Free cash flow remains highly volatile, swinging from a 29.5% margin in 2025Q4 to 6.7% in 2026Q1, reflecting inconsistent cash conversion efficiency across recent periods.
| Metric | 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 | May'05 | May'04 | May'03 | May'02 | May'01 | May'00 | May'99 |
|---|
| Cash from Operations | 1.04B | 1.29B | 1.16B | 563.32M | 829.14M | 594.72M | 412.54M | 264.01M | 383.08M | 259.2M | 279.53M | 169.95M | 221.23M | 113.77M | 20.19M | 87.43M | 255.07M | 81.28M | 42.97M | 50.45M | 13.78M | 25.21M | 43.64M | 21.48M | 17.27M | -1.57M | 8.4M | 1.5M |
| Operating CF Margin % | 12.56% | 15.54% | 14.3% | 7.28% | 15.13% | 21.26% | 14.7% | 10.17% | 21.79% | 15.55% | 17.75% | 11.3% | 16.56% | 10.2% | 2.14% | 9.71% | 28.74% | 9.39% | 6.81% | 11.07% | 3.98% | 7.72% | 14.7% | 9.52% | 11.03% | -1.35% | 10.4% | 2.69% |
| Operating CF Growth % | -19.46% | 10.82% | 106.11% | -32.06% | 39.42% | 44.16% | 56.26% | -31.08% | 47.79% | -7.27% | 64.48% | -23.18% | 94.45% | 463.47% | -76.91% | -65.72% | 213.81% | 89.18% | -14.84% | 266.1% | -45.33% | -42.24% | 103.13% | 24.41% | 1199.94% | -118.69% | 460.13% | - |
| Net Income | 229.34M | 791.47M | 612.34M | 505.3M | 153.19M | 331.43M | 375.86M | 322.82M | 24.23M | 262.18M | 239.54M | 172.47M | 102.81M | 58.35M | 22.88M | 87.07M | 94.3M | 78.12M | 55.96M | 38.3M | 12.72M | 13.54M | 25.74M | 18.28M | 14.2M | 10.98M | 6.07M | 7.5M |
| Depreciation & Amortization | 383M | 528.29M | 585.95M | 569.51M | 314.99M | 95.07M | 61.55M | 65.92M | 191K | 59.58M | 57.68M | 52.54M | 46.51M | 42.82M | 38.68M | 33.87M | 32.66M | 27.73M | 18.89M | 14.84M | 13.88M | 13.13M | 10.6M | 7.27M | 5.97M | 4.96M | 3.23M | 2M |
| Stock-Based Compensation | 102.04M | 45.87M | 55.67M | 70.52M | 133.84M | 26.27M | 26.82M | 28.06M | 21.63M | 40.34M | 33.32M | 22.74M | 14.22M | 10.22M | 9.36M | 7.41M | 7.35M | 6.06M | 583K | 414K | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| Deferred Taxes | -128.92M | 0 | -85.4M | -124.98M | -60.62M | 50.75M | -1.54M | 45.56M | 10.73M | 1.54M | 3.16M | -7.9M | -10.58M | 10.36M | -6.12M | 2.33M | -3.4M | 2.91M | -1.18M | -1.89M | 717K | -532K | 985K | 376K | 19K | -38K | 487K | 400K |
| Other Non-Cash Items | 548.85M | -22.47M | 107.3M | 93.18M | 152.75M | -23.51M | 32.6M | -20.68M | 323.61M | -1.12M | 67K | 35K | 313K | -21.99M | 21K | -84K | 115K | 321K | 5.75M | 4.07M | -4.88M | 11.53M | 222K | 0 | 46K | 89K | 105K | -200K |
| Working Capital Changes | -98.1M | -56.51M | -114.82M | -550.22M | 135M | 114.71M | -82.74M | -177.65M | 2.69M | -103.31M | -54.23M | -69.94M | 67.95M | 14.02M | -44.63M | -43.17M | 124.04M | -33.85M | -37.04M | -5.28M | -8.64M | -12.47M | 6.09M | -4.44M | -2.97M | -17.56M | -1.49M | -8.2M |
| Change in Receivables | -169.32M | 9.39M | -78.58M | -753.29M | 95.86M | -175.04M | -101.55M | -37.56M | 57.75M | 2.53M | -62.47M | -7.03M | -43.19M | -64.8M | -32.08M | 18.27M | 25.8M | -83.82M | -9.12M | -27.8M | 5.96M | -3.55M | 8.4M | -23.23M | -14.19M | -21.62M | -3.43M | -3.02M |
| Change in Inventory | 0 | 0 | 0 | 0 | 0 | -1.63M | -69.7M | -38K | -45.19M | -62.11M | 0 | -3.37M | 0 | 0 | -12.54M | -32.63M | 60.05M | 20.43M | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| Change in Payables | 0 | 0 | 0 | 0 | 0 | 26.49M | 3.44M | -5.07M | 2.53M | 1.18M | 3.12M | -11.01M | -2.06M | 1.04M | -8.65M | -28.54M | 37.83M | 29.55M | 2.34M | 1.34M | -2.6M | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| Cash from Investing | -187.53M | -266.79M | -226.65M | -145.87M | -6.02B | -46.58M | -162.03M | -37.3M | -177.81M | -74.81M | -204.77M | -112.32M | -184.38M | -121.11M | -152.38M | 14.58M | -65.69M | -117.45M | -118.47M | -55.3M | -16.28M | -25.7M | -47.34M | -35.28M | 4.81M | -22.57M | 7.66M | -45.3M |
