Marketaxess Holdings Inc.
A fintech that runs electronic trading platforms where institutions buy and sell bonds and other fixed-income credit products, connecting roughly two thousand banks and investors worldwide through its X-Pro platform and "Open Trading" marketplace. It was born in 2000 as an internal project at J.P. Morgan before spinning out as an independent company. Its name is a portmanteau of "market" and "access" — fitting, since its founder set out to modernize a bond market that then ran mostly by phone.
Estimated from filings — the split-adjusted price range over the quarters each manager built the position. A range, not a fill price; 13F reports a quarter-end snapshot, not a trade date.