The Chicago Board Options Exchange could not have become a top trading venue known for its Volatility Index and S&P 500 products without world-class technology. But when its parent, CBOE Holdings, completed the $3.4 billion acquisition of Bats Global Markets in February, the company was lifted into another league. CBOE says now it's not only No. 1 in options volume, but it also has the largest share of pan-European equities trading, ranks No. 2 in the U.S. stock exchange business, and has a significant presence in exchange-traded funds and in foreign exchange with its Hotspot business. "With Bats, CBOE leapfrogs the competition in its ability to deliver product at a faster pace," says CBOE Holdings president and chief operating officer Chris Concannon, who was previously chief executive officer of Bats. Before that, he was COO of Virtu Financial and head of transaction services at Nasdaq. Concannon, 49, is now No. 2 at CBOE, reporting to chair and CEO Edward Tilly.
 1. Adena Friedman NASDAQ  2. Catherine Bessant Bank of America Corp.  3. Robert Goldstein BlackRock  4. Jeffrey Sprecher Intercontinental Exchange  5. Lance Uggla IHS Markit |
 6. Shawn Edwards & Vlad Kliatchko Bloomberg  7. David Craig Thomson Reuters  8. Michael Spencer NEX Group  9. Don Callahan Citigroup  10. Elisha Wiesel Goldman Sachs Group |
 11. Michael Bodson Depository Trust & Clearing Corp.  12. Terrence Duffy CME Group  13. Charles Li Hong Kong Exchanges and Clearing  14. Sean Belka Fidelity Investments  15. Chris Concannon CBOE Holdings |
 16. Guy Chiarello First Data Corp.  17. Steven Lieblich Citadel  18. David Rutter R3CEV  19. Blythe Masters Digital Asset Holdings  20. Alfred Spector Two Sigma Investments |
 21. Neil Katz D.E. Shaw Group  22. Lee Olesky Tradeweb Markets  23. Richard McVey MarketAxess Holdings  24. David Gledhill DBS Bank  25. Seth Merrin Liquidnet Holdings |
 26. Antoine Shagoury State Street Corp.  27. Peter Brown & Robert Mercer Renaissance Technologies  28. Lou Eccleston TMX Group  29. Peter Cherecwich Northern Trust Corp.  30. Mike Chinn S&P Global Market Intelligence |
 31. Chris Corrado London Stock Exchange Group  32. Neal Pawar AQR Capital Management  33. Gary Norcross Fidelity National Information Services  34. Steven O'Hanlon Numerix  35. Sebastián Ceria Axioma |
 36. Brian Conlon First Derivatives and Kx Systems  37. Tyler Kim MaplesFS  38. Michael Cooper BT Radianz  39. Robert Schifellite Broadridge Financial Solutions  40. Jim Minnick eVestment |