7 VC firms investing in marketing & adtech and hr tech & future of work at the Series B stage.
F4 Fund tracks 7 VC firms that actively invest in marketing & adtech + hr tech & future of work at the Series B stage, with check sizes ranging from $150K – $25M (median: $5.3M – $5.3M). As of July 2026, and 86% lead or co-lead rounds. Rankings are based on F4's proprietary analysis of 1,364+ 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 | ▶ Blossom Street Ventures Data-driven early-stage growth SaaS investor backing cash-efficient, resourceful founders with $2M-$30M ARR. Metrics-first evaluation, no warm intro required, single-partner model for speed and transparency. Dallas | $1M – $4M | 31 | Both | Active | ~1 mo | Open |
| 3 | ▶ Bigfoot Capital Non-dilutive growth capital for B2B software companies. Alternative to venture capital focused on sustainable, capital-efficient growth that preserves founder equity and optionality. Fills gap between traditional bank lending and venture financing. Denver | $150K – $5M | 25 | Follows | Active | ~2 wks | Open |
| 4 | ▶ 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 |
| 5 | ▶ Bling Capital The hardest thing in seed is finding product-market fit. We help you find it. If you already have product-market fit, we will help you scale. We partner with exceptionally ambitious founders for the long run and provide capital combined with operational expertise through our 100+ member Product Council. San Francisco | $500K – $3M | 33 | Leads | Active | ~2 mo | Open |
| 6 | ▶ Plymouth Growth Exceptional founder-led B2B technology businesses exist outside traditional coastal venture and PE systems. We back gritty founders who think differently and approach sustainable, balanced growth without venture-style moonshot pressure or traditional PE playbooks. Detroit | $5M – $25M | 19 | Leads | Active | ~1 mo | Open |
| 7 | ▶ Sigma Prime Ventures Early-stage technology companies solving hard business problems with SaaS, cloud, mobile, and disruptive technologies. We back technical founders with domain expertise and market understanding across diverse sectors. Boston | $500K – $10M | 10 | Both | Active | ~2 wks | Req'd |
Investors on this page also frequently invest in these sectors
What other stages do these firms also invest in?
What other sectors do these firms also invest in?
F4 Fund tracks 7 VC firms that actively invest in marketing & adtech + hr tech & future of work 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 marketing & adtech + hr tech & future of work investors is $5.3M – $5.3M, with a full range from $150K – $25M. The distribution breaks down as: 1 firms in the $1M-$2M range, 2 firms in the $2M-$5M range, 2 firms in the $5M-$10M range, 2 firms in the $10M+ range.
Among the 7 firms tracked, 86% lead or co-lead rounds, and 14% typically follow. 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 marketing & adtech + hr tech & future of work investors combine domain expertise with an active portfolio in the space. Among these firms, 17% prefer warm introductions, and the average firm has 32 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.