A Bitcoin whale with $11.4B in BTC has rotated into Ethereum, now holding $3.8B in ETH after selling 4,000 BTC ($435M) for 96,859 ETH in 12 hours. This mirrors a trend: nine whales bought $456M ETH in late August. Analysts attribute it to market maturity and US regulations like the GENIUS Act. ETH reached $4,946 ATH, now at $4,389. Experts foresee flows to altcoins like Solana, indicating a diversifying crypto ecosystem.