JamJar Investments

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Investment Portfolio

Shellworks raises £11m Series A led by Alter Equity for biodegradable packaging made from microbial fermentation

4 Mar 2026

Shellworks raises £11m Series A led by Alter Equity for biodegradable packaging made from microbial fermentation

Shellworks produces biodegradable materials made using microbial fermentation as an alternative to conventional plastic packaging. Its material, Vivomer, is designed to remain stable in use but fully biodegrade after disposal for consumer brands seeking alternatives to petroleum-based packaging.

Tewke

24 Feb 2026

Tewke unlocks £1.5m in funding from VC investors to redefine energy optimisation with home hardware automation

Tewke builds home automation hardware that helps households manage electricity use and improve energy efficiency. Its flagship product is a retrofit light switch that guides users to shift energy consumption based on tariffs and home conditions.

Marleybones

30 Oct 2025

Marleybones secures £2.5m funding led by TAW Ventures to redefine premium dog dining with its "Pantry Fresh" meals

Marleybones produces fresh, slow-cooked dog food and supplements made in the UK, supplying both direct-to-consumer and retail channels with nutritionally complete meals packaged in recyclable cartons.

Sava

31 Jul 2025

Sava raises £14m Series A led by Balderton and Pentland Venture to pioneer real-time biosensing for diabetes care

Sava develops a wearable biosensing platform that monitors glucose and other biomarkers in real time, using a pain-free microsensor designed to expand access to continuous health monitoring.

JamJar Investments