The most important difference between ProShares Bitcoin ETF and iShares Bitcoin Trust ETF is not their recent return. It is what each fund owns. BITO obtains exposure through bitcoin futures and swaps; IBIT holds bitcoin. That design choice determines tracking behavior, operating costs and the risks investors accept.
BITO was useful when U.S. investors could not buy a spot bitcoin exchange-traded product. It launched in October 2021 and offered a familiar brokerage wrapper. But futures expire. To maintain exposure, the fund must sell contracts approaching expiration and buy later contracts. When later-dated futures are more expensive—a condition called contango—the roll reduces the exposure purchased with the same capital. Backwardation can help instead, so “roll cost” is not guaranteed every month.
Fees compound the structural difference
ProShares’ current materials state that BITO invests in futures and swaps rather than bitcoin. BlackRock’s IBIT page lists a 0.25% sponsor fee and describes the trust as a way to obtain bitcoin exposure without handling custody directly. A lower stated fee does not guarantee better returns, but it gives a spot vehicle a smaller recurring hurdle before tracking differences.
The source comparison reported that in the year to October 7, 2026, BITO fell 35.76%, IBIT fell 33.79% and bitcoin fell 29.64%. Over that period, BITO lagged IBIT by 1.97 percentage points and IBIT lagged the asset by 4.15 points. Those gaps combine fees, trading hours, price methodology, distributions and market frictions; they should not be attributed entirely to futures rolls.
Price-only comparisons can also mislead. Futures funds may distribute income or gains, so total return is the appropriate measure. The fair test uses identical dates, includes distributions and recognizes that a share price can change after payouts. The original figures are useful directional evidence, not a complete attribution study.
Liquidity and taxes can outweigh a small tracking gap
BITO remains an actively traded instrument with a long options history. Traders may prefer it for tactical positions, options strategies or accounts whose mandates treat futures funds differently. IBIT is usually the cleaner choice for a long-only investor seeking persistent spot exposure, but it still carries custody, regulatory, market-structure and bitcoin-price risk.
Tax treatment can differ as well. BITO’s futures activity and distributions may create a different tax profile from a grantor trust holding bitcoin. An investor considering a switch should compare after-tax total returns, cost basis and account type rather than selling solely because a chart shows underperformance.
What the investor is actually choosing
An investor is making two decisions: whether to own bitcoin exposure and which wrapper to use. Choosing IBIT over BITO removes the need to roll futures, but it does not reduce bitcoin volatility. Choosing BITO preserves a derivatives-based tool that may suit short-term trading but introduces contract-curve economics.
The evidence therefore supports a narrower conclusion than “futures funds always lose.” For long holding periods, direct-holding products have a structural advantage when the futures curve is frequently in contango and fees are lower. For shorter or options-driven strategies, liquidity and instrument features may justify BITO. The wrapper should match the job.
Sources: https://www.proshares.com/our-etfs/strategic/bito ; https://www.ishares.com/us/products/333011/ishares-bitcoin-t ; https://www.sec.gov/Archives/edgar/data/1980994/000143774926026004/bit20260630c_10q.htm