- California Engineering Company
 - Specialising in earthquake retrofitting, home inspection, concrete foundation, settlements, slides and drainage. - Dynamic Isolation Systems, Inc.
- Provides engineering products and services to improve the safety of buildings, bridges, and other structures to defend against earthquake damage.
- Earthquake and Structures, Inc.
- Provides structural engineering services for design and seismic retrofit of residential and commercial buildings and bridges.
- Earthquake Safety Systems, Inc.
- Manufactures non-structural seismic hazard mitigation equipment, including automatic lifeline, utilities, hazardous material, industrial process, and real-time structural monitoring.
- Ed Sylvis Construction
- Offering earthquake and seismic safety solutions such as foundation bolting, earthquake retrofitting, and sagging floor contracting.
- Kaslan Associates, Inc.
- Assess building design construction and seismic vulnerability, design quake- resistant retrofit to existing structures, and obtain earthquake insurance.
- Kinann Construction
- California state licenced general contractor specialising in earthquake/seismic upgrading, insurance inspections, dryrot repair, & remodels.
- Marr Shaffer & Miyamoto
- Specialising in seismic retrofit and design.
- Strand Earthquake Consultants
- Provide earthquake safety solutions including seismic gas shutoff valves, seismic switches, strong-motion recorders, accelerometers, and seismic monitoring of structures, including highrises and dams.
- Zokero
- Developers of SeisWare, a PC-based seismic interpretation system.
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