Retail / Membership Warehouse · Deep dive

Costco Wholesale Corporation

The $270B membership warehouse machine that runs on ~13% gross margin, ~4,000 SKUs, and a Kirkland private label that alone did ~$90B in 2025 — with a 92.2% US/Canada renewal rate and the first membership-fee hike in seven years now printing an incremental $1.33B of near-100%-margin fee income per quarter.

well positioned

A capped-markup, ~4,000-SKU warehouse format funded by a 92.2%-renewal membership fee is a structural cost and loyalty moat no rival has replicated in 40 years, and the first fee hike since 2017 just added a $1.33B/quarter near-100%-margin annuity on top of a business that is already gaining grocery share.

My take ★★ Very interesting ★ Interesting − Maybe ✗ Not interesting

Snapshot

Costco Wholesale is the world’s third-largest retailer by revenue ($269.9B in FY2025, +8.1%) and its most efficient membership business — a $1.33B/quarter fee annuity flowing into what is otherwise a ~13% gross-margin, ~4,000-SKU pallet-retail operation. Since Ron Vachris took the CEO chair from Craig Jelinek on January 1, 2024, the company has raised the membership fee for the first time in seven years (September 1, 2024), pushed the paid-member count to 82.9M households at a 92.2% US/Canada renewal rate (Q3 FY2026), and grown Kirkland Signature to roughly $90B in 2025 sales — about a third of the company. It matters right now because that single fee hike is now compounding through the P&L: Q1 FY2026 membership fee income jumped 14% year-over-year to $1.329B (StockTitan, December 2025), well above the 8-10% analyst consensus. That $1.33B is almost pure margin against a full company that generated $8.1B of net income in all of FY2025.

Founding story

Costco’s DNA is Sol Price’s, executed by his student. Sol Price — a San Diego attorney — founded FedMart in 1954 and then Price Club in 1976 in a converted airplane hangar on Morena Boulevard, San Diego, inventing the warehouse-club category (limited SKUs, cash-and-carry, business-and-employee membership, prices so low the format only worked with recurring dues). His EVP of merchandising was James D. Sinegal, a 19-year-old bagger who had followed Price from FedMart. In September 1983, Sinegal and Seattle attorney Jeffrey H. Brotman opened the first Costco warehouse in Seattle on the same principles, funded by Brotman’s Seattle capital network. Ten years later, on October 21, 1993, the two companies merged all-stock as PriceCostco (206 warehouses, ~$16B in sales); Sol Price and his son Robert kept a spin-off real-estate vehicle called Price Enterprises that was separated in 1997 (Britannica, Wikipedia). The renamed Costco Wholesale Corporation adopted its present name in 1999. Sinegal stayed CEO until January 1, 2012, then handed the company to Craig Jelinek — a Costco warehouse manager since 1984 — with an 18-month overlap. Jelinek in turn handed it to Ron Vachris, a Price Club forklift driver from 1982, on January 1, 2024. Every CEO in Costco’s 43-year history has been a Price-lineage lifer. Brotman remained Chairman until his death in August 2017.

How it works

A Costco warehouse is a ~150,000 sq ft concrete box on a parking lot pad with 20-foot pallet racking, no signage, no music, no bagging staff, and no more than about 4,000 SKUs on the floor — compared to ~140,000 in a Walmart Supercenter (Retail Dive, FourWeekMBA). Product moves in single vendor packs; a Cheerios “box” is a two-pack of family boxes on a shrink-wrap slip. Merchants — the Costco role Sinegal built the culture around — negotiate a landed cost with the supplier, cap markup at 14% (15% on Kirkland), and pass everything else to the member. Everything above the flat cost is fixed by policy; that policy is what forces suppliers to build products for Costco’s specific pack sizes, and it is why a Costco member can buy Calvin Klein jeans at $29.99 when the same jeans list at $50 elsewhere (Hustle, thanks to a Sinegal story he retold for two decades). The gross margin that survives — ~13% consistently — is not enough to run a normal retailer profitably. What closes the loop is the membership fee: $65 Gold Star or $130 Executive, paid in a lump at the door, sitting in a deferred-revenue line, and released into fee income over the following twelve months. Roughly ~75% of pretax operating income has historically come from those fees, which explains why every basis point of renewal rate is worth more than dozens of basis points of gross margin. On the wage side, Costco pays a $20/hr starting wage and $31.90/hr top of scale (2026, senior service clerks), well above Walmart and Target, on the theory that turnover kills warehouse throughput. Ancillary business — gas stations at 634 of the 924 warehouses (Q2 FY2026), pharmacy, optical, tire, hearing aid, food court — turns the warehouse into a traffic engine that pays back the parking-lot land cost.

