TLDRJane Street increased its Fidelity Bitcoin ETF holdings nearly eightfold during Q3 2026.Fidelity’s FBTC position reached approximately $509.2 million, compared with $45.3 million in June.BlackRock’s IBIT share count declined 18.7%, although its reported market value increased.ARKB holdings climbed 333%, reaching approximately 11.69 million shares by September 30.Combined holdings across the three Bitcoin ETFs increased in value to approximately $1.79 billion.Jane Street Group nearly octupled its Fidelity Bitcoin ETF share count during the third quarter. Meanwhile, the trading firm reduced its BlackRock IBIT holdings by approximately 19%. Its stakes across three Bitcoin ETFs reached $1.79 billion in reported market value.Fidelity Shares Rise as IBIT Holdings DeclineJane Street’s September 30 filing reported 7,010,008 shares of Fidelity Wise Origin Bitcoin Fund (FBTC). That compared with 886,736 shares in its June 30 disclosure. The roughly 691% increase added 6.12 million shares to its reported position. FBTC’s market value climbed from $45.3 million to approximately $509.2 million.Meanwhile, Jane Street’s iShares Bitcoin Trust ETF (IBIT) holdings declined from 24,878,191 shares to 20,221,140. The reduction totaled approximately 4.66 million shares, representing an 18.7% quarterly decrease. The value of its IBIT shares increased despite the smaller position. The reported valuation rose from $828.2 million in June to $957.3 million in September. IBIT remained its largest holding among these three funds, measured by reported market value.ARKB Growth Broadens the PictureThe firm also increased its ARK 21Shares Bitcoin ETF (ARKB) share count. Its position rose from 2,700,151 shares to 11,689,194, including separately listed smaller holdings. That increase totaled approximately 8.99 million shares, equivalent to 333%. The position’s reported value climbed from $52.5 million to $323.7 million. Collectively, the three ETF positions were valued at approximately $926 million at June’s close. By September 30, their combined reported value had increased to approximately $1.79 billion.IBIT’s portion of that combined value fell from roughly 89% to 53%. However, changing ETF prices also contributed to the overall valuation changes. The latest filing follows Jane Street’s earlier reductions in Bitcoin ETF holdings.Options Holdings Complicate the InterpretationThe September disclosure also listed IBIT call options covering 34.97 million underlying shares. Separately, put options referenced 45.32 million underlying shares. The June filing listed calls referencing 34.03 million shares and puts referencing 34.80 million. These positions differ from the reported holdings of ETF shares. Under SEC Form 13F guidance, managers report qualifying options separately. Short positions and written options are excluded.Jane Street submitted its third-quarter report on November 12, more than six weeks after quarter-end. Unlike daily ETF flow reports, Form 13F tracks a manager’s reportable quarter-end holdings. These snapshots cannot identify fund creations or redemptions attributable to that manager.The post Jane Street’s Bitcoin ETF Stakes Reach $1.79 Billion appeared first on Blockonomi.