# David Castle

> David Castle is a seed investor in Chelmsford backing Software and FinTech. See 7 investments, round sizes, portfolio and contact details. Updated Oct 2026.

- Type: Angel Investor
- Location: Chelmsford, United Kingdom
- Total investments: 7
- Last investment: Jun 2017
- Lead investor: 0%
- Last updated: Oct 2026
- LinkedIn: https://www.linkedin.com/in/davidcastle

David Castle is a seed investor in Chelmsford focused on Software and FinTech. David Castle

## Contacts

5 contacts available for David Castle: work email, personal email, work phone, personal phone and socials. Sign up free to unlock them: https://app.shizune.co/sign-up/investor-profiles/find-email/david-castle?utm_source=investor_profile

## Investment focus

### Industry

| Industry | Investments | Share |
| --- | --- | --- |
| Software | 3 | 43% |
| FinTech | 2 | 29% |
| Cyber Security | 2 | 29% |
| Financial Services | 2 | 29% |
| Information Technology | 2 | 29% |

21 industries tracked in total.

### Stage

| Stage | Investments | Share |
| --- | --- | --- |
| Seed | 5 | 71% |
| Angel | 1 | 14% |

### Country

| Country | Investments | Share |
| --- | --- | --- |
| United Kingdom | 5 | 71% |
| United States | 1 | 14% |

## Investments

| Company | Description | Round size | Stage | Date | Website |
| --- | --- | --- | --- | --- | --- |
| Simudyne | Simudyne helps financial organisations to understand their world and make the best possible decisions.Simudyne is a simulation technology company that offers organizations a new way to more effectively harness the power of agent-based modeling, AI and machine learning to test drive their decisions and drive growth. Simudyne’s clients includeglobal banks, regulators and exchanges.Founded by simulation expert Justin Lyon in 2016, Simudyne graduated from the Barclays TechStars programme in 2017 and Mastercard Start Path in 2018. We have since expanded rapidly with a team of first-class talent, including PhDs with a wealth of expertise in financial services and beyond. | $759K | Seed | Jun 01, 2017 | https://www.simudyne.com |
| Polly Portfolio | Polly Portfolio is an automated investment platform that provides individual investors with professional-grade tools and institutional experience to build customized portfolios. This platform offers institutional-grade investment technology, automatic portfolio adjustments as data changes, and strategic insight into market and portfolio behavior.Its managed account service costs 0.35–0.55% per year. | $245K | Seed | Jan 31, 2017 | https://www.pollyport.com |
| Barac | Barac is an advanced streaming analytics platform helping businesses and organisations take real time decisions. |  | Seed | Jan 01, 2017 | http://www.barac.io/ |
| Flatzapp Ltd | Flatzapp provides data and technology solutions in real estate |  | Angel | Oct 15, 2015 | http://www.flatzapp.com |
| Polly Portfolio | Polly Portfolio is an automated investment platform that provides individual investors with professional-grade tools and institutional experience to build customized portfolios. This platform offers institutional-grade investment technology, automatic portfolio adjustments as data changes, and strategic insight into market and portfolio behavior.Its managed account service costs 0.35–0.55% per year. | $2.1M | Seed | Dec 01, 2014 | https://www.pollyport.com |
| Pushfor | Pushfor is a secure content sharing and instant messaging platform, designed for enterprises, that converts and projects content in high fidelity to any device. We have a patented smart approach to delivering content of any type or size - whereby the content is not sent to the device but ‘pushed’ in real time without the file leaving its sourcelocation. Content delivery is highly secure and tightly controlled with customizable viewing permissions combined with real-time tracking, full audit trail and usage analytics. Users have immediate and easy access, and can interactively engage with content by instant chat messaging, anytime, anywhere from their preferred device and without the need of any authoring software. | $1.2M | Seed | Jan 20, 2014 | http://www.pushfor.com |
| Biodexa Pharmaceuticals | Biodexa Pharmaceuticals is an international specialty pharmaceutical company focused on oncology and other therapeutic areas with a commercial platform and four marketed products in the US. Midatech's strategy is to develop products in-house in oncology and with partners in other indications, and to accelerate growth organically and throughstrategic acquisitions. | $196K | Seed | Sep 01, 2013 | https://www.biodexapharma.com |

7 of 7 investments shown.

## Co-investors
- [Techstars](https://shizune.co/investors/profile/barclays-accelerator) — VC Fund, 1 deal together
- [Techstars](https://shizune.co/investors/profile/techstars) — VC Fund, 1 deal together

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## FAQ

### What does David Castle invest in?

David Castle invests primarily in Software, FinTech and Cyber Security startups, most often at Seed and Angel stage. Most of the 7 investments tracked by Shizune back companies in United Kingdom. The Investment Focus section breaks down every industry, stage and country in the portfolio.

### How do I contact David Castle?

Public channels for David Castle include LinkedIn. 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 David Castle last invest?

The most recent investment recorded for David Castle closed in Jun 2017. Shizune tracks 7 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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