BlackRock Bitcoin ETF Powers Into Top 5 ETFs With Largest YTD Inflows

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BlackRock Bitcoin ETF (IBIT) exploded into the top five U.S. ETFs by year-to-date (YTD) inflows as of May 21, 2025. On that day, Bloomberg-tracked data quoted by MilkRoad showed IBIT had attracted roughly $9.0 billion in net inflows for 2025, vaulting it past major fund categories. This was a dramatic leap: IBIT had ranked only #47 among U.S. ETFs a month earlier. For context, as of May 7, IBIT’s YTD inflows were about $6.96 billion – already the 6th-largest of all ETFs. That pace outstripped the SPDR Gold Trust (GLD), which had $6.5 billion and was #7 on May 7. By mid-May, IBIT’s position had climbed further: Bloomberg data put GLD only at #14 on the YTD flows list, with IBIT at #5. BlackRock Bitcoin ETF Massive Inflows in Mid-May The inflows were driven by an unprecedented inflow of new capital in late May. U.S.-listed spot Bitcoin ETFs drew about $934.8 million on May 22 alone. As reported by The Coin Republic, BlackRock Bitcoin ETF IBIT accounted for $877.2 million of that one-day total, roughly 94% of all BTC ETF inflows that day. In effect, IBIT was the single biggest net inflow ETF in the U.S. Over the three trading days from May 21–23, IBIT added roughly $1.4 billion more in inflows. This single-week pull was part of a larger monthly trend: Bloomberg data indicate BlackRock Bitcoin ETF took in on the order of $7–8 billion in about one month. By comparison, most traditional funds saw modest flows. SPDR Gold Shares (GLD) – the largest gold ETF – had slipped to just #14 by YTD inflows. Other big equity or bond ETFs did not come close to IBIT’s surge. In fact, on May 22, BlackRock Bitcoin ETF outpaced Vanguard’s giant S&P 500 ETF (VOO). Source: Balchunas X Balchunas reported that IBIT took in $877.18 million vs.…