BTC Spot ETF Capital Segregation: Analysis of Flow Structure Changes in IBIT, ARKB, and FBTC

In mid-May 2026, the US spot Bitcoin ETF market saw a striking shift in capital flows. After sustaining net inflows for six consecutive weeks, these products recorded net outflows of more than $1 billion during the week ending May 16. Of this, on May 13 alone, outflows were about $635 million— the largest daily withdrawal since January 29— and on May 18 there was again net outflow of about $649 million.

What’s even more notable is that this round of outflows was not “evenly distributed.” The divergence in capital among different fund products was extremely pronounced—among the three leading products, BlackRock’s IBIT, Ark Invest’s ARKB, and Fidelity’s FBTC, the three funds exhibited distinctly different rhythms and magnitudes of flows. Behind this divergence is a deeper strategic adjustment by institutional investors, as well as a re-pricing of the logic used to allocate crypto assets in response to a sudden macro environment shift.



## Continuous Net Inflows Come to an Abrupt Halt

From March to April 2026, US spot Bitcoin ETFs together attracted approximately $3.29 billion in net inflows, which was seen as a key force pushing Bitcoin back above the $80,000 level. In April and early May, daily net inflow peaks at one point exceeded $600 million, and the market maintained a positive net flow for multiple weeks. According to Gate’s market data, on May 6 Bitcoin briefly touched about $82,828 during the day trading session, reaching a stage high since February.

This trend reversed in mid-May.

On May 12, Bitcoin ETFs recorded net outflows of about $233 million. On May 13, the outflow amount surged to about $635 million— the largest single-day redemption since January 29, 2026. On May 15, multiple spot Bitcoin ETFs basically recorded net outflows or zero net inflows. On May 18, outflows continued to accelerate to about $649 million.

As of May 19, the cumulative net inflow into Bitcoin spot ETFs since their launch had slipped from the previous week’s peak of about $59.76 billion to $57.691 billion. According to Gate’s market data, Bitcoin is currently quoted at about $76,827.8, down about 0.28% over the past 24 hours, and down about 22.08% over the past year. Market sentiment is in a neutral range.

## A Full Picture of Capital Divergence Among IBIT, ARKB, and FBTC

The most core feature of this ETF capital outflow cycle is the divergence in flows among leading products. The three Bitcoin ETFs that dominate the market—IBIT, ARKB, and FBTC—played entirely different roles in this outflow cycle.

Summary of Core Data

The table below, compiled based on publicly tracked data from SoSoValue and Farside, presents fund-level data at two key outflow points: May 13 and May 18.

| Fund Name | Net Outflow on May 13 (USD) | Net Outflow on May 18 (USD) |
| --- | --- | --- |
| BlackRock IBIT | approx. $285 million | approx. $448 million |
| Ark ARKB | approx. $177 million | approx. $110 million |
| Fidelity FBTC | approx. $133 million | approx. $63.42 million |
| Bitwise BITB | — | approx. $9.16 million |
| Franklin EZBC | — | approx. $6.65 million |
| VanEck HODL | — | approx. $7.59 million |

Looking at the full trading week from May 11 to May 15, ARKB led all products with outflows of about $324 million, followed by IBIT with net outflows of about $317 million, and FBTC with losses of about $259 million. These three funds together contributed the vast majority of the total outflows of the Bitcoin ETFs for that week.

IBIT: From an Inflow Engine to a Leading Outflow Force

IBIT’s shift is especially eye-catching. As the spot Bitcoin ETF with the largest assets in the market, IBIT has long been the preferred channel for institutional investors to allocate to Bitcoin. However, during this outflow cycle, IBIT’s outflow scale expanded day by day—from about $285 million on May 13 to about $448 million on May 18—suggesting that some IBIT holders’ de-risking decisions may be persistent rather than a one-time move.

ARKB and FBTC: Markedly Different Outflow Cadence

Unlike IBIT’s acceleration in outflows, ARKB’s outflow pattern showed a “higher weekly pace and lower daily pace.” Based on weekly data, ARKB saw total outflows of about $324 million from May 11 to May 15—the highest among all Bitcoin ETFs. But based on the single-day data on May 18, ARKB’s outflow had fallen to about $110 million. This may indicate that ARKB’s main redemption phase was concentrated in the early part of the week (from early week to midweek), and subsequent selling pressure eased.

FBTC’s capital outflow cadence was comparatively steady. Outflows were about $133 million on May 13, and narrowed further to about $63.42 million on May 18. As a product under asset management giant Fidelity, FBTC demonstrated slightly better capital resilience amid this market turbulence than IBIT and ARKB.

## Breakdown of Public Sentiment and Viewpoints: What Is the Market Debating?

Around this round of ETF capital outflows, the market has formed several core points of contention.

Viewpoint 1: Profit-Taking, Not a Trend Reversal

Some analysts characterize this cycle of outflows as technical profit-taking. Since the April lows, Bitcoin has rebounded significantly, accumulating substantial unrealized gains. When the price met resistance around $82,000 and failed to break through, profit-taking likely led to a wave of ETF redemptions. A CryptoQuant analyst noted that this level historically served as a key resistance-turned-support during bear markets. Strong net inflows in April and early May indicated that the institutional demand base remained intact; this outflow, more likely, was driven by short-term risk aversion or profit realization.

Viewpoint 2: Macro-Driven Structural Adjustment

A more cautious view holds that this round of outflows is not only technical, but also driven by fundamental changes in the macro environment. In the United States, the April CPI year-over-year growth rate announced in May reached 3.8%, the highest since May 2023; PPI data rose to 6%, marking the fastest inflation pace since 2022. Expectations for rate cuts cooled sharply as a result.

