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8 Series A Cybersecurity investors in San Francisco

As of October 16, 2026, DryPowder lists 8 Series A Cybersecurity venture funds in San Francisco. Their median published check range is $500K–$5M (5 of 8 funds publish one). None has filed a verified SEC Form D in the last 90 days.

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funds listed
8
median check (5 of 8 publish one)
$500K–$5M
filed an SEC Form D in the last 90 days
0
last updated, 2026
Oct 16

All 8 Series A Cybersecurity funds in San Francisco

  1. BOLDstart Ventures
    $250K–$5MSeedSeries A

    Partner with bold technical founders from inception, before product or first check, backing AI-native infrastructure, security, apps, and models to…

    1 partner listed
  2. Amplify Partners
    $500K–$3MSeedSeries A

    Amplify invests in technical founders building the next generation of applications, models, tools, and infrastructure. For almost 15 years they have…

    2 partners listed
  3. SignalFire
    $500K–$5MSeedSeries ASeries B

    SignalFire is a VC firm built like a tech company that combines AI tools, data infrastructure, and deep sector expertise with portfolio support to…

    Partners not yet listed
  4. Vertex Ventures
    $500K–$10MSeedSeries A

    We are founders and operators who partner with early-stage founders building infrastructure and SaaS companies, leveraging our experience to help…

    6 partners listed
  5. Sequoia Capital
    $500K–$50MSeedSeries ASeries BSeries CGrowth

    Help the daring build legendary companies through capital, expertise, and network.

    18 partners listed
  6. Mayfield Fund
    SeedSeries A

    First institutional investor for early-stage AI founders, with 70% of investments beginning at inception. People-first approach to building…

    Partners not yet listed
  7. Greylock Partners
    SeedPre-SeedSeries A

    First-check investor (pre-seed, seed, series A) deeply focused on AI-first companies. Partners selectively, cares deeply, and strives for excellence…

    Partners not yet listed
  8. Bain Capital Ventures
    SeedSeries ASeries BGrowth

    Use tightly focused expertise and an unparalleled global network to help founders realize their potential across all stages, from incubation to…

    Partners not yet listed

How this list is built

DryPowder lists every fund with a public profile tagged Series A and Cybersecurity and headquartered in San Francisco. Funds whose largest published check is $5M or less come first; inside each group, funds with a verified SEC Form D in the last 30 days lead, then profile quality decides. Form D dates come from SEC EDGAR, and SPV and single-deal filings are dropped. Check sizes are what each fund publishes; the median uses only the 5 funds that publish one.

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Frequently asked questions

How many Series A Cybersecurity VCs in San Francisco are there?

As of October 16, 2026, DryPowder lists 8 Series A Cybersecurity venture funds in San Francisco with a public profile. The first 5 on this page are BOLDstart Ventures, Amplify Partners, SignalFire, Vertex Ventures and Sequoia Capital.

Which Series A Cybersecurity VCs in San Francisco are actively investing right now?

None of the 8 filed a verified SEC Form D in the last 90 days. A Form D is filed when a fund starts raising; SPVs and single-deal vehicles are not counted.

What check size do Series A Cybersecurity VCs in San Francisco write?

The median published range is $500K–$5M, across the 5 of 8 funds that publish a check size. Published checks on this list run from $250K to $50M.

How does DryPowder build this list?

A fund is listed when its public profile is tagged Series A and Cybersecurity and its headquarters is San Francisco. Funds whose largest published check is $5M or less come first; within each group, funds that filed a Form D in the last 30 days lead, then profile quality decides. Form D dates come from SEC EDGAR, with SPVs excluded. Data as of October 16, 2026.

Sources

Updated