When considering a Bitcoin Exchange-Traded Fund (ETF) for a retirement portfolio, the assumption might be that all such funds offer similar exposure to the digital currency. However, a closer examination reveals a notable divergence in returns between funds that invest in Bitcoin futures contracts and those that directly hold Bitcoin. Over a twelve-month period, a significant gap in performance was observed, with futures-based ETFs lagging behind their spot-holding counterparts, resulting in thousands of dollars in lost returns on a substantial investment.
For instance, a hypothetical investment of $300,000 in the ProShares Bitcoin ETF (BITO) yielded a return of -30.46% from November 3, 2025, to November 2, 2026. In stark contrast, the iShares Bitcoin Trust ETF (IBIT), which directly holds Bitcoin, experienced a return of -28.38% over the identical timeframe. This discrepancy translates to BITO underperforming IBIT by $6,240. Bitcoin itself saw a decline of 27.64% during this period, indicating that BITO's losses were more pronounced than both the underlying asset and the spot funds.
This performance disparity is not an isolated incident. The Fidelity Wise Origin Bitcoin Fund (FBTC), another spot Bitcoin ETF, delivered a -28.3% return in the same period, trailing BITO by $6,480 on the same $300,000 investment. The close alignment in returns between IBIT and FBTC, both direct-holding funds, further underscores the consistent underperformance of BITO.
While management fees play a role in investment returns, they do not fully account for the observed gap. BITO's expense ratio is 0.95%, costing $95 annually per $10,000 invested, compared to IBIT's sponsor fee of 0.25%, or $25 per $10,000. Over a decade, this fee difference on a $10,000 investment would compound to approximately $663, and over two decades, about $1,250. At a $300,000 starting balance, the annual fee difference is around $2,100. Clearly, other factors are at play.
A primary driver of this underperformance in futures-based ETFs is the concept of "futures rolls." Unlike spot ETFs that hold Bitcoin directly, BITO invests in Bitcoin through futures contracts. These contracts have expiration dates, necessitating a monthly process where expiring contracts are sold, and new contracts with later expiration dates are purchased. This rolling process incurs a cost, particularly when later-dated contracts are priced higher than expiring ones, a market condition known as contango. In such scenarios, each roll effectively trades a cheaper contract for a more expensive one, subtly eroding returns without being explicitly listed as a fee. Conversely, in a market condition called backwardation, where futures prices are below spot prices, the roll can actually enhance returns.
Conversely, IBIT and FBTC, by holding actual Bitcoin through a custodian, completely bypass these roll costs. However, futures contracts do require only a fraction of their value upfront, leaving a significant portion of BITO's capital idle, which is then invested in money market instruments, such as the ProShares GENIUS Money Market ETF, as of August 31, 2026, comprising 67.95% of BITO's net assets. The interest earned on this cash can partially offset the costs associated with futures rolls.
For investors not holding their assets in an IRA, BITO's monthly distributions, totaling $1.646534 per share over the past year, can trigger a tax liability, even in a year where the fund incurred losses. While the presented returns incorporate these distributions, they do not factor in the tax implications.
The emergence of spot Bitcoin ETFs like IBIT and FBTC offers a direct and often more cost-effective alternative to futures-based funds, with IBIT's fee being roughly a quarter of BITO's. While BITO, launched in October 2021, is a regulated fund, spot Bitcoin trusts operate under a different regulatory framework. Nonetheless, for those seeking pure Bitcoin price exposure, the additional costs inherent in the futures structure are now largely avoidable.
Investors should critically evaluate their Bitcoin ETF choices by understanding the underlying asset-holding mechanism. Ascertain whether the fund directly holds the cryptocurrency or invests in futures contracts. Furthermore, it is prudent to compare the fund's performance against spot alternatives over the past year to fully grasp the impact of its structure on returns. A spot fund inherently avoids the roll costs associated with futures, and the performance gap clearly illustrates the financial implications of choosing one structure over the other. This transparency empowers investors to make more informed decisions aligned with their financial goals.
