20 VC firms investing in security & cybersecurity and marketing & adtech at the Series A stage.
F4 Fund tracks 20 VC firms that actively invest in security & cybersecurity + marketing & adtech at the Series A stage, with check sizes ranging from $100K – $60M (median: $5.1M – $5.1M). As of June 2026, and 100% lead or co-lead rounds. Rankings are based on F4's proprietary analysis of 1,358+ researched VC firms, scored by data completeness, portfolio depth, investment recency, and stage alignment.
| # | Firm | Check Size | Portfolio | Leads? | Activity | Decision | Intro |
|---|---|---|---|---|---|---|---|
| 1 | ▶ Storm Ventures Storm Ventures backs early-stage B2B enterprise software companies with a focus on AI-native applications, cybersecurity, and cloud infrastructure. They employ a 'paddling to surfing' growth methodology and have deep expertise in taking companies from inception to $100M+ ARR. Their philosophy: 'the interface layer will disappear. The infrastructure layer will compound.' Menlo Park | $1M – $15M | 67 | Leads | Active | ~1 mo | — |
| 2 | ▶ Accel Partner with exceptional teams building transformative technology companies across all stages San Francisco | $2M – $10M | 127 | Both | Active | — | — |
| 3 | ▶ Boldstart Ventures We invest in bold technical founders building the autonomous enterprise. Before you build your team, before you write your first line of code—that's when boldstart gets to work. We collaborate with technical founders at Inception, lead pre-product rounds, and help turn bold ideas into category-creating companies. Miami | $250K – $15M | 27 | Leads | Active | ~1 wk | Open |
| 4 | ▶ GFR Fund GFR Fund invests in pre-seed to Series A companies building emerging digitally-native communities in gaming, entertainment, and consumer tech. They seek founders who deeply understand community-building, whether they have a product with an existing community or are in early stages of building one. Strong focus on execution, founder-market fit, and capital efficiency. | $250K – $500K | 69 | Both | Active | ~2 wks | Open |
| 5 | ▶ Knoll Ventures Back outlier B2B founders who see around corners and intimately understand customer pain points, investing at the pre-Series A stage to bridge the gap between seed and Series A — especially in underserved non-coastal markets like the Southeast US. Atlanta | $500K – $3M | 37 | Both | Active | — | Open |
| 6 | ▶ Theory Ventures Thesis-driven firm backing software companies that turn technology discontinuities into durable go-to-market advantages. Core focus: The Decade of Data — AI-native enterprise software, modern data stack evolution, and web3 data infrastructure. San Francisco | $1M – $25M | 16 | Leads | Active | ~1 mo | Open |
| 7 | ▶ Pathlight Ventures Low volume, high conviction early-stage investing in 10 thematic areas where vertical AI is reshaping regulated, complex industries: healthcare, fintech, capital markets, industrial operations, security, and government. Back strongly opinionated founders building category-defining companies with direct operator support from a team with deep fintech and growth scaling experience. New York City | $250K – $3M | 39 | Leads | Active | ~1 mo | Open |
| 8 | ▶ Point Nine Invest in the future of software built on AI. We partner with technical founders to provide capital, unfair shortcuts, and operational support to accelerate their learning and help them reach their potential. We position ourselves as the first institutional investor for v0.9 stage founders. Berlin | $1M – $10M | 36 | Leads | Active | ~1 wk | Req'd |
| 9 | ▶ Companyon Ventures Companyon backs a small number of capital-efficient, founder-led B2B software companies at the seed-to-Series-A transition and pairs capital with hands-on GTM, talent, and fundraising support. Boston | $2M – $8M | 22 | Leads | Active | — | Open |
| 10 | ▶ R136 Ventures Identifies inflection points through proprietary Discovery Engine and backs founders who see opportunities others miss. Focuses on AI-driven transformation of B2B software and financial services, with deep technical due diligence analyzing 250+ data points. Woodside, CA | $2M – $20M | 40 | Both | Active | ~1 mo | Open |
| 11 | ▶ Icehouse Ventures Back exceptional Kiwi founders building globally transformative companies, from day one to IPO. New Zealand founders represent a significantly undervalued asset class, and Icehouse provides capital plus an ecosystem of 3,000+ investors and deep operational support. Auckland | $100K – $10M | 41 | Leads | Active | ~2 mo | Open |
