BlackRock adds its own Bitcoin ETF to its income and bond funds.

BlackRock’s income and bond-focused fund bought shares of the asset manager’s own spot Bitcoin (BTC) exchange-traded fund (ETF) in the first quarter, regulatory filings show.

BlackRock’s Strategic Income Opportunities Fund (BSIIX) purchased $3.56 million worth of iShares Bitcoin Trust (IBIT), and its Strategic Global Bond Fund (MAWIX) purchased $485,000, according to a May 28 Securities and Exchange Commission filing.

IBIT shares are part of the $37.4 billion and $776.4 million BSIIX and MAWIX investment portfolios, respectively.

IBIT currently holds $19.61 billion worth of Bitcoin, according to BlackRock data as of May 24.

That’s behind the converted Grayscale Bitcoin Trust (GBTC), which held $19.76 billion as of May 28, according to Grayscale data.

Spot Bitcoin ​ETFs currently hold over 1 million Bitcoins globally, worth over $68 billion. This represents nearly 5.10% of the circulating supply of BTC, which stands at over 19.7 million, according to CoinGecko.

Related: Wallets labeled Mt. Gox move billions of dollars in Bitcoin in hopes of recovery.

More than 600 U.S. investment firms have purchased spot Bitcoin ETFs since their launch in January, according to a recent SEC filing.

Morgan Stanley, JPMorgan, Wells Fargo, Royal Bank of Canada, BNP Paribas, UBS and hedge funds including Millennium Management and Schonfeld Strategic Advisors were some of the firm’s Bitcoin fund purchases.

Millennium is the largest spot Bitcoin ​​ETF accumulator with $1.9 billion invested, including $844.2 million in IBIT and $806.7 million in Fidelity Wise Origin Bitcoin Fund (FBTC).

On May 23, BlackRock was one of eight companies to approve a spot Ether (ETH) ETF bid in the United States, but the SEC must approve the company’s Form S-1 filing before the product can begin trading.

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