Who owns it and what it is
Foundry Digital LLC is a Delaware limited liability company, which is how it identifies itself in a hosting agreement Stronghold Digital Mining filed with the SEC as an exhibit in July 2024. Its offices are in Rochester, New York. It is owned by Digital Currency Group, which lists it on its own portfolio page with a first investment date of 1 January 2019 and describes it as one of "the businesses we own". The SEC's own staff put the relationship plainly in a 2023 comment letter to TeraWulf, referring to "Digital Currency Group, which also owns Foundry". Foundry's site says Mike Colyer became founding chief executive in October 2019.
The business is not a mining company in the ordinary sense. It sells the things a large miner needs: a pool to point machines at, software called OptiFleet to manage them, and site operations run on behalf of clients. A separate DCG venture, Fortitude Mining, is described on Foundry's own site as its self-mining arm, and another, Yuma, works on Bittensor rather than Bitcoin.
The pool
Foundry USA Pool is the part that shows up in the block record, and it is the largest single share of block production. As of 21 August 2026 mempool.space attributed 261 of the previous 1,013 blocks to it, about 26 per cent, ahead of AntPool at about 21 per cent and F2Pool at about 14 per cent.
That number is the whole reason a directory entry for a pool matters. Twelve years earlier GHash.IO's 49 per cent over one day was treated as an emergency, and the pool spent a month promising to cap itself. A quarter of blocks is not half, and Foundry's share is sustained rather than a spike, which are different facts and worth keeping apart. The concentration question the industry argued about in 2014 was never settled. It moved.
Listing here is not endorsement.