London deployed $15.3B in VC in 2025. These 14 Series A investors are actively writing checks for London startups in 2026.
Series A in London sits between $3M and $20M in 2026. The bar has moved - investors want $1M+ ARR, proven retention, and a clear technical wedge.
The median Series A check dropped from $15M to $10M since 2021. Revenue requirements doubled. Investors expect 3x+ YoY growth and unit economics that hold under scrutiny.
AI companies command the highest valuations. London AI startups raised $7.9B in 2025, roughly 30% of all UK VC. Non-AI B2B SaaS has cooled significantly.
Upload your financials to an Ellty data room before any Series A outreach. Most London funds expect a data room link before scheduling a first call.
| Stage | Check size | Sector focus | Website | |
|---|---|---|---|---|
| Atomico | Series A to growth | $5M-$50M+ | Deep tech, AI, fintech | atomico.com |
| Balderton Capital | Series A to growth | $1M-$20M | SaaS, fintech, deep tech | balderton.com |
| Index Ventures | Series A to growth | $5M-$30M | Enterprise, consumer, fintech | indexventures.com |
| Notion Capital | Seed to Series A | $1M-$15M | B2B SaaS, AI, vertical | notioncapital.com |
| Hoxton Ventures | Seed to Series A | $500K-$5M | Enterprise, consumer | hoxtonventures.com |
| MMC Ventures | Seed to Series A | $500K-$5M | AI, fintech, data | mmc.vc |
| Frontline Ventures | Seed to Series A | $2M-$15M | B2B SaaS, transatlantic | frontline.vc |
| Octopus Ventures | Seed to Series B | $1M-$10M | Health, deep tech, consumer | octopusventures.com |
| Episode 1 Ventures | Seed to Series A | $500K-$3M | B2B, marketplace, SaaS | episode1.com |
| Molten Ventures | Seed to Series B | $2M-$15M | Fintech, deep tech, consumer | moltenventures.com |
| Kindred Capital | Seed to Series A | $500K-$3M | B2B SaaS, AI | kindredcapital.vc |
| Fuel Ventures | Pre-seed to Series A | $100K-$2M | Tech, all sectors | fuel.ventures |
| Playfair Capital | Pre-seed to Series A | $100K-$1M | AI, fintech, B2B SaaS | playfaircapital.com |
| Air Street Capital | Seed to Series A | $1M-$10M | AI, deep tech, research | air.st |
See which Series A VCs open your pitch
Build an Ellty data room. Track which London Series A investors open it.
Start free 14-day trialWhat is a London Series A investor?
A London Series A investor leads a $3M-$20M round after product-market fit. They buy 15-25% equity and typically expect a board seat.
Check sizes vary. Atomico averages $16.5M. Notion writes $1M-$15M first checks and follows on at growth. Series A is more formal - proper due diligence and legal docs are standard from day one.
Read how to prepare for due diligence before any outreach. Compare London seed investors if you're raising your first round.
Atomico raised $1.24bn in two new funds. The $485m early-stage fund focuses on Series A. It is our biggest raise to date and reflects confidence in European deep tech.
14 London Series A investors
1. Atomico
Atomico's $1.24B makes them the largest London-based Series A backer. Average check is $16.5M with 65 deals at that stage. 6 investments in 2026 including Andercore $40M Series B (Feb 2026) and Dexory $165M Series C (Oct 2025).
- Recent Deals: Andercore $40M Series B (Feb 2026); Dexory $165M Series C (Oct 2025); Ben $27.5M Series B (Dec 2025); Lakera $20M Series A; 6 investments in 2026
- LinkedIn: Atomico LinkedIn
- Sector Focus: Deep tech, AI, fintech, consumer, enterprise
- Stage Focus: Series A to growth
- Location: London, UK
- Website: atomico.com
2. Balderton Capital
Balderton raised $1.3B and backs European-founded tech exclusively. 110 Series A investments averaging $17.9M. Grand Games $70M Series B (May 2026) and Escape $18M (Mar 2026) are their latest 2026 deals.
- Recent Deals: Grand Games $70M Series B (May 2026); Escape $18M (Mar 2026); Primer (May 2026); Davis $5.5M (May 2026); 14 investments in 2026
- LinkedIn: Balderton Capital LinkedIn
- Sector Focus: SaaS, fintech, deep tech, consumer tech, AI
- Stage Focus: Series A to growth
- Location: London, UK
- Website: balderton.com
3. Index Ventures
Index raised $2.3B and has 236 Series A investments averaging $15.8M. Recent UK deal: Adfin $18M Series A. Portfolio includes Figma (NYSE, $13.5B) and Revolut. 55 investments in 2025 and 65 unicorns total.
- Recent Deals: Adfin $18M Series A (2025); 55 investments in 2025; Figma NYSE listing $13.5B; Revolut portfolio; 65 unicorns total
- LinkedIn: Index Ventures LinkedIn
- Sector Focus: Enterprise, consumer, fintech, infrastructure, AI
- Stage Focus: Series A to growth
- Location: London, UK
- Website: indexventures.com
4. Notion Capital
Notion's 5th fund is EUR 300M with a $130M growth fund (Sep 2025). 7 investments in 2026 including Isembard $50M Series A (Mar 2026). 59 Series A investments at $10.7M average.
