Bitcoin ETF 13F Filings: A Photograph, Not a Trend Line

On May 15, 2026, Harvard Management Company filed a Form 13F reporting 3,044,612 shares of the iShares Bitcoin Trust ETF. Its previous filing had reported 5,353,612 shares, plus 3,870,900 shares of the iShares Ethereum Trust worth $86,824,287. In one quarter the Bitcoin ETF share count fell 43% and the Ether position went to zero. Both positions were already at those levels on March 31 — six weeks before the filing that disclosed them existed. That lag is built into bitcoin ETF 13F filings, and it is the part most coverage of them skips.

Headlines quote one dollar figure and call it institutional conviction. What the filing contains is a line in an XML information table — issuer name, CUSIP, share count, dollar value, discretion code — frozen on the last day of a quarter that ended up to 45 days ago. This post walks two real filings line by line and gives you a repeatable way to check the next batch when it lands on August 14, 2026.

Why Bitcoin and Ether ETFs Show Up on a 13F at All

There is no crypto-specific filing here. Form 13F covers a defined universe called Section 13(f) securities, and the SEC’s Form 13F FAQ defines those as “equity securities of a class described in Section 13(d)(1) of the Securities Exchange Act.” The Official List, it explains, “primarily includes U.S. exchange-traded stocks (e.g., NYSE, AMEX, NASDAQ), shares of closed-end investment companies, and shares of exchange-traded funds (ETFs).” A spot Bitcoin ETF is caught by that last clause exactly the same way an S&P 500 index fund is.

The reason those funds only started appearing recently is that they only recently existed. The SEC approved the first spot bitcoin exchange-traded products on January 10, 2024. In his statement that day, then-Chair Gary Gensler was careful to note the action was “cabined to ETPs holding one non-security commodity, bitcoin,” and that “we did not approve or endorse bitcoin,” which he described as “primarily a speculative, volatile asset.” Ether followed on May 23, 2024, when the Commission issued Release No. 34-100224, an order granting accelerated approval of Rule 19b-4 proposals to list and trade eight ether-based ETPs, including the iShares Ethereum Trust that later showed up on Harvard’s books.

Once a fund lists, it enters the roster of reportable securities. The SEC’s Official List of Section 13(f) Securities is “made available to the public pursuant to Section 13(f)(4) of the Securities Exchange Act of 1934,” and “an updated list is published on a quarterly basis.” The list refreshes; the rules do not change.

The $100 Million Threshold, the 45-Day Clock, and Why August 14 Matters

The filing trigger is a dollar amount, not an asset class. Per the SEC, “institutional investment managers that use the United States mail (or other means or instrumentality of interstate commerce) in the course of their business and that exercise investment discretion over $100 million or more in Section 13(f) securities must file Form 13F.” Investor.gov notes those managers “can include investment advisers, banks, insurance companies, broker-dealers, pension funds, and corporations” — which is why an endowment and a Spanish bank end up in the same dataset. Each filing is due “within 45 days after the end of the calendar quarter.” If you want the broader mechanics, our guide to reading SEC Form 13F covers who files and how the tables are laid out.

Q2 2026 positions froze on June 30. Counting forward 45 days puts the deadline at August 14, 2026, which Finrep’s 2026 deadline breakdown confirms. That post also flags a mechanical trap worth knowing if you are refreshing EDGAR that evening: submissions after 5:30 p.m. ET get the next business day’s filing date, so “a 13F submitted at 6:00 p.m. on August 14 is technically filed on August 17, and is late.”

If you prefer structured data to individual filings, the SEC publishes Form 13F data sets presented “without change from the ‘as-filed’ submissions.” Since March 2024 those files run “following the end of the months: February, May, August, November” — so the full Q2 2026 set arrives after the August filing window closes, not during it.

Case Study: Banco Santander’s First-Ever Bitcoin and Ether ETF Position

Banco Santander filed its Q2 2026 Form 13F-HR on July 29, 2026 (accession 0000891478-26-000080). Buried among 929 line items in the information table are two rows that had never appeared in a Santander filing before. Here they are as the XML actually reports them.

Three things are worth noticing. There is no ticker column — the table identifies securities by CUSIP, so 46438F101is how you find the iShares Bitcoin Trust ETF (which trades as IBIT) in any filer’s table. The “value” field is market value at quarter-end, not what the manager paid. And the gold trust one row away is a reminder that a commodity ETF line is an ordinary holding, not a special disclosure.

