Tanarra Capital, the activist investment firm run by former Credit Suisse boss John Wylie, has acquired shares in Nine Entertainment after a difficult year for the publishing and broadcast giant.

Mr Wylie established Tanarra in 2016 after leaving Lazard, another investment bank where he was managing director. Tanarra has since taken significant stakes in some of the biggest companies on the ASX including Lendlease, Telstra, Tabcorp and Ampol.