Free cash flow margin recovered from -8.8% in 2026Q2 to 13.2% in 2026Q3, but capex-to-revenue of 9.2% and net acquisition outflows of $331.5M suggest recent cash generation may be timing-influenced rather than a stable run-rate.
Clean Harbors, Inc. (CLH) cash flow statement — 30-year operating, investing & financing cash flows
| Metric | TTM | Dec'25 | Dec'24 | Dec'23 | Dec'22 | Dec'21 | Dec'20 | Dec'19 | Dec'18 | Dec'17 | Dec'16 | Dec'15 | Dec'14 | Dec'13 | Dec'12 | Dec'11 | Dec'10 | Dec'09 | Dec'08 | Dec'07 | Dec'06 | Dec'05 | Dec'04 | Dec'03 | Dec'02 | Dec'01 | Dec'00 | Dec'99 | Dec'98 | Dec'97 | Dec'96 |
|---|
| Cash from Operations | 754.69M | 866.73M | 777.77M | 734.55M | 626.21M | 546M | 430.6M | 413.19M | 373.21M | 285.7M | 259.62M | 396.38M | 297.37M | 415.84M | 324.37M | 179.53M | 224.11M | 93.27M | 109.59M | 80M | 61.38M | 29.67M | 52.46M | 38.86M | 5.65M | 24.63M | 13.57M | 6.1M | 3.9M | -1.5M | 5.2M |
| Operating CF Margin % | - | 14.37% | 13.21% | 13.58% | 12.12% | 14.35% | 13.7% | 12.11% | 11.31% | 9.7% | 9.42% | 12.1% | 8.74% | 11.85% | 14.83% | 9.05% | 12.94% | 8.68% | 10.63% | 8.45% | 7.4% | 4.17% | 8.16% | 6.36% | 1.61% | 9.79% | 5.81% | 3.01% | 1.98% | -0.82% | 2.6% |
| Operating CF Growth % | 235.53% | 11.44% | 5.88% | 17.3% | 14.69% | 26.8% | 4.21% | 10.71% | 30.63% | 10.04% | -34.5% | 33.3% | -28.49% | 28.2% | 80.67% | -19.89% | 140.28% | -14.89% | 37% | 30.32% | 106.9% | -43.45% | 35.01% | 587.86% | -77.07% | 81.53% | 122.44% | 56.41% | 360% | -128.85% | -28.77% |
| Net Income | 528.36M | 390.97M | 402.3M | 377.86M | 411.74M | 203.25M | 134.84M | 97.74M | 65.64M | 100.74M | -39.87M | 44.1M | -28.33M | 95.57M | 129.67M | 127.25M | 130.51M | 36.69M | 57.49M | 44.2M | 46.67M | 25.62M | 2.6M | -17.34M | -28.19M | 5.54M | 7.12M | -2.2M | -3.9M | -13.7M | -6.9M |
| Depreciation & Amortization | 463.32M | 446.01M | 400.92M | 365.76M | 347.59M | 298.13M | 292.92M | 300.73M | 298.63M | 288.42M | 287M | 274.19M | 276.08M | 264.45M | 161.65M | 122.66M | 92.47M | 64.9M | 44.47M | 37.59M | 36.95M | 30.3M | 26.46M | 28.95M | 16.8M | 11.99M | 10.66M | 9.8M | 9.6M | 10M | 10.5M |
| Stock-Based Compensation | 46.22M | 32.7M | 27.98M | 20.7M | 26.84M | 18.84M | 18.5M | 17.82M | 16.79M | 13.15M | 10.48M | 8.55M | 8.8M | 8.95M | 7.49M | 8.16M | 7.22M | 968K | 3.56M | 4.8M | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| Deferred Taxes | 25.76M | 25.76M | 18.44M | 12.69M | 17.55M | 1.48M | -9.75M | 8.01M | 19.09M | -83.33M | 16.35M | 1.85M | 33.14M | 32.52M | 36.71M | 41.18M | 6.66M | 4.83M | 3.2M | -7.49M | -6.38M | -1.24M | 381K | -620K | 1.68M | 1.35M | 0 | 0 | 100K | 4.6M | -2.3M |
| Other Non-Cash Items | -241.65M | 4.82M | 6.35M | 1.36M | 10.44M | 12M | 26.81M | -133K | 28.5M | -9.04M | 14.44M | 20.3M | 117.36M | 10.12M | -3.14M | -8.55M | -10.12M | 1.93M | -1.29M | 5.96M | 6.88M | -267K | 19.54M | 15.31M | 26.76M | 527K | -1.44M | 700K | 600K | 600K | 600K |
| Working Capital Changes | -67.32M | -33.54M | -78.22M | -43.82M | -187.96M | 12.3M | -32.72M | -10.96M | -55.43M | -24.23M | -28.78M | 47.39M | -109.69M | 4.24M | -8.02M | -111.18M | -2.63M | -16.04M | 2.16M | -5.06M | -22.75M | -24.75M | 3.48M | 12.56M | -11.39M | 5.23M | -2.76M | -2.2M | -2.5M | -3M | 3.3M |
