If You Buy Costco Stock With $10,000 Today, I Predict It Could Be Worth $13,400 in 5 Years

Costco’s EPS growth is expected to decelerate, with diluted EPS rising at ~11.1% annually (fiscal 2025–2028) and then growing ~10% CAGR (fiscal 2026–2031), versus 12.4% over the prior five years. Same-store sales remain strong, up 8.9% in July, alongside expansion of ~30+ net new warehouses per year and a growing membership base to 82.9M households. However, valuation is rich (P/E 48.1, down 24% from 63.2), and the article flags a potential ~17% valuation multiple headwind as the P/E gravitates toward ~40, implying downside to equity returns if the S&P 500’s performance repeats.

Analysis

COST’s core earnings engine is still fine; the market risk is that the stock has already capitalized that durability at a premium that assumes near-perfect execution. When a mature retailer trades like a secular compounder, the next leg of returns becomes a multiple story, not an operating story, and that usually ends badly once growth normalizes. The second-order loser is not necessarily the consumer basket broadly, but other high-quality defensive retailers with less crowded ownership and lower starting multiples, especially WMT and BJ, which can absorb flows if investors rotate away from “quality at any price.”

The key catalyst path is valuation re-rating, not a fundamental break. Over the next 1-3 quarters, the stock can still grind higher if traffic remains resilient, but the upside is increasingly capped unless membership economics or unit growth reaccelerate meaningfully; over 6-18 months, the likely regime is multiple compression as the denominator becomes too large for mid-teens EPS growth to justify. The main falsifier is a fresh comp reacceleration plus pricing power that supports another fee step-up without churn, which would keep the premium intact.

Consensus is missing that “defensive” can become a crowded factor trade. If rates stay sticky or risk appetite improves, capital may migrate from expensive staples-like compounders into cyclicals and cheaper retailers, pressuring COST’s relative performance even if fundamentals stay healthy. The contrarian bull case is that a recessionary scare would reassert the scarcity value of Costco’s model, but that’s a timing trade, not a valuation cure.

Key Decisions for Investors

• Trim/underweight COST on strength over the next 1-3 months; if the stock keeps trading above a premium multiple relative to its own history, expect low-teens downside in relative performance even without an earnings miss.
• Pair trade: long WMT / short COST for 3-6 months. WMT offers similar defensiveness with a lower starting valuation and better optionality from grocery/digital mix; use this as a relative-value hedge against premium compression.
• For existing COST longs, buy a 6-12 month put spread or collar into any post-earnings volatility to protect against multiple re-rating; risk/reward is attractive if the market starts paying closer attention to growth deceleration.
• Set an alert on next membership-fee or comp commentary: if same-store sales falls back toward mid-single digits or churn rises, the thesis for a premium multiple weakens materially.