Hedge Funds Unwind Bitcoin Basis Trade as CME Net Shorts Fall 89%

Leveraged funds have cut their net short position in CME Bitcoin futures by 89% from the December 2024 peak, according to CFTC-style positioning data. As of November 3, 2026, they held a net short of 2,591 contracts, roughly 12,955 BTC — the smallest position since February 2023.

The retreat marks the effective unwinding of the Bitcoin basis trade, the carry strategy that became one of Wall Street's dominant Bitcoin exposures after spot ETFs launched. The math behind the exit is simple: the CME Bitcoin futures basis has compressed to 4.8% annualized, barely above US Treasury yields.

Why the basis trade stopped paying

The trade pairs long spot exposure, often via a spot Bitcoin ETF, with a short position in CME futures trading at a premium. The fund collects the spread as the futures contract converges with spot at expiry, remaining indifferent to Bitcoin's direction.

At a 4.8% annualized basis, funds can earn nearly the same return in government debt without margin calls, operational overhead, or crypto headline risk. When compensation for that complexity collapses, arbitrage desks stop allocating capital to it.

How much ETF exposure came out

The unwind shows on both legs of the trade. Nine hedge funds, including Millennium Management and Brevan Howard, trimmed roughly 68,000 BTC of spot Bitcoin ETF exposure between September 2025 and June 2026. That stake carried a value of approximately $5.4 billion.

CME activity has thinned in parallel. Open interest in CME Bitcoin futures fell to about 17,527 contracts, or 87,635 BTC, by early November 2026. Trading volume has also declined over the same period.

The net short level now stands at its lowest since February 2023, effectively rolling the market back to before the ETF-driven carry boom took hold.

Did funds flip bullish in August?

One anomaly punctuated the unwind. In August 2026, leveraged funds briefly flipped to a net long position in CME Bitcoin futures for the first time. The cohort has historically served as the market's structural short side, a function of the basis trade itself, and the flip has been read by some analysts as a signal of directional bullish sentiment.

What does this change for ETF flow data?

The unwind complicates how investors interpret ETF flow data in both directions. A meaningful share of past ETF buying came from hedged funds with no directional view on Bitcoin, so declining arbitrage activity may leave flows as a cleaner signal of genuine demand.

The reverse also holds. Some recent ETF outflows reflect funds selling ETF shares while closing futures shorts — dismantling a spread trade rather than betting against Bitcoin.

The variable to watch is the basis itself. At 4.8% annualized, the carry trade barely clears Treasury yields; if the futures premium widens materially, the economics return, and with them, most likely the hedge funds.