According to Cas Abbé, Bitcoin exchange supply has decreased to just 2.5 million BTC, marking the lowest level since Q3 2018. This represents a reduction of 500,000 BTC since Q4 2024. Recent disclosures from Fidelity indicate that institutional investors are actively purchasing and withdrawing Bitcoin from exchanges, intensifying the existing supply squeeze. For traders, the declining exchange supply combined with increasing institutional demand creates a bullish environment for BTC price action (Source: Cas Abbé on Twitter, April 27, 2025; Fidelity Institutional Reports).