Product and business overview

Costco’s segments are geographic (US, Canada, Other International) but the meaningful cut is by revenue type. Net sales — pallet retail — was $265.5B of FY2025’s $275.2B total revenue (~96%). Within that, food and sundries is the largest merchandise category (~40% of net sales), non-foods (electronics, small appliances, apparel, home) ~30%, fresh foods ~15%, and ancillary/other (gas, pharmacy, optical, food court, tires, travel) ~15%. Kirkland Signature — the in-house brand launched 1995 — sits across every category and represented roughly a third of company sales in 2025, or ~$90B (CNBC, March 2025; Costco’s 2026 Annual Meeting commentary). If Kirkland were a standalone company it would be roughly the size of Target and larger than Coca-Cola. Membership fee income was $4.83B in FY2025 and is on track for ~$5.5B in FY2026 following the September 2024 hike. E-commerce — historically an afterthought under Sinegal — grew +15.6% in FY2025 and +20.5% in Q1 FY2026, powered by same-day delivery via Instacart (partnership since 2017), Costco Logistics for big-and-bulky (built off the 2020 $1B Innovel acquisition), and a modernised app rolled out under Vachris.

Business model and pricing

Revenue books in three streams: merchandise sales (booked at point of sale, ~13% gross margin), membership fees (deferred and recognised over 12 months; near-100% incremental margin), and ancillary/services (gas, travel, insurance, credit card interchange sharing, mostly commission-like). Real prices, published:

• Gold Star membership: $65/yr (was $60 before Sept 1, 2024; before that $55 from 2017).
• Executive membership: $130/yr (was $120 before Sept 1, 2024). Comes with a 2% annual reward on eligible Costco purchases, capped at $1,250/yr (up from $1,000 pre-hike).
• National-brand markup ceiling: 14%.
• Kirkland Signature markup ceiling: 15%.
• Average basket markup: ~11% (Costco 2018 annual report, still cited).
• Kirkland pricing rule of thumb: 20% cheaper than the branded equivalent at Costco (Grocery Dive, Store Brands).
• Gasoline: typically 20-40 cents/gallon below the local branded-station average; Costco Kirkland gasoline TOP TIER certified.
• Rotisserie chicken: $4.99 unchanged since 2009 — the loss-leader Sinegal turned into a totem.
• Hot dog + soda combo: $1.50 unchanged since 1985.

Vendor economics: suppliers accept smaller per-SKU margin to get pallet velocity; a single Costco listing can be 10-30% of a mid-sized CPG’s US volume, which is why Kirkland can dictate co-manufacturing terms (Kirkland vodka is widely reported to be Grey Goose, Kirkland batteries widely reported to be Duracell, etc.).

Traction over time

Sources: Costco 10-K FY2015-FY2025, Q1 FY2026 press release (StockTitan, December 11, 2025), Q3 FY2026 10-Q, Statista warehouse count, ScrapeHero US warehouse count August 19, 2026.

Note: e-commerce comparable sales were +15.6% in FY2025 and +20.5% in Q1 FY2026. Membership fee income was $4.83B in FY2025 versus $4.58B in FY2024; Q1 FY2026 fee income alone was $1.329B, +14% YoY (StockTitan).

Market analysis

The US warehouse-clubs-and-supercenters industry is forecast to generate ~$770.4B in 2026, a ~1.6% gain over ~$758B in 2025 (IBISWorld / Statista). Within the warehouse-club sub-segment specifically, Costco holds ~62% share, Sam’s Club ~31%, BJ’s ~7% (mmcginvest, 2026). Household penetration of warehouse-club memberships is estimated at ~46% of US households in 2025 — with meaningful greenfield left in Sunbelt secondary metros where Costco still under-indexes, and abroad where CFO Millerchip has said Costco expects to be at least “fifty-fifty outside the US and Canada” over the next six-to-seven years (CNBC, January 2024). Structural tailwinds: US grocery share is migrating from mid-market supermarkets to club (Grocery Dive / Supermarket News, 2025); premiumisation of private label (Kirkland is the case study for the entire category); real-wage compression at the middle of the income distribution keeps the value proposition sharp. The swing factor is fee income compounding — a hike every ~5-7 years is now the operating cadence, and each one is worth several billion of near-100%-margin annuity. Structural headwinds: e-commerce trip-substitution (Amazon Prime, Walmart+), refrigerated small-basket delivery (Aldi expansion, Instacart, Uber grocery), and the multiple risk of a ~50x P/E on a business whose top-line growth is likely to slow toward high-single digits over the next five years (Seeking Alpha bear case, 2026).

