Private equity (PE) firm Kimmeridge Energy Management Co. LLC said Wednesday it has closed its fifth upstream-focused fund after raising $800 million.

Kimmeridge said the fund is twice the size of its fourth, which was raised in 2017, and it attracted the support of endowments, foundations, family offices and sovereign wealth funds. The fifth fund brings Kimmeridge’s total raise to $2.8 billion since it was founded in 2012 to make direct investments in unconventional U.S. oil and natural gas assets, including in the exploration and production (E&P) sector.

Investors have largely soured on the industry, but PE has continued to pump money into the space, backing a number of startups this year alone. A unit of Warburg Pincus LLC on Tuesday announced a $1 billion deal to take Roan Resources Inc. private.

“We believe that the current E&P landscape presents a host of compelling investment opportunities at attractive entry points,” said Kimmeridge founder Ben Dell.

Kimmeridge’s investments have included PDC Energy Inc. and Resolute Energy Corp., now part of Cimarex Energy Co. Most recently, the firm teamed up with Desert Royalty Co. LLC in July to form Desert Peak Minerals, which is focused on the Permian Basin’s Delaware sub-basin. The firm’s fifth fund will continue its strategy of acquiring and developing unconventional assets.