Is the CEO Lying? How to Read a Cash Flow Statement

What It Covers

Stephen Morris and Andrew Sather break down how to read a cash flow statement by analyzing working capital components — accounts receivable, inventory, and cash conversion cycle — using real companies like Boeing, Target, Costco, and Microchip Technology to identify red flags that signal accounting manipulation or business deterioration.

Key Questions Answered

• •Accounts Receivable Red Flag — Channel Stuffing: When accounts receivable growth significantly outpaces revenue growth, it signals potential channel stuffing or collection problems. A concrete warning sign: one solar company Andrew evaluated had 30–40% of its receivables concentrated in a single customer, Sunrun. That level of customer concentration creates catastrophic risk if that customer defaults or goes bankrupt, potentially halving the company's effective value overnight.
• •Days Inventory Outstanding (DSI) as a Leading Indicator: Track DSI trends over time rather than in isolation. Boeing's DSI rose steadily from 2016 to 2021, preceding its stock crash in 2019. Microchip Technology's DSI rose nearly exponentially before its stock tumbled. Compare current DSI against a company's own long-term historical average — sustained elevation above that average signals inventory piling up before it appears in earnings.
• •Negative Working Capital as a Competitive Moat: Companies like Costco and Amazon collect cash from customers before paying suppliers, effectively receiving interest-free financing that funds growth. This structural advantage eliminates the capital constraints that burden inventory-heavy startups — as Phil Knight documented in *Shoe Dog* — and allows aggressive expansion without costly external borrowing or equity dilution.
• •Cash Conversion Cycle Requires Industry Context: A lower cash conversion cycle generally signals efficiency, but direct competitor comparisons can mislead. Coke currently carries a negative cash conversion cycle, roughly twice as efficient as Pepsi's. Meanwhile, GM and Ford show sharply rising cash conversion cycles alongside their EV struggles. Always benchmark against a company's own historical average and its specific product mix before drawing conclusions.
• •Inventory Type Determines Risk Level: Not all inventory carries equal risk. Perishable or rapidly obsolete inventory — consumer electronics at Best Buy, EVs at Tesla — depreciates or becomes worthless quickly. Discretionary goods like Circuit City's electronics collapsed during economic downturns. Contrast this with Ferrari inventory, which holds value longer. Assess what the inventory actually is before treating rising inventory levels as automatically negative.