Use Ellty to share your financial model. Notion checks NRR, CAC payback, and ARR growth rate before scheduling any call.
- Recent Deals: Isembard $50M Series A (Mar 2026); Naboo EUR 20M Series A; 7 investments in 2026; $130M growth fund (Sep 2025); 150 total companies
- LinkedIn: Notion Capital LinkedIn
- Sector Focus: B2B SaaS, AI, fintech, vertical software
- Stage Focus: Seed to Series A
- Location: London, UK
- Website: notioncapital.com
5. Hoxton Ventures
Hoxton writes $500K-$5M at seed and Series A. Two major exits in 12 months: Deliveroo at $3.86B (Apr 2025) and Kaia Health at $285M (Jan 2026). Latest 2026: Giraffe360 $10M Series B (Mar 2026).
- Recent Deals: Giraffe360 $10M Series B (Mar 2026); Deliveroo $3.86B exit (Apr 2025); Kaia Health $285M exit (Jan 2026); Finster AI Series A (Oct 2025); Phagos investment
- LinkedIn: Hoxton Ventures LinkedIn
- Sector Focus: Enterprise, consumer, life sciences, vertical SaaS
- Stage Focus: Seed to Series A
- Location: London, UK
- Website: hoxtonventures.com
Share your deck with trackable links
Use Ellty to track which London Series A VCs review your data room.
Start free 14-day trial6. MMC Ventures
MMC focuses on AI and data with a proprietary dataset thesis. They led Sable Bio GBP 2.8M seed (Feb 2026) and backed Stanhope AI $8M seed (Feb 2026). 11 investments in 2025 and 3 in early 2026.
- Recent Deals: Sable Bio GBP 2.8M seed (Feb 2026); Stanhope AI $8M seed (Feb 2026); 11 investments in 2025; AI and fintech mandate
- LinkedIn: MMC Ventures LinkedIn
- Sector Focus: AI, fintech, data, enterprise software
- Stage Focus: Seed to Series A
- Location: London, UK
- Website: mmc.vc
7. Frontline Ventures
Frontline backs B2B SaaS on a transatlantic strategy - European companies expanding to the US. They write $2M-$15M at Series A from offices in London, Dublin, and New York.
- Recent Deals: Active Series A portfolio; transatlantic B2B SaaS mandate; London, Dublin, NY offices; Series A lead focus; European-US expansion playbook
- LinkedIn: Frontline Ventures LinkedIn
- Sector Focus: B2B SaaS, enterprise, marketplace
- Stage Focus: Seed to Series A
- Location: London, UK
- Website: frontline.vc
8. Octopus Ventures
Octopus manages over GBP 1.5B with specialist teams across health, deep tech, fintech, consumer, and climate. 18 investments in 2025 and 6 in early 2026. Graze exited to Katjes (Dec 2025).
Set up an Ellty data room before approaching Octopus. Each sector team runs a separate process - know which one covers your space.
- Recent Deals: 18 investments in 2025; 6 in early 2026; Graze exit to Katjes (Dec 2025); Manna investment; 353 total companies
- LinkedIn: Octopus Ventures LinkedIn
- Sector Focus: Health, deep tech, fintech, consumer, climate
- Stage Focus: Seed to Series B
- Location: London, UK
- Website: octopusventures.com
9. Episode 1 Ventures
Episode 1 has 122 portfolio companies. They backed Lawhive $60M Series B (Feb 2026) and Robin AI $26M Series B. They write GBP 500K-3M at seed and Series A across UK B2B and marketplace startups.
- Recent Deals: Lawhive $60M Series B (Feb 2026); Robin AI $26M Series B; Zelt $6M (Jan 2025); 122 total companies; 5 new in 12 months
- LinkedIn: Episode 1 Ventures LinkedIn
- Sector Focus: B2B, marketplace, SaaS, fintech, legaltech
- Stage Focus: Seed to Series A
- Location: London, UK
- Website: episode1.com
10. Molten Ventures
Molten is a London-listed VC trust with 117 companies. Hilo $42M Series B (Jan 2026) and Modo Energy GBP 25M (Dec 2025) are their latest deals. They write GBP 2M-15M at Series A.
- Recent Deals: Hilo $42M Series B (Jan 2026); Modo Energy GBP 25M (Dec 2025); 117 total portfolio; Stride VC seed backing; consumer and fintech mandate
- LinkedIn: Molten Ventures LinkedIn
- Sector Focus: Fintech, consumer tech, enterprise SaaS, deep tech
- Stage Focus: Seed to Series B
- Location: London, UK
- Website: moltenventures.com
11. Kindred Capital
Kindred portfolio founders share in the fund's carried interest - rare in UK VC. They write GBP 500K-3M at seed and Series A. Highly selective at 6-8 investments per year.
