Costco Wholesale Corporation operates a global network of membership-based warehouse clubs, selling branded and private-label merchandise across the United States, Canada, Mexico, Japan, the United Kingdom, South Korea, Taiwan, Australia, Spain, France, Iceland, and China, supplemented by pharmacies, optical centers, food courts, hearing aid centers, tire installation, 636 gas stations, and e-commerce operations.
COST is 21% below fair value and in its buy zone. Consider adding to your position.
QuantHub Research: Investment Thesis
Scaling Phase
Costco Wholesale Corporation operates a global network of membership-based warehouse clubs, selling branded and private-label merchandise across the United States, Canada, Mexico, Japan, the United Kingdom, South Korea, Taiwan, Australia, Spain, France, Iceland, and China, supplemented by pharmacies, optical centers, food courts, hearing aid centers, tire installation, 636 gas stations, and e-commerce operations. The business quality is high: membership fees anchor a recurring profit pool, TTM gross margin is 17.5%, TTM operating margin is 3.9%, TTM net margin is 3.0%, ROE is 28.0%, and revenue grew 11.1% year over year in the most recent quarter while earnings grew 14.9% in the most recent quarter. The shares trade at $896.48 against a blended fair value estimate of $1117.50, implying 24.7% upside, with a P/S of 1.31, trailing P/E of 43.14, P/FCF of 42.38, and EV/EBITDA of 32.69. The valuation regime is characterized as fair versus five-year history, and analyst consensus is Strong Buy with a $1117.5 average target, also 24.7% above the current price. The tension is that a premium multiple on a 3.0% net margin retailer leaves limited room for error, but the membership model, renewal rates, and digitally enabled sales momentum support the case that the shares are undervalued versus blended fair value even if they look full on trailing multiples.
Costco is not cheap on trailing multiples: 43.14x trailing earnings, 42.38x price to free cash flow, and 32.69x EV/EBITDA are premium levels for a discount retailer with a 3.0% TTM net margin. The market is paying for membership-fee recurrence, 92.2% U.S. and Canada renewal rates and 89.7% worldwide renewal rates cited in prior research, and consistent comparable-sales growth, including 6.6% FY2026 adjusted comparable sales excluding fuel and foreign exchange and 19.5% digitally enabled sales comps in the latest quarter. The gap between the historical-multiple regime, which labels the stock fair, and the blended fair value estimate of $1117.50, which implies 24.7% upside, is the core mispricing: the shares are undervalued versus blended fair value even though they screen expensive versus their own five-year history. Analyst consensus is Strong Buy with a $1117.5 average target, matching the fair value estimate, which suggests the sell side sees the same disconnect.
12–18 Month Outlook
In 18 months, Costco should still be a membership-driven warehouse retailer with revenue growth in the high single digits to low double digits, supported by the 11.1% year-over-year revenue growth in the most recent quarter and 14.9% earnings growth in the most recent quarter. The key question is whether the premium multiple compresses: at 43.14x trailing earnings and 42.38x price to free cash flow, the stock needs continued membership renewal strength, stable merchandise margins, and no tariff or consumer-spending shock to justify the current price. If those conditions hold, the 24.7% upside to the $1117.50 blended fair value estimate is achievable, and analyst consensus is Strong Buy with a matching $1117.5 target. If comparable sales slow from the 6.6% FY2026 adjusted pace excluding fuel and foreign exchange, or if tariff-refund litigation produces an adverse outcome in a given quarter, the multiple could compress and the shares could trade closer to the current price or below it.
Bull vs Bear
Bull Case
Membership renewal rates remain exceptionally strong at 92.2% in the United States and Canada and 89.7% worldwide, providing a recurring, high-margin fee stream that underpins earnings visibility.
Revenue grew 11.1% year over year in the most recent quarter and earnings grew 14.9% in the most recent quarter, showing double-digit top-line and bottom-line momentum despite a low-margin retail model.
Digitally enabled sales comps reached 19.5% in the latest quarter, indicating that e-commerce and omnichannel initiatives are scaling faster than the core warehouse business.
The blended fair value estimate of $1117.50 implies 24.7% upside from the current $896.48 price, and analyst consensus is Strong Buy with a matching $1117.5 average target.
ROE of 28.0% demonstrates efficient capital deployment and a business that generates strong returns on shareholders' equity even at a 3.0% TTM net margin.
Bear Case
The stock trades at 43.14x trailing earnings, 42.38x price to free cash flow, and 32.69x EV/EBITDA, leaving little tolerance for any slowdown in sales, renewals, or margin performance.