Competitive intel

Sam’s Club (Walmart) is the only structural peer at scale — ~$90.2B FY2025 net sales, ~600 US clubs, a cheaper $50 base membership, and the industry’s most aggressive Scan & Go / phone-only checkout push (CNBC, October 2024). Sam’s has been chipping at Costco in fuel and Sunbelt suburbs, but has not touched Costco’s productivity per warehouse or its brand halo. BJ’s Wholesale is the East Coast third — 14 new club openings in FY2025 and a 25-30 opening pledge for 2025-2026 (thestreet.com), with a lower-income basket profile. Walmart proper competes on the everyday-value axis; Walmart+ at $98/yr bundles delivery, fuel and Paramount+ to try to blunt the Executive membership. Amazon Prime (~200M+ global members at $139/yr) is the digital substitution threat Cowen flagged as far back as 2016 (Retail Dive) — the segment of Prime-only households not holding a warehouse-club membership has kept expanding. Aldi (~2,500 US stores end-2025) and Trader Joe’s (~600 stores, est. ~$16B+ sales) run the limited-SKU private-label playbook with no membership dues and small-basket convenience; over a long enough horizon they compete for the same “trust me, this is good” grocery share. Kroger and Target are adjacencies rather than competitors — Kroger for private label (Simple Truth, Private Selection), Target for premium household discretionary and Circle 360. Failed challenger: Boxed — the “digital Costco for millennials” that reached ~$100M+ revenue by 2018, went public via SPAC in December 2021 at a ~$900M valuation, and filed for Chapter 11 in April 2023.

History and evolution

• 1976 — Sol Price opens the first Price Club in San Diego.
• September 15, 1983 — Jim Sinegal and Jeffrey Brotman open the first Costco warehouse in Seattle.
• 1985-12 — Costco Wholesale IPOs on NASDAQ.
• 1993-10 — All-stock merger of Costco and The Price Company creates PriceCostco (206 warehouses, ~$16B revenue).
• 1995 — Kirkland Signature private-label brand launched.
• 1997 — Price Enterprises spun off; renamed Costco Companies, Inc.
• 1999 — Present corporate name Costco Wholesale Corporation adopted.
• 2005 — First warehouse in Japan opens.
• 2012-01-01 — Sinegal steps down; Craig Jelinek (28-year Costco veteran) becomes CEO.
• 2017-06 — Membership fee raised: Gold Star $55->$60, Executive $110->$120.
• August 2017 — Co-founder and Chairman Jeffrey Brotman dies at 74.
• August 2019 — First China warehouse opens in Shanghai to a viral, closed-early opening day.
• November 2020 — Costco acquires Innovel Solutions from Transformco for ~$1B; rebrands as Costco Logistics (big-and-bulky final-mile).
• March 2024 — Long-serving CFO Richard Galanti (CFO since 1985) retires; Gary Millerchip (ex-Kroger) succeeds him.
• January 1, 2024 — Craig Jelinek retires; Ron Vachris (40-year lifer, ex-forklift driver at Price Club, then EVP/COO/President) becomes CEO.
• January 2024 — $15/share special dividend paid (~$6.7B).
• September 1, 2024 — First membership fee hike since 2017: Gold Star $60->$65, Executive $120->$130; Executive 2% cap raised from $1,000 to $1,250.
• Q1 FY2026 (quarter ended November 23, 2025) — Membership fee income $1.329B, +14% YoY (StockTitan); digital sales +20.5%.
• Q2 FY2026 — 924 warehouses across 14 countries (Statista); 18 more openings planned in FY2026.

What people say

The case for

The renewal rate itself is the argument. 92.2% in the US/Canada and 89.7% worldwide at Q3 FY2026 (Yahoo Finance, Globe & Mail) means the modal Costco member has stayed a member for well over a decade, and each incremental cohort has renewed at the same rate as the last one for the past decade. That is a level of retention no consumer subscription business — Netflix, Spotify, Amazon Prime, Peloton — matches. Longyield’s Substack piece “The $70B Quarter, 92.2% Renewal Rate, and Why the Membership Model Is Unbreakable” frames the case cleanly: fee income is a near-100%-margin annuity that has just re-based upward, Kirkland is a ~$90B private-label brand growing double digits at a share of company sales that has climbed from ~25% to ~33% over five years (Grocery Dive), and same-day delivery via Instacart in the US is now averaging <45 minutes with a 4.8/5 satisfaction rating (Costco / Instacart 2026 disclosures). Employees keep the throughput moving: $20/hr starting wage, $31.90/hr top scale for senior clerks in 2026 (Gridwise, Glassdoor), health and retirement benefits well above the retail median, and the lowest turnover in mass retail. Even Vachris — who was picked over a bench of internal candidates — has proven he can preserve the pricing rules and the merchant culture through a leadership handoff and a Galanti-Millerchip CFO change without a comp-sales dip.

