- Pacific Resistor Company
- Pacific Monolithics, Inc.
- Packard-Hughes
- PacTec
- Paktron
- Panasonic
- Panasonic Semiconductor Development Co.
- Panduit
- Panel Components Corp.
- Paneltec
- Paradigm Technology, Inc.
- Para-Line Transformers
- Parallax, Inc.
- Pascall Electronics Ltd.
- PCA Electronics
- PCD, Inc.
- PD-LD, Inc.
- Penn Engineering & Manufacturing (PEM)
- Penn Engineering Components
- Peregrine Semiconductor Corp.
- Performance Motion Devices Corp. (PMD)
- Pericom Semiconductor
- Phihong
- Philips Passive Components
- Philips Semiconductor
- Philips ECG
- Phoenix Contact
- Phylon Communications
- Piconics, Inc.
- Piezo Crystal
- Piezo Technology
- Planar Systems, Inc.
- Pletronics, Inc.
- PLX Technology, Inc.
- PMC-Sierra
- Point Source
- Pole/Zero Corp.
- PolyCase Products
- Polyfet RF Devices
- PolyStor Corp.
- Positronic Industries, Inc.
- Potter Production Corp.
- Power Convertibles Corp.
- Power Dynamics, Inc.
- Power General
- Power Integrations
- Power-One
- Power Solutions
- Power-Sonic
- PowerTech
- Power Trends
- Powertronix Corp.
- Precision Resistive Products
- Precision Resistor Co., Inc.
- Preh
- Prem Magnetics
- Projects Unlimited
- Promptus Electronic Hardware
- ProTek Devices
- PSC Computer Products
- P-tec Corp.
- Pulizzi Engineering
- Pulse Engineering
