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Maybe the heading just needs to be updated to something more reflective of what you're tracking.
The column was meant to be exactly the percentage of the BTC investment over the market capitalisation.
The purpose was to tell how much the firm is a bitcoin firm.
If the firm put all his asset in bitcoin, then the bitcoin investment would be equal to his market capitalisation (like Grayscale, basically).
Also, Galaxy Digital's link shows holdings of 14,651 btc, not 16,651. Is that a mistake or do you have a more updated number somewhere? It makes an $1100 in their average price cost basis.
I was lazy, and copied the bitcointreasury.org data in the spreadsheet. I noticed a few errors (HUT8 data are CAD, not USD), but I didnt notice this one. Thanks for pointing out, I fixed it.