Vanguard, one of the largest asset managers in the world, will not be allowing customers to buy the newly approved bitcoin ETFs.

An attempt to invest in BlackRock's iShares Bitcoin Trust (IBIT) or Grayscale Bitcoin Trust (GBTC) via a Vanguard retirement brokerage account generated a "trade cannot be completed" warning.

"Buy orders are not currently accepted for this security," the message said. "Securities may be unavailable for purchase at Vanguard due to a number of variables including regulatory restrictions, corporate actions, or various trading and/or settlement limitations."

Read more: UBS Will Let Some Customers Trade Bitcoin ETFs, Contrary to Rumors: Source

A Vanguard spokesperson told CoinDesk that "spot Bitcoin ETFs will not be available for purchase on the Vanguard platform" and that it has no plans to offer Vanguard Bitcoin ETFs or other crypto-related products. The spokesperson said the reason behind this decision is that crypto-related products don't align with the asset manager's focus on asset classes that "build blocks of a well-balanced, long-term investment portfolio."

The Block reported Vanguard's plan to block bitcoin ETFs earlier.

Vanguard's unfriendliness contrasts with the embrace of bitcoin ETF by some of the company's largest rivals, including BlackRock, Fidelity and Invesco, which have created bitcoin ETFs that started trading Thursday. They won U.S. Securities and Exchange Commission permission to do so on Wednesday.

Charles Schwab, another brokerage, confirmed Thursday that it's letting customers trade bitcoin ETFs.

Update (Jan. 11, 2024, 19:07 UTC): Added statement from a Vanguard spokesperson.