O'Reilly Automotive, Inc.

O'Reilly Automotive, Inc. is an American specialty retailer of automotive aftermarket parts, tools, supplies, equipment, and accessories, operating 6,644 stores across the United States, Mexico, and Canada as of the first quarter of fiscal 2026. The company generated $17.78 billion in revenue in fiscal 2025, making it one of the two largest pure-play aftermarket parts retailers in North America, alongside AutoZone.

This is a story about a business that has compounded revenue at a roughly 8% CAGR for two decades without a single year of negative comparable store sales since its 1993 IPO, and about whether that compounding can continue at a similar rate. The engine is deceptively simple: a fragmented industry with structural tailwinds, a dual-market strategy that serves both do-it-yourself consumers and professional service providers, and a capital allocation model that returns every dollar of excess cash to shareholders through buybacks. The question the file turns on is whether the market's current valuation — roughly 28 times trailing earnings — appropriately discounts the risk that the industry's post-pandemic pricing tailwinds are now normalizing, or whether the compounding is durable enough to justify the multiple.

O'Reilly occupies a rare position: a retailer with 10% market share in a $170-billion-plus addressable market that has grown comparable store sales for 33 consecutive years, generates mid-teens operating margins, and holds no net cash because management believes every dollar is better deployed in buybacks than on the balance sheet. The file below examines what the business is, what it would take for the compounding to break, and what the market is actually pricing.