Bitcoin Dominance Surges as Altcoin Season Index Hits 37

The cryptocurrency market is experiencing a shift in favor of Bitcoin, with the Altcoin Season Index dropping to 37. This decline marks a significant decrease in investor enthusiasm for altcoins and indicates a strong Bitcoin season.

According to CoinMarketCap's Altcoin Season Index, which measures the performance of top 100 cryptocurrencies against Bitcoin over 90 days, only 37% of altcoins have outperformed Bitcoin in the last three months. This represents a significant drop from the 75% threshold needed for an altcoin season.

The index has trended downward since early 2025, reflecting a broader market rotation toward Bitcoin. As a result, trading volumes for altcoins have decreased, and prices have stagnated or declined. Many projects are experiencing double-digit losses, causing investors to prioritize capital preservation over speculative gains.