Costco posts third-quarter fiscal 2026 results Thursday after the close, and the print is the most-watched warehouse-club number of the year for a simple reason: the stock is trading at roughly 56x forward earnings after a 26% year-to-date run, and the consensus build assumes momentum holds. Analysts are looking for revenue near $69.3 billion (up about 9% year-over-year) and adjusted EPS in the $4.56–$4.98 range (up roughly 13%), per TradingKey's earnings preview. Options markets are pricing about a 3.65% move in either direction on the print, as TipRanks noted.

The April tape is already on the board

The most important pre-print data point is already public. Costco's April net sales hit $23.92 billion, a 13% year-over-year increase, per the company's monthly disclosure — well above the 9% consensus for the full quarter. That means the comp setup going into Thursday is asymmetric to the upside: a clean beat on revenue is effectively pre-baked, and the question is whether margin and membership confirm the volume.

That volume number is also why the digitally enabled comp growth is the second-most-watched line item on Thursday's release. April's digitally enabled comps rose 18.8%, and the fiscal-year-to-date number through the first 35 weeks is 21.6%, TheStreet noted. That's the line item that has the most leverage on the multiple — if e-commerce continues to compound at a 20%+ clip, the bull case for the 56x P/E gets easier to argue.

Membership is the load-bearing wall

The single metric that the analyst community will scrutinize hardest isn't the comp. It's the membership renewal rate. Costco raised its annual membership fee for the first time in seven years last summer, and the Q3 print is the first full quarter where the new fee structure runs through both the renewal cohort and the membership fee revenue line. The renewal-rate sensitivity to a $5–$10 increase is the kind of detail that doesn't matter in any given month but compounds across the duration of the membership annuity.

Costco's renewal rate sat above 90% globally and above 92% in North America the last time the company disclosed it. Holding that level — or extending it — confirms that the price hike was absorbed without measurable defection. A 50-basis-point slip would be the first real warning sign that even Costco's pricing power has a ceiling, and it would arrive in a quarter where the Conference Board's May confidence index dropped to 93.1 and two-thirds of consumers told the survey they were cutting back on spending.

What the print does to Costco's relative position

There's a strategic angle to this print that's bigger than the quarter. Walmart already reported May 21, Target on May 21, and Home Depot, Lowe's, and the off-price names earlier in the cycle. The general read is that consumer staples and value-tier retailers are over-earning relative to discretionary, as CNN summarized in its weekend wrap. A clean Costco beat-and-raise reinforces that pattern and pushes the multiple gap between warehouse-club, mass, and department-store wider than it already is.

The risk is the opposite outcome. A Costco that prints in line on revenue but soft on margin — or a renewal rate that slips by even a fraction — recasts the print as "the bellwether is decelerating," and that headline does more damage at 56x than it would at 30x. The setup is the kind that rewards conservative guidance more than aggressive results. GuruFocus's preview flagged the multiple compression risk explicitly, and traders we spoke to over the weekend were already pricing more downside than upside skew despite the strong April monthly.

The two-minute take

Beats: revenue (very likely given April), e-commerce growth (very likely given the 35-week run-rate), and membership fee revenue (mechanical from the fee hike).

Misses to watch: gross margin (the tariff math hits private-label Kirkland goods), renewal rate (the price-elasticity test), and any commentary on traffic-versus-ticket mix (the consumer-health tell).

If you only watch one number Thursday evening, watch the membership renewal rate. It's the single best read on whether the Costco moat is widening or narrowing — and at 56x, the moat is the multiple.