12. Boaz Weinstein
40u40 main boaz weinstein
Age: 39

Founder, Saba Capital Management

A longtime Wall Street star, Weinstein gained Main Street fame when he harpooned the London Whale, a.k.a. J.P. Morgan's Bruno Iksil, whose disastrous derivatives trades resulted in billions in losses for the ill-starred trader's employer -- and put the hedge fund manager at the center of the J.P. Morgan saga. The performance of the $5.5 billion Saba's flagship fund is ho-hum this year, but Weinstein doesn't seem fazed: He just plunked down $25.5 million to buy the four-bedroom apartment on Fifth Avenue that had belonged to the reclusive copper heiress Huguette Clark. And he gave $1 million to New York City's Stuyvesant High School, his alma mater, to fund a library renovation.

Ka-ching: Weinstein reportedly earned $90 million in 2011.

--K.B.


  @FortuneMagazine - Last updated October 17 2012 05:11 PM ET
Join the Conversation
The job creators

Organizations headed by some of these top young minds in business have grown this past year, many of them hiring at an impressive rate. Here are seven examples.

Market indexes are shown in real time, except for the DJIA, which is delayed by two minutes. All times are ET. Disclaimer LIBOR Warning: Neither BBA Enterprises Limited, nor the BBA LIBOR Contributor Banks, nor Reuters, can be held liable for any irregularity or inaccuracy of BBA LIBOR. Disclaimer. Morningstar: © 2014 Morningstar, Inc. All Rights Reserved. Disclaimer The Dow Jones IndexesSM are proprietary to and distributed by Dow Jones & Company, Inc. and have been licensed for use. All content of the Dow Jones IndexesSM © 2014 is proprietary to Dow Jones & Company, Inc. Chicago Mercantile Association. The market data is the property of Chicago Mercantile Exchange Inc. and its licensors. All rights reserved. FactSet Research Systems Inc. 2014. All rights reserved. Most stock quote data provided by BATS.