Bitcoin (BTC) expanded its share of the crypto market to 60.3% over the week to Nov. 10 as CoinMarketCap’s Altcoin Season Index dropped to 38, signaling weaker altcoin performance against Bitcoin.
CoinMarketCap’s market-share figures put Bitcoin at 60.3%, up from 60.0% the previous week. Ether (ETH) accounted for 10.3%, down from 10.6%, while other altcoins combined edged to 29.3% from 29.4%.
The index was at 38 on Nov. 10, unchanged from the previous day. It had read 47 a week earlier and 63 one month earlier. A reading of 38 means 38% of the eligible top-100 assets beat Bitcoin over the 90-day period; stablecoins are excluded.
CoinMarketCap classifies readings of 75 or higher as altcoin season and scores of 25 or lower as Bitcoin season, leaving 38 between those thresholds. Over the preceding year, the index recorded a low of 14 on Dec. 19, 2025, and a high of 64 on Sept. 27, 2026.
The 90-day score tracks the breadth of relative performance: It counts how many eligible coins did better than Bitcoin, rather than how large their gains or losses were. An altcoin can rise in dollar terms and still fail to outperform Bitcoin over the period. The market-share figures offer a separate view, showing how much of the market’s total value each asset group represents.
CoinMarketCap’s measure uses a different asset basket from BlockchainCenter’s index, which tracks an eligible 50-coin group, as EconoTimes has explained. The two gauges can therefore report different readings.
