Inside Costco Wholesale (COST) Shares: Membership Fee Economics

Few retailers are as widely understood by shoppers and as widely misunderstood by investors as Costco Wholesale Corporation. Any serious Costco stock analysis has to begin with an unusual fact: the company deliberately makes very little money selling groceries, televisions and rotisserie chickens. The merchandise operation is run at markups that most retailers would consider unsustainable, and the profit that reaches shareholders comes disproportionately from a separate, recurring stream — the annual fee members pay simply for the right to walk through the door. Understanding how those two halves fit together explains most of what shows up in the financial statements.

Why a Costco Stock Analysis Starts With the Membership Fee

Costco charges a Gold Star membership fee of $65 a year in the United States, with an Executive membership at $130 a year that layers a $65 upgrade on top of the base fee and returns an annual reward on qualifying purchases. That fee is close to pure profit: the costs of running warehouses are already absorbed by the merchandise business, so incremental membership revenue drops toward the bottom line with very little offsetting expense.

The scale of this is easy to underestimate. In the third quarter of fiscal 2026 — the twelve weeks ended May 10, 2026, reported on May 28, 2026 — Costco generated membership fee income of $1.37 billion, up 10.7% year on year. Net income for the same quarter was $2.19 billion. In other words, a single recurring subscription line equivalent to roughly six-tenths of quarterly net income arrives before a single item is marked up. For the full 2025 fiscal year, ended August 31, 2025, membership fee income was $5.43 billion against net income of $8.1 billion.

The durability of that stream is what makes it valuable, and Costco discloses the relevant metrics directly. At the end of the fiscal third quarter the renewal rate stood at 92.2% in the US and Canada and 89.7% worldwide. Paid memberships reached 82.9 million households, up 4.1%, and total cardholders reached 149 million, up 4%. Executive memberships — the higher-fee tier — reached 41.2 million, up 9.6%, growing more than twice as fast as the overall base. Because Executive members pay double the base fee and historically spend more per visit, mix shift within the membership base matters as much to the fee line as headline household growth.

What the Most Recent Reported Numbers Show

Third-quarter fiscal 2026 net sales were $69.15 billion, an increase of 11.6%. Comparable sales rose 9.8% company-wide, and 6.6% after adjusting for gasoline price movements and foreign exchange — a gap worth noting, because fuel is a high-revenue, low-margin category that can flatter or depress the headline number without changing much about underlying demand. By region, comparable sales rose 9.4% in the United States, 10.7% in Canada and 11.2% across the rest of the international business. Digitally enabled comparable sales grew 21.5%.

Net income of $2.19 billion translated into diluted earnings per share of $4.93, up from $4.28 a year earlier, a 15% increase. Earnings growing faster than sales is a change of pattern for a business that has historically converted revenue growth into profit growth at roughly a one-to-one rate, and the operating line explains why: selling, general and administrative expense fell to 8.96% of sales, a 20 basis point improvement, while gross margin came in at 11.04%, down 21 basis points.

The trend has continued into the fourth quarter. For the July retail month — the four weeks ended August 2, 2026 — Costco reported net sales of $23.12 billion, up 10.7% from $20.89 billion. Total company comparable sales rose 8.9%, with the United States up 10.3%, Canada up 4.2% and other international up 6.0%. Excluding gasoline and currency effects, US comparable sales rose 6.9% and total company comparable sales 6.6%. Digitally enabled comparable sales were up 17.7% for the month.

The Economics of a Deliberately Thin Markup

A gross margin near 11% is the single most distinctive number in a Costco stock analysis. Broadline grocers and discounters typically run gross margins in the twenties; Walmart (WMT) and Target (TGT) both operate well above Costco's level. Costco caps markups on branded merchandise and holds them lower still on its own label, which means the merchandise business is closer to a cost-recovery operation than a profit engine.

The strategic logic is that price leadership drives traffic, traffic drives membership renewals, and renewals produce the fee income that actually funds returns to shareholders. It is a flywheel, and it explains why management treats a falling gross margin as acceptable, or even desirable, when it is the result of passing savings through to members rather than losing pricing power.

The Kirkland Signature private label is the sharpest expression of this. Costco has reported Kirkland Signature sales of roughly $90 billion in 2025, making it one of the largest consumer brands in the world by revenue and a substantial share of total merchandise sales. Private label typically carries a higher gross margin than the national brands it displaces, even at Costco's lower price points, which gives the company a lever it can pull in either direction: widening margin, or cutting shelf prices while holding margin flat.

