Clean Harbors heads into the week after its May 6 earnings release with the stock up 2.5% on the week, shorts in retreat, and a string of analyst upgrades that began well before the print.
The most compelling story here is on the Street side. Analyst activity over the past several weeks has been unusually coordinated in one direction — upward. Citigroup upgraded the stock to Buy in early April, lifting its target from $302 to $346. Baird followed by raising its Outperform target from $300 to $350. Truist Securities, already at Buy, pushed its target to $325 from $310 as recently as April 20. Goldman Sachs, though maintaining Neutral, still nudged its target up to $306 from $268. The mean price target now sits at $318, in line with the current price of $313.70 — a sign that conviction bulls have already priced in a good deal of the upside, while the sideline holders are gradually moving their goalposts higher. The analyst recommendation factor score ranks in the 93rd percentile, reflecting how far the Street has tilted toward positive sentiment.
The forward earnings picture reinforces that bullish lean. The 12-month forward EPS growth estimate ranks in the 87th percentile, and EPS momentum over 90 days is in the 75th percentile. The bull case centres on PFAS remediation services growing 20% year-over-year, contributions from the recently acquired Kimball business, and an expansion into Group III base oil. Bears point to margin pressures in the Safety-Kleen segment and the ongoing cost of sustainability investments. At a trailing P/E near 36x and EV/EBITDA of around 14.7x, the stock is not cheap — but neither has valuation been the driver of recent moves, with the EV/EBITDA multiple actually slipping modestly over the past 30 days even as the stock climbed.
Short interest tells a quiet story. At 1.4% of the free float — and falling — there is little conviction among bears in the lending market. Short positions have dropped roughly 9% over the past month, from a peak near 934,000 shares in late March to around 762,000 now. The short score of 29.6 is low and drifting lower. Borrow is essentially free at 0.40% annualised cost, and availability in the lending pool remains wide open, meaning nothing in the positioning data flags any squeeze dynamic or unusual hedging pressure. Options sentiment is similarly muted — the put/call ratio of 0.83 is running just fractionally above its 20-day average of 0.82, a z-score of essentially zero, suggesting no meaningful tilt toward either puts or calls at this stage.
On ownership, the most notable recent move is founder Alan McKim trimming his stake by 211,265 shares as of mid-March — a meaningful reduction from a 4.2% holder. Several other executives also sold smaller amounts around the same period, including the President/CEO, CFO, and Co-CEO. These look like scheduled or post-lockup sales rather than a directional signal, given their modest trade-significance scores. The bigger institutional picture remains stable: Wellington, BlackRock, and Vanguard collectively hold nearly 27% of shares, with BlackRock adding 66,859 shares as recently as April 30.
What to watch is whether the Q1 earnings release — filed today — delivers a revenue and free cash flow trajectory that justifies the 36x earnings multiple and closes the gap between the current price and the most ambitious analyst targets clustered in the $346–$350 range, while the Safety-Kleen margin question remains the key variable bears will use to test whether the bull case holds.
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