The Altcoin market capitalization excluding Bitcoin and Ethereum (TOTAL3) has declined by 3.93% against Ethereum (ETH) this week, continuing a significant downtrend since early 2025. Investors holding altcoins should be aware of their underperformance relative to ETH, suggesting a potential shift in capital towards Ethereum or a broader market correction for smaller cryptocurrencies. This trend highlights the importance of monitoring altcoin performance against major assets like ETH to assess true portfolio health.