US private equity company Lion Point Capital has called on shale player Carrizo Oil & Gas to either sell or merge with another company in an attempt to boost shareholder value.

Lion Point, which holds a 6.3% stake in the company, said a merger could materially benefit shareholders by growing the size and scale of Carrizo’s Permian basin operations.

Carrizo is active in the southern Texas Eagle Ford shale play and in the Delaware sub-basin of the Permian.