37 Series B cybersecurity investors in the US
We list 37 Series B cybersecurity investors in the US as of November 2026: 35 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 7 Nov 2026. The cities with the most head offices on this list are New York (6), Palo Alto (3) and San Francisco (2).
Top 5 Series B cybersecurity 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.
Alpha Partners
Type: VC firm · HQ: New York, NY · Stages: Series B, Growth · Focus: Cybersecurity, AI, Developer Tools, Healthtech · Latest activity: New fund, Oct 2026 · Fund size on file: $200M (SEC Form D, 2024)
Latest fund filing dated Oct 2026; $200M fund on file (SEC Form D, 2024); states cybersecurity as a focus; backs Series B, growth-stage; names the US as where it invests; 8 named decision-makers on file.
Energy Impact Partners
Type: VC firm · HQ: United States (London office) · Stages: Seed, Series A, Series B, Growth · Focus: Cybersecurity, Energy, Climate Tech, AI · 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 cybersecurity as a focus; backs seed, Series A, Series B; names the US as where it invests; 8 named decision-makers on file.
Tribe Capital
Type: VC firm · HQ: San Mateo, CA · Stages: Seed, Series A, Series B, Growth · Focus: Cybersecurity, AI, Crypto and Web3, Generalist · Latest activity: New fund, Oct 2026 · Fund size on file: $500M (SEC Form D, 2021)
Latest fund filing dated Oct 2026; $500M fund on file (SEC Form D, 2021); states cybersecurity as a focus; backs seed, Series A, Series B; names the US as where it invests; 8 named decision-makers on file.
Translink Capital
Type: VC firm · HQ: Palo Alto, CA · Stages: Seed, Series A, Series B · Focus: Cybersecurity, AI, Developer Tools, Mobility · Latest activity: New fund, Sep 2026 · Fund size on file: $174M (SEC Form D, 2021)
Latest fund filing dated Sep 2026; $174M fund on file (SEC Form D, 2021); states cybersecurity as a focus; backs seed, Series A, Series B; names the US as where it invests; 8 named decision-makers on file.
Madrona
Type: VC firm · HQ: Seattle, WA · Stages: Pre-seed, Seed, Series A, Series B, Growth · Focus: Cybersecurity, AI, Biotech, Consumer · Latest activity: New deal, Oct 2026 · Fund size on file: $490M (SEC Form D, 2025)
Dated new deal in Oct 2026; $490M fund on file (SEC Form D, 2025); states cybersecurity as a focus; backs pre-seed, seed, Series A; names the US as where it invests; 8 named decision-makers on file.
First 18 of 37 Series B cybersecurity investors in the US
| Investor | Type | HQ | Stagesour research | Focusour research | Latest fund or deal | Fund sizeas filed or stated | Checked | Contacts |
|---|---|---|---|---|---|---|---|---|
| Alpha Partners | VC firm | New York, NY | Series B, Growth | Cybersecurity, AI, Developer Tools, Healthtech | New fund, Oct 2026 | $200M (SEC Form D, 2024) | 4 Nov 2026 | 8 names, firm email · Unlock |
| Energy Impact Partners | VC firm | United States (London office) | Seed, Series A, Series B, Growth | Cybersecurity, Energy, Climate Tech, AI | Portfolio news, Nov 2026 | $4.5B (own site) | 5 Nov 2026 | 8 names · Unlock |
| Tribe Capital | VC firm | San Mateo, CA | Seed, Series A, Series B, Growth | Cybersecurity, AI, Crypto and Web3, Generalist | New fund, Oct 2026 | $500M (SEC Form D, 2021) | 4 Nov 2026 | 8 names, firm email · Unlock |
| Translink Capital | VC firm | Palo Alto, CA | Seed, Series A, Series B | Cybersecurity, AI, Developer Tools, Mobility | New fund, Sep 2026 | $174M (SEC Form D, 2021) | 5 Nov 2026 | 8 names, firm email · Unlock |
| Madrona | VC firm | Seattle, WA | Pre-seed, Seed, Series A, Series B, Growth | Cybersecurity, AI, Biotech, Consumer | New deal, Oct 2026 | $490M (SEC Form D, 2025) | 5 Nov 2026 | 8 names · Unlock |
| Evolution | VC firm | New York, NY | Seed, Series A, Series B, Growth | Cybersecurity, AI, Developer Tools, SaaS | New fund, Sep 2026 | $1.2B (SEC Form D, 2026) | 4 Nov 2026 | 8 names · Unlock |
| Ansa | VC firm | New York, NY | Series A, Series B, Growth | Cybersecurity, AI, Healthtech, Media | New fund, May 2026 | $200M (SEC Form D, 2026) | 4 Nov 2026 | 4 names, firm email · Unlock |
| FLF Accelerate | VC firm | Tampa, FL | Pre-seed, Seed, Series A, Series B | Cybersecurity, AI, Fintech, Media | New fund, Sep 2026 | $5M (SEC Form D, 2026) | 4 Nov 2026 | 8 names · Unlock |
| SignalFire | VC firm | San Francisco, CA | Seed, Series A, Series B, Growth | Cybersecurity, AI, Healthtech, Developer Tools | New fund, May 2026 | $357M (SEC Form D, 2021) | 4 Nov 2026 | 8 names · Unlock |
| Massive VC | VC firm | Boulder, CO | Seed, Series A, Series B | Cybersecurity, Space, AI, Energy | New fund, May 2026 | $30M (SEC Form D, 2026) | 4 Nov 2026 | 3 names · Unlock |
