AutoZone, Inc. AZO

The business

AutoZone sells the replacement parts a car needs when something wears out: batteries, brake pads, alternators, starters, spark plugs, the unglamorous hard parts and the fluids that go with them. Two customers buy them. The weekend do-it-yourselfer walks into one of more than 6,000 US stores, and the professional repair shop orders through the commercial desk and takes delivery. AutoZone earns its money on retail markup, holding gross margins near 52%, unusually high for retail, because a person whose car will not start pays for the part that is in stock now, not the one that arrives Thursday. That is the moat: breadth of parts stocked close to the customer, backed by a hub-and-spoke network where a megahub carries the obscure alternator and feeds the stores around it same-day. The customer at the counter needs the specific part for a 2009 Silverado today, and AutoZone is built to have it.

The numbers

The sequence shows a business growing revenue steadily while the profit engine sputtered for a year and then found footing. Read the quarters first.

Q3, the spring repair season, is seasonally the strong quarter, so the 38% jump from Q2 is calendar, not signal. The year-over-year line is what matters: revenue up 8.4%, the fastest in more than a year, and diluted earnings per share up 7.7%. Net income rose only 5.4%. Earnings per share grew faster because the share count keeps shrinking. Gross margin came in at 52.2% against 52.7% a year earlier. A watch-item from the spring was that growth was sliding toward 5% and the profit recovery was hollow. The revenue half of that worry broke, sales reaccelerated rather than slowed, but the margin half held, the profit per dollar of sales is still leaking.

The full-year table carries the real tell. Fiscal 2025 revenue rose 2.4%, yet net income fell 6.2% and earnings per share fell 3.1%. Operating margin dropped from 20.5% to 19.1% as interest cost and store-network spending outran sales. The whole earnings story is the share count: diluted shares fell 16.8% in three years, which is why earnings per share compounded 7.3% a year while revenue grew 5.2%. But two gears are grinding. Free cash flow fell from $2.9B in fiscal 2021 to $1.8B in fiscal 2025, down 38%, because capital spending doubled to $1.3B building those megahubs. And the buyback that drives everything was cut in half last year, to $1.6B from $3.1B. The company's own read, a steady compounder, meets the memo's: the compounding rate is quietly downshifting, and the print that settles it is next year's buyback dollars against a recovering or still-falling free cash flow.

Management

Read the record, not the résumé. AutoZone spent about $16B buying back stock over five years, and timed it reasonably: $4.4B at an average $2,153 in fiscal 2022, only $1.6B at $3,736 in fiscal 2025, more when the stock was cheap, less when it was dear. The fiscal 2025 slowdown, though, looks less like discipline than a free-cash-flow constraint. Insiders have been net sellers, about $48M sold against $2M bought over the past year, a rounding error against a $49B company, with the largest sales clustered in January windows that read like scheduled programs, though the filing detail is not pulled this run. Chief executive pay runs $9.6M, under half a percent of profit, and is mostly options, so it rewards the share price above all.

How it fails or surprises you

Margin keeps slipping. Gross margin fell to 52.2% from 52.7%, and operating margin has already gone from 20.5% to 19.1% across the fiscal year. The commercial business carries a lower margin than the retail counter, so if its mix keeps rising and megahub costs stay heavy, fiscal 2026 becomes another revenue-up, profit-flat year. The print: operating margin below 19% next quarter.

Free cash flow does not recover. Cash flow fell 38% in four years while net income barely moved, and if capital spending does not roll off after the build-out, the buyback shrinks further and the 7% earnings growth halves. This is the fact in the memo's own numbers the compounder read explains least well, and the one that would prove it wrong. The print: fiscal 2026 free cash flow again below $2B.

Commercial and megahubs inflect (right tail). AutoZone has long trailed its main rival in the professional business. If the reaccelerated commercial growth holds and the megahubs convert to same-day availability at scale, revenue stays near 8% and margins recover as the hubs fill, re-rating a model the market prices for 5%. The market is not paying for this today. The print: two more quarters of commercial growth running ahead of the retail counter.

Closing thoughts

The shape of the payoff turns on one question a coming print answers: was fiscal 2025's margin dip and cash-flow slide the bottom of the megahub build, or the start of a structural downshift. If capital spending rolls off and margins steady, the compounder resumes, and 20 times earnings is fair-to-cheap on a stock already down a third from its high. If spending stays high and margins keep leaking, you own a slower compounder at a full multiple that deserves less. The left tail is shallow: the negative book value is an artifact of years of buybacks, not distress, and the business does not break, so the real risk is dead money, not permanent loss. On balance the fatter tail points up, because the price already carries a third of the bad news and the model is intact.

The bet is still that Americans keep their aging cars running and keep coming to AutoZone for the part, and that the company keeps shrinking its share count. What breaks it is the pair read together: free cash flow below $2B and operating margin below 19% at the same time would say the buyback engine and the margins are failing together, the fiscal 2025 pattern extended rather than ended. If instead free cash flow climbs back above $2.3B and operating margin holds 19% or better next fiscal year, the downshift was just the capex trough, and this memo's caution was wrong.