Sapphire Ventures

Open-source durable execution platform for building reliable distributed applications. Provides "virtual durable memory" that maintains application state across failures. Critical execution layer for AI agents in production, used by OpenAI, Anthropic, Netflix, JPMorgan Chase, Snap, Airbnb, and Stripe.

AI-powered customer communication and lead conversion platform for local businesses. Helps over 100,000 businesses manage reviews, messaging, payments, and marketing from a single dashboard. Originally founded as RepDrive, a Y Combinator W16 alumnus.

Mercury is a fintech company that provides business banking services built specifically for startups, small businesses, and scaling companies. The platform combines FDIC-insured checking and savings accounts with modern tools like cashflow analytics, intuitive dashboards, and efficient payments. Trusted by over 200,000 startups, Mercury reached $650 million in annualized revenue by Q3 2025.

Kong is the company behind the most widely adopted open-source API gateway and service connectivity platform. Originally founded as Mashape (an API marketplace), the company pivoted to focus on its open-source Kong Gateway and rebranded in 2017. Kong Konnect enables enterprises to manage, secure, and observe APIs across hybrid and multi-cloud environments.

Rain is a global stablecoin payments platform for enterprises, providing infrastructure to move, store, and use stablecoins instantly via Visa rails across 150+ countries.

Alation is the pioneer of the data catalog category, providing an agentic data intelligence platform that helps enterprises discover, govern, and trust their data assets. The platform uses AI-powered search, automated documentation, and lineage tracking. Over 40% of the Fortune 100 are customers, and the company surpassed $100M in annual recurring revenue in 2022.

Customer data infrastructure platform that collects, cleans, and routes customer data to hundreds of analytics, marketing, and data warehouse tools through a single API. Founded by four MIT students as part of Y Combinator S11.

Consumer electronics and fitness company that designed wearable activity trackers, smartwatches, and related software for tracking health metrics including steps, calories, sleep, and heart rate.