Investors have pulled over a half of a billion dollars from the Grayscale Bitcoin Trust during its first days of trading as an ETF.

The fund, which won US Securities and Exchange Commission approval to convert to an ETF from a trust last week, has seen outflows totaling about US$579 million, according to data compiled by Bloomberg. It’s a stark difference from the other nine spot Bitcoin ETFs, which have pulled in a total of nearly $1.4 billion.

“Thanks to the ETF conversion this is the first time we’ve had clear sight into flows of GBTC,” said James Seyffart, an ETF analyst at Bloomberg Intelligence, who noted that investors may be profit-taking. 

The flow data is a more complete look at how the ETF fared in the wake of SEC approval. While over $2.3 billion of GBTC shares changed hands its first day, the outflows now indicate that a portion of that volume was due to selling. 

Grayscale didn’t respond to a request for comment. 

“Lots of this capital will find its way back into other Bitcoin exposures,” Seyffart said.

The outflows from Grayscale’s ETF aren’t entirely unexpected. Bloomberg Intelligence forecasted that the fund will drain over $1 billion over the coming weeks. Part of that will be driven by investors fleeing to cheaper spot Bitcoin ETFs. With an expense ratio of 1.5 per cent, GBTC is the most expensive US ETF that invests directly in Bitcoin. The second-most expensive fund, the VanEck Bitcoin Trust, charges 0.25 per cent. 

Other spot Bitcoin ETFs have all seen net inflows, with BlackRock’s IBIT pulling in nearly $500 million in its first two days of trading, and Fidelity’s FBTC getting roughly $421 million. The inflows suggest that even outside of potential seed funding from fund issuers, demand is strong for Bitcoin exposure in a physically backed ETF.