Free cash flow remains highly volatile, evidenced by a shift from a 2025Q3 peak of $22.8M to a -8.5% FCF margin in 2025Q4.
| Cash from Operations | 82.73M | 81.06M | 73.42M | 81.12M | 87.21M | 88.68M | 24.33M | 35.13M | 15.6M |
| Operating CF Margin % | - | 28.65% | 25.21% | 30.38% | 34.02% | 39.08% | 16.36% | 30.85% | 15.71% |
| Operating CF Growth % | 105.27% | 10.4% | -9.49% | -6.98% | -1.66% | 264.49% | -30.73% | 125.23% | - |
| Net Income | -17.49M | -14.46M | 12.5M | 8.88M | 28.7M | 56.6M | 26.61M | 6.64M | 4.42M |
| Depreciation & Amortization | 42.08M | 43.77M | 45.35M | 44.77M | 34.25M | 23.07M | 15.74M | 12.67M | 12.29M |
| Stock-Based Compensation | 37.17M | 38.38M | 37.68M | 28.86M | 20.65M | 14.11M | 3.56M | 2M | 3.17M |
| Deferred Taxes | -11.16M | -14.49M | -10.98M | -13.41M | -7.17M | 4.75M | 2.93M | 193K | -4K |
| Other Non-Cash Items | 5.39M | 5.48M | 2.66M | 7.77M | 11.29M | -3.39M | 363K | 4.06M | 436K |
| Working Capital Changes | 26.73M | 22.38M | -13.78M | 4.24M | -514K | -6.46M | -24.89M | 9.56M | -4.72M |
| Change in Receivables | 12.22M | 66.57M | -49.34M | -75.72M | -24.41M | -67.41M | -102.17M | -11.92M | -24.18M |
| Change in Inventory | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 2.63M | 44.28M |
| Change in Payables | 19.18M | -42.4M | 38.1M | 79.69M | 29.76M | 68.3M | 77.36M | 18.46M | 17.56M |
| Cash from Investing | 6.55M | 6.07M | 22.31M | -39.02M | -81.37M | -96.72M | -29.88M | -22.09M | -12.75M |
| Capital Expenditures | -12.91M | -14.35M | -17.59M | -10.6M | -35.87M | -30.43M | -24.18M | -14.99M | -9.66M |
| CapEx % of Revenue | 4.59% | 5.07% | 6.04% | 3.97% | 13.99% | 13.41% | 16.25% | 13.17% | 9.73% |
| Acquisitions | 0 | 0 | 0 | 0 | -28.09M | 0 | 0 | -500K | 4.47M |
| Investments | - | - | - | - | - | - | - | - | - |
| Other Investing | -20.21M | -20.51M | -20.94M | -17.69M | -13.02M | -8.93M | -7.23M | 500K | -4.47M |
| Cash from Financing | -46.32M | -42.73M | -73.48M | -55.98M | 4.04M | 9.36M | 52.48M | -1K | -7.99M |
| Debt Issued (Net) | -141K | -140K | -131K | -126K | -119K | -10K | 0 | 0 | -3M |
| Equity Issued (Net) | -48.47M | -42.59M | -75.33M | -59.27M | 0 | -858K | 45.81M | -5K | -1.01M |
| Dividends Paid | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| Share Repurchases | -50M | -46.5M | -75.33M | -59.27M | 0 | -858K | -3K | -5K | -301K |
| Other Financing | 2.29M | 0 | 1.99M | 3.42M | 4.16M | 10.23M | 6.68M | 4K | -3.99M |
| Net Change in Cash | 43.06M | 45.07M | 21.94M | -13.87M | 9.88M | 1.32M | 46.94M | 13.04M | -5.15M |
| Free Cash Flow | 42.54M | 66.71M | 34.9M | 52.83M | 38.32M | 49.32M | -7.07M | 20.13M | 5.94M |
| FCF Margin % | 15.1% | 23.58% | 11.98% | 19.79% | 14.95% | 21.74% | -4.75% | 17.68% | 5.98% |
| FCF Growth % | 64.04% | 91.17% | -33.95% | 37.88% | -22.31% | 797.3% | -135.14% | 239% | - |
| FCF per Share | 0.90 | 1.42 | 0.64 | 0.94 | 0.67 | 0.87 | -0.15 | 0.42 | 0.12 |
| FCF Conversion (FCF/Net Income) | -2.43x | -5.60x | 5.87x | 9.13x | 3.04x | 1.57x | 0.91x | 5.29x | 3.52x |
| Interest Paid | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| Taxes Paid | 7.4M | 0 | 14.18M | 15.63M | 9.19M | 6.79M | 2.69M | 3.02M | 769K |
Fixed cost operating leverage
As reported in recent financial statements, PubMatic's operating cash flow frequently decouples from net income, evidenced by a 2025Q3 OCF/NI ratio of -5.02, suggesting that non-cash adjustments and working capital fluctuations are the primary drivers of reported cash generation rather than core operational profitability.
The persistent gap between net income and operating cash flow indicates that the company's reported earnings are heavily influenced by non-cash items, including significant stock-based compensation. Investors should monitor whether this divergence reflects sustainable working capital management or an over-reliance on accounting adjustments to bridge the gap between GAAP losses and cash reality.
Based on the provided quarterly data, free cash flow trajectory remains highly erratic, swinging from a 2025Q3 peak of $22.8M to a -8.5% FCF margin in 2025Q4, which highlights the company's sensitivity to seasonal ad spend cycles and the lack of consistent cash flow generation.
The inability to maintain a stable FCF margin suggests that the company's proprietary infrastructure requires lumpy, unpredictable capital outlays that disrupt cash flow consistency. This volatility may indicate that the business model is currently struggling to achieve the scale necessary to generate reliable free cash flow in a contracting revenue environment.
According to historical cash flow filings, working capital changes have frequently provided a positive tailwind to operating cash flow, such as the $20.4M contribution in 2025Q3, which appears to be a critical mechanism for offsetting the company's underlying operational cash burn during periods of revenue decline.
The reliance on working capital swings to bolster operating cash flow suggests that the company is effectively managing its payables and receivables to preserve liquidity. However, this is a finite lever, and investors should be wary of whether these inflows are sustainable or merely a temporary deferral of cash outflows.
As evidenced by the financial data, PubMatic has prioritized share repurchases, including a notable $38.6M outflow in 2025Q2, even while the company simultaneously reports net losses, suggesting a capital allocation strategy that may be prioritizing shareholder optics over the preservation of cash for infrastructure reinvestment.
The decision to return capital to shareholders during a period of negative operating margins warrants further investigation into management's long-term capital allocation priorities. This strategy appears to contrast with the company's need to maintain its proprietary infrastructure, potentially limiting the financial flexibility required to navigate future industry-wide ad-tech headwinds.
Quick answers to the most common questions about buying PUBM stock.
PubMatic, Inc. (PUBM) generated $81.1M in net cash from operating activities in 2025. This reflects the cash generated directly from core business operations.
PubMatic, Inc. (PUBM) generated $66.7M 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.
PubMatic, Inc. (PUBM) spent $14.3M 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, PubMatic, Inc. (PUBM) spent $46.5M on share repurchases. This shows the company's commitment to returning capital to its equity investors.