Competition from Walmart, Sam's Club, Amazon, and BJ's Wholesale Club is vigorous, and competitive pricing actions can constrain merchandise margins despite Costco's scale.
Tariffs, global supply-chain disruption, commodity inflation, and wage pressure can raise merchandise and operating costs, and Costco's low-price positioning may limit its ability to pass these costs through without margin pressure.
A weaker consumer environment could reduce discretionary general-merchandise demand and comparable-sales growth, particularly with FY2026 adjusted comparable sales at 6.6% excluding fuel and foreign exchange.
Consumer litigation related to potential IEEPA tariff refunds remains unresolved, and while Costco does not expect pending litigation in aggregate to have a material adverse effect, an adverse outcome could materially affect an individual quarter or year.
Leadership & Competitive Position
Ron Vachris
Tenure3 yrs
Beats guidance75% of qtrs
Capital allocationGood
Ron Vachris serves as CEO of Costco Wholesale Corporation, leading a membership-based warehouse retailer with 341,000 full-time employees and operations across more than a dozen countries. The company has a long history of disciplined capital allocation, consistent membership-fee growth, and steady warehouse expansion, though the current research does not disclose specific insider ownership or detailed capital return figures.
Competitive Moat
stable
cost advantagebrandswitching costs
Costco operates a global network of membership warehouses with 636 gas stations and a presence across the United States, Canada, Mexico, Japan, the United Kingdom, South Korea, Taiwan, Australia, Spain, France, Iceland, and China. The company competes with Walmart, Sam's Club, Amazon, and BJ's Wholesale Club, and its membership renewal rates of 92.2% in the United States and Canada and 89.7% worldwide indicate strong customer retention within its warehouse-club format.
Competitors: Walmart (WMT), Amazon (AMZN), BJ's Wholesale Club (BJ)
Disruption: Low to Medium. E-commerce competition from Amazon and omnichannel investments by Walmart are real, but Costco's 19.5% digitally enabled sales comps in the latest quarter show it is participating in the shift rather than being disrupted by it.
QuantHub Research
Valuation
Multiple
Current
Median 3yr
Median 5yr
Min 5yr
Max 5yr
P/E
43.14x
51.72x
46.02x
38.38x
53.76x
P/S
1.31x
1.52x
1.28x
1.0x
1.56x
P/FCF
42.38x
53.44x
56.6x
35.81x
67.3x
P/S 1.31x vs 5yr range 1.0-1.56x (P25=1.0x, median=1.28x, P75=1.56x)
Price Outlook (5-Year)
Bear
$894
-0.6%/yr
Base
$1118
3.9%/yr
fair value
Bull
$1341
7.8%/yr
Bear/Base/Bull anchored to QuantHub fair value estimate. Base = headline fair value; Bear −20%; Bull +20%.
Costco's next quarterly results will test whether the 11.1% revenue growth and 14.9% earnings growth from the most recent quarter can be sustained, and whether digitally enabled sales comps remain near the 19.5% level.
medium
2026-H2
Membership renewal rate disclosures
Renewal rates of 92.2% in the United States and Canada and 89.7% worldwide are central to the profit model, and any change in these figures would be a key signal for membership-fee growth.
medium
2026-H2
Tariff-refund litigation resolution
Consumer litigation related to potential IEEPA tariff refunds remains unresolved, and an adverse outcome could materially affect an individual quarter or year.
medium
Risks
Competitive pressure
high
Costco identifies competition as vigorous, with Walmart, Sam's Club, Amazon, and BJ's Wholesale Club among meaningful alternatives, and competitive pricing actions can constrain merchandise margins despite higher costs.
Valuation compression
high
At 43.14x trailing P/E, 42.38x P/FCF, and 32.69x EV/EBITDA, the shares have limited tolerance for a slowdown in sales, renewals, margin performance, or investor appetite for premium consumer-defensive equities.
Tariffs and supply-chain costs
medium
Tariffs, global supply-chain disruption, commodity inflation, and wage pressure can raise merchandise and operating costs, and Costco's low-price positioning may limit its ability to pass these costs through without margin pressure.
Consumer spending slowdown
medium
A weaker consumer environment could reduce discretionary general-merchandise demand and comparable-sales growth, particularly with FY2026 adjusted comparable sales at 6.6% excluding fuel and foreign exchange.
