24th Annual Needham Growth Conference January 11, 2022 40 YEARS OF SUSTAINABILITY IN ACTION 1 Forward Looking Statements and GAAP Disclaimer These slides contain (and the accompanying oral discussion will contain) forward-looking statements, which are generally identifiable by use of the words "believes," "expects," "intends," "anticipates," "plans to," "seeks," "should," "estimates," "projects," "may," "likely" or similar expressions. Such statements may include, but are not limited to, statements about fu ...

Company Overview - Clean Harbors is a market leader in hazardous waste disposal and recycling with high barriers to entry and growth potential beyond GDP[5] - The company owns more than 500 hard-to-replicate permits and operates 100+ waste management facilities[5] - Clean Harbors serves 300,000+ customers with 19,000+ employees across ~700 service locations[5] Market and Strategy - Clean Harbors targets large market opportunities including Hazardous Waste Management ($11 billion), Remediation & Industrial Services ($14 billion), and the U S Lubricants Industry ($15 billion)[9] - The company's growth strategies include expanding offerings and geographic coverage, executing cost, pricing, and productivity initiatives, pursuing acquisitions and divestitures, adding network capacity, and cross-selling across businesses[18] - Clean Harbors acquired HydroChemPSC (HPC) in an all-cash transaction for $125 billion, expecting $40 million+ of synergies after the first full year of operation[19] Financial Performance - In Q3 2021, Clean Harbors reported revenue of $9515 million, a 22% increase year-over-year (YoY)[23] - Q3 2021 adjusted EBITDA increased 10% to $1851 million with an adjusted EBITDA margin of 195%[23] - The company's adjusted free cash flow was $611 million in Q3 2021 and is on track to hit its annual target[23]

BofA Securities Leveraged Finance Conference 2021 1 November 30, 2021 40 YEARS OF SUSTAINABILITY IN ACTION Forward Looking Statements and GAAP Disclaimer These slides contain (and the accompanying oral discussion will contain) forward-looking statements, which are generally identifiable by use of the words "believes," "expects," "intends," "anticipates," "plans to," "seeks," "should," "estimates," "projects," "may," "likely" or similar expressions. Such statements may include, but are not limited to, statem ...

Third Quarter 2021 Investor Review November 3, 2021 1 40 YEARS OF SUSTAINABILITY IN ACTION Forward Looking Statements and GAAP Disclaimer These slides contain (and the accompanying oral discussion will contain) forward-looking statements, which are generally identifiable by use of the words "believes," "expects," "intends," "anticipates," "plans to," "seeks," "should," "estimates," "projects," "may," "likely" or similar expressions. Such statements may include, but are not limited to, statements about futur ...

Financial Data and Key Metrics Changes - Revenue increased by 22% in Q3 2021, driven by over $75 million growth in each segment, with almost all growth being organic [28] - Adjusted EBITDA grew 10% year-over-year, reaching $185.1 million, with a strong EBITDA margin of 19.5% [29] - Adjusted free cash flow for Q3 was $61.1 million, with expectations for full-year adjusted free cash flow in the range of $310 million to $330 million [33][39] Business Line Data and Key Metrics Changes - Environmental Services revenue grew by 15%, driven by favorable mix and pricing in the disposal network, with industrial services growing by 24% [10] - Safety-Kleen Sustainability Solutions (SKSS) revenue surged by 60% to nearly $206 million, with adjusted EBITDA increasing by over $41 million year-over-year [17] - Average incineration price increased by 18% year-over-year, with a notable 11% increase in U.S. incinerators [14] Market Data and Key Metrics Changes - Incineration utilization was at 82%, up from the previous year, with deferred revenue reaching a record high of $86.6 million [13] - Landfill volumes declined by 5%, but average pricing per ton increased by 17% [16] - Waste oil collections exceeded 60 million gallons for the first time since the pandemic began [18] Company Strategy and Development Direction - The company completed the acquisition of HydroChemPSC, expecting at least $40 million in synergies after the first full year of operation [19] - Continued investment in capital expenditures, particularly in disposal, with plans for a new incinerator in Kimball, Nebraska [21][22] - The company is focusing on aggressive pricing initiatives across all business lines to offset rising costs [44] Management's Comments on Operating Environment and Future Outlook - Management acknowledged economic headwinds, including higher supply chain, labor, and transportation costs, but expressed confidence in the company's ability to address these challenges through pricing and cost mitigation strategies [9][26] - The company is optimistic about closing out 2021 strongly and expects to perform well in Q4 and into 2022, driven by market demand [24][26] Other Important Information - Government assistance programs in the Environmental Services segment decreased significantly, from $11.2 million in Q3 2020 to $1.1 million in Q3 2021 [12] - The company is evaluating opportunities for debt reduction following the acquisition of HydroChemPSC [23] Q&A Session Summary Question: Can you discuss the acceleration of pricing initiatives? - Management indicated that pricing needs to come from all business lines, with transportation costs being a significant challenge [43][44] Question: What is the expected pricing cadence for incineration? - Incineration pricing in Q3 was up 11%, with expectations for continued price expansion as contracts come up for renewal [51] Question: How is the integration of HydroChem going? - The integration is proceeding smoothly, with a focus on rationalizing contracts and leveraging synergies [49] Question: What are the expectations for re-refining margins post-IMO 2020? - Management anticipates that while base oil pricing may decline, effective spread management will help maintain profitability [55] Question: What are the labor challenges and how is the company addressing them? - The company is actively recruiting from various sources, including military personnel, and is focused on training and onboarding to fill open positions [72] Question: What is the status of the Vertex Energy acquisition? - The company is responding to a second request from the Federal Trade Commission and continues to operate as a standalone entity until the acquisition closes [96]

