Altcoin Season Index Stays at 25, Highlighting Bitcoin Dominance and Selective Altcoin Gains

Nov 27, 2025, 1:05 a.m. 5 sources neutral

The Altcoin Season Index, created by CoinMarketCap, remains firmly at 25 out of 100, signaling continued Bitcoin dominance in the cryptocurrency market. This metric tracks whether 75% of the top 100 cryptocurrencies (excluding stablecoins and wrapped tokens) have outperformed Bitcoin over a 90-day period, with values near 100 indicating altcoin season.

Historical data reveals the index was at 23 yesterday, 31 last week, and 25 last month, with an annual high of 87 in December 2024 and a low of 12 in April 2025. Bitcoin's 90-day return is approximately -23.16%, yet several altcoins have posted impressive gains, including ASTER at +1266.28%, ZEC at +1043.00%, and DASH at +137.06%. Conversely, underperformers like BSV, TRX, and ICP saw double-digit declines.

The index serves as a tool for investors to identify market cycles, assess risk, and time portfolio rebalancing, emphasizing that while Bitcoin leads, opportunities persist in researched altcoins during dominance phases.

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