Wall Street must show its Bitcoin ETF books by August 14. The loss number is ugly.
The next Bitcoin ETF story is not another launch. It's whether big managers held through the May-June pain.
CryptoVibe Desk · bitcoin · etfs · blackrock
- →Large U.S. managers over the $100 million 13F line must disclose June 30 Bitcoin ETF positions by August 14.
- →CryptoSlate reports Bloomberg Intelligence sees the average ETF capital cost near $82,249, leaving holders about 22% underwater.
- →Watch whether IBIT positions grew, held, or fell in Q2 filings, because that says who treated the dip as noise.
- Form 13F → A quarterly SEC filing that shows which U.S.-listed securities large investment managers held at quarter end.
- Cost basis → The average price an investor paid for a position.
- Unrealized loss → A paper loss on something still held, before it is sold.
August 14, 2026 is the next Bitcoin ETF date. Large U.S. investment managers over the $100 million 13F threshold must file Q2 holdings by then, per SEC guidance. Those filings show positions held as of June 30.
The number to watch is not another daily flow print. It is who still owned spot Bitcoin ETF shares after the May-June outflow stretch. CryptoSlate reports Bloomberg Intelligence estimates the average net cost basis for U.S. spot Bitcoin ETF capital at about $82,249.
That puts the cohort about 22% underwater, with $16.33 billion in unrealized losses, according to the same report. Those figures come from CryptoSlate's Bloomberg Intelligence citation, not a directly linked Bloomberg table. So treat them as the cited estimate, not gospel.
The tape still matters. If managers added, the ETF bid looks more durable than the drawdown suggested. If they cut positions by June 30, the institutional Bitcoin story gets messier. Your bag does not move on belief alone. It moves when real allocators either stay or leave.
BlackRock remains the first name to check. IBIT listed $46.86 billion in net assets and 1.30 billion shares outstanding as of July 28 on its iShares page. That is the largest public surface for this trade in the data given here.
There is one math problem in the story. CryptoSlate flags that a 22% loss on $16.33 billion points to a capital base near $74 billion. That sits above the cumulative net inflow figure the story cites from Farside. The numbers don't add up cleanly, which makes the 13F reveal more useful.
The filing round will not show every holder. It will show the large managers that had reportable U.S. securities positions at quarter end. That is enough to separate sticky ETF ownership from a fast trade that looked institutional until the price moved against it.
By August 14, the market gets names, sizes, and exits. That is cash-position evidence, not a sentiment survey. The catalyst is named.
IBIT's June 30 holder list is the cleanest read on big-money conviction, because $46.86 billion in net assets makes BlackRock the center of the trade.
By August 14, watch whether at least five large managers report lower spot Bitcoin ETF positions versus Q1, because that would confirm real selling into the May-June stretch.
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