The State of Wisconsin Investment Board (SWIB) disclosed investments totaling $164 million in spot Bitcoin (CRYPTO:BTC) exchange-traded funds managed by BlackRock and Grayscale.

In a recent filing with the SEC, SWIB revealed holdings of over 2.4 million shares in BlackRock's iShares Bitcoin Trust and more than a million shares in Grayscale Bitcoin Trust.

These investments are part of SWIB's management of over $156 billion in assets, with a significant portion allocated to public equity investments, including shares in companies like Coinbase and MicroStrategy.

The SEC filing indicates growing institutional interest in cryptocurrency investments, following similar disclosures from major banks and investment firms.

With the SEC approving spot Bitcoin ETFs earlier this year, attention now turns to the potential approval of a spot Ether (CRYPTO:ETH) ETF by May 23.