ProShares Bitcoin ETF (BITO)

BITO does not hold Bitcoin. It holds Bitcoin futures contracts, month after month, rolling them forward as they near expiration. ProShares is the operator; the contracts trade on the Chicago Mercantile Exchange (CME). Shareholders own an ETF that profits when Bitcoin futures rise and loses when they fall, but no shareholder has ever seen a physical Bitcoin.

This distinction matters. When the first Bitcoin spot ETF appeared in early 2024, it marked a philosophical shift away from BITO’s design. That spot fund holds real Bitcoin in custody. BITO’s fundamental architecture — rolling futures — was the only option available to ETF sponsors for years. The SEC approved BITO on the grounds that it was tracking the commodity Bitcoin through a regulated derivatives market. Spot ETFs were a new frontier that the SEC had previously resisted.

Why not just hold Bitcoin outright? Regulatory barriers. The SEC was cautious about approving funds that held custody of cryptocurrency, particularly one as young and volatile as Bitcoin. Futures offered a path: the CME is a regulated exchange, futures contracts are tracked and margined transparently, and the regulatory environment was mature. So ProShares was licensed to hold futures, and that became the default way Americans could own Bitcoin in a 401k or an IRA or through a standard broker without managing private keys or standing up digital wallets.

The catch is contango. Bitcoin futures trade at prices slightly higher than the spot Bitcoin price — the market is in contango, meaning future months are more expensive than near months. As BITO rolls its near-month contracts into the next month, it is selling cheap and buying expensive, a cost that drags on returns over time. In a rising market, this drag is often invisible because Bitcoin’s underlying price appreciation overwhelms it. In a sideways or falling market, contango decay becomes visible: BITO’s price falls more than spot Bitcoin fell, and the difference is the cost of holding futures instead of the underlying.

The prospectus is explicit: the fund may not track spot Bitcoin perfectly. ProShares does not guarantee daily replication, though they have generally kept tracking error modest. The bid-ask spread on BITO itself — the gap between the buy and sell prices on the market — is usually tight, but investors should understand they are always trading ETF shares for other ETF shares, not Bitcoin for dollars and back. The fund’s NAV drifts slightly from pure Bitcoin price action because of the futures basis, rebalancing costs, and the expense ratio.

Liquidity is abundant. BITO trades millions of shares daily. That deep liquidity means an investor can buy or sell a meaningful quantity without moving the price much, which is valuable if you ever need to exit quickly. An investor holding spot Bitcoin faces a different problem: custodial delays, withdrawal fees, and the operational friction of managing an actual digital asset.

The tax treatment is not ideal. Bitcoin held directly is a capital asset, taxed on long-term holding as either short- or long-term gain depending on holding period. BITO is often classified as a commodity fund, which means distributions can be taxed as ordinary income, and gains may be marked-to-market annually under IRC Section 1256 rules, even if you did not sell. The tax efficiency is lower than a spot Bitcoin ETF would be. Investors holding BITO in taxable accounts should consult a tax advisor.

In the years before spot Bitcoin ETFs arrived, BITO was the best available option for many investors. It provided liquid, regulated, brokerage-accessible Bitcoin exposure without the operational burdens of key management or the regulatory complexity of custody. For some — particularly those in institutions that cannot yet adopt spot Bitcoin funds or those with strong cost-of-capital constraints — BITO remains the right choice. But the gap between futures-based and spot-based Bitcoin exposure has narrowed. Spot ETFs are here. New entrants to Bitcoin exposure have simpler options.

Where BITO retains value is existing shareholder relationships and, in some cases, lower expense ratios than newer spot funds. It also remains the standard choice for investors who opened positions early and have large embedded gains; switching to a spot ETF would trigger taxable events. The tracking difference has been modest in practice — BITO has kept pace with Bitcoin reasonably well despite the theoretical contango drag. But going forward, the default choice for new Bitcoin allocation will likely shift toward spot, and BITO’s role will narrow to those grandfathered into it by prior holdings.