UBS's Bitcoin ETF Call Line Went Up 24 Times In One Quarter

UBS Group AG reported 1,950,000 call underlying shares on BlackRock’s iShares Bitcoin Trust at the end of June, against 80,000 at the end of March. That is a rise of 2,337.5 per cent, or a little over 24 times, and it is the largest single move in the Swiss bank’s bitcoin book in the filing. The Form 13F carrying it was accepted by the US Securities and Exchange Commission on 13 August.

The rest of the same filing is what gives the number its shape. UBS did not buy much more of the fund itself: its holding of ordinary IBIT shares rose 11.9 per cent, from 364,371 to 407,890. The put line went the other way, falling from 303,300 underlying shares to 143,300, a drop of 52.75 per cent.

The three lines, side by side

Every figure below is read directly from the two information tables, not from a summary of them. A 13F reports an option position at the market value of the shares underlying it, not at the premium paid, so the call line is a claim on 1.95 million IBIT shares rather than $64.9m spent.

Netting the two option lines is the clearest way to read it. At the end of March, UBS’s IBIT options came to 223,300 more put shares than call shares. At the end of June they came to 1,806,700 more call shares than put shares. The direction of the book reversed inside a single quarter.

Why did the value fall while the share count rose?

Because the fund did. IBIT is priced in both filings at the quarter-end close, and the filings imply $38.42 a share on 31 March and $33.29 on 30 June, a fall of 13.4 per cent. So UBS’s outright holding gained 43,519 shares and still shrank in reported value, from $13,999,134 to $13,578,659.

That is the detail worth carrying out of the filing. The call line was not built during a rally. It was built through a quarter in which the spot bitcoin ETF it tracks lost an eighth of its price.

Where it sits in the wider book

IBIT is not where most of UBS’s crypto-linked exposure lives. The same filing carries far larger positions in the two listed companies most closely tied to the asset, and reading the call line beside them keeps it in proportion.

By reported value, the Strategy holding alone is $430.2m and the Coinbase holding $338.3m, against $13.6m of IBIT held outright. Note also that Coinbase is the one line of the three where puts still outweigh calls. Whatever changed in the bitcoin ETF book did not change everywhere.

One more line moved in the same direction: UBS’s holding of the iShares Ethereum Trust roughly doubled, from 346,272 shares to 697,692, and the 45,700-share put line it carried in March is absent in June.

What does a 13F actually show?

It shows long positions in US-listed equities and certain options as at one date, for managers with at least $100m under discretion, filed within 45 days of quarter end. It does not show short stock, cash, non-US holdings, or anything about intent. There is no field for why.

That last gap is the whole caution here. UBS is one of the world’s largest broker-dealers and a market maker in listed options, and a 13F consolidates positions across the group, including inventory held against client trades. A call line multiplying by 24 is consistent with a directional view on Bitcoin; it is equally consistent with facing off client demand for upside exposure, or with a hedge against something the form does not cover. UBS reported the positions under defined investment discretion and published no comment alongside them.

What the filing does establish, without inference, is the shape of the change: an options book that leaned toward puts in March leaned heavily toward calls in June, while the fund underneath it fell, and while the bank’s much larger bets on bitcoin treasury companies and the exchange sector stayed roughly where they were.