The following is an incomplete list of notable integrated circuit (i.e. microchip) manufacturers. Some are in business, and others are defunct.
A
Agere Systems (now part of LSI Logic formerly part of Lucent, which was formerly part of AT&T)
Agilent Technologies (formerly part of Hewlett-Packard, spun off in 1999)
Alcatel
Altera
AMD (Advanced Micro Devices; founded by ex-Fairchild employees)
Analog Devices
Applied Materials
ATI Technologies (Array Technologies Incorporated; acquired parts of Tseng Labs in 1997; in 2006, became a wholly owned subsidiary of AMD)
Atmel (co-founded by ex-Intel employee)
austriamicrosystems AG
B
Broadcom
Commodore Semiconductor Group (formerly MOS Technology)
C
Cymbet Corporation
Cypress Semiconductor
F
Fairchild Semiconductor (founded by ex-Shockley Semiconductor employees: the "Traitorous Eight")
Freescale Semiconductor (formerly part of Motorola)
Fujitsu
G
Genesis Microchip
GMT Microelectronics (formerly Commodore Semiconductor Group)
H
Hitachi, Ltd.
Horizon Semiconductors
I
IBM (International Business Machines)
Infineon Technologies (formerly part of Siemens)
Integrated Device Technology
Integrated Silicon Solution Inc
Intel (founded by ex-Fairchild employees)
Intersil (formerly Harris Semiconductor)
J
Jennic Limited
L
Lattice Semiconductor
Linear Technology
LSI Logic (founded by ex-Fairchild employees)
LSI Computer Sysyems, Inc. (founded by ex-General Instrument employees)
M
Maxim Integrated Products
Marvell Technology Group
Microchip Technology Manufacturer of the PIC microcontrollers
MicroSystems International
MOS Technology (founded by ex-Motorola employees)
Mostek (founded by ex-Texas Instruments employees)
N
National Semiconductor (aka "NatSemi"; founded by ex-Fairchild employees)
Nordic Semiconductor (formerly known as Nordic VLSI)
Nvidia (acquired IP of competitor 3dfx in 2000; 3dfx was co-founded by ex-SGI employee)
NXP Semiconductors (formerly part of Philips)
O
ON Semiconductor (formerly part of Motorola)
P
Parallax Inc.Manufacturer of the BASIC Stamp and Propeller Microcontrollers
PMC-Sierra (from the former Pacific Microelectronics Centre and Sierra Semiconductor, the latter co-founded by ex-NatSemi employee)
R
Renesas Technology (joint venture of Hitachi and Mitsubishi Electric)
Rohm
S
Samsung Electronics (Semiconductor division)
STMicroelectronics (formerly SGS Thomson)
T
Texas Instruments
Toshiba
TranSwitch
TSMC (Taiwan Semiconductor Manufacturing Company. semiconductor foundry)
U
u-blox (Fabless GPS semiconductor provider)
V
VIA Technologies (founded by ex-Intel employee) (part of Formosa Plastics Group)
Volterra Semiconductor
X
Xilinx (founded by ex-ZiLOG employee)
Z
ZiLOG (founded by ex-Intel employees) (part of Exxon 1980–89; now owned by TPG)
