they're one of the biggest hft players. (maybe even the biggest) they're the ones that put wedbush on the top of the nsdq volume every month... They're DMM's in a bunch on NYSE symbols... and I hear they're buying BAC's MM'ing business... (this change will make them the second largest specialist firm on the NYSE) http://www.businessweek.com/news/20...of-america-s-nyse-market-making-business.html Here's their homepage: http://www.getcollc.com/index.php/getco/landing/who_we_are/