Warehouse Growth and International Exposure

Costco's growth is not primarily a same-store story; new warehouses matter. The company reported 933 warehouses across 14 countries in its July 2026 sales release. It began fiscal 2026 with 914 and has guided to roughly 940 by year end, with about 35 openings planned during the year including five relocations. That is mid-single-digit unit growth compounding on top of comparable sales.

Geographic mix is a live variable. The United States and Puerto Rico account for the large majority of the estate, with Canada, Mexico, Japan, the United Kingdom, Korea, Australia, Taiwan and China making up most of the balance. International warehouses have historically produced strong membership economics, but they also introduce currency translation into reported results — visible in the roughly three-point gap between headline and currency-adjusted comparable sales in the third quarter — and expose the company to local competitive structures that differ markedly from the US club channel, where BJ's Wholesale Club (BJ) is the closest direct analogue.

Balance Sheet, Dividend and Capital Returns

Costco funds this expansion from an unusually conservative financial position. At May 10, 2026 the company held $18.95 billion of cash and cash equivalents plus $1.05 billion of short-term investments, against long-term debt of $5.67 billion. Total assets stood at $86.43 billion and shareholders' equity at $33.51 billion. Net cash on the balance sheet is a structural feature rather than a temporary one, and it is what has periodically allowed the board to pay large special dividends alongside the regular payout.

On the regular dividend, the board announced on April 15, 2026 an increase in the quarterly cash dividend from $1.30 to $1.47 per share, an annualized rate of $5.88 and an increase of roughly 13%. The dividend was payable on May 15, 2026 to shareholders of record on May 1, 2026. Against fiscal 2025 diluted earnings per share of $18.21, an annualized $5.88 represents a payout ratio comfortably below a third of earnings, leaving most of the cash flow available for warehouse construction, inventory and the balance sheet.

Valuation, Risks and What to Watch

Valuation is where Costco generates the most debate. As of August 5, 2026 the shares traded at $941.99, giving a market capitalization of approximately $432 billion and a trailing price-to-earnings ratio of roughly 47 times. A trailing P/E measures the price paid today for each dollar of the past twelve months' earnings; at 47 times, the multiple sits well above Costco's own ten-year average and well above the broad market. That figure is a fact about the current price, not a judgment about it — what it tells you is that the market is capitalizing the membership annuity and the unit growth runway rather than valuing Costco on retail-sector norms.

Several things would change the picture. The first is the renewal rate: at 92.2% in the US and Canada it sits near historical highs, and a sustained decline of even a point or two would undercut the premise that fee income is annuity-like. The second is fee timing. Costco raised US and Canadian membership fees in 2024, and because the income is recognized over the twelve-month membership term, the earnings benefit of any increase phases in and then laps. Investors tracking membership fee income growth need to separate the underlying household and mix growth from the arithmetic of a price increase working through.

The third is margin discipline under cost pressure. Tariffs, freight and food input inflation all press on a business running an 11% gross margin, where there is little cushion to absorb costs without either raising shelf prices or accepting a thinner spread. Costco has generally chosen to absorb and pass through, which protects traffic at the expense of merchandise profitability. The fourth is the gasoline and currency distortion in reported comps — a reason to weight the adjusted figures when assessing demand. The fifth is execution on new warehouses: unit growth is a meaningful part of the algorithm, and a slower opening cadence or weaker productivity from new sites would show up in comparable sales and fee income with a lag.

Conclusion

A Costco stock analysis that stops at the income statement misses the mechanism. The merchandise business exists to generate traffic and renewals; the membership fee, at $1.37 billion in the most recent quarter and $5.43 billion in fiscal 2025, is what converts that traffic into profit. The evidence in the latest disclosures is of a business executing that model at scale — 11.6% net sales growth, 15% earnings per share growth, a 92.2% North American renewal rate, 41.2 million Executive members and a net cash balance sheet funding roughly 35 warehouse openings a year.

The variables worth monitoring are correspondingly specific: whether renewal rates hold as fee increases lap, whether membership fee income keeps compounding at a high single-digit to low double-digit rate once price effects wash out, whether gross margin holds near 11% as input costs move, and whether the pace of warehouse openings and their productivity sustain the unit growth contribution. Those metrics, reported monthly and quarterly, are where the thesis is tested — and where the gap between the operating record and the multiple the market currently assigns it will be resolved one way or the other.