Not the OP, but check out the below examples. Beneficiaries across the range, from fundamental equity funds, quant funds, and distressed funds. The retail guys weren't just buying shares from themselves and market makers.

https://www.wsj.com/articles/this-hedge-fund-made-700-millio...

https://www.washingtonpost.com/business/2021/02/08/gamestop-...

https://www.reuters.com/article/us-amc-ent-holdg-silver-lake...