Spot Bitcoin ETFs recorded $532 million in net inflows on May 4, the third straight day of positive flows. BlackRock's IBIT alone pulled in $335 million; Fidelity's FBTC took $185 million. Everyone else split the remaining $12 million.
Spot Bitcoin ETFs pulled in $532.21 million on May 4, according to SoSoValue — the third consecutive day of net inflows and the strongest single session since the late-April rebound. Bitcoin reclaimed $80,000 the same day. The headline is the recovery; the more interesting number is the concentration.
BlackRock's IBIT took $335.49 million on its own. Fidelity's FBTC took $184.57 million. That is $520 million between two products. The remaining nine spot Bitcoin ETFs in the US complex split a combined $12 million. Ark, Bitwise, Grayscale's mini-fund, VanEck, Valkyrie, Franklin Templeton, Invesco, WisdomTree, and Hashdex collectively contributed less than what a single mid-tier hedge fund moves on a quiet Tuesday.
The concentration is not new but it is widening. Through April, IBIT and FBTC accounted for roughly 80 per cent of cumulative spot Bitcoin ETF inflows since launch. May 4 took that share to 98 per cent for the day. Issuers were warned about this dynamic from the moment the SEC approved the original eleven applications in January 2024 — there were always going to be three or four winners and a long tail of products quietly bleeding management fees. What's new is the speed of the gap widening.
Fidelity is the more interesting story. FBTC charges 25 basis points, the same as IBIT, and has been adding to its allocation in the wirehouse channel that BlackRock has dominated for two decades. Fidelity's distribution into 401(k) and retail-advisor platforms is the structural reason FBTC has held second place against ETF complexes from larger institutional players. The product has now pulled in $11.27 billion in cumulative inflows, behind IBIT but ahead of every other competitor by a wide margin.
BlackRock's lead is harder to challenge. IBIT's total assets under management cleared $80 billion earlier this year, its options market overtook Deribit in average daily volume, and its in-kind creation mechanism — approved by the SEC in late 2024 — gave authorised participants a tighter arbitrage spread than any other product on the market. When BlackRock built a financial product, it built the financial product.
The day-four context matters. The Federal Reserve held rates steady at the most divided FOMC vote since 1992 on April 29, with four governors dissenting in favour of cuts. Bitcoin pushed through $75,000 within an hour of the announcement and has been climbing since. May 4's $532 million inflow was not driven by retail FOMO — it was institutional rebalancing into a market that had spent two months below trend.
The flows also came against a noisy geopolitical backdrop. The same trading session saw a missile report near the Iranian port of Jask knock Bitcoin briefly back to $79,000 before the price recovered into Tuesday morning. ETF flow data lags the spot market by a day, so the $532 million captures the institutional bid into that volatility. Whoever was buying did not blink at a regional military incident.
Ether ETFs added $61.3 million on the same day, with Solana and XRP products splitting smaller contributions. The combined crypto ETF inflow was roughly $600 million. Bitcoin's share of that — over 88 per cent — is unchanged from the structural pattern of the last six months. The narrative that ether ETFs would close the gap after the SEC's tokenised-securities innovation exemption was floated has not played out in flow data. Investors still buy Bitcoin first.
For BlackRock and Fidelity, the position is enviable but not immune to risk. The biggest threat to their joint dominance is not a competing ETF — it is direct corporate Bitcoin holdings. Strategy bought another 3,273 coins last week at $77,906, putting Saylor's stack at 818,334 BTC. Bitmine's ether treasury is now at 5.18 million ETH. Treasuries are eating the structural pool of bitcoin allocators that would otherwise route through ETFs, and the pension funds that prefer the regulated wrapper have already made their picks.
The next test is whether the third consecutive day of inflows turns into a fourth. Coinbase reports Q1 earnings on Thursday, which will give the market its first read on how badly the trading-line collapse has hit the listed exchange complex. If retail volume confirms the lull and ETFs keep absorbing the institutional bid, the flows tell a clearer story: this rally is being bought by allocators, not traders. The ETF complex is the only window into where that money is going. On May 4, almost all of it went to two issuers.