| Change in Receivables | -195.66M | -31.85M | -28.82M | 2.45M | -201.09M | -96.55M | 22.42M | -33.27M | -79.56M | -33.76M | -15.01M | 55.27M | -14.34M | -54.21M | 60.55M | -65.21M | -49.41M | -11.43M | 17.22M | -19.14M | -10.66M | -27.55M | -1.63M | 24.8M | -19.37M | 69K | -4.11M | -1.7M | -4.1M | 4.2M | 4.1M |
| Change in Inventory | -31.58M | 12.46M | -49.59M | -4.31M | -74.55M | -31.69M | -7.93M | -15.87M | -26.96M | -5M | -16.08M | 14.06M | -21.34M | -1.14M | -12.87M | -11.7M | -3.13M | 0 | 0 | 25.2M | -2.54M | -2.39M | -1.26M | 705K | 456K | -736K | -571K | -200K | 0 | 100K | 100K |
| Change in Payables | 81.39M | 23.38M | 12.33M | -27.43M | 74.46M | 108.4M | -80.33M | 7.15M | 46.91M | -10.68M | -3.5M | -16.3M | -52.03M | 37.12M | 5.93M | -8.12M | 38.55M | 5.05M | -17.76M | -4.6M | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| Cash from Investing | -1.2B | -425.79M | -903.67M | -575.05M | -388.94M | -1.51B | -199.46M | -217.86M | -349.66M | -203.27M | -361.78M | -350.64M | -258.29M | -345.51M | -1.57B | -480.18M | -125.69M | -118.39M | -84.52M | -42.79M | -98.89M | -3.51M | 47.63M | -53M | -115.74M | -7.5M | -6.96M | -6.1M | -6.4M | 5.6M | -2.7M |
| Capital Expenditures | -519.23M | -424.92M | -432.24M | -422.3M | -345.06M | -241.86M | -196.26M | -216.32M | -193.34M | -167.01M | -219.38M | -257.2M | -257.61M | -280.21M | -197.4M | -148.51M | -116.45M | -62.24M | -57.46M | -36.53M | -43.02M | -19.45M | -26.34M | -34.83M | -12.46M | -7.28M | -7.4M | -7M | -4.5M | -3.4M | -3.1M |
| CapEx % of Revenue | 7.91% | 7.05% | 7.34% | 7.81% | 6.68% | 6.36% | 6.24% | 6.34% | 5.86% | 5.67% | 7.96% | 7.85% | 7.57% | 7.98% | 9.02% | 7.49% | 6.73% | 5.79% | 5.58% | 3.86% | 5.18% | 2.74% | 4.1% | 5.7% | 3.56% | 2.89% | 3.17% | 3.45% | 2.28% | 1.85% | 1.55% |
| Acquisitions | -684.77M | 4.28M | -477.26M | -118.85M | -69.47M | -1.25B | -1.13M | -24.65M | -151.02M | -3.8M | -159.78M | -94.34M | -16.19M | -63.26M | -1.37B | -336.96M | -14.65M | -54.48M | -27.63M | -7.41M | -51.49M | 0 | 0 | 7.89M | -44.22M | 0 | 0 | 0 | 0 | 0 | 0 |
| Investments | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - |
| Other Investing | 9.85M | 17.92M | -508K | 7M | 6.81M | 18.31M | 7.59M | 7.75M | 10.76M | 5.51M | 17.99M | 899K | 1.65M | -2.04M | 9.2M | 3.87M | 13.19M | -1.78M | -1.25M | 257K | 2.39M | -885K | 1.96M | -32.63M | -59.85M | -228K | -712K | -300K | -2.1M | 1.7M | -300K |
| Cash from Financing | -197.96M | -309.34M | 377.03M | -208.89M | -187.31M | 898.25M | -88.95M | -53.42M | -111M | -72.76M | 220.24M | -90.18M | -93.94M | 13.13M | 1.22B | 258.74M | -32.23M | 3.58M | 116.8M | 2.72M | -20.33M | 75.02M | -75.78M | 5.87M | 117.09M | -13.04M | -6.76M | 900K | 500K | -1.6M | -1.4M |
| Debt Issued (Net) | 67.32M | -38.01M | 453.39M | -146.65M | -128.47M | 979.01M | -14.18M | -18.2M | -62.78M | -9.03M | 250.63M | -511K | -7.12M | -4.89M | 842.27M | 253.41M | -35.13M | 7.21M | -66.46M | -7.37M | -30.59M | -380K | -35.39M | 8.82M | 99.44M | -14.5M | -7.07M | 700K | 400K | -1.7M | -1M |