| Capital Expenditures | -174.21M | -168.06M | -140.69M | -142.16M | -93.75M | -51.05M | -50.65M | -48.4M | -28K | -42.6M | -49.73M | -32.78M | -29.49M | -30.79M | -35.28M | -30.95M | -33.79M | -67.88M | -75.39M | -31.52M | -12.13M | -15.6M | -13.1M | -52.66M | -10.43M | -6.69M | -7.51M | -9.4M |
| CapEx % of Revenue | 2.11% | 2.03% | 1.73% | 1.84% | 1.71% | 1.83% | 1.8% | 1.86% | 0% | 2.56% | 3.16% | 2.18% | 2.21% | 2.76% | 3.73% | 3.44% | 3.81% | 7.85% | 11.95% | 6.92% | 3.5% | 4.77% | 4.41% | 23.33% | 6.66% | 5.76% | 9.3% | 16.85% |
| Acquisitions | -2.54M | -84.16M | -71.77M | -1.91M | -5.92B | -40.21M | -119.58M | -1.65M | 89.8M | -51.04M | -166.1M | -120.77M | -92.51M | -69.94M | -61.54M | -3.69M | -25.9M | -48.99M | -41.15M | -6.77M | 0 | -10.05M | -11.26M | 0 | 0 | -1.9M | 0 | 0 |
| Investments | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - |
| Other Investing | 0 | 0 | 0 | 1.91M | -10M | 0 | 0 | 0 | -258.97M | 0 | -458K | 0 | 0 | 0 | 0 | 0 | 501K | 400K | 0 | 0 | -3.37M | -1.11M | 103K | -1.17M | -2.15M | 555K | 648K | 0 |
| Cash from Financing | -771.26M | -837.18M | -844.04M | -864.17M | 5.11B | -235.02M | -125.41M | -108.4M | -119.28M | -93.71M | -81.39M | -116.4M | 28.8M | -1.58M | -3.85M | 15.3M | -105.06M | 22.34M | 93.96M | 7.7M | 6.62M | 938K | 42.52M | -4.63M | 2.72M | 9.56M | -1.43M | 2.2M |
| Debt Issued (Net) | -29.76M | -360.28M | -895M | -800M | 5.03B | 0 | 0 | 0 | 0 | 0 | 350M | 0 | 0 | 0 | 0 | 0 | -109.88M | 9.9M | 89.83M | 112K | 4.83M | 4.83M | -7.13M | -7.13M | -5.32M | 209K | 9.29M | -1.2M |
| Equity Issued (Net) | -740.28M | -463.81M | 50.97M | -64.14M | 117.74M | -175M | -146.93M | -128.96M | -133.11M | -110M | -457.89M | -140.03M | 26.92M | -15.61M | -9.01M | 13.12M | -84K | -138K | 5.3M | 6.68M | 1.89M | 1.21M | 1.21M | 49.88M | 693K | 2.67M | 489K | 8K |
| Dividends Paid | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| Share Repurchases | -750M | -500M | 0 | -99.98M | 0 | -175M | -146.93M | -128.96M | -133.11M | -110M | -457.89M | -140.03M | 0 | -15.61M | -9.01M | 0 | -84K | -138K | 0 | 0 | 0 | -197K | -197K | 0 | 0 | 0 | 0 | 0 |
| Other Financing | -1.22M | -13.09M | -16K | -34K | -30.33M | -60.02M | 21.52M | 20.56M | 13.83M | 16.29M | 26.51M | 23.63M | 1.88M | 14.03M | 5.16M | 2.18M | 4.91M | 12.58M | -1.17M | 911K | -96K | -5.11M | 48.44M | -47.38M | 7.34M | 6.68M | -11.21M | 3.39M |
| Net Change in Cash | 108.51M | 160.68M | 89.33M | -463.44M | -88.09M | 320M | 124.46M | 112.99M | 90.32M | 88.63M | -14.99M | -63.62M | 68.47M | -5.19M | -136.47M | 110.91M | 86.42M | -18.5M | 13.84M | 3.53M | 59.51M | 663K | 37.37M | -17.98M | 25.11M | -15.37M | 14.2M | -42M |
| Free Cash Flow | 861.99M | 1.12B | 1.02B | 421.15M | 735.39M | 543.67M | 361.9M | 215.62M | 48.71M | 216.6M | 229.8M | 137.17M | 191.74M | 82.98M | -15.09M | 56.48M | 221.28M | 13.4M | -32.42M | 18.94M | 1.65M | 9.61M | 30.55M | -31.18M | 6.84M | -8.26M | 892K | -7.9M |
| FCF Margin % | 10.45% | 13.51% | 12.57% | 5.44% | 13.42% | 19.44% | 12.9% | 8.31% | 2.77% | 13% | 14.59% | 9.12% | 14.35% | 7.44% | -1.6% | 6.27% | 24.93% | 1.55% | -5.14% | 4.16% | 0.48% | 2.94% | 10.29% | -13.81% | 4.37% | -7.11% | 1.1% | -14.16% |
| FCF Growth % | -22.94% | 9.63% | 142.27% | -42.73% | 35.26% | 50.23% | 67.84% | 342.63% | -77.51% | -5.74% | 67.53% | -28.46% | 131.07% | 649.79% | -126.72% | -74.48% | 1551.33% | 141.33% | -271.23% | 1045.55% | -82.81% | -68.53% | 197.98% | -555.52% | 182.87% | -1025.9% | 111.29% | - |
| FCF per Share | 10.92 | 13.47 | 12.34 | 5.11 | 10.80 | 10.20 | 6.66 | 3.94 | 0.89 | 3.84 | 3.81 | 2.17 | 3.08 | 1.37 | -0.25 | 0.93 | 3.69 | 0.22 | -1.09 | 0.66 | 0.06 | 0.70 | 2.23 | -2.56 | 0.56 | -0.69 | 0.04 | -0.66 |
