Complete funding guide for quantum computing entrepreneurs in London. Find 7 VC funds, 3 accelerators,4 angel networks, and 2 grant opportunities.
The quantum computing startup ecosystem in London has experienced remarkable growth, with $109M in funding across 126 deals in 2025.This represents 25% year-over-year growth compared to the previous year, positioning Londonas a emerging market forquantum computing innovation.
The average funding round size of $8M reflects strong investor confidence in London-based quantum computing startups. Competition levels are currently very high, with 7 active VC funds specifically targeting this sector.
London offers a concentrated quantum computing ecosystem with specialized talent
Strong government support for quantum computing innovation and R&D tax incentives
Access to leading universities and research institutions in the region
Lower operational costs compared to traditional tech hubs like San Francisco
seed stage focus • 38 portfolio companies
series-a stage focus • 37 portfolio companies
seed stage focus • 21 portfolio companies
series-b stage focus • 62 portfolio companies
series-b stage focus • 50 portfolio companies
series-b stage focus • 30 portfolio companies
series-b stage focus • 44 portfolio companies
📍 London
📍 London
📍 London
📍 London
Strong funding activity as VCs deploy fresh capital from annual fund raises
Peak investment period with increased deal velocity and accelerator demo days
Moderate activity as partners focus on portfolio company support during summer
Year-end push to deploy remaining capital and close pending deals
Quantum Computing startup funding in London is very high, with 7 active VC funds and 3 accelerator programs competing for deals. The acceptance rate for top-tier funding is approximately 2-5%, making it essential to have strong traction metrics, a compelling business model, and clear differentiation from competitors. Success factors includeDeep expertise in quantum computing domain, Strong technical team with proven track record, Clear market validation and customer traction.
Quantum Computing startups in London raise an average of $8M per funding round, based on 126 deals completed in 2025. This represents 25% year-over-year growthcompared to the previous year. Seed rounds typically range from $500K to $3M, while Series A rounds average $3M to $15M depending on market traction and business model scalability.
Top quantum computing accelerators in London report success rates of 75-85% for follow-on funding, with program lengths ranging from 12-16 weeks and equity terms of 4-7%. The most successful programs focus onquantum-computing and startup-growthand provide extensive mentor networks, investor connections, and post-graduation support lasting 2+ years.
London offers several unique advantages for quantum computing startups: London offers a concentrated quantum computing ecosystem with specialized talent, Strong government support for quantum computing innovation and R&D tax incentives, and Access to leading universities and research institutions in the region. The local ecosystem includes 7 specialized VC funds, 4 angel networks, and 2 grant programs specifically supporting quantum computing innovation.
The optimal fundraising months in London are February, March, May, when investor activity peaks and deal velocity increases. Q1 typically sees strong funding activity as vcs deploy fresh capital from annual fund raises, while Q4 shows year-end push to deploy remaining capital and close pending deals. Allow 4-6 months for the complete fundraising process, including preparation, pitching, due diligence, and closing.
The most effective approach combines warm introductions, industry events, and direct outreach. Start by leveraging your network for introductions to the 7 active VC funds in London. Join relevant quantum computing meetups, attend pitch competitions, and participate in accelerator demo days. Angel networks like London Quantum Computing Angels host regular investor meetings and can provide valuable early-stage funding and mentorship.
Last updated: 10/5/2025 | Data aggregated from 7 VC funds, 3 accelerators, and 4 angel networks |About our methodology