26 London Mempool companies backed by Octopus Ventures

Pet insurance provider, formerly Bought By Many, selling cover for dogs and cats in the UK.

Peer-to-peer fashion resale app where people buy and sell secondhand clothing, now owned by eBay.

AI tools that help lawyers draft, review and understand complex contracts, used by Magic Circle and top US law firms.

AI agents that handle customer support, compliance and back-office operations for banks and fintechs.

Robotic lab automation platform that runs life-science experiments end to end for pharma and biotech labs.

Builds non-invasive bedside devices that monitor brain blood flow and pressure in critically ill patients.

Practice management and electronic health record platform for private outpatient healthcare providers.

Smart thermostat and data platform helping social housing providers spot cold, damp and mould in homes.

Account-to-account payment infrastructure that lets banks, fintechs and payment companies offer Pay by Bank, variable recurring payments and payouts through one API.

Customer data and marketing platform for retail brands that personalises messages across email, SMS, ads and other channels.

Uses machine learning and robotic labs to design multispecific antibody drugs for solid tumours.

Sharing app where neighbours and volunteers give away surplus food and household items for free, including collections from supermarket partners.

Referral and customer advocacy platform that lets brands run refer-a-friend programmes and track the customers they bring in.

HelloSelf matches people with accredited therapists and coaches for online sessions, with an AI companion tool used between sessions.

Online dermatology service that prescribes personalised skincare treatments for acne and ageing, delivered by monthly subscription.

Resolutiion is an AI platform that spots commercial dispute and delivery risk in large contracts for defence, energy and manufacturing firms.

Seatfrog is an app for buying train tickets, bidding on first class upgrades and changing train times with partner rail operators.

Technology-enabled trade credit insurance and non-payment guarantees that protect company receivables against buyer default.

Emissions and sustainability data for cloud and AI infrastructure, helping IT teams cut carbon and cost.

Kita is a Lloyd's coverholder that sells insurance against delivery, failure and political risk for carbon and natural capital projects.

Builds photonic quantum computers that run in normal data centres alongside AI and HPC systems.

Makes IRO, an automated closed-system platform for manufacturing cell and gene therapies from R&D through commercial production.

AI biology lab that builds foundation models from its own data to diagnose and treat brain disease.

Makes adsorbent materials that capture PFAS forever chemicals from water.

Neurosymbolic AI that gives precise, explainable yes-or-no decisions for banks, insurers and accountants.

Makes an engineering-grade AR headset and platform that lets builders check work against design models on site.