Vaquero Capital

Enterno | Quorum

PDS Energy | Oildex

Tolteq & National Oilwell Varco NOV

Irth Solutions Bregal Sagemount [Recap]

Allegro and Vector Capital – majority recap

Oildex Accel KKR

Stone Energy

Pennz Energy & devon

Northern Border Pipeline Company

Midcoast Energy Resources

Hugoton Energy Corporation & Chesapeake Energy

Horizon Offshore

GTSolar International

GeoScience Corp & CGGVerita

ForestOil Corporation

DLB Group & Chesapeake Energy

Chieftain International

Bayard Drilling Technologies

DrillingInfo & Insight Venture Partners

Drillinginfo & Transform Software

Drillinginfo & Wasatch – Croskreek