NEW YORK, Nov 29 (Reuters) - Jeff Ubben, one of Wall Street's most prominent activist investors, is shutting down Inclusive Capital Partners, a new firm designed to focus on social investing, three years after starting it.

The Wall Street Journal reported on Wednesday that the firm is winding down its funds and is returning capital to investors, citing a memo.

Ubben and Inclusive Capital did not respond to calls and emails for comment.

The news comes as it has become increasingly difficult for hedge funds to raise new cash and as a number of prominent investors have been wrong-footed by markets gyrating on speculation about interest rate moves, fears about inflation and geopolitical turmoil. Last year more hedge funds closed their doors than launched, data from Hedge Fund Research show.

More than two decades ago, Ubben, 61, who started his career at mutual fund giant Fidelity, founded ValueAct Capital in San Francisco. Since 2000 he established himself and the firm as a powerful but friendly investor more interested in working behind the scenes with target companies than pushing for change in public on television or at conferences.

ValueAct, which invested as much as $20 billion over the years, took stakes in companies ranging from Microsoft to Martha Stewart Living Omnimedia, and a handful of its top executives, including Ubben, sat on numerous corporate boards.

After having spent years planning for an orderly succession at ValueAct and at an age many investors might think of retiring, Ubben launched his second act with Inclusive Capital, known as InCap, in 2020.

The firm was designed as an environmental and social impact investment firm that would invest in companies whose businesses address societal needs. At the time he said pushing companies to address environmental and social issues can have big payoffs and the firm was trying to raise as much as $10 billion.

In 2021, InCap invested in Exxon and Ubben joined the board as the oil company was facing a board challenge from startup hedge fund Engine No. 1. Investors voted to replace three directors with Engine No. 1 candidates but Ubben kept his seat.

In a regulatory filing, InCap said on Wednesday it is selling two million shares in Exxon worth $216 million, suggesting the firm was making big changes to its portfolio.

Despite Ubben's strong reputation, however, people familiar with the InCap's fund raising efforts said it has been tough to raise cash and noted that investor tastes, especially when it came to environmental, social and governance issues (ESG), have shifted. With markets tumbling last year, many investors simply wanted to see returns instead of focusing on ESG issues.

Additionally returns at InCap have been poor, people familiar with the portfolio said.

Some of the firm's biggest investments, including specialty chemicals company Ingevity, Bio Rad Laboratories , Unifi Inc which manufactures and sells recycled products, wood pellets maker Enviva and German pharmaceutical and biotech Bayer are nursing double digit losses this year. (Reporting by Svea Herbst-Bayliss; Additional reporting by Sabrina Valle in Houston; Editing by Josie Kao)