The chandelier-filled ballroom was teeming with 200 men in tuxedos — and a smattering of women — whose daily decisions can collectively make or break the global financial markets. Most were picking over a lavish dinner that included rack of lamb and crème brûlée. Others were preparing to sing bawdy show tunes.

Kappa Beta Phi, an exclusive Wall Street fraternity whose members include big-name bankers, hedge fund billionaires and private equity titans, met at the St. Regis Hotel in Manhattan on Thursday night for its 80th annual black-tie dinner and induction ceremony.

As always, the event was held in strict secrecy, with members being told that “what happens at the St. Regis stays at the St. Regis.”

A reporter, however, was able to walk in unquestioned and observe the proceedings.