Clean Harbors Reports 21% Revenue Growth in Third Quarter Ended September 30
Key Facts
Clean Harbors reported a 21% increase in revenue in the third quarter ended September 30, 2026, according to results published by the company via Business Wire. Co-Chief Executive Officer Eric Gerstenberg said the results reflected the company’s strong market position and strong demand for its environmental services and sustainable products. The statement offers the company’s explanation for the quarter’s performance, while the available results summary did not detail how revenue was distributed between the two businesses or how much each contributed to growth. The announcement followed an annual revenue increase in the second quarter as well, although at a slower pace. The results were also released as the company expanded through two acquisitions completed in October.
In the second quarter of 2026, revenue rose 12% to $1.74 billion, compared with $1.55 billion in the same period of 2025, according to the company’s results. That means the reported 21% growth in the third quarter followed an annual increase in the previous quarter, but the available third-quarter figures here are limited to the growth rate and do not include a revenue figure. Second-quarter net income rose 34% to $170.5 million, or $3.22 per diluted share, compared with $126.9 million and $2.36 per share a year earlier. These results provide context on the company’s performance before the third quarter, but do not establish net income or earnings per share for the latest quarter.
Gerstenberg linked third-quarter performance to Clean Harbors’ strong market position and demand for its environmental services and sustainable products, according to his statement published with the results. He said: "Our third-quarter results reflect our strong market position and strong demand for our environmental services and sustainable products." The statement identifies the two areas of demand cited by management in describing performance, without providing separate figures for either business. The available results summary also did not specify how much demand or market position contributed to revenue growth, and does not allow a comparison of growth in demand for sustainable products with an earlier period. Management’s explanation therefore remains tied to the reported result: revenue growth of 21% during the quarter.
The company expanded in October through two acquisitions with announced total spending of $775 million. Clean Harbors disclosed to the U.S. Securities and Exchange Commission that it completed the ES&H deal on September 18, 2026, then completed the EnviroServe deal on October 2, 2026. The ES&H deal was therefore completed before the quarter ended on September 30, while the EnviroServe deal closed afterward. The deals form part of the backdrop to the period surrounding the results, but the available information does not attribute any portion of the reported revenue growth to them or break out their financial impact on the third quarter.
In the market, Clean Harbors shares, listed under ticker CLH, closed at $312.92 on October 27, 2026, according to EL7 data. That was the day before the results announcement dated October 28, so the closing price provides context from before the announcement and does not reflect the stock’s response to it. The market data provided does not include the share-price move after the results were published or a comparison with the previous session’s close. In its second-quarter results, the company had forecast adjusted EBITDA growth of between 24% and 28% year over year in the third quarter of 2026; the available facts here do not include an actual figure for comparison.