BlackRock buys $1B of Bitcoin over past 20 days as Grayscale bleeds another $255M

BlackRock's iShares Bitcoin Trust (IBIT) has accumulated roughly $1.08 billion in net inflows over the past 20 days, according to on-chain data from Arkham Intelligence. During the same window, Grayscale's Bitcoin Trust (GBTC) shed approximately $254.7 million in outflows.

IBIT's 20-day haul was punctuated by some standout sessions. Daily inflows hit $454 million on September 3, the kind of single-day figure that most ETFs never see across their entire lifetimes. Another notable session on August 27 brought in $277.6 million as markets rebounded from a choppy August.

Those inflows have pushed IBIT's total holdings to approximately 785,000 BTC, with assets under management now exceeding $60 billion.

GBTC, meanwhile, sits at roughly 130,000 BTC with an AUM hovering near $10 billion.

The fee differential tells much of the story. IBIT charges 0.25% annually. GBTC charges 1.5%. On a $10 million position, that's the difference between paying $25,000 and $150,000 per year for essentially the same exposure to the same asset.

US spot Bitcoin ETFs collectively now hold over 1.28 million BTC, representing roughly 6% of Bitcoin's total supply. The broader ETF category pulled in over $3 billion during the recent surge, with IBIT capturing the lion's share. Bitcoin's price has oscillated between $60,000 and $80,000 during this period.