AAON, Aaon, Inc.

Will it survive?

• Can it pay its interest? 3323.8×
  Comfortable
  Operating income $146M ÷ interest expense $44K
  What this means

  Operating profit covers interest with the kind of margin Graham wanted for a defensive holding. Necessary, not sufficient, it says solvent, not cheap.

• How heavy is the debt, net of cash? $6M · 0.0× operating profit
  Modest net debt
  Cash $13K − debt $6M
  What this means

  Netting $13K of cash and short-term investments against $6M of debt leaves $6M owed, about 0.0× a year's operating profit. Net debt is the leverage figure that matters: the cash is already set against the debt. Strategic or illiquid investments aren't counted here.

• How long is cash tied up? 132d
  Long (60+ days)
  DSO 80 + DIO 90 − DPO 38 days
  What this means

  Days cash is tied up between paying suppliers and collecting from customers. Lower is better; a long cycle means growth itself eats cash.

Is it a good business?

• Return on invested capital 20%
  High through the cycle
  10-yr median, range 13%–29%; 14% latest = NOPAT $122M ÷ invested capital $901M
  Industry peers: median 10%
  What this means

  The rate the business earns on the money tied up in it, Buffett's north star, because over time a stock tracks the ROIC beneath it. Above ~15% sustained hints at a moat; a return below the cost of capital (~8%) erodes value as a business grows rather than building it — the test Buffett weighs most. The headline is the median of the last 10 years (it ran 14% most recently), so one peak or trough year doesn't set the verdict. Asset-light businesses (R&D expensed, little capital) read artificially high, pair this with Owner Earnings.

• Owner-earnings margin 10%
  Solid through the cycle
  10-yr median margin, range -5%–20%; latest ($79M) = operating cash $534K − maintenance capex $79M
  Industry peers: median 7%
  What this means

  What an owner could take out without starving the business: operating cash less the maintenance capital it must spend to hold its position — Buffett's owner earnings. That's -5% of revenue this year, a 10% median across 10 years. It chose to put $111M more into growth, so free cash flow this year was ($190M) — the gap is investment, not weakness. Treating stock comp as the real expense it is (less $18M of SBC) leaves ($97M).

• Are earnings backed by cash? 0.00×
  Thinly cash-backed
  Cash from ops $534K ÷ net income $108M
  What this means

  How much of reported profit showed up as operating cash. Above 1× is reassuring; well below suggests earnings lean on accruals. One year is noisy, growth and working-capital swings distort it, and this is operating cash, not free cash. Watch the multi-year trend.

How is the cash used?

• Where do the earnings go? —
  No surplus to allocate
  What this means

  The business didn't generate positive Owner Earnings this year, so any distributions came from the balance sheet or borrowing, not from operations.

• Investing or harvesting? 2.41×
  Expanding
  Capex $191M ÷ depreciation $79M
  What this means

  Descriptive, not a grade. Above ~1× means investing faster than assets wear out (growth, or, sustained for years, today's earnings carrying less depreciation than tomorrow's will). Below means spending less than it's wearing out (efficiency, or a melting asset base). The ratio won't tell you which; the filings will.

Graham’s defensive tests · 5 of 6 met

Graham’s numerical criteria for the defensive investor (The Intelligent Investor, ch. 14), run on the filings. A floor of safety, not a buy signal; many fine modern businesses fail his strictest liquidity rules by design.

• Adequate size Near
  Revenue ≥ $2B · $1.4B
  What this means

  Big enough to weather a storm. Graham's 1972 floor was ~$100M of sales (≈ $700M today); we use a $2B revenue line as a conservative modern stand-in.

• Strong liquidity Pass
  Current ratio ≥ 2× · 2.63×
  What this means

  Current assets at least twice current liabilities, near-term bills covered without touching the business. Strict by design: many cash-rich modern firms run leaner and miss it, holding their cushion in longer-dated securities.

• Conservative debt Pass
  Debt ≤ working capital · $6M vs $538M WC
  What this means

  Graham's rule that borrowings not exceed net current assets. Capital-heavy and buyback-heavy firms routinely fail it, read it next to interest coverage, not alone.

• Earnings stability Pass
  A profit every year (10-yr record) · no losses
  What this means

  Graham wanted earnings in each of the past ten years, the stability a defensive owner leans on.

• Dividend record Pass
  Uninterrupted dividends · paid every year (10)
  What this means

  An unbroken dividend was Graham's mark of durability. He wanted twenty years; the filings show about ten, and a single suspension breaks the streak. Non-payers, many fine modern compounders, fall outside his defensive net by design.

• Earnings growth Pass
  Earnings +33% over the record · +203%
  What this means

  At least a third more earnings than a decade ago, averaging three years at each end. Net income (not per-share), so stock splits don't distort it, buybacks and dilution show up in the share-count line instead.

• Moderate price —
  P/E ≤ 15 and P/E × P/B ≤ 22.5 · decided by the price
  What this means

  Graham's valuation gate, the wall he kept between a sound business and a sound investment. Three-year average earnings are $1.85/share (latest year $1.31), the averaged base the calculator's gate runs on, and book value is $10.93/share. Enter a price in “What the price implies” just below for the P/E, P/B, and whether it clears. But this is the rule Buffett outgrew: there's no hard P/E law, and a wonderful business can deserve a far richer multiple if the thesis holds, treat it as the bargain-hunter's floor, not a verdict on the price.

Durability & moat, 2016–2025

Whether the record’s returns held, and what the capital reinvested earned.

• Profitable years 10 of 10
  What this means

  Never lost money over the record, the earnings stability Graham insisted on.

• Return on capital ≥ 15% 5 of 6 yrs
  What this means

  A moat shows up as a high return on invested capital that holds year after year, not one good vintage.

• Operating margin 17% → 16% (3-yr avg ends)

  In the filing’s words The filing attributes gains to higher prices, but the margin in the record has not followed — the claim outruns the result here.

  What this means

  Through the cycle the operating margin held roughly steady — about 17% early, 16% lately, median 14%.

• Reinvestment, incremental ROIC 19%
  What this means

  Every extra dollar the business reinvested came back at a high incremental return — the lens GBM read for a moat that reinvests rather than merely harvests. The record and the 10-K are where you check whether the rate holds.

• Owner earnings growth −7%/yr
  What this means

  Owner earnings shrank about 7% a year over the record.

• Worst year 2025 · 10.1% op. margin
  What this means

  Stayed profitable even in its hardest year, the resilience that survives recessions.

• Share count +5.0%/yr
  What this means

  The share count is rising, dilution works against you on a per-share basis.

• Dividend record rising
  What this means

  Paid and raised the dividend across the record, the continuity Graham prized.

• How management talks about it Promotional
  What this means

  The returns have faded, yet the filing reaches for a promoter’s vocabulary — world-class, best-in-class, disruptive — more than an owner’s. When the words sell harder than the results deliver, the gap is the thing to weigh.