November outflows from the 11 funds, which reached a monthly record $3.79 billion on Thursday, hovered at roughly the same total as the previous all-time high—set this February—after Friday's rally, according to data from U.K. asset manager Farside Investors. On Thursday, the ETFs recorded their second highest daily outflows, more than $900 million.

The recent outflows, a rare misstep for the dramatically successful products, have dovetailed with a six-week slump in Bitcoin's price. The largest cryptocurrency by market capitalization plunged to $81,000 early Friday, its lowest mark since early April.