- Recent Deals: Active seed and Series A portfolio; equitable carry-sharing model; 6-8 investments per year; B2B SaaS and AI mandate
- LinkedIn: Kindred Capital LinkedIn
- Sector Focus: B2B SaaS, marketplace, AI, consumer
- Stage Focus: Seed to Series A
- Location: London, UK
- Website: kindredcapital.vc
12. Fuel Ventures
Fuel writes GBP 100K-2M across all UK tech sectors. 100+ portfolio companies and one of the most active London funds by deal volume. First meeting to term sheet can take under two weeks.
Upload your pitch to Ellty before reaching out. Fuel wants materials ready immediately when they express interest.
- Recent Deals: 100+ portfolio companies; pre-seed and Series A; all UK tech sectors; high deal volume; fast process
- LinkedIn: Fuel Ventures LinkedIn
- Sector Focus: Tech startups, all sectors
- Stage Focus: Pre-seed to Series A
- Location: London, UK
- Website: fuel.ventures
13. Playfair Capital
Playfair writes GBP 100K-1M at pre-seed and seed with follow-on at Series A. Operator angels co-invest alongside the fund. Fast decisions and strong London network access.
- Recent Deals: Active pre-seed and seed portfolio; Series A follow-on; operator angel co-investment; AI and fintech mandate; London-headquartered
- LinkedIn: Playfair Capital LinkedIn
- Sector Focus: AI, fintech, B2B SaaS, enterprise
- Stage Focus: Pre-seed to Series A
- Location: London, UK
- Website: playfaircapital.com
14. Air Street Capital
Air Street backs AI and deep tech with a research-first thesis. Founded by Nathan Benaich, who publishes the State of AI report. They write $1M-$10M and prioritize companies with proprietary data moats.
- Recent Deals: Active AI and deep tech portfolio; State of AI report author; proprietary data thesis; $1M-$10M checks; AI-native focus
- LinkedIn: Air Street Capital LinkedIn
- Sector Focus: AI, deep tech, research, enterprise
- Stage Focus: Seed to Series A
- Location: London, UK
- Website: air.st
What Series A diligence looks like in London
Series A due diligence runs 6-12 weeks. Investors check your financial model, cap table, customer contracts, and key person dependencies. Clean records before the process starts.
The biggest red flags: monthly churn over 5%, revenue concentrated in one customer, and unresolved equity disputes. Any of these extends the timeline or kills the deal.
Share your data room via Ellty when diligence starts. You'll see which documents each fund reviews and can address gaps proactively. Read due diligence documents to prepare in advance.
How to get a warm intro to London Series A funds
Most London Series A funds don't take cold inbound. Warm intros from seed investors or portfolio founders convert at 10x the rate of cold emails. Build those relationships at seed stage now.
If you don't have a warm path, content works. Publishing real data about your market positions you as credible. Investors notice founders who share specific vertical insights.
Send your Ellty data room link immediately when a fund asks for materials. Read due diligence for investors to understand what London VCs are actually checking.
London's Series A market in 2026
London deployed more VC than France, Germany, and Spain combined in Q1 2026. AI takes the largest share. Series A for vertical AI closes at $8M-$20M with 18-month runways built in.
B2B SaaS without an AI angle is harder to fund. Compare London AI investors and London fintech investors for sector-specific options.
Defence and climate are the other growth areas in 2026. Capital chases defensible IP with government-adjacent contracts. Compare London cleantech investors for that sector.
How to pitch a London Series A investor
Five steps to close a Series A in London in 2026. These reflect how active funds screen deals.
- 1.Hit the $1M ARR threshold firstMost funds pass below $1M ARR. Build to the number before outreach starts.
- 2.Match your sector to the right fundAI goes to Atomico or Air Street. B2B SaaS goes to Notion or Frontline. Be precise.
- 3.Get a warm intro via your seed investorCold emails rarely work at Series A. Your seed fund network is the fastest path in.
- 4.Send a data room link, not a deck attachmentUpload your financials to Ellty. Send one link and track who opens which pages.
- 5.Have clean due diligence materials ready upfrontCap table and contracts ready before diligence starts. Delays kill deal momentum.
How Ellty helps you land a London Series A investor
You know the funds. Now prepare your data room. Series A investors expect materials before any first call.
- 1.Build your data room before outreach startsUpload your deck, model, and cap table. Send a link, not email attachments.
- 2.Set permissions for sensitive financial docsRequire email to view your cap table. Block screenshots on confidential models.
- 3.Track which funds engage with your materialsSee who opens your deck and how long they spend. Follow up with engaged funds.
Common questions about London Series A funding
- Most funds want $1M+ ARR. AI companies can raise earlier with strong growth and a data moat.
- Expect 4-6 months from first meeting to close. A ready data room cuts weeks off the process.
- Seed funds back teams before product-market fit. Series A VCs need proven metrics and scalable models.
- Yes - run a competitive process. Send your data room to 8-12 funds and prioritize the engaged ones.
- Not always, but EIS eligibility needs UK incorporation. Check the structure before finalizing your entity.
- Before your first outreach goes out. Investors ask for materials immediately when they are interested.
