# Barnaby Weiner

> Barnaby Weiner is a seed investor at MFS Investment Management backing Health Care and iOS. See 3 investments, check sizes, portfolio. Updated Aug 2026.

- Type: Angel Investor
- Fund: [MFS Investment Management](https://shizune.co/investors/profile/mfs-investment-management)
- Location: London, United Kingdom
- Total investments: 3
- Last investment: Jul 2023
- Lead investor: 33%
- Last updated: Aug 2026
- LinkedIn: https://uk.linkedin.com/in/barnaby-wiener-0049a8a4

Barnaby Weiner is a seed investor at MFS Investment Management in London focused on Health Care and iOS. Barnaby Weiner - Portfolio Manager @ MFS Investment Management

## Round sizes

| Stage | Round size |
| --- | --- |
| Seed | $490k–$9.9M |

## Investment focus

### Industry

| Industry | Investments | Share |
| --- | --- | --- |
| Health Care | 3 | 100% |
| iOS | 1 | 33% |
| AgTech | 1 | 33% |
| Family | 1 | 33% |
| Android | 1 | 33% |

10 industries tracked in total.

### Country

| Country | Investments | Share |
| --- | --- | --- |
| United Kingdom | 2 | 67% |
| France | 1 | 33% |

## Investments

| Company | Description | Amount | Stage | Date | Website |
| --- | --- | --- | --- | --- | --- |
| Aviwell | Aviwell’s mission is to develop healthy, native, natural, and sustainable solutions to improve animal health and growth to better nourish the planet ... At a fraction of the cost. | $9.9M | Seed | Jul 18, 2023 |  |
| BelleVie | BelleVie's vision is a world where those who receive and provide support are valued and thrive. BelleVie's radically different operating model of self-managing teams was inspired by the successful Buurtzorg model of nursing in the Netherlands. Unlike other care providers who are digitising a broken operating model, BelleVie addresses theroot cause, fixing the operating model and then digitising that. | $2M | Seed | Dec 09, 2022 |  |
| TalkLife | TalkLife is a social network that’s saving lives - a mobile platform tackling the global youth mental health crisis. Talklife is fast becoming an industry innovator by embracing smartphone technology and creating a pathway that encourages youth to become transparent with their struggles in an accepting and positive environment, shining light ontaboo topics such as depression, self harm and suicide. | $490K | Seed | Oct 01, 2015 |  |

3 of 3 investments shown.

## Co-investors
- [Skagen Conscience Capital](https://shizune.co/investors/profile/skagen-conscience-capital) — VC Fund, 2 deals together
- [Elaia](https://shizune.co/investors/profile/elaia-partners) — VC Fund, 1 deal together
- [NorthInvest](https://shizune.co/investors/profile/northinvest) — VC Fund, 1 deal together
- [Northstar Ventures](https://shizune.co/investors/profile/northstar-ventures) — VC Fund, 1 deal together
- [Treebeard Trust](https://shizune.co/investors/profile/treebeard-trust) — VC Fund, 1 deal together

## About MFS Investment Management

VC Fund · Boston, United States

Massachusetts Financial Services Company is a privately owned investment manager. The firm also provides retirement planning, college planning, and education and planning services. It provides its services to investment companies, pension and profit sharing plans, corporations, pooled investment vehicles, state and municipal government entities,high net worth individuals, trusts, Taft-Hartley plans, institutions, public pension plans, corporate pension plans, bank trust clients, insurance companies, endowments, foundations, multi-employer plans, and investment advisory firms. The firm manages separate client-focused equity, fixed income, and balanced portfolios. It also manages equity, fixed income, and balanced mutual funds for its clients. The firm invests in the public equity and fixed income markets across the globe. It also invests in ADR securities to make its investments. For its equity investments, the firm typically invests in growth and value stocks of all-cap companies, including large-cap, mid-cap, and small-cap companies. It benchmarks the performance of its investments against the S&P 500 index, the various Russell indices, and the various MSCI indices. The firm benchmarks the performance of its fixed income investments against the Lehman Brothers Aggregate Index and the JP Morgan EMBI Global Index. It employs a combination of fundamental and quantitative analysis with a bottom-up stock picking and a disciplined investment approach. The firm conducts in-house research to make its investments. It was founded in 1969 and is based in Boston, Massachusetts with additional offices in Argentina, London, Mexico, Australia, Japan, and Singapore. Massachusetts Financial Services Company operates as a subsidiary of Sun Life Financial, Inc.

3 contacts available at MFS Investment Management.

| Name | Title | Profile |
| --- | --- | --- |
| Barnaby Weiner | Portfolio Manager | https://shizune.co/investors/profile/barnaby-weiner |
| Ashton L. Carr | Founder | https://shizune.co/investors/profile/ashton-l-carr |
| Matt Sweeney | Vice President; Director of Investment Operations | https://shizune.co/investors/profile/matt-sweeney-1ed8 |

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## Featured in investor lists
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## FAQ

### What does Barnaby Weiner invest in?

Barnaby Weiner invests primarily in Health Care, iOS and AgTech startups, most often at Seed stage. Most of the 3 investments tracked by Shizune back companies in United Kingdom. The Investment Focus section breaks down every industry, stage and country in the portfolio.

### What is Barnaby Weiner's check size?

Barnaby Weiner typically joins rounds of $490k–$9.9M at Seed. These ranges are 10th–90th percentile round sizes calculated from confirmed public funding rounds, so they are a realistic guide to the rounds Barnaby Weiner participates in.

### When did Barnaby Weiner last invest?

The most recent investment recorded for Barnaby Weiner closed in Jul 2023. Shizune tracks 3 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 Aug 2026 and is updated monthly. Spotted something off? Use the “Suggest an edit” link near the top of the page.

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