| SYN Ventures | VC firm | West Palm Beach, FL | Seed, Series A, Series B | Cybersecurity, AI, Defense Tech, Industrial Tech | New fund, Oct 2026 | $300M (SEC Form D, 2022) | 4 Nov 2026 | 8 names · Unlock |
| Menlo Ventures | VC firm | Menlo Park, CA | Pre-seed, Seed, Series A, Series B, Growth | Cybersecurity, AI, Media, Robotics | New fund, Sep 2026 | $800M (SEC Form D, 2025) | 4 Nov 2026 | 8 names · Unlock |
| Westly Capital Partners | VC firm | Menlo Park, CA | Pre-seed, Seed, Series A, Series B, Growth | Cybersecurity, AI, Energy, Industrial Tech | New fund, May 2026 | $500M (SEC Form D, 2026) | 4 Nov 2026 | 8 names · Unlock |
| Dallas Venture Capital I DVC | VC firm | Irving, TX | Seed, Series A, Series B | Cybersecurity, AI, Fintech, Data | New deal, Oct 2026 | $75M (SEC Form D, 2021) | 5 Nov 2026 | 8 names, firm email · Unlock |
| Greenfield Partners | VC firm | New York, NY | Series A, Series B, Growth | Cybersecurity, AI, Deep Tech, Fintech | New fund, Jul 2026 | 4 Nov 2026 | 8 names · Unlock | |
| Variant | VC firm | New York, NY | Pre-seed, Seed, Series A, Series B, Growth | Cybersecurity, Fintech, AI, Crypto and Web3 | New fund, Sep 2026 | $250M (SEC Form D, 2025) | 4 Nov 2026 | 8 names · Unlock |
| Atlas Ventures | VC firm | Chicago, IL | Seed, Series A, Series B | Cybersecurity, Logistics, AI, Industrial Tech | New fund, Sep 2026 | $23M (SEC Form D, 2026) | 4 Nov 2026 | 3 names · Unlock |
| Ten Eleven Ventures | VC firm | United States | Seed, Series A, Series B, Growth | Cybersecurity, AI, SaaS | New deal, Sep 2026 | 5 Nov 2026 | 8 names · Unlock |
You are seeing 18 of 37. The full list adds 19 more investors and 239 named decision-makers.
One-time payment. No subscription. No account.
Or get the free sample.
How these 37 break down
By US state
| US state | On this list | Share |
|---|---|---|
| California | 10 | 27% |
| New York | 7 | 19% |
| Florida | 4 | 11% |
| Colorado | 2 | 5% |
Method and limits
- Source
- 35 of the 37 rows carry an SEC filing (Form D or Form ADV). All 37 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 cybersecurity 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 7 Nov 2026.
- Fill rates
- Of 37 rows: stage 37, sector 37, fund size 32, website 37. In the paid file: named decision-makers on 35 rows, firm email on 11, LinkedIn page on 26, check size on 4.
- Corrections
- Email [email protected] or use the update form. We act within 5 working days.
Questions
How many Series B cybersecurity investors in the US are there?
We list 37 as of November 2026. 29 of the 37 have a fund filing or a dated deal in the last 12 months. The cities with the most are New York (6), Palo Alto (3) and San Francisco (2).
Which Series B cybersecurity investors in the US raised a new fund in the last 12 months?
21 of the 37 have a fund filing dated in the last 12 months. The most recent on this list are Bessemer Venture Partners (Oct 2026), Alpha Partners (Oct 2026) and SYN Ventures (Oct 2026).
What is the typical fund size of Series B cybersecurity investors in the US?
The median fund size on file for this list is $200M, across the 28 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 9 do not disclose a size there.
How do I contact Series B cybersecurity investors in the US?
The paid file holds 239 named decision-makers across 35 of these 37 and a firm email for 11. 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 cybersecurity investors in the US come from?
35 of the 37 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 7 Nov 2026 at the latest. The whole file is re-verified twice a year.
Broader lists
Cybersecurity venture capital firms in the US (214)Series B investors in the US (165)Series B cybersecurity investors (65)
Related lists
Seed cybersecurity investors in the US (134)Series B AI investors in the US (126)Series B SaaS investors in the US (108)Series B healthtech investors in the US (69)Series A cybersecurity investors in the US (64)Pre-seed cybersecurity investors in the US (60)Series B fintech investors in the US (59)Growth-stage cybersecurity investors in the US (55)Series B deep tech investors in the US (41)Series B medtech investors in the US (36)Series B biotech investors in the US (34)Series B energy investors in the US (29)Series B industrial tech investors in the US (29)Series B consumer investors in the US (29)Series B hardware investors in the US (28)Series B B2B investors in the US (27)Series B climate tech investors in the US (27)Series B developer tools investors in the US (21)
Not sure this is the right list? Describe your raise in the investor matching tool and get a shortlist. The link opens it set to cybersecurity, Series B and the US. Guide: how to find investors for a cybersecurity startup. Markdown version of this page.
Check the quality first
A free sample of 100 investors, every column, with sources and dates.