https://twitter.com/Coin98Analytics/status/1315853890424717312

We heard about Square investing in Bitcoin and I am sure many of you know about Grayscale but let's look at other publicly traded companies who purchased Bitcoin.
Total value for all of them is over $6 billion or around 600,000 BTC, but I am sure there are many more who not so famous or they purchased it with some 3rd party firms.
13 companies are holding around 2.85% of the total supply of Bitcoin.
Let's compare all of them:

449,596 Grayscale
  69,730 CoinShares
  38,250 MicroStrategy
  16,551 Galaxy digital
    8,195 3iQ
    5,215 BTCe
    4,709 Square
    2,954 HUT8
    1,239 Voyager
    1,053 Riot
       215 digital
       204 cypher punk holdings
       126 argo
 
More detailed report on Bitcoin Treasuries website:

https://bitcointreasuries.org/

Some say that Grayscale doesn't own any Bitcoin but that is for debate because they are Investment Trust, and their clients are buyers who own bitcoins.