Plains Exploration & Production Co $0 Plains All American Pipeline LP $27,273,453 Ngl Energy Partners Lp $284,000 Plains Gp Holdings Lp $4,918,697 Tallgrass Energy Gp, Lp $9,647,361 Plains Exploration & Production Co $0 Plains All American Pipeline LP $27,273,453 Ngl Energy Partners Lp $284,000 Plains Gp Holdings Lp $4,918,697 Tallgrass Energy Gp, Lp $9,647,361