Occidental Petroleum said Sept. 18 it will sell its stake in Houston-based Plains All American Pipeline. Oxy Holding Co. is selling 14.98 million common units of PAA for $21.46 per unit and expects to receive $321.4 million. Oxy also is selling its stake in Plains GP Holdings for a reported $330.8 million (15 million Class A shares at $22.05 each).