--- title: "Auto Aftermarket 13Fs: AutoZone, O'Reilly, Advance Auto Parts" type: learn slug: auto-aftermarket-13f-azo-orly-decoder canonical_url: https://13finsight.com/learn/auto-aftermarket-13f-azo-orly-decoder published_at: 2026-05-16T14:28:52.657Z updated_at: 2026-05-16T14:28:57.037Z author: Sarah Mitchell author_title: Education Editor author_url: https://13finsight.com/authors/sarah-mitchell word_count: 533 locale: en source: 13F Insight --- # Auto Aftermarket 13Fs: AutoZone, O'Reilly, Advance Auto Parts > AutoZone, O'Reilly Automotive, Advance Auto Parts, plus Genuine Parts and LKQ Corporation anchor US auto aftermarket 13F positioning. Vehicle age dynamics, DIY-vs-DIFM mix, commercial program growth, plus emerging EV transition drive distinctive institutional patterns. US auto aftermarket parts equities form a distinctive specialty retail corner of institutional 13F positioning. AutoZone (AZO), O'Reilly Automotive (ORLY), Advance Auto Parts (AAP), Genuine Parts Company (GPC, NAPA), plus LKQ Corporation (LKQ) anchor the cohort. Multi-year emerging vehicle age dynamics (US fleet average age 12.6 years 2024 record), DIY-vs-DIFM mix evolution, commercial program growth, plus emerging EV transition drive distinctive institutional positioning. Reading auto aftermarket 13F positioning requires understanding the vehicle parc framework plus the multi-year cycle dynamics.The auto aftermarket business modelAuto aftermarket retailers operate four primary economic engines:Vehicle age dynamics. US passenger vehicle fleet average age reached record 12.6 years in 2024 driving multi-year aftermarket parts demand. Multi-year emerging post-pandemic vehicle scarcity plus emerging consumer affordability pressure plus emerging high interest rates extending vehicle ownership drives fleet aging. Multi-year emerging older vehicles drive higher parts demand per vehicle.DIY vs DIFM mix. Auto aftermarket splits between DIY (do-it-yourself) customers (AutoZone, O'Reilly retail emphasis) plus DIFM (do-it-for-me) commercial customers (O'Reilly commercial program plus emerging Advance Auto Parts commercial). Multi-year emerging shift toward DIFM driven by vehicle complexity plus emerging consumer time pressure.Commercial program growth. Multi-year emerging commercial program growth selling parts to independent repair shops, fleet operators, plus emerging dealerships drives operator economics. O'Reilly's First Call commercial program plus emerging AutoZone Commercial drives mid-teens commercial revenue growth.EV transition emerging. Multi-year emerging electric vehicle adoption (8% of new vehicle sales 2024) plus emerging hybrid penetration drives multi-decade aftermarket evolution. Multi-year emerging EV-specific parts (battery, electric drivetrain, regenerative braking) plus emerging traditional ICE parts persistence (existing fleet) drive operator positioning.Major US auto aftermarket namesAutoZone (AZO)Largest US auto aftermarket retailer plus DIY emphasis plus emerging commercial program expansion plus emerging Mexico plus Brazil international footprint. Multi-decade compounding plus emerging buyback discipline plus emerging recent international scaling.O'Reilly Automotive (ORLY)Second-largest US auto aftermarket retailer plus dual-market (DIY plus DIFM) model plus emerging First Call commercial program plus emerging Mexico expansion. Multi-decade compounding plus emerging operational discipline.Advance Auto Parts (AAP)Diversified auto aftermarket plus emerging Worldpac wholesale plus emerging operational restructuring (Worldpac divestiture announced 2024). Multi-year emerging operational pressure plus emerging turnaround positioning.Genuine Parts Company (GPC)NAPA auto parts plus Motion Industries (industrial parts). Multi-year emerging operational scaling plus emerging dividend aristocrat (69-year dividend growth) plus emerging Europe plus Australia international.LKQ Corporation (LKQ)Aftermarket plus recycled collision parts plus emerging Europe Aftermarket plus emerging specialty distribution. Multi-year emerging operational scaling plus emerging international