Industrial Services |
RSU Award |
1,843 |
- |
- |
| 2026-02-02 |
Diderich Jeroen |
EVP&president of Sales&service |
Tax Withholding of RSU |
105 |
$259.91 |
$27.29K |
| 2026-02-01 |
Diderich Jeroen |
EVP&president of Sales&service |
RSU Award |
3,141 |
- |
- |
| 2026-02-02 |
Underwood Rebecca |
President & EVP Facilities |
Tax Withholding of RSU |
425 |
$259.91 |
$110.46K |
| 2026-02-01 |
Underwood Rebecca |
President & EVP Facilities |
RSU Award |
2,513 |
- |
- |
