29 Series B energy investors in the US
We list 29 Series B energy investors in the US as of November 2026: 27 have an SEC filing on file and 2 were checked on the firm's own website or an official register, and the list was last checked on 6 Nov 2026. The cities with the most head offices on this list are San Francisco (4), New York (4) and Boston (2).
Top 5 Series B energy investors in the US, ranked by recent fund activity
Among firms with a published profile and a dated fund or deal in the last 24 months. The rule: Activity score out of 100: recency of the latest fund filing or dated deal (30: full marks within 3 months, then stepping down at 6, 12 and 24 months), share of the observed portfolio in this sector (20; half of that when the sector is stated only), stage focus (15: all of it when Series B is the only stage the firm states, split evenly when it states more), stated focus on the US (15: full marks when the firm names the US as where it invests, half when it says global), size of the fund on file on a log scale (12) and completeness of the public record (8). Stage and regional focus are our research, not an SEC figure. It is a measure of activity and fit, not of quality or returns. The same rule orders the whole list; it is repeated in the method box.
Energy Impact Partners
Type: VC firm · HQ: United States (London office) · Stages: Seed, Series A, Series B, Growth · Focus: Energy, Climate Tech, AI, Cybersecurity · Latest activity: Portfolio news, Nov 2026 · Fund size or assets: $4.5B (own site)
Portfolio news dated Nov 2026; $4.5B on file (own site); states energy as a focus; backs seed, Series A, Series B; names the US as where it invests; 8 named decision-makers on file.
Bison Ventures
Type: VC firm · HQ: San Francisco, CA · Stages: Pre-seed, Seed, Series A, Series B · Focus: Energy, AI, Healthtech, Biotech · Latest activity: New fund, Oct 2026 · Fund size on file: $160M (SEC Form D, 2025)
Latest fund filing dated Oct 2026; $160M fund on file (SEC Form D, 2025); states energy as a focus; backs pre-seed, seed, Series A; names the US as where it invests; 2 named decision-makers on file.
G2 Venture Partners
Type: VC firm · HQ: Portola Valley, CA · Stages: Series B, Growth · Focus: Energy, AI, Industrial Tech, Mobility · Latest activity: New deal, Aug 2026 · Fund size on file: $53M (SEC Form D, 2026)
Dated new deal in Aug 2026; $53M fund on file (SEC Form D, 2026); states energy as a focus; backs Series B, growth-stage; names the US as where it invests; 8 named decision-makers on file.
Massive VC
Type: VC firm · HQ: Boulder, CO · Stages: Seed, Series A, Series B · Focus: Energy, Space, AI, Cybersecurity · Latest activity: New fund, May 2026 · Fund size on file: $30M (SEC Form D, 2026)
Latest fund filing dated May 2026; $30M fund on file (SEC Form D, 2026); states energy as a focus; backs seed, Series A, Series B; names the US as where it invests; 3 named decision-makers on file.
Westly Capital Partners
Type: VC firm · HQ: Menlo Park, CA · Stages: Pre-seed, Seed, Series A, Series B, Growth · Focus: Energy, AI, Industrial Tech, Cybersecurity · Latest activity: New fund, May 2026 · Fund size on file: $500M (SEC Form D, 2026)
Latest fund filing dated May 2026; $500M fund on file (SEC Form D, 2026); states energy as a focus; backs pre-seed, seed, Series A; 8 named decision-makers on file.
First 14 of 29 Series B energy investors in the US
| Investor | Type | HQ | Stagesour research | Focusour research | Latest fund or deal | Fund sizeas filed or stated | Checked | Contacts |
|---|---|---|---|---|---|---|---|---|
| Energy Impact Partners | VC firm | United States (London office) | Seed, Series A, Series B, Growth | Energy, Climate Tech, AI, Cybersecurity | Portfolio news, Nov 2026 | $4.5B (own site) | 5 Nov 2026 | 8 names · Unlock |
| Bison Ventures | VC firm | San Francisco, CA | Pre-seed, Seed, Series A, Series B | Energy, AI, Healthtech, Biotech | New fund, Oct 2026 | $160M (SEC Form D, 2025) | 4 Nov 2026 | 2 names, firm email · Unlock |
| G2 Venture Partners | VC firm | Portola Valley, CA | Series B, Growth | Energy, AI, Industrial Tech, Mobility | New deal, Aug 2026 | $53M (SEC Form D, 2026) | 4 Nov 2026 | 8 names, firm email · Unlock |
| Massive VC | VC firm | Boulder, CO | Seed, Series A, Series B | Energy, Space, AI, Cybersecurity | New fund, May 2026 | $30M (SEC Form D, 2026) | 4 Nov 2026 | 3 names · Unlock |
| Westly Capital Partners | VC firm | Menlo Park, CA | Pre-seed, Seed, Series A, Series B, Growth | Energy, AI, Industrial Tech, Cybersecurity | New fund, May 2026 | $500M (SEC Form D, 2026) | 4 Nov 2026 | 8 names · Unlock |
| Energize Ventures | VC firm | Chicago, IL | Series A, Series B, Growth, Any stage | Energy, AI, Industrial Tech, Climate Tech | New deal, Sep 2026 | $328M (SEC Form D, 2020) | 5 Nov 2026 | 8 names · Unlock |
| Earthshot Ventures | VC firm | San Francisco, CA | Pre-seed, Seed, Series A, Series B | Energy, AI, Industrial Tech, Proptech | New fund, Oct 2026 | $77M (SEC Form D, 2026) | 4 Nov 2026 | 8 names, firm email · Unlock |
