Products
- Paterson & Ramapo Rail Road Company
- Paterson Central Improvement Company
- Paterson Central Improvement Company
- Paterson Extension Rail Road Company (Signed by U.S. Vice President Garret Hobart)
- Pathe Film Corporation
- Patino Mines & Enterprises Consolidated Incorporated
- Paul Revere Fire Insurance Company
- Paul Revere Investors Inc.
- Pawling Savings Bank (New York)
- Pay-As-You-Enter Car Corporation
- Peabody Coal Company
- Pearl Consolidated Mining Company
- Pearson Publishing Company
- Pecksport Connecting Railway Company
- Peekskill Lighting and Railroad Company
- Peel-Elder Limited
- Peerless Drug Company
- Peerless Motor Car Corporation
- Peerless Truck and Motor Corporation
- Pekin, Lincoln and Decatur Railway Company
- Pelican Gas Products, Inc.
- Penn Central Company
- Penn Central Company
- Penn Central Corporation
- Penn Seaboard Steel Corporation
- Penn Yan & New York Railway Company
- Penn Yan Mining Company
- Pennsalt Chemicals Corporation
- Pennsylvania Company
- Pennsylvania Company
- Pennsylvania Electric Company
- Pennsylvania Gas and Water Company
- Pennsylvania Gasoline Company
- Pennsylvania Gasoline Company
- Pennsylvania New York Central Transportation Company
- Pennsylvania Petroleum Company
- Pennsylvania Power Company
- Pennsylvania Railroad Company
- Pennsylvania Railroad Company
- Pennsylvania Railroad Company
- Pennsylvania Railroad Company (Horseshoe Curve)
- Pennsylvania Salt Manufacturing Company
- Pennsylvania Salt Manufacturing Company
- Pennsylvania Tunnel and Terminal Railroad Company
- Pennsylvania, Poughkeepsie and Boston Railroad Company
- Pennsylvania, Poughkeepsie and Boston Railroad Company
- Pennsylvania, Slatington and New England Railroad Company
- Pennsylvania-Ohio Electric Company
- Pennsylvania-Ontario Transportation Company
- Pennzoil United, Inc.
- Penobscot & Kennebec Railroad Company
- Penobscot Central Railway Company (Signed by Flavius O. Beal)
- People's Passenger Railway Company of Philadelphia
- People's Passenger Railway Company of Philadelphia
- Peoples Light and Power Corporation
- Peoples Railway Company of Dayton, Ohio
- Peoples Theatre Company
- Peoples Traction Company of Philadelphia
- Peoples-First National Bank of Hoosick Falls
- Peoria & Bureau Valley Railroad Company
- Peoria and Eastern Railway Company
- Peoria and Eastern Railway Company
- Peoria Railway Terminal Company
- Peoria, Decatur & Evansville Railway Company
- Peoria, Decatur & Evansville Railway Company
- Peoria, Decatur and Mattoon Railroad Company (Signed by Stuyvesant Fish)
- Pepsi-Cola Puerto Rico Bottling Company
- Pepsi-Cola United Bottlers, Inc.
- PepsiCo, Inc.
- Pere Marquette Transportation Company
- Perfect Film & Chemical Corporation
- Perfect Photo, Inc.
- Perfection Tire & Rubber Co.
- Perkin-Elmer Corporation
- Perth Amboy and Woodbridge Rail Road Company
- Pet Incorporated
- Pet Milk Company
- Petaca Mining Corporation (Owned by Monks)
- Peter Paul, Inc.
- Peterborough Railroad
- Petroleum and Trading Corporation
- Petroleum Finance & Development Company of America
- Pettijohn Company
- Pettijohn Pure Products Co.
- Phelps Dodge Corporation
- Philadelphia & Gray's Ferry Passenger Railway Company
- Philadelphia & Gray's Ferry Passenger Railway Company
- Philadelphia and Garrettford Street Railway Company
- Philadelphia and Gulf Steamship Company
- Philadelphia and Reading Railroad Company
- Philadelphia and Reading Railroad Company
- Philadelphia and Trenton Railroad Company
- Philadelphia Bake-Rite Company
- Philadelphia Bourse
- Philadelphia Bourse
- Philadelphia City Passenger Railway Company
- Philadelphia City Passenger Railway Company
- Philadelphia City Passenger Railway Company
- Philadelphia City Passenger Railway Company
- Philadelphia Company