The complaints

There are four durable strains of criticism. Successor / culture drift. With Sinegal retired since 2012, Brotman gone since 2017, Galanti retired in 2024 and Vachris still less than two years into the CEO role, the bench without a Price-lineage founder in the boardroom is thinner than it looks; Robin Report, Fox Business and multiple Reddit r/Costco threads have flagged incremental cuts (checkout receipt-checkers becoming stricter, ID enforcement at entry, portion drift on the $1.50 hot dog) as leading indicators. Kirkland quality complaints. Yahoo/Daily Meal and multiple viral Reddit threads document specific SKU degradation — woody / stringy chicken (customers escalated to Vachris directly), thinner Kirkland diapers (Fortune), Kirkland toilet paper mold reports and paper thinning, Kirkland Colombian cold-brew rejection, the square-milk-jug hate that has never gone away. Every single failure directly threatens the private-label trust that Kirkland’s ~$90B rests on. Delivery / e-commerce criticism. Same-day delivery via Instacart adds a real markup versus warehouse prices (Yahoo Lifestyle) and members have posted complaints about missing items and shopper substitutions; Costco.com search remains widely mocked as one of the worst site experiences among top-10 retailers (multiple 2024-2026 Reddit threads). The Scan & Pay pilot was catch-up to Sam’s Club, not leadership. Valuation-multiple critics. Seeking Alpha’s 2026 pieces argue explicitly that a ~50x P/E on a business decelerating toward 10% top-line and high-single-digit EPS growth is not defensible; TIKR’s “Is Costco Stock Overvalued in 2026” (December 2025) puts implied fair value materially below the ~$950 quote; Simply Wall St’s fair ratio has sat 20-50% below the traded multiple through 2025-2026. The bear point: even a company this good does not compound faster than its earnings, and today’s price has years of upside already booked.

Outlook: well positioned or at risk?

Well-positioned. Costco’s moat is not any single mechanic; it is the interlock of six of them at once. Membership fees ($5B+ annuity, near-100% incremental margin, 92%+ renewal) fund a capped-markup pricing rule that suppliers cannot successfully lobby out. That rule pulls throughput per SKU so extreme that Costco can force ~4,000 items to do the work of a Walmart Supercenter’s 140,000, which in turn creates the per-store labour productivity that pays $20+/hr wages that keep turnover low that keeps throughput up. Kirkland Signature — at ~$90B and ~33% of sales in 2025 — is the private-label expression of the same rule. And the 92.2%/89.7% US/international renewal rates mean the flywheel does not spin down. Sam’s Club is a good business, but is structurally behind on fee income and international expansion; BJ’s is a regional niche; Amazon Prime and Walmart+ compete for the delivery use case but not for the pallet-basket use case that anchors Costco’s tickets. The one legitimate risk is multiple compression: a 48-52x P/E on a business that will likely decelerate to high-single-digit top-line growth over the next three years is a real setup for a decade of muted stock returns even if the business keeps compounding. But that is an equity-return risk, not a franchise risk. The franchise is compounding at ~8% top-line and higher on the fee line, and there is no rival building anything that structurally re-underwrites the moat over the next five to ten years.

How to attack it

The wedge is not “warehouse club with an app.” That is Boxed’s grave. The wedge is a digitally-native, curated-SKU household-goods private-label brand priced for the ~54% of US households that do not have a warehouse-club membership and cannot amortise the $65 fee across enough trips to break even. Think Aldi’s private-label logic + Trader Joe’s SKU curation + a subscription-refill model + last-mile fulfilment out of local dark stores, aimed at renters and one-to-two-person urban households where Costco’s pallet packs are physically hostile.

