BillionToOne, Inc. (BLLN) Cash Flow Statement

The gap between net income and operating cash flow narrowed significantly in recent quarters, with 2025Q3 OCF/NI at 6.63 and 2025Q4 at 1.81, suggesting that accruals are becoming less distortive. However, the 2026Q1 ratio below 1 implies that working capital outflows or other non-cash adjustments temporarily suppressed cash generation relative to earnings. Investors should monitor whether this conversion volatility persists as revenue growth normalizes.

The trajectory shows a clear inflection: FCF turned positive in 2025Q1 and has remained positive for five consecutive quarters, with the 2026Q1 FCF margin reaching 10.1%. This improvement is driven by operating cash flow growth outpacing modest capex, which suggests that the business is beginning to convert its revenue expansion into cash. However, the 2026Q2 FCF margin dipped to 4.6% from 10.1% sequentially, indicating that the pace of cash generation may be uneven as investment intensity fluctuates.

Capital expenditures have stayed between $1.6M and $4.5M per quarter, well below the pace of revenue growth, which implies that BLLN's diagnostics platform does not require heavy fixed-asset investment to expand. This low capital intensity is a positive signal for future FCF generation, as the company can potentially scale without proportionate capex increases. However, the modest absolute capex may also suggest that the company is underinvesting in capacity or technology, which could constrain growth if demand continues to accelerate.

The persistent negative working capital changes, particularly the -$14.5M in 2026Q1 and -$11.9M in 2026Q2, suggest that receivables or inventory are growing faster than payables, likely due to rapid revenue expansion. This pattern is common in high-growth companies but warrants monitoring, as it can pressure cash flow if not managed. The fact that operating cash flow still turned positive despite these headwinds indicates that underlying profitability is strong enough to absorb the working capital drag.

With zero capital returns, the company is clearly prioritizing reinvestment in its operations, which aligns with its triple-digit revenue growth and heavy SG&A spending. This conservative deployment strategy is typical for a company at this stage, but it also means that shareholders are relying entirely on future earnings growth for returns. Given the low ROE of 2.3%, investors should monitor whether this reinvestment eventually translates into higher returns on equity.

The cumulative OCF exceeding net income by $21.5M suggests that non-cash charges like D&A and SBC are inflating the gap, but also that working capital is not permanently consuming cash. This divergence is a positive sign, as it indicates that earnings are backed by actual cash flows. However, the pattern is uneven, with 2024Q4 showing a negative OCF, so the cumulative surplus is heavily influenced by recent quarters. Investors should watch whether this trend continues as growth matures.