The Bitwise Bitcoin ETF (BITB) showed a 162.78 BTC reduction on Wednesday, September 16, 2026, translating to a $12.36 million outflow. This move comes after a volatile period where the fund clawed back from its largest-magnitude withdrawal, a 280.70 million dollar pull, to a subsequent $237.90 million inflow that remains its biggest positive move in the series. Holdings data is sourced from Bitwise Bitcoin ETF holdings and the iShares Bitcoin Trust holdings file. The full dataset is available via the Crypto ETF Flows page and its API.
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Largest Positive Flow in this stored window
The single biggest positive movement for BITB in this stored series is an inflow of $237.90 million. By absolute magnitude, and regardless of direction, the fund's largest-magnitude print was an outflow of $280.70 million. Over the entirety of the stored timeline, the cumulative sum of all BITB flows totals $2.55 billion.
Three Regimes for Bitwise's ETF
The trajectory of BITB over this window shows three clear phases. There was an initial accumulation, where holdings built to a peak of 38,354.79 BTC on Monday, September 9, 2026. That was followed by a severe washout, punctuated by its biggest single-day withdrawal. The current, tentative recovery phase is defined by the large positive flows that have come after that washout. The complete record of every stored session for BITB is below, showing holdings, computed flow, and assets under management (AUM). A blank flow marks a first snapshot, and a $0.00 flow is a stored zero, not a missing day.
| Date | Weekday | Holdings | Computed Flow | AUM |
|---|---|---|---|---|
| 2026-09-09 | Wednesday | 38,354.79 BTC | $0.00 | $2.99 billion |
| 2026-09-10 | Thursday | 38,354.79 BTC | -$12.60 million | $2.96 billion |
| 2026-09-11 | Friday | 38,192.00 BTC | $0.00 | $2.94 billion |
| 2026-09-14 | Monday | 38,192.00 BTC | $0.00 | $3.00 billion |
| 2026-09-15 | Tuesday | 38,192.00 BTC | $0.00 | $2.88 billion |
| 2026-09-16 | Wednesday | 38,029.22 BTC | -$12.36 million | $2.89 billion |
Table: Partial BITB holdings and flow, every stored session (Chronological). Zero flow is a stored zero, not a missing row. The event date is highlighted.
Bitwise's Ether ETF Streak Ends
While its Bitcoin fund swung wildly, Bitwise's Ethereum ETF (ETHW) told a story of stagnation followed by sudden change. The fund logged exactly $0.00 in net computed flow for 15 consecutive stored sessions, a long stretch of apparent inaction. That streak of zero flows ended abruptly on Wednesday, September 16, with an outflow of $34.39 million. Just before that, on Monday, September 14, the fund had taken in $29.10 million. Together, these two moves erased the long period of zero net activity.
First Snapshots From iShares
Major context for the ETF flow story lies in the scale of two funds that haven't started moving in this data yet. BlackRock's iShares Bitcoin Trust (IBIT) and iShares Ethereum Trust (ETHA) currently have their first holdings snapshot dated Monday, August 17, 2026, meaning no prior row exists for generating a daily computed flow.
Their foundational scale is immense. IBIT holds 786,654.34 BTC, which is 20.7 times the Bitcoin held by BITB as of Wednesday. ETHA holds 3,614,457.33 ETH, a figure 33.1 times larger than ETHW's holdings. Combined, the two Bitcoin funds (BITB and IBIT) control 824,683.56 BTC. The two Ethereum funds (ETHW and ETHA) together hold 3,723,650.68 ETH.
