Costco Sales Growth Strong, but Stock Weakens; Wait for Margin Clarity

What happened

Costco reported Q3 net sales up 11.6% with ex-gas/FX comps of 6.6% and membership renewals at 92.2% US/Canada, but the stock fell as the market appears to be pricing in perfection at 49x P/E and focusing on gross margin compression (11.04% vs 11.25% last year). The fee hike tailwind is fading, contributing 25% of Q3 fee growth and set to lap, while digital penetration (21% comps) drives sales but management discloses lower margins. The DeepValue report maintains a WAIT rating with an attractive entry at $875, waiting for either a valuation reset or proof of margin and renewal stability. The defensive growth narrative is intact, but the premium multiple leaves no room for error, and upcoming monthly sales prints and Q4 results will be critical. Investors should hold but not add until clearer signals emerge.

Implication

Costco's defensive growth narrative remains intact, but the stock's premium pricing (49x P/E) and emerging headwinds from digital mix and fee hike lap suggest limited near-term upside. Investors should wait for either a pullback to ~$875 or confirmation that gross margin can stabilize above 11% and renewal rates hold above 92%. The next 2-3 months' monthly sales prints and Q4 earnings will be key catalysts. Holding existing positions is acceptable given the business quality, but new money should be patient.

Thesis delta

No material shift; the recent news reinforces the existing WAIT thesis. The 12% sales growth and high renewals are already embedded in the valuation, and the stock's decline highlights the market's sensitivity to any signs of deceleration or margin pressure.