BlackRock’s iShares Bitcoin Trust, the largest spot Bitcoin ETF on the planet, saw investors pull $213.63 million on June 5. That translates to roughly 3,580 BTC walking out the door in a single session.

And IBIT wasn’t alone. Total net outflows across all US spot Bitcoin ETFs hit $325.66 million on the same day.

The full picture is bigger than one bad day

June 5 wasn’t an isolated event. It was the punctuation mark on a 13-day stretch of redemptions that drained approximately $4.4 billion from US spot Bitcoin ETFs.

IBIT absorbed the lion’s share of the pain, but the bleeding was widespread. Grayscale’s GBTC saw $60.84 million in withdrawals on the same day. Fidelity’s FBTC wasn’t far behind at $59.69 million.

IBIT’s dominance remains intact, for now

Despite the outflows, some perspective is warranted. IBIT launched in January 2024 and rapidly became the most successful ETF debut in history. It still holds the top spot among Bitcoin ETFs by assets under management, and it charges a management fee of 0.25%, which remains competitive in the category.

The 13-day, $4.4 billion redemption window is more concerning than any single day’s numbers. That duration suggests this isn’t just routine rebalancing. It reflects a deliberate reduction in Bitcoin exposure by the institutional class that drove much of the demand for these products in the first place.

What this means for investors

The immediate risk is straightforward: sustained selling pressure from major ETFs can weigh on Bitcoin’s spot price. When a fund like IBIT sells 3,580 BTC in a day, those coins hit the market.

The sensitivity of Bitcoin’s spot market to ETF flows has become one of the defining features of this cycle. Before January 2024, there were no US spot Bitcoin ETFs. Now they collectively represent a massive source of both demand and, as we’re seeing, supply pressure.