Size matters. Santander’s entire reported table adds up to roughly $16.08 billion, putting the Bitcoin ETF position at about 0.027% of it — a figure TFTC’s writeup of the filing also puts at “approximately 0.027% of that portfolio.” It is a milestone (the bank’s first appearance on a Bitcoin ETF shareholder list) and a rounding error (portfolio weight) at once. Only one of those readings survives a headline.

Case Study: Harvard’s Bitcoin ETF 13F Filings Swung 43% in One Quarter

Santander shows what a position looks like. Harvard shows why one is not a trend. Put the endowment’s two most recent information tables side by side.

The Q1 2026 table contains 17 holdings and no spot Ether fund at all — CUSIP 46438R105 simply is not there. Cryptopolitan reported the cut as roughly 43% alongside the elimination of about $86.8 million of Ether exposure, and noted Harvard had already trimmed the Bitcoin position in the prior quarter, making Q1 an extension of a multi-quarter reduction rather than a one-off.

The Rear-View Mirror Problem: Why the 45-Day Lag Hits Crypto Harder

Every 13F has this problem. It freezes holdings on the last day of the quarter and becomes public up to 45 days later, by which point the manager has had six weeks to do something else. As crypto.news put it, “the filing is a photograph of a single past moment, presented to the public after a delay long enough for the scene to have changed completely.”

The same piece describes a large investment bank (unnamed in the article) whose 13F showed it as the largest disclosed institutional holder of a spot XRP ETF at quarter-end. The market read that as accumulation. The next quarterly filing showed the bank had exited entirely: it had been unwinding while the previous filing was still being celebrated.

This matters more for a 24/7 asset than for a blue-chip stake. It is also not the only way a quarter-end snapshot misleads: managers have long been accused of tidying up positions precisely because they know the last day of the quarter is the one that gets photographed, a habit covered in our post on 13F window dressing.

Who’s Actually Behind the Numbers

“Institutions are buying” flattens a very mixed group. Dakota’s 2026 breakdown — which notes spot Bitcoin ETF assets crossed $200 billion within 28 months of the January 2024 launch, calling it “the fastest ETF accumulation in history” — sorts 13F filers into six categories: hedge funds, RIAs and multi-family offices, endowments, state pension funds, corporate treasuries, and wirehouses. Each has a different mandate and a different reason to be in the data.

The categories move in opposite directions, which is why an aggregate number hides more than it shows. CoinShares’ Q1 2026 analysis of 13F data found professional holders’ disclosed Bitcoin ETF exposure fell to 261,000 BTC-equivalent (about $17.8 billion) from 313,000 in Q4 2025: down 17% in units but 35% in dollars, the same split Harvard’s two filings show. That took professional filers to 20.8% of total U.S. spot Bitcoin ETF assets from 24.7% the quarter before. Inside that decline, bank holdings rose 339% year-over-year, while hedge fund holdings fell 39% and brokerage holdings 53% quarter-over-quarter. Banks arriving and hedge funds leaving nets out to a single headline number that describes neither.

What a 13F Still Can’t Tell You About Institutional Crypto Exposure

Whose money it is.A 13F reports positions a manager has discretion over, without splitting proprietary capital from client assets. TFTC makes this explicit about Santander: the filing “does not specify whether Santander’s IBIT shares are a proprietary balance-sheet allocation or a client-custodied position.” The discretion code helps a little — Harvard’s crypto line is marked SOLE, Santander’s DFND — but it describes authority, not ownership.

Everything that isn’t a long equity position.Futures, swaps, and directly held coins sit outside the form entirely. So do in-house products: CoinShares reads Morgan Stanley’s full exit from an 8,300 BTC-equivalent position as related to the April launch of MSBT, the firm’s own bitcoin ETF, which “does not yet appear in 13F filings” the way a third-party fund does. On paper that looks like capitulation. In practice it may be a change of wrapper.

Anything a manager was permitted to withhold. Positions can be omitted from the public version of a filing under 13F confidential treatment. The published table is what a manager had to show you on that date, which is not always everything it held.

How to Pull a Crypto ETF Line Off EDGAR Yourself

The whole workflow takes about two minutes once you have done it once, and it works for any filer on August 14.

Do this for two consecutive quarters and you will have done more than most of the coverage that follows the August 14 filings, which will quote one number, from one filer, describing one day six weeks ago.