12 VC firms investing in security & cybersecurity and marketing & adtech at the Series B stage.
F4 Fund tracks 12 VC firms that actively invest in security & cybersecurity + marketing & adtech at the Series B stage, with check sizes ranging from $100K – $500M (median: $8M – $8M). As of August 2026, and 100% lead or co-lead rounds. Rankings are based on F4's proprietary analysis of 1,581+ 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 | N/A |
| 2 | ▶ 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 |
| 3 | ▶ Summit Partners Summit Partners backs category-leading companies in Technology, Healthcare & Life Sciences, and Growth Products & Services, investing $10M-$500M per company to power profitable growth. They take minority or majority positions as active board partners backed by the Peak Performance Group operational team. Boston | $10M – $500M | 40 | Leads | Active | ~2 mo | Open |
| 4 | ▶ Accel Partner with exceptional teams building transformative technology companies across all stages San Francisco | $2M – $10M | 136 | Both | Active | N/A | N/A |
| 5 | ▶ Highland Europe Highland Europe backs exceptional teams in Europe and Israel building the next generation of technology leaders, focusing on product-led software and consumer companies with organic growth, clear product-market fit, and capital discipline. London | $20M – $90M | 65 | Leads | Active | N/A | N/A |
| 6 | ▶ PeakSpan Capital PeakSpan invests exclusively in Applied AI B2B software scale-ups at $3M–$50M+ ARR, providing growth equity combined with hands-on operational platform support (500+ expert community, proprietary technology tools, proven playbooks) to help founders scale with discipline and achieve optimal risk-adjusted exits. New York | $10M – $50M | 57 | Leads | Active | ~1 mo | N/A |
| 7 | ▶ 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 | 42 | Both | Active | ~1 mo | Open |
| 8 | ▶ 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 |
| 9 | ▶ 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 |
| 10 | ▶ 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 | 11 | Both | Active | N/A | N/A |
| 11 | ▶ Mucker Capital Mucker Capital is an early-stage venture capital firm investing in technology companies from pre-seed through Series B. We partner closely with founders building scalable businesses, often providing a company’s first institutional check and continuing to support them through later stages. Mucker has offices in Venice, California, Austin, and Toronto, and primarily invests across the United States and Canada, with the ability to back exceptional founders in other markets. Venice | $100K – $15M | 22 | Leads | Active | ~2 mo | Open |
| 12 | ▶ 3VC Entrepreneurs by heart, investors by choice: 3VC partners with regional talent across DACH, CEE, the Baltics, and Southern Europe showing early signs of product-market fit and customer love, and helps them become global category leaders. Vienna | $2M – $10M | 24 | Both | Active | N/A | Open |
What other stages do these firms also invest in?
Investors on this page also frequently invest in these sectors
What other sectors do these firms also invest in?
F4 Fund tracks 12 VC firms that actively invest in security & cybersecurity + marketing & adtech at the Series B 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 b security & cybersecurity + marketing & adtech investors is $8M – $8M, with a full range from $100K – $500M. The distribution breaks down as: 1 firms in the $500K-$1M range, 6 firms in the $5M-$10M range, 5 firms in the $10M+ range.
Among the 12 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 b security & cybersecurity + marketing & adtech investors combine domain expertise with an active portfolio in the space. Among these firms, 0% prefer warm introductions, and the average firm has 46 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.