Which publicly traded companies are actually holding Bitcoin instead of just talking big and speculating on stock prices? This page is all you need.
The largest is still MicroStrategy, holding more than the total of all others combined. Most are still mining companies, with very few emerging players.
Of course, there are also many large holding institutions that are not publicly listed, such as Bullish's over 100,000, Bitmain, Li Lin's family office, etc., which could rank at the top of this list.
https://www.coingecko.com/en/public-companies-bitcoin