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Re:The high-frequency trading arms race: frequent batch auct... by harryh on Wednesday October 20, 2021 @09:03AM (#28930145)
The big HFT firms are, in fact, well known.

https://medium.com/automation-generation/15-well-known-high-...

They're also regulated in various ways.

Re:The high-frequency trading arms race: frequent batch auct... by kasey_junk on Wednesday October 20, 2021 @06:04PM (#28937382)
In fact all of the nyse designated market makers are HFT firms.

https://www.nyse.com/markets/nyse/membership