In 2004, Steinhardt came out of retirement to work for Index Development Partners, Inc., now known as WisdomTree Investments. He is chairman of WisdomTree, which offers dividend and earnings-based index funds rather than traditional index funds based on market capitalization. As of December 31, 2012, WisdomTree had $18.3 billion under management and is growing by 10% a month. During the fall of 2007 and 2008, WisdomTree's growth stagnated, as the stock market, especially the financial sector, in which WisdomTree's dividend-based funds are overweighted, tanked, as did WisdomTree's stock. However, in recent months, as the WisdomTree funds tended to outperform their "bogies," asset growth resumed its earlier pace and its stock price appreciated accordingly.