| FCF Conversion (FCF/Net Income) | 4.52x | 1.63x | 1.90x | 1.11x | 5.41x | 1.81x | 1.10x | 0.82x | 1.36x | 0.99x | 1.17x | 0.99x | 2.15x | 2.05x | 0.88x | 1.00x | 2.70x | 1.04x | 0.77x | 1.32x | 1.08x | 1.86x | 1.70x | 1.18x | 1.22x | -0.14x | 1.38x | 0.19x |
| Interest Paid | 0 | 0 | 317.98M | 210.92M | 106.2M | 13.06M | 13.06M | 13.06M | 13.09M | 13.62M | 2.17M | 533K | 548K | 602K | 388K | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| Taxes Paid | 0 | 0 | 163.78M | 116.32M | 55.1M | 27.6M | 29.84M | 18.56M | 12.3M | 10.21M | 14.83M | 17.83M | 14.1M | 18.48M | 22.72M | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
Backlog conversion and margin erosion
As reported in quarterly filings, ICON's operating cash flow to net income ratio has fluctuated wildly, reaching an extreme 5.15x in 2025Q4, which suggests that reported net income is currently a poor proxy for the company's actual ability to generate cash from its core operations.
The significant variance between net income and operating cash flow indicates that non-cash charges and working capital swings are heavily distorting the bottom line. Investors should monitor whether this divergence is a temporary accounting artifact or a sign that the company's underlying earnings quality is deteriorating as it struggles to convert clinical milestones into realized cash.
Based on the provided financial data, ICON's free cash flow margin has shown significant instability, swinging from a high of 29.5% in 2025Q4 to a low of 6.3% in 2025Q2, reflecting the inherent difficulty in maintaining consistent cash generation amidst a cooling clinical trial demand environment.
The erratic nature of these margins suggests that ICON's cash-generative capacity is highly sensitive to the timing of project milestones and client payments. This volatility complicates long-term valuation, as the company appears unable to sustain a predictable cash flow trajectory despite its scale in the CRO industry.
According to recent SEC filings, ICON's working capital changes have been highly inconsistent, with a notable $169 million outflow in 2025Q2 followed by a $119 million inflow in 2025Q3, indicating that the company is facing significant friction in managing its cash conversion cycle effectively.
These sharp swings in working capital suggest that the company may be struggling with either delayed client collections or inefficient inventory management related to its site-based model. Such instability in the cash conversion cycle warrants further investigation into whether the company is being forced to extend payment terms to retain clients.
As evidenced by the $500 million share repurchase in 2025Q4, ICON has prioritized returning capital to shareholders even as revenue growth has stalled, a strategy that may be premature given the company's low net margin of 2.78% and the ongoing integration challenges from recent acquisitions.
The decision to deploy significant cash toward buybacks while operating margins remain under pressure suggests a management focus on supporting the share price rather than reinvesting in operational efficiency. Investors should consider whether this capital allocation strategy limits the company's flexibility to address potential future liquidity needs or competitive threats.
Quick answers to the most common questions about buying ICLR stock.
ICON Public Limited Company (ICLR) generated $1.04B in net cash from operating activities in 2025. This reflects the cash generated directly from core business operations.
ICON Public Limited Company (ICLR) generated $862.0M 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.
ICON Public Limited Company (ICLR) spent $174.2M 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, ICON Public Limited Company (ICLR) spent $750.0M on share repurchases. This shows the company's commitment to returning capital to its equity investors.