Table of Contents Title of each class Trading Symbol Name of each exchange on which registered Common Stock, $0.01 par value CLH New York Stock Exchange UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 _______________________ FORM 10-Q ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 FOR THE QUARTERLY PERIOD ENDED SEPTEMBER 30, 2021 OR ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 FOR THE TRANSITION ...

Clean Harbors Inc. (NYSE:CLH) Q2 2021 Earnings Conference Call August 4, 2021 9:00 AM ET Company Participants Michael McDonald - General Counsel Alan McKim - Chairman, President and Chief Executive Officer Mike Battles - Executive VP and CFO Conference Call Participants Tyler Brown - Raymond James Noah Kaye - Oppenheimer Michael Hoffman - Stifel Ryan Gunning - Jefferies Jeff Silber - BMO Capital Markets Adam Bubes - Goldman Sachs Larry Solow - CJS Securities David Manthey - Baird Jim Ricchiuti - Needham Al ...

Second Quarter 2021 Investor Review August 4, 2021 1 40 YEARS OF SUSTAINABILITY IN ACTION Forward Looking Statements and GAAP Disclaimer These slides contain (and the accompanying oral discussion will contain) forward-looking statements, which are generally identifiable by use of the words "believes," "expects," "intends," "anticipates," "plans to," "seeks," "should," "estimates," "projects," "may," "likely" or similar expressions. Such statements may include, but are not limited to, statements about future ...