At the same time, the Federal Reserve is in a historic leadership transition. On May 13, the US Senate confirmed Kevin Woorh to succeed Powell as the new chair of the Federal Reserve in a 54-to-45 vote. Woorh is known for a hawkish stance; his emphasis on monetary discipline and preference for balance-sheet reduction have made the market more cautious about the outlook for risk assets such as Bitcoin. According to official Federal Reserve data, the current effective federal funds rate remains in the range of approximately 3.63% to 3.64%. Polymarket’s market-implied prediction shows the probability price for zero rate cuts for the full year is 62%.

Viewpoint 3: Institutional Rebalancing Rather Than Deleveraging—Internal Rotation in Crypto

Another perspective worth attention is that the capital flowing out of Bitcoin ETFs may not have fully exited the crypto market, but instead has been reallocated within crypto assets. Data shows that in the same week when Bitcoin and Ethereum ETFs saw large redemptions, XRP spot ETFs recorded net inflows of approximately $60.5 million, and Solana ETFs recorded net inflows of approximately $58.12 million. XRP’s appeal was boosted by the positive impact of the CLARITY Act passing in the Senate Banking Committee, while Solana’s demand was tied to expectations for its Alpenglow network upgrade.

This phenomenon suggests that institutional investors are shifting from “a single bet on Bitcoin” to “selective allocation based on specific catalysts,” and that capital rotation rather than a systematic exit may be a more accurate description.

## Institutional Holdings Changes Verified: 13F Filings Reveal Intensifying Divergence

The continued disclosure of 13F holdings files in Q1 2026 provides longer-term evidence of institutional behavior underlying this round of capital divergence.

Jane Street, a major Wall Street proprietary trading firm, sharply cut its Bitcoin ETF exposure in Q1 2026: IBIT holdings fell about 71% quarter-over-quarter to approximately 5.9 million shares (market value about $225 million), while FBTC holdings declined about 60% to about 2 million shares. However, the firm did not fully exit the crypto market; in the same period, it significantly increased its holdings of Ethereum ETFs. Bitwise analyst Jeff Park noted that Jane Street’s reductions may be more related to closing out basis trades rather than a directional bearish view on Bitcoin.

Goldman Sachs’ holdings adjustments are also worth noting. According to its Q1 2026 13F file, the firm reduced its Bitcoin ETF holdings by about 10% to approximately $7.15 billion, and fully liquidated all of its approximately $154 million positions in XRP and Solana ETFs. Instead, its funds shifted toward crypto infrastructure stocks—Circle holdings increased 249%, and Galaxy Digital holdings increased 205%.

Meanwhile, JPMorgan took a sharply opposite approach. In Q1, its IBIT holdings increased from about 3 million shares to about 8.3 million shares, a rise of about 174%; FBTC increased by about 450%, and it also established a Solana ETF position for the first time. This divergence in holdings directions among different institutions within the same quarter further confirms that the current market is not simply “institutions selling”—institutions are instead conducting a deep rebalancing of asset allocations.

## Industry Impact Analysis: The Deeper Meaning of Capital Divergence

The Bitcoin ETF outflows and the internal product divergence in this cycle have multiple implications for the crypto industry.

First, ETF capital flows are becoming a core variable for short-term market pricing. With cumulative net inflows of about $57.691 billion, the scale of ETF flows is large enough to produce a notable impact on the spot market. Marginal changes in inflows and outflows directly affect market sentiment.

Second, the divergence of capital across different crypto asset ETFs indicates that a more mature institutional investor ecosystem is taking shape. Investors are no longer allocating broadly across crypto assets; instead, they are beginning to distinguish the narrative drivers and risk characteristics of different assets. Bitcoin, with its strong macro sensitivity as “digital gold,” faces greater pressure in a rising interest-rate environment; whereas assets such as XRP and Solana receive independent support due to regulatory tailwinds or expectations of technological upgrades.

Third, the statistical correlation between ETF capital flows and Bitcoin prices has clearly weakened recently. Based on a study of the Pearson correlation coefficient, the 90-day rolling correlation between Bitcoin’s daily return and changes in the ETF’s cumulative net inflows has dropped sharply from the February peak of 0.68 to about 0.16, approaching zero. This means that merely observing ETF capital inflows and outflows can no longer directly predict Bitcoin price movements. Bitcoin’s price discovery mechanism is becoming more diversified; on-chain data, derivatives markets, macro liquidity, and geopolitical factors are all playing roles.

## Conclusion

Bitcoin ETFs saw more than $1 billion in net outflows for the week in mid-May 2026, breaking the prior pattern of net inflows over six consecutive weeks and sparking widespread debate about whether institutional sentiment has fundamentally shifted. A close examination of the internal structure of this round of outflows shows that capital is not “systematically exiting” the crypto market: the sharply different outflow cadences among IBIT, ARKB, and FBTC, the counter-flow net inflows into XRP and Solana ETFs, and the large divergence in holdings among Wall Street institutions revealed in Q1 13F filings together depict a more complex picture. This is not simply reducing positions or rotating holdings—it is a deep reshaping of institutional investors’ crypto asset allocation logic.

When macro interest-rate conditions, the evolution of regulatory frameworks, and specific asset catalysts interact with each other, divergence in ETF capital flows will no longer be an abnormality, but instead become a structural characteristic of a maturing crypto market. For investors, understanding the causes and direction of this divergence will be more decision-relevant than simply focusing on total inflow or outflow figures.