Big Companies/Component Vendors

Arianespace

Ball

Boeing Delta

Cincinnati Electronics

Chomerics
Makers of thermal adhesives and pads for getting heat from integrated circuits to the circuit board or a thermal strap.  Don't leave Earth without it.   (But do check the GSFC outgassing database to be sure you use it correctly for your application!)
web: http://www.parker.com/chomerics/ 

Composite Optics

Lincoln Composites

Litton

Lockheed Martin

Maxwell Technologies, Microelectronics (formerly Space Electronics)
We design and manufacture radiation-shielded integrated circuits, power modules and single board computers for the space and military markets. Our proprietary shielding technology allows our original equipment manufacturer customers to use powerful, low-cost, off-the-shelf components, protected with the level of radiation shielding required for the orbit or environment in which satellites or spacecraft are to be deployed.

9244 Balboa Avenue
San Diego, CA 92123
Phone:  (858) 503-3300
Fax: (858) 503-3301
E-mail: microelectronics@maxwell.com 
Web: http://www.maxwell.com/microelectronics/index.html 

Moog

Motorola

Orbital Sciences Corporation

Primex

Satellite Power Corp.

Starsys

Terma

Thiokol