PART I: FINANCIAL INFORMATION [Unaudited Financial Statements](index=3&type=section&id=ITEM%201%3A%20Unaudited%20Financial%20Statements) Unaudited financial statements for Q2 2021 reflect strong revenue and net income growth, with total assets at **$4.28 billion**, following a Q1 segment reorganization - In Q1 2021, the company reorganized its business into two new reportable segments: **Environmental Services** and **Safety-Kleen Sustainability Solutions**, with historical data recast[24](index=24&type=chunk)[25](index=25&type=chunk)[92](index=92&type=chunk) [Consolidated Balance Sheets](index=3&type=section&id=Consolidated%20Balance%20Sheets) As of June 30, 2021, total assets increased to **$4.28 billion**, driven by higher cash and receivables, while total stockholders' equity rose to **$1.41 billion** Consolidated Balance Sheet Highlights (in thousands) | Account | June 30, 2021 | December 31, 2020 | | :--- | :--- | :--- | | **Total Current Assets** | $1,677,316 | $1,525,722 | | **Total Assets** | **$4,275,879** | **$4,131,520** | | **Total Current Liabilities** | $711,069 | $636,145 | | **Total Liabilities** | $2,866,292 | $2,789,969 | | **Total Stockholders' Equity** | **$1,409,587** | **$1,341,551** | [Consolidated Statements of Operations](index=4&type=section&id=Unaudited%20Consolidated%20Statements%20of%20Operations) Q2 2021 total revenues increased **30.5%** to **$926.5 million**, driving net income to more than double to **$67.1 million** or **$1.22 per diluted share** Q2 2021 vs Q2 2020 Performance (in thousands, except per share) | Metric | Q2 2021 | Q2 2020 | Change (%) | | :--- | :--- | :--- | :--- | | **Total Revenues** | $926,458 | $710,000 | +30.5% | | **Income from Operations** | $110,001 | $60,220 | +82.7% | | **Net Income** | $67,075 | $29,023 | +131.1% | | **Diluted EPS** | $1.22 | $0.52 | +134.6% | Six Months 2021 vs 2020 Performance (in thousands, except per share) | Metric | Six Months 2021 | Six Months 2020 | Change (%) | | :--- | :--- | :--- | :--- | | **Total Revenues** | $1,734,606 | $1,568,563 | +10.6% | | **Income from Operations** | $160,856 | $105,716 | +52.2% | | **Net Income** | $88,811 | $40,595 | +118.8% | | **Diluted EPS** | $1.62 | $0.73 | +121.9% | [Consolidated Statements of Cash Flows](index=6&type=section&id=Unaudited%20Consolidated%20Statements%20of%20Cash%20Flows) Net cash from operating activities for the six months ended June 30, 2021, significantly increased to **$265.4 million**, driven by higher net income and improved working capital Cash Flow Summary for Six Months Ended June 30 (in thousands) | Cash Flow Activity | 2021 | 2020 | | :--- | :--- | :--- | | **Net cash from operating activities** | $265,432 | $173,486 | | **Net cash used in investing activities** | ($132,340) | ($141,685) | | **Net cash (used in) from financing activities** | ($60,534) | $47,017 | | **Increase in cash and cash equivalents** | $76,473 | $75,375 | [Notes to Financial Statements](index=8&type=section&id=Notes%20to%20Unaudited%20Consolidated%20Financial%20Statements) Notes detail accounting policies, Q1 segment reorganization, Q2 revenue disaggregation, the proposed **$1.25 billion** HydroChemPSC acquisition, and legal reserves - On August 3, 2021, the company agreed to acquire **HydroChemPSC (HPC)** for **$1.25 billion** in cash, with the acquisition expected to close later in 2021[44](index=44&type=chunk)[45](index=45&type=chunk)[117](index=117&type=chunk) - On June 29, 2021, the company agreed to acquire used motor oil collection and re-refinery assets from **Vertex Energy, Inc.** for **$140.0 million**, expanding the **Safety-Kleen Sustainability Solutions** segment[43](index=43&type=chunk) Q2 2021 Revenue by New Segment (in thousands) | Segment | Revenue | | :--- | :--- | | Environmental Services | $723,147 | | Safety-Kleen Sustainability Solutions | $203,232 | | Corporate | $79 | | **Total** | **$926,458** | Adjusted EBITDA by Segment (in thousands) | Segment | Q2 2021 | Q2 2020 | | :--- | :--- | :--- | | Environmental Services | $176,041 | $176,241 | | Safety-Kleen Sustainability Solutions | $63,314 | $8,431 | | Corporate Items | ($51,584) | ($46,406) | | **Total** | **$187,771** | **$138,266** | [Management's Discussion and Analysis (MD&A)](index=23&type=section&id=ITEM%202%3A%20Management%27s%20Discussion%20and%20Analysis%20of%20Financial%20Condition%20and%20Results%20of%20Operations) MD&A highlights strong Q2 2021 performance driven by COVID-19 recovery, with total revenues up **30.5%** and Adjusted EBITDA up **35.8%**, supported by strategic acquisitions and strong liquidity - Q2 2021 performance reflects a significant recovery from the COVID-19 pandemic, with direct revenues and Adjusted EBITDA for both segments at or above pre-pandemic levels[108](index=108&type=chunk)[111](index=111&type=chunk) - The **$1.25 billion** HydroChemPSC (HPC) acquisition will be financed with cash on hand and long-term debt, supported by a **$1.0 billion** term loan commitment[45](index=45&type=chunk)[119](index=119&type=chunk)[163](index=163&type=chunk) - Adjusted Free Cash Flow for the first six months of 2021 was **$176.9 million**, a substantial increase from **$71.9 million** in 2020, due to higher operating income and improved working capital[110](index=110&type=chunk)[159](index=159&type=chunk) - Anticipated 2021 capital spending is between **$190.0 million** and **$210.0 million**, including permitting for a new incinerator in Kimball, Nebraska, expected by early 2025[166](index=166&type=chunk) [Segment