The latest snapshot for each of the four covered funds is summarized below. The absence of a flow figure for ARKB indicates it's also a first snapshot.
| Ticker | Issuer | As-of date | Holdings | Computed Flow | AUM |
|---|---|---|---|---|---|
| ARKB | ARK 21Shares | 2026-09-15 | 32,095.00 BTC | first snapshot, no flow | $2.44 billion |
| BITB | Bitwise | 2026-09-16 | 38,029.22 BTC | -$12.36 million | $2.89 billion |
| ETHA | iShares (BlackRock) | 2026-09-14 | 3,614,457.33 ETH | $80.50 million | $8.69 billion |
| ETHW | Bitwise | 2026-09-16 | 109,193.35 ETH | -$34.39 million | $262.60 million |
| IBIT | iShares (BlackRock) | 2026-09-14 | 786,654.34 BTC | $134.30 million | $59.73 billion |
Table: Latest holdings by ticker (Four tickers only. A blank flow is a first snapshot, not a zero print.)
How Computed Flows Are Made
This analysis uses a computed flow figure derived from public disclosures. For Bitwise's BITB and ETHW, holdings come from the embedded basket data on their fund pages. For iShares' IBIT and ETHA, holdings are taken from the Quantity column in their latest-holdings.csv file. Each row is stamped with the issuer's as-of date.
The computed flow shown is the change in the number of coins held versus the prior stored row for that same ticker. That coin delta is then multiplied by the XOOMAR Bitcoin or Ethereum price at the moment of data ingest to produce a dollar figure. For instance, BITB's Wednesday coin change was -162.78 BTC, which resulted in the -$12.36 million computed flow. A missing flow value in a table means that row is the first snapshot for that ticker in the stored data.
Perpetual Marks at Tape Time
For context on the dollar values used for AUM and flow, here are concurrent Bitcoin and Ethereum perpetual futures marks and funding rates, captured from a separate Funding Rates dataset. They are presented alongside the ETF data for situational awareness only. No causal relationship is implied.
| Asset | Exchange | Mark | Funding Rate | Open Interest Notional |
|---|---|---|---|---|
| BTC | hyperliquid | $75,859.00 | 0.00001250 | $2.74 billion |
| BTC | binance | $75,855.12 | 0.00005725 | not available |
| BTC | okx | $75,844.50 | 0.00006070 | $2.12 billion |
| BTC | bybit | $75,853.10 | 0.00005504 | $4.32 billion |
| BTC | kraken | $75,840.26 | 0.00002739 | $155.96 million |
| BTC | bitmex | $75,838.13 | 0.00010000 | $9.69 million |
| ETH | hyperliquid | $2,402.00 | 0.00001048 | $2.29 billion |
| ETH | bybit | $2,401.74 | -0.00005735 | $1.86 billion |
| ETH | okx | $2,401.81 | 0.00003155 | $1.50 billion |
| ETH | binance | $2,401.81 | 0.00000358 | not available |
| ETH | bitmex | $2,401.20 | 0.00010000 | $1.91 million |
| ETH | kraken | $2,401.69 | 0.00002905 | $75.73 million |
Table: Same-time perpetual marks. Not caused by the ETF print.
Waiting for a Second IBIT File
The story is incomplete. The massive iShares Bitcoin and Ethereum funds, IBIT and ETHA, exist in this dataset so far only as inaugural snapshots. Until a second holdings file is published and ingested, providing a prior row for comparison, their daily computed flows will remain empty. That second data point will unlock the daily flow scale of those market behemoths, which could easily overshadow the swings seen in the smaller Bitwise funds. For now, the tape shows BITB's mixed recovery from its depths and ETHW's broken streak, set against the silent, massive holdings of the new leaders.
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Disclaimer: Content on XOOMAR is produced using AI-assisted research, drafting, and verification workflows and is intended for informational and educational purposes only. It does not constitute financial, investment, legal, tax, medical, or professional advice of any kind. All analysis reflects available information at the time of publication and may not be current. Verify information independently and consult qualified professionals before making decisions. Editorial policy
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XOOMAR is a capital markets software and data company in Selden, New York. Every brief on this site starts from a dataset the company collects itself from primary sources (CFTC, SEC EDGAR, FINRA, the Federal Reserve, exchange APIs) and names the numbers it is built on, with a link to the data page so you can check them. Briefs are reviewed before they go out and corrected in place when the data is revised.
