According to an analysis from Ember Monitoring, a substantial net outflow of approximately 824 BTC is expected from Bitcoin spot ETF custody addresses following the opening of the U.S. stock market on April 15.

Reportedly, on-chain analytics point to a net outflow of $83.45 million from BTC spot ETFs in five days this week, aligning with the retracement of Bitcoin's price from $72,000 to $67,000 presenting a correction rate of 7%.

On April 12 alone, eleven BTC spot ETFs saw a net outflow of $55.06 million, underscoring the expected movement of 824 BTC from the ETF custody address post the U.S. stock market opening on April 15.

Specifically, Grayscale (GBTC) experienced an outflow of approximately 2,486 BTC, equating to an outflow of $166.21 million on April 12. In contrast, BlackRock's Bitcoin ETF (IBIT) posted an inflow of circa 1,662 BTC, translating to an inflow of $111.15 million on the same day.

Currently, the combined holdings of the eleven BTC spot ETFs amount to 841,806 BTC, valued at around $56.29 billion. The expected outflow could influence market dynamics and is a development to closely watch.