A backtest of investment returns for two retail titans shows substantial divergence in performance. An investment of $5,000 into Amazon stock three years ago would be worth approximately $16,300 as of 16:44 UTC today. A parallel $5,000 investment in Costco Wholesale would be valued at roughly $16,200. These figures, calculated from share price appreciation and excluding dividends, were reported in a recent market analysis. Both returns significantly outpace the broader S&P 500 index over the same period, underscoring the power of selective mega-cap equity exposure during a volatile economic cycle characterized by shifting consumer behavior and rapid technological adoption.
Context — why this matters now
Long-term performance comparisons of leading consumer stocks provide crucial insight into evolving market leadership and business model durability. The three-year window ending in mid-2026 encapsulates a period of post-pandemic normalization, aggressive monetary policy tightening by central banks, and the mainstreaming of generative AI technologies. For consumer discretionary and consumer staples sectors, this era tested pricing power, membership loyalty, and logistics efficiency under sustained inflationary pressures.
Key catalysts for Amazon’s performance included the stabilization and subsequent growth of its high-margin AWS cloud division after a 2023-2024 slowdown, coupled with relentless gains in advertising revenue that bolstered overall profitability. For Costco, the primary driver was consistent, double-digit comparable sales growth fueled by its value proposition during inflation, which expanded its membership base and renewal rates to record levels. The current macro backdrop features a Federal Reserve policy rate in a holding pattern, with equity markets rewarding companies demonstrating clear paths to earnings growth irrespective of sector classification.
Data — what the numbers show
The raw numbers illustrate a powerful compounding effect for both companies, though their paths differed. Amazon shares closed at $255.74, a gain of 3.33% for the trading session. Costco shares finished at $939.02, up 1.87%. Amazon’s journey involved greater volatility, with a significant drawdown in 2024 during the AWS growth scare, but powered by a stronger finish. Costco’s trajectory was characterized by more consistent, stair-step appreciation.
| Metric | Amazon (AMZN) | Costco (COST) | S&P 500 Proxy (SPY) |
|---|
| Approx. Price 3Y Ago (July 2023) | ~$78.50 | ~$290.00 | ~$450.00 |
| Price on 16 July 2026 | $255.74 | $939.02 | ~$615.00 |
| 3-Year Return | ~226% | ~224% | ~37% |
| $5,000 Investment Today | ~$16,300 | ~$16,200 | ~$6,850 |
Both stocks dramatically outperformed the broader market, which returned just over a third of their gains. This outperformance translated into massive market capitalization expansion. Amazon’s market cap grew by over $1.5 trillion during the period, while Costco’s increased by approximately $450 billion. The performance narrows the historical performance gap, bringing Costco’s long-term returns closer to the tech-driven gains of Amazon.
Analysis — what it means for markets / sectors / tickers
The parallel success of Amazon and Costco validates two distinct but powerful mega-cap retail models: ecosystem-driven technology and subscription-based value retail. This has second-order effects for related sectors and tickers. Pure-play e-commerce and retail competitors like Walmart and Target face intensified pressure, as investors flock to the clear winners demonstrating superior scale and business model economics. Cloud and software providers like Microsoft and Google benefit from the renewed investor focus on enterprise tech spend that powered Amazon’s rally.
A key risk to the continued outperformance is valuation compression, particularly for Amazon, whose forward P/E ratio expanded significantly during its rally. A slowdown in consumer spending or a recession could disproportionately impact its higher-multiple segments like AWS and advertising. Market positioning data shows institutional investors have maintained large net long positions in both names throughout the period, with recent options flow indicating continued bullish sentiment on Costco into its next earnings report. Flow is rotating away from mid-cap retailers and into these two dominant players, a trend likely to persist absent a major macroeconomic downturn.
For more on institutional positioning flows in mega-cap equities, visit Fazen Markets.
Outlook — what to watch next
Immediate catalysts will determine if the three-year momentum can persist. Amazon reports Q2 2026 earnings on July 24, with the key watch item being AWS revenue growth guidance for the second half of the year. Costco reports monthly sales figures on August 7, providing a real-time pulse on consumer resilience and membership trends. The Federal Open Market Committee meeting on July 30 will set the interest rate tone for the quarter, impacting the discount rates applied to future earnings of growth stocks like Amazon.
Technically, Amazon faces initial resistance near its intraday high of $258.08, with a decisive break above potentially opening a path toward the $275-280 zone. For Costco, the $940 level represents immediate resistance after touching $939.50; sustained trade above this psychologically important round number could fuel the next leg higher. Support for Amazon sits at the $250 level, while Costco’s support is evident near its 50-day moving average, currently around $915. A breach of these levels on high volume would signal a potential consolidation phase.
Frequently Asked Questions
How do these returns account for stock splits and dividends?
The return calculations are based on share price appreciation and do not include dividends, which would modestly increase the total return figures, particularly for Costco which pays a quarterly dividend. Amazon does not pay a dividend. Neither company executed a stock split during the three-year period in question, so split-adjusted prices are not a factor. The figures represent capital gains only, providing a clear comparison of underlying business value expansion.
Is it too late to invest in Amazon or Costco after such big gains?
Timing any market is challenging. The decision hinges on future growth prospects, not past performance. Investors must assess whether the catalysts that drove the last three years of gains—AWS re-acceleration for Amazon, membership fee economics for Costco—remain intact and are not fully priced into current valuations. A disciplined approach involves analyzing forward price-to-earnings ratios relative to historical ranges and projected earnings growth rates. Dollar-cost averaging can mitigate timing risk for long-term holders.
How does this performance compare to other famous long-term holdings like Apple or Berkshire Hathaway?
