Solana (SOL) led the market with $118 million in institutional inflows last week, according to a CoinShares report, as the altcoin season index reached 100. This surge comes amid a broader market rebound, with XRP also attracting $28.2 million in inflows. In contrast, Bitcoin and Ethereum experienced outflows during the same period. The recent launch of the U.S. Spot SOL ETF and potential XRP ETFs are seen as key drivers of this trend. Despite the inflows, many altcoins have not fully recovered from October's losses, and some traders are taking profits during the rally, as indicated by CryptoQuant data.