The Abu Dhabi Investment Authority is preparing to sell around $2 billion of its stakes in private-equity funds, amid an increasing push toward direct investments by the sovereign wealth fund, people familiar with the matter said.

ADIA is working with advisers at PJT Park Hill on the proposed transaction, according to the people, who asked not to be identified because the information is private. It plans to start marketing the deal to potential buyers within weeks, one of the people said.

Large investors like ADIA often end up with a multitude of investments run by different private-equity managers, making them cumbersome to administer. The Gulf fund is following other major investors by taking direct stakes in firms -- eschewing the fees and limitations of managed funds -- to generate returns in a low-interest-rate environment.

Final details about the sale, including the portfolio size, could still change, they said.

Representatives for ADIA and PJT Park Hill declined to comment. Secondaries Investor reported in September that ADIA was considering selling an unspecified amount of private equity fund stakes, citing unidentified people.

While ADIA doesn’t divulge its assets under management, it’s estimated to have about $696 billion. That makes it the third-largest in the world, according to data from the Sovereign Wealth Fund Institute.

The fund last year said it planned to hire, mostly for investment and research-focused roles in its fixed income and treasury department, to boost active management. ADIA raised its actively managed investments to 55% of its portfolio in 2018, up from 50% the previous year.

It has become easier to sell private-equity portfolios in the secondary market, with firms such as London-based Coller Capital Ltd. raising money to trade these types of investments. An early exit from a fund gives investors a chance to cash in before the original lock-up expiry date, while buyers see upside by taking stakes in companies they expect will keep growing.

Last year, ADIA was part of a consortium that bought Nestle SA’s $10 billion skincare business. It partnered with private equity firms Advent International and Cinven Ltd. to make a joint bid for Thyssenkrupp AG’s 15 billion-euro ($17 billion) elevator unit, Bloomberg News has reported.

ADIA also teamed up with Cinven in its purchase of British scientific measurement and testing company LGC Group, people familiar with the matter have said. In July, the sovereign wealth fund agreed to buy a stake in Domestic & General Group Ltd., the U.K. appliance warranty provider owned by CVC Capital Partners.