Registered entities
Mainspring Energy, Inc.
Reg. No. 20231478002United States
Etagen Inc
Reg. No. 272430529United States
Mainspring
Reg. No. 40103832196Latvia
Social engagement
Social engagement: 77.9K social following, 10 posts in the last 12 months — below the industry typical range.
Investor mix
32 investors on record; lead investors include Khosla Ventures, American Electric Power, Equinor, Lightrock.
| Investor type | Count | Share |
|---|---|---|
| Venture capital | 9 | 28% |
| Private equity | 4 | 13% |
| Bank & private debt | 2 | 6% |
| Other / undisclosed | 17 | 53% |
Hiring activity
Hires occasionally
1 role tracked across 1 of the last 12 months
3 Dec 2025 · Staff Mechanical Engineer - Structures Design · Menlo Park
19 Sep 2025 · Marketing Operations Specialist · Menlo Park
18 Sep 2025 · Market Strategy Manager · Menlo Park
18 Sep 2025 · Data Center Business Development Director · Menlo Park
17 Sep 2025 · Director, Marketing Communications · Menlo Park
Based on job postings tracked across public sources.
Recent activity
26 Jun 2026
Event
APPA National Conference 2026
10 Jun 2026
Leadership hire
CEO
2 Jun 2026
Event
Xendee University Week 2026 virtual event