| 12 | ▶ Sierra Ventures Sierra believes enterprise software is being fundamentally transformed by cloud computing and AI. They invest in technical founders building the next generation of enterprise solutions that deliver superior ROI through better efficiency, automation, and capability. The firm particularly focuses on infrastructure, security, healthcare innovation, and emerging deep tech. San Mateo, California | $500K – $15M | 28 | Both | Active | ~2 wks | Req'd |
| 13 | ▶ Entrepreneurs Roundtable Accelerator (ERA) NYC has tremendous entrepreneurial talent but lacked a structured environment for early-stage founders. ERA provides capital, intense mentorship, and network access to help founders build market-leading companies. Every sector deserves innovation. New York | $150K – $150K | 39 | Leads | Active | ~2 mo | Open |
| 14 | ▶ FirstMark We back disruptive founders building category-defining companies. Our approach is founder-first, long-term, and deeply operational. We take the longest view in the room, operate with excellence and integrity, stay curious at the bleeding edge, and invest heavily in building community. New York | $250K – $10M | 32 | Leads | Active | ~2 wks | Req'd |
| 15 | ▶ IA Ventures Data is the defensible moat in technology. We invest in companies that build proprietary data assets, analytics capabilities, or machine learning advantages to dominate their categories. Founded on 'information arbitrage' thesis - applying hedge fund quantitative discipline to early-stage venture. New York | $250K – $750K | 16 | Leads | Active | ~2 wks | Open |
| 16 | ▶ ZhenFund Believe in innovation, risk-taking, and young talent. Best entrepreneurs are rare and precious. Provide quick capital, friendly terms, genuine commitment. Help but don't complicate. Monthly founder support. Beijing | $250K – $3M | 25 | Leads | Active | ~2 wks | Open |
| 17 | ▶ Evantic Capital At the intersection of generational talent and transformative artificial intelligence. Evantic backs exceptional founders building AI-first B2B software, infrastructure, and platform businesses with the potential to become global market leaders. London | $1M – $60M | 10 | Both | Active | — | — |
| 18 | ▶ Kima Ventures Back ambitious teams with strong learning and execution capacities across all sectors, stages, and geographies. Technology-enabled businesses preferred. Volume-based, founder-centric investment philosophy. Paris | $100K – $200K | 25 | Leads | Active | ~2 wks | Open |
| 19 | ▶ Mucker Capital Venture capital should be accessible to exceptional entrepreneurs anywhere. Great companies can be built outside Silicon Valley with the right capital, operational expertise, and network support. Santa Monica | $100K – $15M | 21 | Leads | Active | ~2 mo | Open |
| 20 | ▶ Stout Street Capital Great startups can be built anywhere. We believe in founder-centric investing with operational support from a team of successful founders. We serve undernetworked geographic regions. Denver | $100K – $500K | 26 | Both | Active | ~2 wks | Open |
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Firms that frequently co-invest with investors on this page
F4 Fund tracks 20 VC firms that actively invest in security & cybersecurity + marketing & adtech at the Series A stage. These firms are ranked using a composite score that weighs data completeness (30%), portfolio depth (30%), investment recency (25%), and stage alignment (15%).
Based on F4's analysis, the median check size for series a security & cybersecurity + marketing & adtech investors is $5.1M – $5.1M, with a full range from $100K – $60M. The distribution breaks down as: 4 firms in the <$500K range, 1 firms in the $500K-$1M range, 3 firms in the $1M-$2M range, 9 firms in the $5M-$10M range, 3 firms in the $10M+ range.
Among the 20 firms tracked, 100% lead or co-lead rounds. Founders seeking a lead investor should filter for firms marked "Leads" or "Both" in the rankings table above. Lead investors typically set deal terms and anchor the round.
The best series a security & cybersecurity + marketing & adtech investors combine domain expertise with an active portfolio in the space. Among these firms, 18% prefer warm introductions, and the average firm has 37 portfolio companies. Look for firms whose check size matches your raise, whose stage preference aligns with yours, and who have a track record of supporting companies in your sector through multiple growth phases.
Firm profiles are continuously updated through F4's research pipeline, which combines LLM-powered web research, portfolio analysis, and transcript extraction. The ranking data refreshes every 12 hours. Editorial analysis is reviewed weekly. Individual firm profiles are re-researched on a 30-day cycle or when new information surfaces.