VP (Pres., Products Pipelines) Garthwaite Michael P. sold $50,400 worth of Class P Common Stock (1,550 units at $32.52) as part of a pre-agreed trading plan, converted options into 15,915 units of Class P Common Stock and covered exercise/tax liability with 4,145 units of Class P Common Stock, increasing direct ownership by 24% to 51,963 units (SEC Form 4) to satisfy withholding obligation