Altcoin strength flipped five times in a week, revealing unstable rotations and a clear shift toward Bitcoin-led positioning.
From May 25 to June 26, 50+ altcoins briefly outperformed before collapsing, signaling fading momentum and rapid capital shifts.
Tokens like PEPE and GALA surged 20%+ in hours, but gains vanished fast, reinforcing exhaustion and Bitcoin’s volatility anchor role.
Between May 25 and June 26, the Altcoin Season Index experienced severe market volatility, indicating fast attitude shifts across Bitcoin and over 50 altcoins. Volatility surged over several phases, causing traders to cycle money at a considerably higher rate. This chart-driven pattern is prompting renewed debate around when true altcoin season may return.
Bitcoin’s Dominance Returns as Altcoin Index Crashes
“Who's ready for an Altcoin Season?” asked analyst Joao Wedson in a post referencing the latest Alphafractal chart tracking altcoin strength relative to Bitcoin. The chart measures how many altcoins outperform BTC over a 60-day rolling window. As of late June, the index remains well below 25%, reinforcing Bitcoin’s hold on market dominance.
From April through June 2024, the index sustained levels above 75%, indicating a sustained altcoin outperformance phase. However, this momentum reversed sharply by August, and again in May 2025, when the blue line collapsed toward 10% while Bitcoin held firm around $70K. Traders interpreted this as a capital flow reset into BTC-led safety plays.
This consistent drop suggests investors are favoring Bitcoin amid sector-wide pullbacks. As observed in the index, fewer than 10 altcoins managed to outperform BTC in recent sessions. Such a strong retracement reflects both diminished risk appetite and a more selective trading environment.
Hourly Chart Shows Unrelenting Rotations and Instability
According to a report by Alphafractal, the 48-hour rolling window between May 25 and June 26 revealed one of the most aggressive intra-month rotations this year. On May 26, over 50 out of 56 tracked altcoins outpaced Bitcoin within 48 hours. The index surged above 90% briefly, marking a short-lived altcoin-led breakout.
However, this dominance collapsed to under 25% by May 31, as BTC stabilized near $10,600. Traders appeared to switch back into Bitcoin during periods of altcoin exhaustion. By June 2, five distinct flips between altcoin and Bitcoin dominance unfolded in less than a week, underscoring how speculative behavior dominated all sessions.
These rapid oscillations in sector leadership painted a chaotic picture. With Bitcoin acting as a volatility anchor, altcoins captured short-lived bursts of capital, only to lose strength within hours. It became a cycle of chasing momentum, one that tested even seasoned intraday traders.
Performance Heatmap Reveals High-Beta Chasing and Exhaustion
A third chart highlights clustered hourly price performance across major altcoins and Bitcoin. From May 25 to June 30, tokens such as PEPE, DOGE, and RENDER repeatedly posted +20% surges during Bitcoin’s low-volatility phases. Yet, few managed to maintain gains past the 48-hour window.
The heatmap shows that Bitcoin remained within a ±5% range throughout most sessions, clearly acting as a baseline. Meanwhile, altcoins moved rapidly in and out of trend, driven by bursts of speculative inflows. This created a short-term narrative around high-beta chasing, followed by collective exhaustion.
Notably, June 24 recorded another sharp spike as tokens like ALT, RNDR, and GALA jumped above +20%. But by June 26, all major assets-including high-flyers-had-had clustered back into a ±10% band, confirming a return to market neutrality. This compression phase signals waning momentum across the board and highlights a key transition zone for risk-sensitive traders.
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