| Infinite | VC firm | West Palm Beach, FL | Pre-seed, Seed, Series A, Series B, Growth | Energy, AI, Deep Tech, Crypto and Web3 | New fund, Oct 2026 | $100M (SEC Form D, 2026) | 5 Nov 2026 | 6 names · Unlock |
| Cerberus Ventures | VC firm | New York, NY | Pre-seed, Seed, Series A, Series B | Energy, AI, Industrial Tech, Quantum | New fund, Jun 2026 | $75M (SEC Form D, 2024) | 4 Nov 2026 | 8 names · Unlock |
| Overlap Holdings | VC firm | Hicksville, NY | Seed, Series A, Series B | Energy, AI, Climate Tech, Healthtech | New fund, Oct 2026 | $16M (SEC Form D, 2023) | 4 Nov 2026 | 8 names · Unlock |
| SV Angel | VC firm | San Francisco, CA | Seed, Series B, Growth | Energy, AI, Consumer, Crypto and Web3 | New fund, Jun 2026 | $575M (SEC Form D, 2025) | 4 Nov 2026 | 8 names · Unlock |
| B Capital | VC firm | Manhattan Beach, CA | Seed, Series A, Series B, Growth | Energy, AI, Fintech, Healthtech | New fund, Jul 2025 | $307M (SEC Form D, 2023) | 4 Nov 2026 | 8 names, firm email · Unlock |
| Isogon Ventures | VC firm | New York, NY | Seed, Series A, Series B | Energy, AI, Logistics, Industrial Tech | New deal, Jul 2026 | $150M (SEC Form D, 2026) | 4 Nov 2026 | 7 names · Unlock |
| HG Ventures | Corporate VC | Indianapolis, IN | Seed, Series A, Series B, Growth | Energy, Industrial Tech, AI, Proptech | Portfolio news, Apr 2026 | 4 Nov 2026 | 8 names · Unlock |
You are seeing 14 of 29. The full list adds 15 more investors and 181 named decision-makers.
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How these 29 break down
By US state
| US state | On this list | Share |
|---|---|---|
| California | 8 | 28% |
| New York | 5 | 17% |
| Illinois | 2 | 7% |
| Florida | 2 | 7% |
| Massachusetts | 2 | 7% |
By type
| Type | On this list | Share |
|---|---|---|
| VC firm | 28 | 97% |
| Corporate VC | 1 | 3% |
Method and limits
- Source
- 27 of the 29 rows carry an SEC filing (Form D or Form ADV). All 29 have a website we checked. Filing date and fund size are SEC data where a filing exists. Stage, sector and check size are our research.
- Inclusion rule
- Organizations that back startups. Individuals, buyout funds and firms we found to be inactive are left out. Sector: the firm states energy as a focus on its own site, or we observed it in the firm's portfolio. Stage: the firm states that it invests at Series B.
- Order
- Firms with a published profile come first. Activity score out of 100: recency of the latest fund filing or dated deal (30: full marks within 3 months, then stepping down at 6, 12 and 24 months), share of the observed portfolio in this sector (20; half of that when the sector is stated only), stage focus (15: all of it when Series B is the only stage the firm states, split evenly when it states more), stated focus on the US (15: full marks when the firm names the US as where it invests, half when it says global), size of the fund on file on a log scale (12) and completeness of the public record (8). Stage and regional focus are our research, not an SEC figure. It is a measure of activity and fit, not of quality or returns.
- Last refreshed
- November 2026. Rows on this list were checked between 4 Nov 2026 and 6 Nov 2026.
- Fill rates
- Of 29 rows: stage 29, sector 29, fund size 26, website 29. In the paid file: named decision-makers on 28 rows, firm email on 12, LinkedIn page on 21, check size on 4.
- Corrections
- Email hello@theinvestordatabase.com or use the update form. We act within 5 working days.
Questions
How many Series B energy investors in the US are there?
We list 29 as of November 2026. 19 of the 29 have a fund filing or a dated deal in the last 12 months. The cities with the most are San Francisco (4), New York (4) and Boston (2).
Which Series B energy investors in the US raised a new fund in the last 12 months?
15 of the 29 have a fund filing dated in the last 12 months. The most recent on this list are Bison Ventures (Oct 2026), Overlap Holdings (Oct 2026) and Earthshot Ventures (Oct 2026).
What is the typical fund size of Series B energy investors in the US?
The median fund size on file for this list is $111M, across the 22 firms with a size on an SEC Form D. The fund on file is each firm's main fund, which is not always its newest. The other 7 do not disclose a size there.
How do I contact Series B energy investors in the US?
The paid file holds 181 named decision-makers across 28 of these 29 and a firm email for 12. We publish the address a firm lists itself, never a personal email. Each free row links to a profile with the firm's website.
Where does the data on Series B energy investors in the US come from?
27 of the 29 rows have an SEC filing on file (Form D or Form ADV) and 2 were checked on the firm's own website or an official register. Filing date and fund size come from the filing. Stage, sector and check size are our research. Rows on this list were last checked on 6 Nov 2026 at the latest. The whole file is re-verified twice a year.
Broader lists
Energy venture capital firms in the US (249)Series B investors in the US (165)Series B energy investors (55)
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