Key facts
- WELLINGTON MANAGEMENT GROUP LLP filed SCHEDULE 13G/A for Clean Harbors, Inc. Common Stock (CLH).
- Disclosed ownership: 6.8%.
- Date of event: 31 Mar 2026.
WELLINGTON MANAGEMENT GROUP LLP - 31 Mar 2026 SCHEDULE 13G/A Report for Clean Harbors, Inc. Common Stock (CLH)
- Filing manager
- WELLINGTON MANAGEMENT GROUP LLP
- Reporting owner
- Wellington Management Group LLP
- Security
- Clean Harbors, Inc. Common Stock
- Symbol
- CLH
- Shares outstanding
- 52,589,147 shares
- Disclosed ownership
- 3,576,062 shares
- Ownership
- 6.8%
- Form type
- SCHEDULE 13G/A
- Filing time
- 15 May 2026, 07:24:39 UTC
- Date of event
- 31 Mar 2026
- Previous filing
- 10 Feb 2026
- SEC
- View on sec.gov
Key filing fact
WELLINGTON MANAGEMENT GROUP LLP disclosed 6.8% ownership in Clean Harbors, Inc. Common Stock (CLH) on 31 Mar 2026.
Change
- Previous schedule filing date: 10 Feb 2026.
- Current filing was accepted on 15 May 2026, 07:24.
Research use
- This page explains what this Schedule 13D/13G filing tells you before manager-level rows.
- You can verify ownership claims directly against the original SEC filing.
Evidence
Backed by Schedule 13D/13G
See Original Filing
Beneficial ownership values are sourced from the original SEC Schedule 13D/13G filing.
Reporting persons
Reporting managers (4)
Names, ownership, voting power, signatures, titles, and CIKs as disclosed in this Schedule 13D/G filing.
| Name | Ownership | Shares Owned | sole voting power | shared voting power | Signature | Title | CIK |
|---|---|---|---|---|---|---|---|
| Wellington Management Group LLP | 6.8% | 3,576,062 | 0 | 3,017,643 | Matthew Revell | Compliance Manager | |
| Wellington Group Holdings LLP | 6.8% | 3,576,062 | 0 | 3,017,643 | Matthew Revell | Compliance Manager | |
| Wellington Investment Advisors Holdings LLP | 6.8% | 3,576,062 | 0 | 3,017,643 | Matthew Revell | Compliance Manager | |
| Wellington Management Company LLP | 5.5% | 3,576,062 | 0 | 2,825,876 | Matthew Revell | Compliance Manager |
CIK / CUSIP context first