Jane Street Boss Says He Was Duped Into Funding AK-47s for Coup

The indictment reads like a cinematic plot: A Harvard Fellow and another activist allegedly wanted to buy AK-47s, Stinger missiles and grenades to topple South Sudan’s government. What they lacked was enough cash.

Now, Jane Street co-founder Robert Granieri concedes he put up the money — saying he was duped into funding the alleged coup plot. The role played by the wealthy recluse behind a Wall Street trading powerhouse emerges from the US prosecution of Peter Ajak, the Harvard Fellow who was accused last year of scheming to install himself atop the East African nation.

“Granieri is a longtime supporter ...