Every 8-K that Clean Harbors Inc (CLH) has filed with the SEC in the last 24 months is listed below, newest first, and each one links through to the document itself with the summary and the scores our analysis gives it.
A 8-K covers material events a company has to report between its quarterly reports, so if you follow CLH and want that one kind of document rather than the whole filing history, this is the page to keep. The company's other filings, of every form, are on the full CLH filings page.
Clean Harbors, Inc. entered into a definitive agreement to acquire EnviroServe, a national environmental and waste management services provider, for $470 million in cash from an affiliate of One Rock Capital Partners. The transaction is expected to close in the second half of 2026, subject to regulatory approval and customary closing conditions, and will be funded with available cash and additional debt financing.
EnviroServe serves nearly 2,500 customers through a network of 40 locations, supported by permits in 48 states, including 18 10-day transfer facilities, several solidification facilities and railcar cleaning locations. On an adjusted basis, EnviroServe is expected to generate approximately $27 million of Adjusted EBITDA on approximately $250 million of revenues, with about 85% of revenue recurring and average tenure of the top 10 customers exceeding 16 years.
Clean Harbors anticipates approximately $25 million of cost synergies over the first two years following closing, implying a post-synergy acquisition multiple of about 9x Adjusted EBITDA. EnviroServe has more than 700 employees and a specialized fleet of over 700 vehicles, including more than 100 vacuum trucks, and reported a sub 1.0 Total Recordable Incident Rate in the most recent year.
Clean Harbors reported record second-quarter 2026 results, with revenue up 12% to $1.74 billion and net income up 34% to $170.5 million, or $3.22 per diluted share. Income from operations reached $268.9 million, while Adjusted EBITDA grew 22% to $409.0 million, lifting the margin to 23.6%.
The Environmental Services segment delivered its 17th consecutive quarter of year-over-year Adjusted EBITDA margin expansion, supported by 18% Technical Services revenue growth, 91% incineration utilization and 7% higher landfill volumes. Safety-Kleen Sustainability Solutions revenue increased 41% and Adjusted EBITDA rose 143%, aided by stronger re-refined product pricing; the unit collected 61 million gallons of waste oil.
Clean Harbors also announced a ten-year disposal contract with an estimated value of $600 million, beginning in the fourth quarter and expected to reach full capacity in 2030. It agreed to acquire ES&H for $305 million in cash, adding about $90 million of annual revenue and $30 million of Adjusted EBITDA. For 2026, management now guides to Adjusted EBITDA of $1.35-$1.41 billion and adjusted free cash flow of $520-$580 million, raising both midpoints.
Clean Harbors, Inc. reported the results of its 2026 Annual Meeting of Shareholders. As of the March 23, 2026 record date, 53,313,462 common shares were outstanding, and 50,078,328 shares were present or represented, establishing a quorum.
Shareholders elected four Class I directors — Edward G. Galante, Alison A. Quirk, Shelley Stewart, Jr., and John R. Welch — to serve until the 2029 annual meeting and until their successors are elected and qualified. Each director nominee received substantially more votes "for" than votes withheld.
On an advisory basis, shareholders approved the compensation of the company’s named executive officers, with 45,913,184 votes for, 2,642,421 against, and 16,190 abstentions, plus 1,506,533 broker non-votes. Shareholders also ratified Deloitte & Touche LLP as independent registered public accounting firm for the fiscal year ending December 31, 2026, with 47,766,968 votes for, 2,300,898 against, and 10,462 abstentions.
Clean Harbors, Inc. announced that Founder and Executive Chairman Alan S. McKim plans to retire from the Board and his role as Chief Technology Officer once the Board appoints a new Chairman. The company expects to name an independent Chair in the summer of 2026 as part of a planned leadership transition.
The company states that McKim’s decision does not result from any disagreement over operations, policies or practices. The accompanying press release highlights his role in building Clean Harbors into a leading environmental and industrial services provider with more than $6 billion in annual revenue.
