Clean Harbors CLH Institutional Ownership

Ownership Summary

Clean Harbors Inc (NYSE:CLH) showed up in the 13F filings of 615 institutional investors as of March 2026.

• They owned 98.1% of outstanding stock in March 2026, up from 97.2% the prior quarter.
• They increased total shares held in Clean Harbors by 13.83% from the prior quarter, while the number of investors in CLH increased 8.47% year over year.
• Of these 615 holders, 327 added to their stakes in Clean Harbors, 193 trimmed positions, and 95 made no changes.
• Institutional investors collectively held 51.82Mn shares in Clean Harbors as of March 2026, up by 6.3Mn shares quarter on quarter, and up 1.17Mn shares year over year.
• BlackRock, Inc. holds the largest position in CLH at 4.8Mn shares as of March 31, 2026, or 9.09% of shares outstanding.
• The largest buyers of Clean Harbors for the quarter ending March 2026 were Janus Henderson Group Plc (2.33Mn), VANGUARD CAPITAL MANAGEMENT LLC (2.17Mn), VANGUARD PORTFOLIO MANAGEMENT LLC (1.96Mn), FMR LLC (1.73Mn), T. Rowe Price Investment Management, Inc. (412.54K).
• Leading sellers of Clean Harbors shares for the quarter ending March 2026 were WELLINGTON MANAGEMENT GROUP LLP (1.61Mn), D1 Capital Partners L.P. (1.44Mn), Pictet Asset Management Holding SA (643.59K), NORDEA INVESTMENT MANAGEMENT AB (472.19K), UBS Group AG (329.9K).
• Business Quant data shows the 10 biggest positions in Clean Harbors as of March 2026 are held by BlackRock, Inc. (4.8Mn), Janus Henderson Group Plc (4.71Mn), WELLINGTON MANAGEMENT GROUP LLP (3.58Mn), VANGUARD CAPITAL MANAGEMENT LLC (2.17Mn), FMR LLC (2.1Mn), VANGUARD PORTFOLIO MANAGEMENT LLC (1.96Mn), LONE PINE CAPITAL LLC (1.75Mn), State Street Corp (1.54Mn), D1 Capital Partners L.P. (1.34Mn), Pictet Asset Management Holding SA (1.24Mn).