| Equity Issued (Net) | -202.72M | -242.84M | -55.18M | -51.16M | -50.18M | -54.41M | -74.84M | -21.39M | -45.08M | -48.97M | -22.19M | -73.35M | -107.13M | -731K | 366.61M | -4.06M | 3.31M | 1.9M | 174.88M | 1.17M | 3.15M | 77.74M | -24.13M | 1.06M | 23.36M | 297K | 310K | 100K | 100K | 200K | 200K |
| Dividends Paid | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | -206K | -276K | -279K | -2.19M | -974K | -536K | -224K | 0 | 0 | 0 | 0 | 0 |
| Share Repurchases | -210.13M | -250M | -55.18M | -51.16M | -50.18M | -54.41M | -74.84M | -21.39M | -45.08M | -48.97M | -22.19M | -73.35M | -107.13M | -731K | -2.91M | -4.06M | -399K | -415K | -483K | 0 | 0 | 0 | -25M | 0 | -2.89M | 0 | 0 | 0 | 0 | 0 | 0 |
| Other Financing | -62.55M | -28.49M | -21.18M | -11.08M | -8.66M | -26.35M | 73K | -13.84M | -3.13M | -14.76M | -8.2M | -16.32M | 20.31M | 18.75M | 8.98M | 9.39M | -415K | -5.53M | 8.38M | 9.13M | 7.38M | -2.06M | -14.07M | -3.04M | -5.17M | 1.39M | 0 | 100K | 0 | -100K | -600K |
| Net Change in Cash | -640.86M | 139.12M | 242.49M | -47.91M | 40.03M | -66.53M | 147.11M | 145.48M | -92.89M | 12.4M | 122.29M | -62.17M | -63.19M | 80.24M | -30.89M | -41.49M | 68.66M | -15.98M | 129.99M | 45.99M | -58.9M | 101.37M | 24.75M | -7.35M | 6.97M | 4.09M | -154K | 900K | -2M | 2.5M | 1.1M |
| Free Cash Flow | 233.34M | 438.16M | 345.53M | 309.6M | 279.19M | 300.29M | 232.31M | 192.96M | 175.18M | 117.07M | 37.41M | 133.89M | 33.23M | 128.89M | 122.92M | 28.09M | 103.45M | 28.8M | 52.13M | 43.47M | 18.37M | 10.21M | 26.12M | 4.03M | -6.81M | 17.36M | 6.17M | -900K | -600K | -4.9M | 2.1M |
| FCF Margin % | 3.55% | 7.27% | 5.87% | 5.72% | 5.4% | 7.89% | 7.39% | 5.66% | 5.31% | 3.98% | 1.36% | 4.09% | 0.98% | 3.67% | 5.62% | 1.42% | 5.98% | 2.68% | 5.06% | 4.59% | 2.21% | 1.44% | 4.06% | 0.66% | -1.95% | 6.9% | 2.64% | -0.44% | -0.3% | -2.67% | 1.05% |
| FCF Growth % | -47.32% | 26.81% | 11.6% | 10.89% | -7.03% | 29.26% | 20.39% | 10.15% | 49.63% | 212.96% | -72.06% | 302.87% | -74.22% | 4.86% | 337.58% | -72.85% | 259.24% | -44.76% | 19.93% | 136.67% | 79.85% | -60.9% | 548.87% | 159.1% | -139.25% | 181.46% | 785.11% | -50% | 87.76% | -333.33% | 136.84% |
| FCF per Share | 4.41 | 8.21 | 6.38 | 5.69 | 5.12 | 5.48 | 4.17 | 3.44 | 3.11 | 2.05 | 0.65 | 2.29 | 0.55 | 2.12 | 2.27 | 0.53 | 1.95 | 0.58 | 1.14 | 1.05 | 0.44 | 0.29 | 0.93 | 0.15 | -0.28 | 0.68 | 0.27 | -0.04 | -0.03 | -0.25 | 0.12 |
| FCF Conversion (FCF/Net Income) | 0.44x | 2.22x | 1.93x | 1.94x | 1.52x | 2.69x | 3.19x | 4.23x | 5.69x | 2.84x | -6.51x | 8.99x | -10.50x | 4.35x | 2.50x | 1.41x | 1.72x | 2.54x | 1.91x | 1.81x | 1.32x | 1.16x | 20.18x | -2.24x | -0.20x | 4.45x | 1.91x | -2.77x | -1.00x | 0.11x | -0.75x |
| Interest Paid | 100.82M | 157.26M | 153.06M | 114.56M | 105.64M | 73.44M | 72.53M | 60.85M | 89.17M | 93.17M | 88.67M | 73.93M | 75.41M | 75.63M | 41.82M | 31.2M | 26.98M | 7.83M | 13.66M | 14.65M | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| Taxes Paid | 66.13M | 117.9M | 130.61M | 132.31M | 78.53M | 65.19M | 53.12M | 27.04M | 20.04M | 18.68M | 29.25M | 52.97M | 42.02M | 8.16M | 13.18M | 48.73M | 56.02M | 14.61M | 36.52M | 13.94M | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
Quick answers to the most common questions about buying CLH stock.
