Barclays increased its stake in BlackRock's iShares Bitcoin Trust (IBIT) by 48% during Q3, holding 3.94 million shares as of September 30 compared to 2.66 million at the end of June, according to 13F filings reported by Cointelegraph. The position value grew from approximately $88.5 million to roughly $187 million over the quarter. Citigroup opened a new position in Fidelity's Wise Origin Bitcoin Fund (FBTC) worth approximately $119 million and expanded its IBIT holdings by 50% to about 521,000 shares. Data from Bitwise shows that banks collectively held $258 million in spot Bitcoin ETFs among 1,389 institutions that have filed Q3 reports, with their share rising from 3.2% in Q2 to 4.9%. JPMorgan, Wells Fargo, and hedge funds Millennium and Schonfeld have yet to submit their filings; the deadline for institutional Q3 reports is next Monday.