U.S. Bitcoin ETFs See $516M in Outflows as Basis Trade Nears Historic Lows

Bitcoin exchange-traded funds (ETFs) in the U.S. saw their second-largest outflows of the year on Monday, with investors pulling $516.4 million as BTC slipped toward the $90,000 mark, Farside data shows.

This was the ninth net outflow in ten days, signaling growing investor unease as bitcoin struggled to hold its ground within the $94,000-$100,000 range. By Tuesday, the selling pressure had intensified, pushing BTC to a three-month low of $88,250.

Meanwhile, the bitcoin futures market showed signs of strain. Velo data revealed that the CME annualized basis—the gap between spot bitcoin prices and futures contracts—had shrunk to 4%, marking its lowest level since spot ETFs debuted in January 2024.

The diminishing spread is squeezing returns for traders using the basis trade strategy, where they long BTC in the spot market while shorting futures to capture a premium. With the current yield now trailing the 5% offered by U.S. 10-year Treasuries, many funds may opt to unwind positions, potentially triggering further ETF outflows and added selling pressure in the futures market.

BitMEX co-founder Arthur Hayes commented on the situation in an X post, hinting at a potential wave of position liquidations.

“Many IBIT holders are hedge funds playing the long ETF/short CME futures game for better yield than Treasuries,” Hayes noted. “Now that basis is dropping as BTC declines, they’ll likely exit IBIT and buy back CME futures. They’re already in profit, and with basis nearing UST yields, I expect them to unwind during U.S. hours. $70,000, I see you mofo!”

With ETF outflows accelerating and the futures market under pressure, the coming days could bring heightened volatility to bitcoin’s price action.