Chart Echoes 2017 and 2021 Altcoin Setups as BTC Dominance Rises

An analyst using the handle el_crypto_prof published a weekly chart of total altcoin market capitalization excluding Bitcoin that shows a structure similar to patterns that preceded the 2017 and 2021 altcoin rallies. Total altcoin market capitalization is near $1.06 trillion.

The chart highlights three similar multi-year setups. In 2015–2016 altcoins built an accumulation base, climbed an ascending trendline and printed a fakeout below the line in late 2016 before the 2017 run. In 2019–2020 a compression along a descending trendline ended with a March 2020 crash fakeout ahead of the 2020–2021 altseason. The current pattern, visible since 2023, shows base building, a trendline advance through 2024 and a recent fakeout near the upper boundary. Analyst Benjamin Cowen has noted comparable cyclical signals. The analyst el_crypto_prof wrote on social media: “It would be absolutely crazy if Altcoins were to repeat the story of 2016/2017 and 2020/2021, wouldn’t it? It’s starting to look more and more likely, though. We’ve got every reason to be excited, guys.”

The chart shows an accumulation base and trendline breakouts in the earlier cases; those setups preceded sustained rallies in the prior periods.

Real-time market data shows Bitcoin dominance closed at 60.88% on the daily chart after breaking out of an eight-month accumulation range that held between 58% and 60% from August 2025 through April 2026. The prior cycle high at 66.06% is the next nearby resistance. Momentum indicators on the daily chart show the Relative Strength Index rejected from bullish territory and rolling over, while the Moving Average Convergence Divergence printed a bearish cross. Traders reference 59.63% as the long-term 0.236 Fibonacci support and 55.66% as the 0.382 Fibonacci level; some analysts say a drop below 59.63% would create clearer room for altcoin outperformance.

The Altcoin Season Index currently reads 35. The index measures how many of the top 50 cryptocurrencies, excluding stablecoins and asset-backed tokens, have outperformed Bitcoin over the trailing 90 days. Readings of 75 or higher are commonly used to mark an altseason, while 25 or lower indicate a Bitcoin season. The present value is below the altseason threshold.

Bitcoin’s share of total crypto market capitalization stood near 60.3% as of May 2026, driven in part by continued institutional inflows into Bitcoin. Analysts have identified specific conditions that would align the current altcoin market-cap pattern with a broad altseason: Bitcoin dominance falling below 59.63% and the Altcoin Season Index rising above 50. They say if Bitcoin dominance extends toward 66% while the index remains below 50, the identified pattern would be unlikely to produce a widespread altseason.

Market participants are watching the altcoin market-cap chart, Bitcoin dominance and the Altcoin Season Index to track whether capital rotates from Bitcoin into other tokens.