Membership growth and renewal risk
medium
Membership fees are central to Costco's profit model, and a decline from renewal rates of 92.2% in the United States and Canada and 89.7% worldwide, or slower member acquisition, would weaken recurring fee growth.
Tariff-refund litigation
medium
Consumer litigation related to potential IEEPA tariff refunds remains unresolved, and while Costco does not expect pending litigation in aggregate to have a material adverse effect, an adverse outcome could materially affect an individual quarter or year.
Growth Engines
Membership fee incomemature
Membership fees are central to Costco's profit model, with renewal rates of 92.2% in the United States and Canada and 89.7% worldwide providing a recurring, high-margin revenue stream.
Digitally enabled salesscaling
Digitally enabled sales comps reached 19.5% in the latest quarter, with six categories driving the growth, indicating a meaningful omnichannel opportunity relative to the core warehouse business.
International warehouse expansionscaling
Costco operates across the United States, Canada, Mexico, Japan, the United Kingdom, South Korea, Taiwan, Australia, Spain, France, Iceland, and China, leaving room for continued international store growth.
Fresh and ancillary servicesmature
Fresh departments, pharmacies, optical clinics, food courts, hearing aid centers, tire installation, and gas stations deepen basket size and visit frequency beyond core merchandise.
Costco reports double-digit improvements in key fundamentals and beats analyst estimates in its final quarter of 2026
The company posted double-digit improvements in key fundamentals and beat analyst estimates, supporting the case that the membership model and digitally enabled sales momentum remain intact.
2026-09-25
Six categories drive 19.5% digitally enabled sales comps in the latest quarter
Digitally enabled sales comps of 19.5% show that Costco's e-commerce and omnichannel initiatives are scaling faster than the core warehouse business, which is important for defending against Amazon and Walmart.
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QuantHub research is focused on quality businesses with durable competitive advantages — companies we'd want to own for 3–5 years or more. We are not short-term traders. Every analysis is built around a single question: is this a great business available at a reasonable price for a long-term investor?
We start where most analysts finish: the fundamentals. For every company, our AI ingests years of financial statements — revenue, margins, free cash flow, and how the business has been valued by the market across multiple cycles. But numbers alone don't tell you whether a business is worth owning.
The harder work is qualitative. We assess the competitive moat: is it widening or eroding? We read the leadership track record — how capital has been allocated, whether management has earned trust through consistent execution. We look at what the market is afraid of, and whether that fear is priced in fairly or irrationally.
Valuation is always relative. A stock is cheap or expensive compared to its own history. We build scenario matrices anchored to 5-year historical multiples, then ask: what has to go right for the upside case, and what's the floor if it doesn't?
Finally, we write an 18-month forward outlook — not a price target, but a mental model of where this business will be and what the narrative will look like. Every note is dated and versioned. When material facts change, we update the thesis.
Frequently Asked Questions
Is COST undervalued?
Yes, COST appears undervalued at the current price of $922.76, trading below our fair value estimate of $1,117.50 (+21% upside). QuantHub considers this a buy zone.
What is COST's fair value?
QuantHub Research estimates COST's fair value at $1,117.50 based on our proprietary valuation model incorporating historical P/S, P/E, and P/FCF multiples over a 5-year range.
What are the key risks for COST?
Competitive pressure: Costco identifies competition as vigorous, with Walmart, Sam's Club, Amazon, and BJ's Wholesale Club among meaningful alternatives, and competitive pricing actions can constrain merchandise margins despite higher costs. Valuation compression: At 43.14x trailing P/E, 42.38x P/FCF, and 32.69x EV/EBITDA, the shares have limited tolerance for a slowdown in sales, renewals, margin performance, or investor appetite for premium consumer-defensive equities. Tariffs and supply-chain costs: Tariffs, global supply-chain disruption, commodity inflation, and wage pressure can raise merchandise and operating costs, and Costco's low-price positioning may limit its ability to pass these costs through without margin pressure.
What is the bull case for COST?
Membership renewal rates remain exceptionally strong at 92.2% in the United States and Canada and 89.7% worldwide, providing a recurring, high-margin fee stream that underpins earnings visibility. Revenue grew 11.1% year over year in the most recent quarter and earnings grew 14.9% in the most recent quarter, showing double-digit top-line and bottom-line momentum despite a low-margin retail model. Digitally enabled sales comps reached 19.5% in the latest quarter, indicating that e-commerce and om
How confident is QuantHub in COST?
QuantHub has moderate conviction in COST. Research last updated 2026-09-25.