Over the past year, the cryptocurrency market has shown a stark contrast with the U.S. stock market. The S&P 500 and Nasdaq 100 indices have recorded cumulative gains of 47% and 49% over two years, respectively, while the Altcoin index has been mired in a decline. The crypto market is undergoing a structural shift where capital is concentrating toward high-quality assets.
The S&P 500 rose by 25% and 17.5% in 2024 and 2025, respectively, while the Nasdaq 100 gained 25.9% and 18.1% during the same periods, with maximum drawdowns of only around 15%.
In contrast, the altcoin market saw the CoinDesk 80 Index (tracking 80 crypto assets outside the top 20) plummet by 46.4% in the first quarter of 2025, and as of mid-July, it was down 38% year-to-date.
The MarketVector Digital Assets 100 Small-Cap Index even fell to its lowest level since November 2020 by the end of 2025, with the total crypto market capitalization evaporating by over $1 trillion.
The core of this contrast lies in the 'imbalance in returns amid high correlation.' The CoinDesk 5 Index (tracking mainstream coins like Bitcoin) and the CoinDesk 80 Index have a correlation as high as 0.9, moving in sync but with vastly different returns—the former rose by 12%-13% during the same period, while the latter fell by nearly 40%.
The gap in risk-adjusted returns is even more stark. The Altcoin index exhibits volatility comparable to or higher than that of U.S. stocks but has recorded significant negative returns, resulting in a negative Sharpe ratio; meanwhile, U.S. stock indices have maintained positive Sharpe ratios.
Over the past five years, the MarketVector Small-Cap Crypto Index has delivered a return of -8%, while the large-cap crypto index has surged by 380%, clearly indicating that institutional capital is voting with its feet.
Kaiko data shows that although altcoin trading volume has rebounded to 2021 levels, 64% of it is concentrated in the top 10 altcoins, with 'institutional-grade' assets like Solana and XRP, which have clearer regulatory clarity, emerging as the few winners.
Capital is not exiting the crypto market but is instead flowing up the quality curve, with Bitcoin and Ethereum spot ETFs continuously attracting institutional inflows.
For investors, diversifying into altcoins has now lost its meaning. The nearly 0.9 correlation between the CoinDesk 5 and CoinDesk 80 indices means that holding altcoins does not provide diversification benefits but instead entails additional risks.
The sharp volatility of the 'Altcoin Season' index, which plummeted from 88 to 16 at the end of 2024, further confirms its tactical trading nature rather than its suitability as a long-term allocation asset.
The market logic has now fundamentally shifted: capital is no longer favoring niche altcoins but is instead focusing on high-quality assets with regulatory clarity and sufficient liquidity.
Bitcoin and Ethereum have gained institutional recognition through ETFs, while U.S. stocks have attracted capital with their stable returns. Together, they are squeezing the生存 space of inferior altcoins.
