Wellington Management Group LLP Reports 6.8% Stake in Clean Harbors, Inc. (CLH) via Schedule 13G/A

Wellington Management Group LLP, along with its affiliates Wellington Group Holdings LLP, Wellington Investment Advisors Holdings LLP, and Wellington Management Company LLP, filed a Schedule 13G/A on May 15, 2026, regarding their holdings in Clean Harbors, Inc. (CLH). As of the event date on March 31, 2026, the reporting entities collectively beneficially own 3,576,062 shares of common stock, representing a 6.8% ownership stake in the company. This filing marks an increase from the previously reported 0.0% ownership, indicating a significant new position or restoration of a previously exited position. Specifically, Wellington Management Group LLP reported shared voting power over 3,017,643 shares and shared dispositive power over the full 3,576,062 shares. The securities are held in the ordinary course of business for various investment advisory clients. The filing includes a joint filing agreement among the entities, which are classified as parent holding companies and investment advisers. The certification confirms that the acquisition was not intended to influence or change the control of the issuer.