The exploitable weaknesses that make this survivable against Costco’s counter-punch:

1. Format inflexibility. A ~150,000 sq ft warehouse pad on a suburban parking lot cannot serve dense urban households at small-basket sizes. Costco has never opened a small-footprint format and has publicly resisted the idea (Sinegal, then Jelinek, then Vachris on multiple earnings calls). The urban household is a channel it has structurally not built for.
2. App and search UX. Costco.com and the app are consistently rated among the worst top-10 retailer experiences (multiple 2024-2026 Reddit and industry-press threads). A digital-first competitor can win the discovery layer before Costco can build parity.
3. Delivery-margin leak. Instacart same-day delivery adds a documented markup versus warehouse pricing (Yahoo Lifestyle) — the value proposition breaks the moment the member is not physically in the warehouse. An attacker that owns its own last mile keeps that margin.
4. Kirkland quality cracks. The chicken, diaper, toilet-paper and cold-brew complaints are all in the last 24 months (Yahoo, Fortune, Daily Meal). A private-label attacker that builds specific quality guarantees against those categories has permission to enter that Kirkland’s brand has just gapped open.
5. CFO / CEO handoff exposure. Vachris (Jan 2024) and Millerchip (March 2024) are both less than two years into the seat. Fresh leadership always leaks a window of experimentation.
6. International whitespace. Costco has only 290 warehouses outside the US, and only 7 in China, 15 in Australia, 1 in Iceland. Country-specific attackers in Southeast Asia, LATAM and continental Europe can build density before Costco’s own build-out arrives.

None of this collapses Costco. But a well-funded attacker with a dark-store network and a strong owned-brand voice can pull the urban, renter, one-to-two-person household segment that Costco has structurally chosen not to serve.

Adjacent-segment play

The most interesting adjacent segment is membership-fee-funded SMB / small-business procurement. Costco already has 7+ million business memberships, but the interface it wraps them in is a warehouse floor and a Costco Business Center — a 1990s-era format that ignores everything the vertical B2B commerce category has learned in the last decade (Faire, Cheddar Up, Amazon Business, Alibaba, Restaurant Depot’s US East Coast build-out). The same capped-markup, private-label, fee-funded playbook — repointed at independent restaurants, cafes, coffee shops, hair salons, gyms, dental practices, or trades contractors — can carry very well: SMBs already pay for what amounts to a membership at Home Depot Pro, Restaurant Depot, US Foods CHEF’STORE and Amazon Business, and the private-label branded-good replacements for national-brand equivalents are precisely what SMB owners cannot economically shop for themselves. The adjacent-segment company already doing a version is Restaurant Depot (privately-held Jetro Cash & Carry, ~140 US locations by 2025) which serves independent restaurants only with membership dues and pallet pricing; it has not built the Kirkland-equivalent private label and it has almost no digital or delivery layer. A better-capitalised, private-label-forward SMB-club would be a legitimate green-field. Other adjacencies (a “Costco for luxury,” a “Costco for pharmacy”) are less attractive: luxury inverts the pricing logic that makes Costco work; pharmacy is already gross-margin-suppressed by PBM economics that no membership fee re-underwrites.

Sources and further reading

• Costco Q1 FY2026 press release: net income $2.001B, digital sales +20.5%, membership fee income +14% — StockTitan, December 11, 2025.
• Costco reports 8.1% increase in net sales for FY2025 ($269.9B revenue, $8.099B net income, comp sales +5.9%) — Quiver Quantitative, September 2025.
• Costco’s Renewal Trends Point to Lasting Customer Loyalty (92.7% US/Canada, 82.9M members at Q3 FY2026) — Yahoo Finance / Zacks, 2026.
• Costco Wholesale Corporation Announces Craig Jelinek Will Step Down as CEO; Ron Vachris Elected as New CEO — Costco Investor Relations, October 2023.
• Costco’s not-so secret weapon: How Kirkland Signature is driving growth and profits (~$90B, ~33% of sales) — CNBC, March 29, 2025.
• Costco Caps Its Own Markups. The Cap Is the Whole Business Model. (14% national-brand ceiling, 15% Kirkland) — Stratrix, 2024.
• Costco Raises Membership Fees on Sept. 1, 2024 — $60→$65 Gold Star, $120→$130 Executive — TODAY, July 2024.
• Number of Costco locations in the USA in 2026 (655 US warehouses, 924 global) — ScrapeHero, August 19, 2026.
• Costco vs. Sam’s Club in 2026: US warehouse-club share (~62% / ~31%) — MMCG Invest, 2026.
• Is Costco Stock Overvalued in 2026 After a 4% Decline Last Year? (~50x P/E critique) — TIKR, 2026.
• 10 Common Customer Complaints About Costco (Kirkland quality, checkout receipt-check, parking lots, app UX) — AOL Lifestyle, 2025.
• Cowen: Amazon Prime threatens Costco, Sam’s Club membership models — Retail Dive, 2016.