Two years ago Raj Mahajan came into Goldman Sachs Group as a partner. That was a sign of the firm's regard for Mahajan and his trading technology background as he took on the role of global head of equities electronic execution services. A year ago he was named co-head of global execution services; he told Reuters at the time that "simply put, we want to deliver the best execution quality to our clients, which is tantamount to saying we need the best technology."
Mahajan, 44, had worked as an analyst at Goldman early in his career, and he returned as a successful technologist and entrepreneur. In 2000 he co-founded — with former Goldman chief information officer and now CFO-designate R. Martin Chavez — Kiodex, a developer of commodity-trading systems. SunGard Data Systems bought the start-up in 2004, and Mahajan went with it, rising over eight years with SunGard to president of its global trading business. In 2012 he became CEO of Allston Trading, a high frequency firm based in Chicago. When Goldman hired him and brought him back to New York in 2015, it described him in a memo as "bringing extensive experience in electronic trading, market structure, technology, and entrepreneurship to our rapidly growing electronic execution franchise. He will be responsible for delivering innovative electronic execution solutions to global clients across equity products worldwide."
 1. Richard Prager BlackRock  2. Chris Isaacson Bats Global Markets  3. Bradley Peterson Nasdaq  4. Brad Levy MarkitSERV  5. Dan Keegan Citi |
 6. Glenn Lesko Bloomberg Tradebook  7. Bryan Durkin CME Group  8. Mayur Kapani Intercontinental Exchange  9. Mike Blum KCG Holdings  10. Raj Mahajan Goldman Sachs Group |
 11. Ronald DePoalo Fidelity Institutional  12. Nick Themelis MarketAxess Holdings  13. Jenny Knott NEX Optimisation  14. Billy Hult Tradeweb Markets  15. Rob Park IEX Group |
 16. Bill Chow & Richard Leung Hong Kong Exchanges and Clearing  17. John Mackay (Mack) Gill MillenniumIT  18. Paul Hamill Citadel Securities  19. Eric Noll Convergex  20. Veronica Augustsson Cinnober Financial Technology |
 21. Tyler Moeller & Joshua Walsky Broadway Technology  22. Alasdair Haynes Aquis Exchange  23. Gaurav Suri Arcesium  24. Manoj Narang Mana Partners  25. Michael Chin & Neill Penney Thomson Reuters |
 26. Robert Sloan S3 Partners  27. Anton Katz & Stephen Mock AQR Capital Management  28. Donal Byrne Corvil  29. Stu Taylor Algomi  30. Alfred Eskandar Portware |
 31. Steven Randich Financial Industry Regulatory Authority  32. R. Cromwell Coulson OTC Markets Group  33. Peter Maragos Dash Financial  34. John Fawcett Quantopian  35. Donald Ross III PDQ Enterprises |
 36. Jennifer Nayar Vela Trading Technologies  37. Dan Raju Tradier  38. Susan Estes OpenDoor Trading  39. David Mercer LMAX Exchange  40. Oki Matsumoto Monex Group |