When the ProShares Bitcoin Strategy ETF (ticker: BITO) burst onto Wall Street in October 2021, it did something nobody had pulled off before: it gave everyday American investors a regulated, brokerage-friendly way to bet on Bitcoin without ever touching a crypto wallet. The launch was loud, chaotic, and historic — and it kicked open the door for everything that came after.

But BITO is not your typical crypto investment. It does not hold actual Bitcoin. It does not mirror spot prices perfectly. And in a market that now has a dozen spot Bitcoin ETFs to choose from, it is worth asking: what is the ProShares Bitcoin ETF really doing, and does it still belong in a modern portfolio?

What Is the ProShares Bitcoin ETF?

The ProShares Bitcoin ETF is the common name for the ProShares Bitcoin Strategy ETF, which trades on the NYSE Arca under the ticker BITO. It launched on October 19, 2021, after the U.S. Securities and Exchange Commission gave the green light — making it the first Bitcoin-linked exchange-traded fund ever approved for U.S. investors.

At launch, BITO pulled in over a billion dollars in assets in just two days, briefly becoming one of the most successful ETF debuts in history. The product gave traditional brokers, retirement accounts, and even skeptical financial advisors a familiar wrapper to gain Bitcoin exposure through vehicles they already understood.

Futures, Not Spot: The Key Distinction

This is the part that often gets lost in the headlines. BITO does not buy Bitcoin. Instead, it invests in Bitcoin futures contracts traded on the Chicago Mercantile Exchange (CME). Futures are agreements to buy or sell an asset at a set price on a future date — meaning the fund is effectively betting on where Bitcoin's price is heading, not directly owning the coins themselves.

That structural choice was deliberate. Regulators were far more comfortable approving a product tied to regulated futures markets than one holding actual cryptocurrency, and it took another two and a half years before spot Bitcoin ETFs finally got the nod in January 2024.

How BITO Actually Works

BITO holds a rolling portfolio of front-month and longer-dated CME Bitcoin futures. Because futures contracts expire, the fund must constantly "roll" its positions into new contracts to maintain exposure — a process that has real consequences for returns.

The Contango Problem

Bitcoin futures markets have historically traded in contango, meaning future-dated contracts price higher than the current spot price. Every time BITO rolls its positions, it effectively buys high and sells low — a structural drag known as negative roll yield.

  • In strongly bullish markets, contango drag can eat 5–15% of annual returns.
  • In sideways or bearish markets, the gap between futures and spot often narrows, reducing the drag.
  • Spot ETFs do not suffer this drag because they hold the underlying asset directly.

This is the single biggest reason BITO tends to underperform spot Bitcoin over long holding periods, especially during roaring bull runs.

Expense Ratio and Mechanics

BITO charges a 0.95% expense ratio — competitive for thematic funds but higher than most broad-market ETFs. There is no leverage, no staking yield, and no direct ownership of Bitcoin. Investors are essentially buying a derivative wrapper around a derivative product.

Why Investors Poured In — and What Changed

The initial excitement around BITO was impossible to ignore. For years, crypto-curious investors had been locked out of clean, regulated access. Suddenly, anyone with a brokerage account could add a Bitcoin-tilted position to their IRA or 401(k) rollover in minutes.

That accessibility drove massive volume. BITO routinely traded hundreds of millions of dollars a day in its early months and regularly topped futures-based product flows globally. For traditional finance, it was the moment crypto went mainstream.

The Spot ETF Era Changed Everything

In January 2024, the SEC approved the first batch of spot Bitcoin ETFs, including products from BlackRock, Fidelity, and others. These funds hold actual Bitcoin and have expense ratios as low as 0.20%. Predictably, investor attention — and capital — migrated quickly.

  • Spot ETFs attracted tens of billions in inflows within months.
  • BITO saw meaningful outflows as investors rotated into cheaper, simpler products.
  • Futures-based ETFs became more of a tactical tool than a core holding.

That said, BITO did not disappear. It still trades heavy volume and remains useful for short-term traders, hedge funds, and investors in retirement accounts that restrict crypto spot products.

Risks and Criticisms Worth Knowing

Even setting aside contango, BITO carries a stack of risks that any prospective buyer should understand before clicking "buy."

Volatility and Tracking Error

Bitcoin is one of the most volatile assets on the planet, and futures-based exposure can amplify that. Tracking error — the gap between BITO's returns and Bitcoin's actual price moves — can be significant over short windows, particularly during sharp rallies or crashes.

Regulatory and Tax Headaches

Futures are taxed as Section 1256 contracts, which offers some advantages (a blend of short- and long-term capital gains rates) but also creates complexity. Gains on spot Bitcoin held directly are now generally taxed as property. The difference can materially impact after-tax returns.

BITO made Bitcoin investing easy. Spot ETFs made it better. Knowing which one you own — and why — is the difference between a strategic allocation and an expensive lesson.

Key Takeaways

  • The ProShares Bitcoin Strategy ETF (BITO) was the first U.S.-approved Bitcoin ETF, launching in October 2021.
  • It holds CME Bitcoin futures, not actual Bitcoin — which introduces contango drag and tracking error.
  • BITO charges a 0.95% expense ratio and tends to underperform spot Bitcoin over long periods.
  • The 2024 approval of spot Bitcoin ETFs reshaped the landscape, pulling capital away from futures-based products.
  • BITO still has a role for short-term traders and certain retirement accounts, but most long-term investors now prefer spot ETFs for cleaner exposure.