Here's a sampling of past and current clients:

AMBIT (Cadence) Anagram (Avanti/Synopsys), Apteq (Synopsys) Arithmatica (Forte) Artisan Components (ARM) Asset Management BA Jobs Concise Logic Cygnus Solutions (Red Hat) Dassault Systemes-Spatial Digital MediaCom (MathStar) Escalade (Mentor) Entridia Frequency Technology (Sequence/Apache) HarrisEDA InSilicon (Synopsys) Intel Kleiner Perkins Lucent Technologies MathStar Mentor Graphics PDF Solutions Rockwell Microelectronics (Conexent) Savantage Sematech Sente (Sequence) SiCAD, Silicon Metrics (Magma/Synopsys) SST Star Bridge Systems Sunrise Test Systems (ViewLogic/Synopsys) Synopsys Synplicity (Synopsys) Tech-X Tharas Systems (EVE) 3DSP VeriBest (Mentor Graphics) Verysys Xynetix (Avanti/Synopsys)