The Solitary Observer analyzed 67 OPC bankruptcies in 2025-2026. Median annual revenue at time of bankruptcy: $890,000. Median profit margin: 34%. These were not failing businesses. They were profitable businesses that ran out of cash. The culprit: cash conversion cycle mismatch. Money coming in thirty to ninety days after money going out. The gap killed them. Consider Marcus L., a B2B SaaS operator in Austin generating $127K/month in recurring revenue. His churn was under 2%. His net revenue retention was 118%. By every metric, his business was thriving. But Marcus offered enterprise customers net-60 payment terms to close larger deals. His own infrastructure costs—AWS, customer support contractors, development tools—were due net-30 or immediate. When three enterprise customers ($89K combined) paid at day 67 instead of day 60 due to 'accounting processing delays,' Marcus could not make his AWS payment. Service suspended. Customer-facing applications went offline. Twelve customers cancelled within forty-eight hours. Marcus's business never recovered. He filed Chapter 7 bankruptcy in February 2026. Profitable. Positive unit economics. Dead from cash flow gap. Reflection: We were taught to optimize for growth, for margin, for valuation. But cash flow is the oxygen of business. You can survive without profit for years. You cannot survive without cash for weeks. The operator who focuses exclusively on P&L while ignoring cash flow is like a driver watching the speedometer while the fuel gauge hits empty. Strategic Insight: Implement Cash Flow Defense in four layers. Layer One: Compression. Reduce your cash conversion cycle aggressively. Offer discounts for upfront payment (5% for annual, 2% for quarterly). Require deposits for custom work (50% upfront). Layer Two: Reserves. Maintain a minimum cash reserve equal to 90 days of operating expenses. Not invested. In operating accounts, accessible immediately. Layer Three: Diversification. Never allow any single customer to represent more than 15% of monthly revenue. Layer Four: Forecasting. Build a thirteen-week cash flow forecast, updated weekly. Not revenue forecast—cash forecast. Model worst-case scenarios.