Answer · confidence: partial
How much do top US bitcoin funds hold now versus six months ago?
Research question: How much do the largest US spot bitcoin funds hold in total, and how has that total changed over the past six months?
The verified facts do not give a combined total for the largest US spot bitcoin funds, so the question can only be partly answered. The newest fact, dated October 8, 2026, shows BlackRock's IBIT holding $68.67 billion and Fidelity's FBTC holding $15.66 billion 9. The only fund with comparable data across the six-month window is Bitwise, whose holdings were about $3.37 billion at December 31, 2025 and about $3.36 billion at March 31, 2026, a roughly flat change 21. US spot Bitcoin ETFs drew $1.97 billion in inflows during April 2026, but the records do not connect that figure to the holdings of the named funds 6.
Checked 2026-10-18. Only documented and supported facts are used.
Dig deeper on this questionSources
[1] documented
As of March 31, 2026, the Bitwise Bitcoin ETF held a total market value of approximately $3.36 billion in bitcoin based on the Principal Market NAV.
"The total market value of the Trust's bitcoin held was $ 3,367,646,692 based on the price of a bitcoin (Lukka Prime Rate) in the principal market (Crypto.com) of $ 87,544.00 , used to determine the Trust's Principal Market NAV."Bitwise Bitcoin ETF - Form 10-Q - FY2026
[2] documented
As of December 31, 2025, the Bitwise Bitcoin ETF held a total market value of approximately $3.37 billion in bitcoin based on the Principal Market NAV.
"Ending balance as of December 31, 2025 38,468.0468 $ 3,367,647"Bitwise Bitcoin ETF - Form 10-Q - FY2026
[3] documented
As of March 31, 2025, the Bitwise Bitcoin ETF held a total market value of approximately $3.13 billion in bitcoin based on the Principal Market NAV.
"The total market value of the Trust's bitcoin held was $3,133,221,421 based on the price of a bitcoin (Lukka Prime Rate) in the principal market (Crypto.com) of $82,445.02, used to determine the Trust's Principal Market NAV."Bitwise Bitcoin ETF - Form 10-Q - FY2026
[4] documented
The Bitwise Bitcoin ETF pays a Sponsor Fee of 0.20% per annum on its bitcoin holdings.
"The Trust pays a Sponsor Fee of 0.20 % per annum of the Trust’s bitcoin holdings."Bitwise Bitcoin ETF - Form 10-Q - FY2026
[5] documented
The Bitwise Bitcoin ETF commenced operations on January 10, 2024.
"The Trust’s commencement of operations was January 10, 2024."Bitwise Bitcoin ETF - Form 10-Q - FY2026
[6] supported
US spot Bitcoin ETFs attracted $1.97 billion in inflows during April.
"US spot Bitcoin ETFs drew $1.97 billion in April, the best month of 2026, as BlackRock's IBIT led institutional demand."Spot Bitcoin ETFs Pull $1.97 Billion in Biggest Monthly Surge Since November
[7] supported
The US spot Bitcoin ETFs launched in January 2024 when the SEC approved 11 products simultaneously.
"Spot Bitcoin ETFs launched in January 2024, when the SEC approved 11 products simultaneously."Bitcoin ETF Ownership in 2026: How Institutions Actually Decide to Allocate
[8] supported
The primary structural shift that enabled institutional implementation of Bitcoin ETFs was the move from futures-based exposure to spot ETFs with vault custody.
"Earlier ETF products offering Bitcoin exposure were futures-based; the newer generation holds an actual claim on Bitcoin held in vault custody. That structural shift, not a change in the investment thesis, was what made implementation possible."Bitcoin ETF Ownership in 2026: How Institutions Actually Decide to Allocate
[9] supported
BlackRock's iShares Bitcoin Trust (IBIT) holds $68.67 billion, more than four times the size of second-place Fidelity's FBTC at $15.66 billion, so it accounts for a large share of the total.
"It holds $68.67 billion in assets, which is more than four times the size of second-place Fidelity FBTC at $15.66 billion."Bitcoin ETF Statistics 2026: Complete Data on Inflows, AUM and ...