integration.How institutional managers position around auto aftermarketThree patterns appear across smart-money 13Fs:Pattern 1: Quality-compounder concentrationAZO, ORLY-concentrated growth manager positions reflect multi-decade compounding plus emerging operational discipline thesis.Pattern 2: Turnaround positioningAAP-concentrated value-discipline manager positions reflect operational restructuring plus emerging margin recovery thesis.Pattern 3: Dividend-quality positioningGPC-concentrated income-focused manager positions reflect dividend aristocrat plus emerging diversified parts thesis.How to read auto aftermarket 13F positioningThree rules apply:Rule 1: Identify business mixDIY-emphasis vs DIFM-emphasis vs collision parts have distinct economics.Rule 2: Watch comparable store salesMulti-year comp drives operator economics.Rule 3: Cross-check vehicle parc dataMulti-year vehicle age plus emerging vehicle scrappage drive parts demand.What auto aftermarket positioning signalsQuality-compounder conviction. Concentrated AZO, ORLY positions signal quality compounding thesis.Turnaround conviction. Concentrated AAP positions signal operational turnaround thesis.Dividend-quality conviction. Concentrated GPC positions signal dividend aristocrat thesis.For real-time tracking of auto aftermarket 13F activity, see the institutional signals feed. ## FAQ ### What are the major US auto aftermarket retailers? Five major US auto aftermarket: (1) AutoZone (AZO) — largest, DIY emphasis; (2) O'Reilly Automotive (ORLY) — dual DIY-DIFM; (3) Advance Auto Parts (AAP) — diversified plus Worldpac wholesale; (4) Genuine Parts Company (GPC) — NAPA plus Motion Industries; (5) LKQ Corporation (LKQ) — aftermarket plus recycled collision parts. Plus Monro (MNRO) in service segment. ### Why is the US vehicle fleet aging? US passenger vehicle fleet average age reached record 12.6 years in 2024. Multi-year drivers: (1) post-pandemic vehicle scarcity (chip shortage 2021-2023 reduced new vehicle production); (2) consumer affordability pressure (average new vehicle price $48K vs $36K pre-pandemic); (3) high interest rates extending ownership; (4) vehicle quality improvements (250K+ mile durability common). ### What is the DIY vs DIFM mix? Auto aftermarket splits between DIY (do-it-yourself, retail customer) plus DIFM (do-it-for-me, independent repair shops, fleets, dealerships). Multi-year shift toward DIFM driven by vehicle complexity plus emerging consumer time pressure. DIFM grew from 60% of US aftermarket spend to 65%+ through 2020s. Multi-year commercial program growth at O'Reilly, AutoZone drives DIFM positioning. ### How does commercial program growth work? Commercial programs sell auto parts to independent repair shops, fleet operators, plus emerging dealerships through dedicated sales reps plus delivery vehicles. O'Reilly's First Call commercial program drives mid-teens commercial revenue growth. AutoZone Commercial scaling from 30% to 40%+ revenue mix. Multi-year emerging same-day delivery economics drive market share dynamics. ### How does EV transition affect auto aftermarket? Multi-year EV adoption (8% of new vehicle sales 2024) plus emerging hybrid penetration drives multi-decade aftermarket evolution. EVs have fewer moving parts (no oil changes, fewer brake replacements due to regenerative braking) but emerging battery service plus emerging tire wear (heavier vehicles) plus electric drivetrain parts. Multi-year traditional ICE parts persistence (250M+ existing fleet) drives multi-decade transition. ### What signals auto aftermarket cycle inflections? Four signals: (1) comparable store sales plus emerging traffic dynamics; (2) vehicle age plus emerging vehicle scrappage data; (3) commercial program growth plus emerging market share; (4) M&A activity (Advance Worldpac divestiture, LKQ acquisitions). Concentrated 13F changes around these signals reveal manager cycle reading. --- Source: 13F Insight — https://13finsight.com/learn/auto-aftermarket-13f-azo-orly-decoder Author: Sarah Mitchell — https://13finsight.com/authors/sarah-mitchell Last updated: 2026-05-16T14:28:57.037Z