Plantsea
5 known investors
Find your way into Plantsea
53 people in our graph share verified history with the Plantsea team — schools, employers, funds. One of them is your warm intro.
Olivia Foyleunlockedknows Rhiannon Rees · together at Swansea University / Prifysgol Abertawe (overlapped)
×10knows the team · via Swansea University / Prifysgol Abertawe
knows the team · via Prifysgol Aberystwyth University
PlantSea develops seaweed-based packaging materials as an alternative to single-use plastics. It targets companies seeking eco-conscious packaging solutions.
Founders & leadership
RR
Rhiannon ReesinCo-Founder & CEORhiannon Rees is co-founder and CEO of PlantSea, which develops seaweed-based packaging materials as an alternative to single-use plastics.
AN
Alex NewnessCo-Founder & COO
Investors · 5
Sustainable Ventures✓ verifiedLondon
SFC Capital✓ verifiedLondon · $127K – $381K
Angels Invest Walesreported
Innovate UKreportedLondon
Also in the syndicate · 1
Syndicate Room
Funding
SEC filings, press & company announcements- Undisclosed amountSeed RoundFeb 2026
Angels Invest Wales, Innovate UK, Sustainable Ventures, Syndicate Room
Source ↗
Source: company announcements and press reports — follow each round's link for the claim.
Companies House · registry record
View on Companies House ↗- Registered name
- PLANTSEA LTD
- Company number
- 12551709
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 8 Apr 2020
- Registered office
- Optic Technology Centre, St. Asaph Business Park, St. Asaph, LL17 0JD
- Nature of business (SIC)
- 72110 — Research and experimental development on biotechnology
- Accounts
- last made up to 30 Apr 2025 · next due 31 Jan 2027
- Confirmation statement
- last made up to 7 Apr 2026 · next due 21 Apr 2027
Current officers · 3
- Belinda Katharine Howell — director, appointed 20 Apr 2026
- Alex Timothy Newnes — director, appointed 8 Apr 2020
- Rhiannon Lynne Rees — director, appointed 8 Apr 2020
Source: Companies House public register · retrieved 16 Aug 2026. Contains public sector information licensed under the Open Government Licence v3.0.
In the news
Frequently asked questions
- What does Plantsea do?
- PlantSea develops seaweed-based packaging materials as an alternative to single-use plastics. It targets companies seeking eco-conscious packaging solutions.
- Who founded Plantsea?
- Plantsea was founded by Rhiannon Rees, Alex Newness.
- Who are Plantsea's investors?
- Plantsea's investors include Sustainable Ventures, SFC Capital, Angels Invest Wales, Innovate UK.