Clean Harbors Inc (CLH) is gone from Stephen Mandel's Lone Pine Capital portfolio as of June 30, 2026, according to the 13F-HR filed with the SEC on August 14, 2026. A quarter earlier the position was 1.75M shares worth about $503.2M, or 4.01% of the reported book. CLH had been in the portfolio for 2 quarters, since the quarter ended December 31, 2025.
What did the 2026 Q2 filing report for CLH?
As of June 30, 2026, from the 13F-HR filed August 14, 2026.
| Before | After | |
|---|---|---|
| Shares | 1.75M | 0 |
| Reported value | $503.2M | $0 |
| Portfolio weight | 4.01% | 0% |
| Held since | 2025 Q4 | sold out in 2026 Q2 |
| Quarters held | 2 |
What did Stephen Mandel sell?
Stephen Mandel sold 1.75M shares of CLH between the quarter ended March 31, 2026 and June 30, 2026. The CLH exit was the 10th largest of the quarter's 49 position changes by percent change to portfolio.
Where does CLH sit in the Stephen Mandel portfolio?
Before the sale, CLH carried 4.01% of the Stephen Mandel portfolio, above the fund's average stock position of 3%. The largest stock position is NBIS at 7.19%. Next come ASML at 6.92% and STX at 5.9%. The three largest stocks together are 20.01% of the book. Across the 2026 Q2 portfolio, Stephen Mandel reported 34 stock positions, with 13 opened and 15 closed. The total portfolio value is about $16.4B, up 30% from the prior quarter.
How long has Stephen Mandel held CLH?
Stephen Mandel held CLH for 2 quarters, from the quarter ended December 31, 2025 to March 31, 2026. The weight peaked at 4.01% in 2026 Q1. Last quarter the fund had added to the position by 27%. Every reported trade is on the Stephen Mandel CLH trade history page.
FAQ
How many CLH shares did Stephen Mandel sell?
Stephen Mandel sold all 1.75M shares of CLH it reported a quarter earlier, worth about $503.2M.
When did Stephen Mandel first buy CLH?
Stephen Mandel first reported CLH in the quarter ended December 31, 2025.
How much of the Stephen Mandel portfolio was CLH?
CLH was 4.01% of the Stephen Mandel portfolio at the prior quarter-end, and 0% after the sale.