Bitcoin ETFs Log 4 Consecutive Days of Net Inflows — BlackRock IBIT Alone Absorbs $64.35B

Institutional capital is flowing back into Bitcoin ETFs following the March rebound. With BlackRock IBIT driving overall market momentum, a Coinbase-centered custody infrastructure is firmly establishing the structural backbone for institutional adoption.

According to SoSoValue data compiled on the 18th, U.S. spot Bitcoin ETFs recorded a net inflow of $26.05 million on April 16, extending a positive streak for the third consecutive trading day. BlackRock IBIT alone absorbed $81.71 million on that day, bringing its cumulative net inflows to $64.35 billion. On April 15, IBIT captured $291.86 million out of the market-wide net inflow of $186.03 million.

The trend is equally pronounced on a weekly basis. The week ending April 10 saw net inflows of $786.31 million — the highest since the start of the year. As of April 16, weekly net inflows stood at $332.46 million, with total market net assets reaching $97.9 billion.

BlackRock IBIT: The Dominant Force Commanding Half the Market

IBIT sits at the center of the recovery. As of late March, IBIT held approximately $54 billion in assets under management (AUM), capturing 49% of the U.S. spot Bitcoin ETF market. Its lead over second-place Fidelity FBTC (approximately $18 billion) is nearly threefold.

Capital flowing into IBIT translates directly into spot market demand. When investors purchase IBIT shares, authorized participants (APs) acquire actual Bitcoin on spot exchanges to back those shares — meaning large-scale net inflows create immediate buying pressure in the underlying market.

This mechanism kicked back into high gear in April. On April 13, news of Goldman Sachs filing for a new Bitcoin ETF triggered a single-day net inflow of $411.5 million, with not a single fund recording a net outflow that day. IBIT drew in $214 million, ARK 21Shares attracted $113 million, and Fidelity pulled in $45 million.

Coinbase: The Linchpin of ETF Market Infrastructure

As the ETF market has grown, the contours of custody infrastructure have come into sharp relief. As of April 8, total AUM across U.S. Bitcoin ETFs stood at $91.71 billion, of which funds designating Coinbase as custodian held approximately $77.1 billion — representing 84.1% of the entire market.

BlackRock IBIT ($55.7 billion), the Grayscale ETF suite ($14.67 billion), Bitwise BITB ($2.67 billion), and ARK ARKB ($2.59 billion) are all built on Coinbase's custody framework.

Coinbase's standing is also being reinforced on the regulatory front. The conditional approval from the Office of the Comptroller of the Currency (OCC) announced on April 2, along with its New York trust charter status, are seen as factors cementing Coinbase's position as an institutional-grade custodian. This is widely interpreted as establishing the regulatory foundation necessary to channel institutional capital — which demands a federal-level compliance framework — into the crypto market.

Greg Tusar, Coinbase's Vice President of Institutional Products, has stated that the company already serves as custodian for more than 80% of global crypto ETFs.

Institutional Accumulation Persists Despite Fear-Driven Sentiment

Prices remain in a correction phase, yet the directional conviction of institutional money is unambiguous. As of the morning of April 17, Bitcoin on Binance was trading at $74,729 (+0.13%), with a weekly range of $74,290–$75,412. Even as the Fear & Greed Index has held in 'Extreme Fear' territory at 21 for more than 60 consecutive days, BlackRock IBIT absorbed $505.77 million over just two days — April 14 and 15 — signaling accelerating accumulation.

While retail sentiment gauges signal deep pessimism, institutional capital is treating the correction as a buying opportunity. The prevailing market view holds that for Bitcoin to retest its 2025 October highs, three conditions must align: sustained weekly ETF inflows of $1 billion or more, an easing of geopolitical risk, and a pivot in Fed monetary policy.