Qatar Investment Authority has acquired a “significant” stake in Oryx, a midstream crude operator in the Permian Basin, from Stonepeak Infrastructure Partners. QIA’s investment is about $550 million. White & Case LLP served as legal adviser to QIA on the transaction while Sidley Austin LLP did likewise for Stonepeak. MIDLAND, Texas, Aug. 7, 2019 /PRNewswire/ — Oryx Midstream Services (Oryx), the largest privately-held midstream crude operator in the Permian Basin, announced today that an affiliate of Qatar Investment Authority (QIA) has acquired a significant stake in Oryx from an affiliate of Stonepeak Infrastructure Partners (Stonepeak).