Sept 5 (Reuters) - Liberty 77 Capital LP, a private equity firm set up by former U.S. Treasury Secretary Steve Mnuchin, has bought a 5.5% stake in Lions Gate Entertainment , according to a regulatory filing on Tuesday.

The buyout fund disclosed that it owns 4.5 million Class A shares of Lions Gate purchased for about $30.8 million.

Mnuchin has previously made investments in movies such as "Avatar", "Mad Max: Fury Road" and "Suicide Squad".

Liberty Strategic Capital, which manages Liberty 77 Capital LP, is focused on investing in technology, financial services, fintech companies and firms that are involved in creating new forms of content.

Lions Gate declined to comment, while Liberty Strategic Capital did not immediately respond to a request for comment. (Reporting by Jaiveer Singh Shekhawat in Bengaluru; Editing by Shailesh Kuber)