Clean Harbors, Inc. has completed the all-cash acquisition of Terra Nova Solutions for $225 million, funded with available cash. Terra Nova is a Carolinas-based provider of hazardous and non-hazardous waste services operating five permitted sites with recurring revenue streams from wastewater treatment, solidification and waste processing.
Clean Harbors expects Terra Nova to generate $45 million-$50 million of annual revenue and about $15 million of Adjusted EBITDA. Management anticipates roughly $4 million of annual synergies after the first full year, implying a post-synergy acquisition multiple of 11.8x. The deal is intended to strengthen Clean Harbors’ Technical Services and Field Services businesses, expand waste-handling capacity in the Carolinas and add cross-selling opportunities.
Clean Harbors reported record first-quarter 2026 revenue of $1.46 billion, modestly above the prior year. Income from operations rose to $118.9 million, while net income increased to $63.2 million, or $1.19 per diluted share, up from $1.09 a year earlier.
Adjusted EBITDA grew 6% to $247.9 million, with margin improving to 17.0% from 16.4%, reflecting higher profitability in both Environmental Services and Safety-Kleen Sustainability Solutions. The ES segment benefited from higher disposal, PFAS-related work and strong landfill volumes, while SKSS saw better charge‑for‑oil pricing and stronger base oil prices.
The company raised its full‑year 2026 outlook, now expecting Adjusted EBITDA of $1.24 billion to $1.30 billion and adjusted free cash flow of $490 million to $550 million. Despite these improvements, adjusted free cash flow for the quarter was a negative $75.8 million, largely due to significant capital spending and growth investments.
Clean Harbors reported strong fourth-quarter and full-year 2025 results, highlighted by record annual revenues of $6.03 billion and Adjusted EBITDA of $1.17 billion. Net income for 2025 was $391.0 million, or $7.28 per diluted share, while adjusted free cash flow reached a record $509.3 million.
The company repurchased $250 million of stock in 2025 and its Board authorized a $350 million expansion of the buyback program, restoring $600 million of availability. Clean Harbors also signed an agreement to acquire certain Depot Connect International businesses for approximately $130 million, expected to add about $40 million of revenue and $11 million of Adjusted EBITDA annually.
For 2026, Clean Harbors projects Adjusted EBITDA between $1.20 billion and $1.26 billion, based on anticipated GAAP net income of $410 million to $461 million, and adjusted free cash flow between $480 million and $540 million, supported by projected net cash from operating activities of $820 million to $940 million.
Clean Harbors, Inc. filed a Form 8-K to report that it released its financial results for the third quarter ended September 30, 2025. On October 29, 2025, the company issued a press release detailing its results of operations and financial condition for this period.
The press release is furnished as Exhibit 99.1 to the Form 8-K, meaning the detailed quarterly figures and commentary are contained in that exhibit rather than in the body of the report.
Clean Harbors, Inc. entered into a major refinancing, issuing $745.0 million of 5.750% senior notes due 2033 and arranging $1,260,000,000 in new term loans under an amended credit agreement. The company used these borrowings to refinance about $1,457.3 million of existing secured senior term loans and related interest and fees. It plans to use remaining note proceeds and cash on hand to redeem all $545.0 million of its 4.875% senior notes due 2027 on October 31, 2025.
The new notes are senior unsecured, guaranteed by most domestic subsidiaries, pay 5.750% interest semi-annually and mature on October 15, 2033, with change-of-control and asset sale repurchase rights and various covenants that can fall away if investment grade ratings are achieved. The amended credit agreement adds secured New Term Loans maturing on October 9, 2032, with floating rates based on Term SOFR plus 1.50% or U.S. Base Rate plus 0.50%, and customary covenants and events of default.
Clean Harbors, Inc. reported that on September 25, 2025 it began a private offering of senior notes due 2033. The notes are being offered to institutional investors in the United States who qualify under Rule 144A of the Securities Act and to certain non-U.S. investors in offshore transactions under Regulation S.
The company also announced the pricing of this previously launched offering of 5.750% senior notes due 2033. Two related press releases, one covering the launch and one the pricing, are included as exhibits to this report. The company states that this report and the press releases do not constitute an offer to sell or a solicitation of an offer to buy the notes.