William Martin
Founder and Director @ Portfolio Ventures
London, United Kingdom
William Martin is a seed investor at Portfolio Ventures in London focused on Software and Financial Services. Will Martin - Founder and Director @ Portfolio Ventures
- Total investments:
- 107
- Last investment:
- Lead investor:
- 0%
Last updated:
For AI agents: llms.txt
Industries William Martin invests in
Stages William Martin invests in
Countries William Martin invests in
Round sizes
Contacts
| Type | Contact | Validation |
|---|---|---|
| Work email | ||
| Personal email | ||
| Work phone | ||
| Personal phone | ||
| Socials |
Round size
- Seed
- $874k–$5.5M
- Series A
- $2.3M–$11M
- Venture - Series Unknown
- $1.5M–$6.6M
Investment Focus
Industry
- Software 27 (25%)
- Financial Services 26 (24%)
- FinTech 22 (21%)
- Artificial Intelligence 20 (19%)
- SaaS 15 (14%)
Stage
- Seed 62 (58%)
- Series A 13 (12%)
- Venture - Series Unknown 10 (9%)
- Pre-Seed 9 (8%)
- Funding Round 4 (4%)
Country
- United Kingdom 90 (84%)
- United States 2 (2%)
- Japan 1 (1%)
- Isle of Man 1 (1%)
Investments
| Company | Description | Round | Links |
|---|---|---|---|
| Kuai Commerce is a social commerce solutions for brand acceleration. | $11.1M / Series A / Sep 21, 2025 | ||
| Firenze aims to expand financial services by extending investment-backed lending to a wider audience, recognizing its importance in wealth creation and preservation. The founding team aims to democratize Lombard lending, making it accessible to all, while focusing on mass affluent clients. | $3.2M / Seed / Mar 26, 2025 | ||
| Burbank's technology creates the most seamless customer experience by enabling authentication of users anytime, at any time, using the widely known "Tap and PIN." Burbank gives companies the ability to produce the remarkable. | $6.5M / Seed / Mar 25, 2025 | ||
| Swap is a software company that specializes in returns, exchanges, and funding for e-commerce. | $40M / Series B / Mar 04, 2025 | ||
| Bourn's technology is designed to automate cash flow management, offering SMEs fast access to capital. | $1.9M / Seed / Feb 26, 2025 | ||
| Prosper's offering includes fee-free investments in public market index funds, including fund fees, as well as SIPP and ISA wrappers. | $5M / Seed / Jan 29, 2025 | ||
| Jove is an insurtech company to provide flexible bundled insurance for contractors and freelancers | $4.5M / Seed / Nov 29, 2024 | ||
| Heim Health is a healthcare firm using technology to deliver scalable, community-based solutions. | $2.8M / Seed / Nov 19, 2024 | ||
| Passionfruit is bringing together the next generation of leading independent marketing talent and providing a digital home where they can work, learn and earn, so startups and enterprises can work with them on-demand. | $9M / Series A / Jul 23, 2024 | ||
| Made With Intent is a segmentation tool that allows data-driven retailers to quickly discern and target customer intent while optimizing marketing strategies. It enables retailers to interact successfully and increase conversions in today's competitive market context. | $1.9M / Seed / May 02, 2024 | ||
| See all 107 investments → | |||
Co-Investors
About Portfolio Ventures
Portfolio Ventures was founded in October 2014 by Will Martin and Will Brooks. They have been involved in raising funding for over 120 early stage companies. They set up Portfolio Ventures to work with high-quality UK startups that have already achieved early traction, are ready to scale and will benefit from access to their network of sophisticated private and professional investors.
Portfolio Ventures Contacts
| Name | Phone | Socials | |
|---|---|---|---|
|
William Martin
Founder and Director
|
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William Brooks
Founder & Director
|
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FAQ
What does William Martin invest in?
William Martin invests primarily in Software, Financial Services and FinTech startups, most often at Seed and Series A stage. Most of the 107 investments tracked by Shizune back companies in United Kingdom. The Investment Focus section breaks down every industry, stage and country in the portfolio.
What round sizes does William Martin invest in?
William Martin typically joins rounds of $874k–$5.5M at Seed, $2.3M–$11M at Series A and $1.5M–$6.6M at Venture - Series Unknown. These are whole funding-round sizes, not William Martin's own check, which is rarely disclosed: the 10th–90th percentile of the confirmed public funding rounds William Martin took part in.
How do I contact William Martin?
Public channels for William Martin include LinkedIn, X (Twitter) and the website linked on this profile. For a verified work email and phone number, create a free Shizune account — contact data is searched across 20+ sources and validated before delivery, so your outreach lands in the right inbox.
When did William Martin last invest?
The most recent investment recorded for William Martin closed in Sep 2025. Shizune tracks 107 investments in total for this profile, including round sizes, stages and portfolio companies, all sourced from confirmed public funding rounds and refreshed monthly.
Is Shizune's investor data accurate?
Yes — every stat on this profile is calculated from confirmed public funding rounds monitored across hundreds of sources since 2020. This profile was last refreshed in Oct 2026 and is updated monthly. Spotted something off? Use the “Suggest an edit” link near the top of the page.
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