Kovner founded Caxton Corporation in 1983 of which he is Chairman. Caxton is described as "a diversified trading company and manager of hedge funds active in currency, interest rate, petroleum, commodity, and equity markets with over $10 billion in assets under management". 
In its 2003 profile Forbes stated he "invested in conservative daily New York Sun, where daughter Rachel now works as a reporter".  New York Magazine noted that he has also backed the Manhattan Institute.
Kovner is ranked by Forbes in 2004 as 106th on its list of the World's Richest People with $2.0 billion in assets.
A fan of the arts, he spent $2 million funding a fully illustrated edition of the bible and funded the new design of Lincoln Center. "Kovner is so downbeat, culturally," New York Magazine commented, "that you might say that he lives blue but thinks red."
His house features a lead-lined room to protect against chemical, biological, and nuclear weapons.
Kovner is also Chairman of the Juilliard School and founder and Chairman of the School Choice Scholarships Foundation.
- American Enterprise Institute, "Board of Trustees",
- "Forbes 400 Richest in America 2003", Forbes.com, 2004.
- "Bruce Kovner Forbes World's Richest People 2003", Forbes.com, 2003.
- SyntaPharma, "Board of Directors", 2004.
- Philip Weiss, "George Soros's Right-Wing Twin" (printer-friendly), New York Magazine, August 8, 2005.
- Andy Serwer, "The $11 Billion Man", Fortune, September 29, 2003.