Performance](index=27&type=section&id=Segment%20Performance) Q2 2021 **Environmental Services** revenue grew **18.2%** to **$724.1 million**, while **Safety-Kleen Sustainability Solutions** revenue soared **107.8%** to **$202.3 million** with **651%** Adjusted EBITDA growth Q2 2021 vs Q2 2020 Direct Revenue by Segment (in thousands) | Segment | Q2 2021 | Q2 2020 | % Change | | :--- | :--- | :--- | :--- | | Environmental Services | $724,097 | $612,594 | +18.2% | | Safety-Kleen Sustainability Solutions | $202,282 | $97,350 | +107.8% | Q2 2021 vs Q2 2020 Adjusted EBITDA by Segment (in thousands) | Segment | Q2 2021 | Q2 2020 | % Change | | :--- | :--- | :--- | :--- | | Environmental Services | $176,041 | $176,241 | -0.1% | | Safety-Kleen Sustainability Solutions | $63,314 | $8,431 | +651.0% | [Liquidity and Capital Resources](index=33&type=section&id=Liquidity%20and%20Capital%20Resources) Strong liquidity maintained with **$666.3 million** in cash and marketable securities, **$265.4 million** in operating cash flow, and **$287.3 million** available on its revolving credit facility - As of June 30, 2021, total liquidity was approximately **$953.6 million**, comprising **$666.3 million** in cash and marketable securities and **$287.3 million** available on its revolving credit facility[160](index=160&type=chunk) - The company repurchased **0.5 million** shares for **$45.4 million** in the first six months of 2021, with **$164.4 million** remaining authorized for future repurchases[164](index=164&type=chunk) [Quantitative and Qualitative Disclosures About Market Risk](index=36&type=section&id=ITEM%203%3A%20Quantitative%20and%20Qualitative%20Disclosures%20About%20Market%20Risk) No material changes were reported in market risk exposures during the first six months of 2021 compared to the 2020 Annual Report - There were no material changes to market risk disclosures in the first six months of 2021[171](index=171&type=chunk) [Controls and Procedures](index=36&type=section&id=ITEM%204%3A%20Controls%20and%20Procedures) Management concluded that disclosure controls and procedures were effective as of June 30, 2021, with no material changes to internal control over financial reporting - The CEO and CFO concluded that disclosure controls and procedures were effective as of June 30, 2021[172](index=172&type=chunk) - No material changes occurred in internal control over financial reporting during the quarter[173](index=173&type=chunk) PART II: OTHER INFORMATION [Legal Proceedings](index=37&type=section&id=ITEM%201%3A%20Legal%20Proceedings) This section incorporates by reference legal proceedings detailed in Note 16, including matters related to the Ville Mercier facility and Superfund site liabilities - The company refers to Note 16, "Commitments and Contingencies," for details on legal proceedings[177](index=177&type=chunk) [Risk Factors](index=37&type=section&id=ITEM%201A%3A%20Risk%20Factors) A new risk factor addresses the proposed **HydroChemPSC (HPC)** acquisition, noting potential adverse effects from failure to close, including a **$50 million** termination fee - A new risk factor addresses the proposed **HydroChemPSC (HPC)** acquisition, noting that completion is subject to regulatory approval and failure to close could have adverse effects[178](index=178&type=chunk)[179](index=179&type=chunk) - Potential negative outcomes of a failed or delayed HPC acquisition include a **$50 million** termination fee, asset divestitures, and significant legal and advisory costs[180](index=180&type=chunk) [Unregistered Sales of Equity Securities and Use of Proceeds](index=37&type=section&id=ITEM%202%3A%20Unregistered%20Sales%20of%20Equity%20Securities%20and%20Use%20of%20Proceeds) In Q2 2021, the company repurchased **200,000** common shares for approximately **$18.9 million**, with **$164.4 million** remaining available under the repurchase program Common Stock Repurchases in Q2 2021 | Period | Total Shares Purchased | Avg. Price Paid per Share | Shares Purchased (Plan) | Value Remaining (in thousands) | | :--- | :--- | :--- | :--- | :--- | | Apr 2021 | 6,951 | $86.15 | — | $183,306 | | May 2021 | 242 | $88.96 | — | $183,306 | | Jun 2021 | 204,243 | $94.32 | 200,000 | $164,442 | | **Total Q2** | **211,436** | **$94.04** | **200,000** | **$164,442** | [Defaults Upon Senior Securities](index=38&type=section&id=ITEM%203%3A%20Defaults%20Upon%20Senior%20Securities) No defaults upon senior securities were reported during the period - None[187](index=187&type=chunk) [Mine Safety Disclosures](index=38&type=section&id=ITEM%204%3A%20Mine%20Safety%20Disclosures) This item is not applicable to the company - Not applicable[187](index=187&type=chunk) [Other Information](index=38&type=section&id=ITEM%205%3A%20Other%20Information) No other information was reported for this item - None[187](index=187&type=chunk) [Exhibits](index=38&type=section&id=ITEM%206%3A%20Exhibits) This section lists exhibits filed with the Form 10-Q, including CEO and CFO certifications and Interactive Data Files (iXBRL)

1 Stifel 2021 Cross Sector Insight Conference June 9, 2021 WE HELP THE ENVIRONMENT Forward Looking Statements and GAAP Disclaimer These slides contain (and the accompanying oral discussion will contain) forward-looking statements, which are generally identifiable by use of the words "believes," "expects," "intends," "anticipates," "plans to," "seeks," "should," "estimates," "projects," "may," "likely" or similar expressions. Such statements may include, but are not limited to, statements about future financ ...