Clean Harbors, Inc. (CLH) generated $866.7M in net cash from operating activities in 2025. This reflects the cash generated directly from core business operations.
Clean Harbors, Inc. (CLH) generated $438.2M in free cash flow in 2025. Free cash flow is the cash left over after capital expenditures, which can be used to pay dividends, repurchase shares, or pay down debt.
Clean Harbors, Inc. (CLH) spent $424.9M on capital expenditures in 2025. CapEx represents the cash invested in physical assets like property, plant, and equipment to maintain or grow the business.
In 2025, Clean Harbors, Inc. (CLH) spent $250.0M on share repurchases. This shows the company's commitment to returning capital to its equity investors.
Key Metrics
Top Statement Risk
Acquisition-driven cash outflows and volatile operating cash
Metrics are mathematically derived from official filings.
Cash Conversion Swings Between Extremes
According to reported quarterly cash flow statements, CLH's operating cash flow to net income ratio ranged from -0.15 in 2026Q2 to 4.10 in 2025Q4, a spread too wide to treat any single quarter as representative of earnings quality.
The conversion ratio is volatile because working capital swings of -$185.1M in 2026Q1 and +$125.2M in 2025Q4 dominate the operating cash line far more than reported profit does. Over the ten quarters shown, cumulative operating cash flow appears to track net income only loosely, which suggests accrual quality and receivable timing warrant closer monitoring than the headline earnings alone would imply. Investors should monitor whether the strong late-2025 and Q3 2026 conversion reflects durable collections or a timing reversal.
Free Cash Flow Recovering From Trough
Based on reported figures, CLH's free cash flow margin moved from -8.8% in 2026Q2 to 13.2% in 2026Q3, but the recent quarters are strongly influenced by working capital release rather than a clearly stable run-rate.
Free cash flow turned negative in several quarters, including -$151.9M in 2026Q2 and -$117.1M in 2025Q1, indicating that cash generation has been inconsistent across the period. The recovery to $246.4M in 2026Q3 coincides with a $72.5M working capital inflow and a capex-to-revenue ratio of 9.2%, which may suggest the latest quarter is flattered by timing. Further investigation into the sustainability of operating inflows would clarify whether this trajectory is structural.
Capital Intensity Elevated Relative to History
As reported in financial statements, CLH's capex-to-revenue ratio rose to 9.2% in 2026Q3 and 8.3% in 2025Q1, compared with 4.4% in 2024Q4, pointing to a materially heavier reinvestment burden in recent periods.
Capital expenditures of $172.8M in 2026Q3 against depreciation and amortization of $122.7M suggest the company is spending above its depreciation base, which may reflect growth or capacity investment rather than pure maintenance. Because the data does not separate maintenance from growth capex, the split cannot be verified from the supplied figures. Investors should monitor whether capital intensity moderates as the company integrates recent investments.
Acquisitions Dominate Recent Capital Deployment
According to reported cash flow data, CLH's net acquisition outflows reached $331.5M in 2026Q3 and $225.8M in 2026Q2, while dividends were nil and buybacks remained at modest levels across the period.
Cash deployment has been directed primarily toward acquisitions rather than shareholder distributions, with no dividends paid across the ten quarters shown. Repurchases of $25M to $133M per quarter appear modest relative to acquisition spending, which suggests management is prioritizing growth through M&A. The returns generated by these acquisitions are not visible in the supplied data and warrant further investigation.
Strong Quarters May Reflect Timing
Based on the supplied cash flow figures, the strongest recent quarters coincide with large working capital inflows, which may mean the apparent cash generation overstates underlying operating cash power.
The 2025Q4 and 2026Q3 operating cash flows of $355.1M and $419.2M each relied on working capital contributions of $125.2M and $72.5M, respectively, implying that a meaningful share of recent strength may be timing-related. Peer context shows CECO and NVRI with negative or weak free cash flow margins, which provides limited comparison but does not validate CLH's recovery. Investors should monitor whether working capital inflows reverse in subsequent periods.