The first half of 2026 has been the biggest fundraising stretch in the short but explosive history of US spot Bitcoin ETFs. Cumulative net inflows since the vehicles launched in January 2024 now surpassing $58 billion.

The numbers behind the record run

On January 2 alone, US crypto ETFs attracted nearly $670 million in fresh capital. Bitcoin-specific products accounted for $471 million of that haul, with BlackRock’s iShares Bitcoin Trust (IBIT) pulling in approximately $287 million to lead all issuers.

January also delivered one of the most remarkable single-day performances in ETF history. Inflows hit $843.6 million in a single session, the highest figure since October 2025. That day anchored a three-day streak that totaled $1.71 billion.

April turned out to be the real standout month. Bitcoin ETFs posted their strongest monthly inflows of 2026, landing somewhere between $1.97 billion and $2.44 billion — again, the best performance since October 2025.

The usual suspects led the charge. BlackRock’s IBIT continued to dominate in terms of raw inflows. Fidelity’s FBTC and Bitwise’s BITB also captured meaningful market share. Grayscale’s GBTC, the converted trust that has functioned as a slow-motion outflow machine since the ETF conversion, continued to see capital leave, though at a less dramatic pace than in 2024.

The May speed bump

From mid-May to early June, Bitcoin ETFs suffered their longest outflow streak of the year. Over 13 consecutive trading days, roughly $4.4 billion exited these products. The streak finally broke on June 5, when flows turned positive again with a modest net inflow of $3.05 million.

A 13-day outflow streak that erased $4.4 billion represents a fraction of the $58 billion in cumulative inflows these products have absorbed since inception.

What this means for investors

ETF flows have become one of the most reliable demand signals in the Bitcoin market. Unlike on-chain metrics that require interpretation, or futures data that reflects leveraged speculation, ETF inflows represent actual dollars from actual institutions buying actual Bitcoin exposure through regulated channels.

BlackRock’s IBIT has established itself as the dominant product. Fidelity and Bitwise have carved out meaningful positions as alternatives. Grayscale continues to lose ground, a slow unwinding that began when GBTC converted from a closed-end trust to an ETF and investors finally got the chance to exit positions they’d been locked into for years.

As May demonstrated, these products are not immune to drawdowns. A $4.4 billion outflow streak over 13 days can create meaningful selling pressure on Bitcoin’s spot price, since ETF issuers must buy and sell actual Bitcoin to match fund flows.