VC fund profile · evidence-aware directory data
Y Combinator stages, portfolio and investment profile
Y Combinator is a San Francisco startup accelerator founded in 2005. It runs winter, spring, summer, and fall batches and invests a standard $500K through two SAFEs: $125K for 7% plus $375K on an uncapped MFN SAFE.
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Stage-based planning range
$250K–$3M
This is a planning range inferred from stage coverage, not a firm-disclosed check size.
Methodology: Stage bucket inferred from the rounds a fund leads or invests in.
No firm-specific check-size disclosure is recorded.
Investment stages
Leads: Pre-Seed, Seed
Participates: Pre-Seed, Seed, Series A
Sector focus
Not recorded
Geography
San Francisco, CA
Founded 2005
Fund size / AUM
Not recorded
A separate fund-size evidence record is not yet available.
Portfolio in our directory
27
Linked startup profiles
Recent tracked investment
Not recorded
No dated round explicitly links this fund.
Rounds they lead
Rounds they invest
Last verified: Not recorded. Check-size evidence is labeled by basis so planning estimates are not presented as firm disclosures.
Portfolio companies we track
Startups in our directory that list Y Combinator as an investor (24 total).
- Adaptyv YC S21 automated wet lab that synthesizes and tests AI-designed proteins and returns experimental data.
- AfterQuery Expert datasets and RL environments that encode how doctors, lawyers, and other practitioners actually work, sold to frontier AI labs.
- Ajaib Indonesia multi-asset investment platform spanning equities, crypto, stablecoins, FX, and payments.
- Apollo Atomics Factory-built, truck-transportable compact pressurized water reactors aimed at AI data centers, industry, and utilities.
- Blacksmith Managed computing infrastructure for building and testing software, including code produced by AI agents.
- Blee NYC AI marketing-compliance platform — $20M Series A co-led by Fin Capital and SMBC Fin Atlas; $27M is lifetime, not this round.
- Clerky YC S11 legal-paperwork platform for high-growth startups and the attorneys who represent them.
- Conveo AI consumer research and intelligence platform for enterprise product, marketing, and strategy teams.
- Frontier Computing Grows lab-cultured neural tissue as a machine-learning substrate — wetware, not another GPU neocloud.
- Greptile AI software that reviews proposed code changes before they merge into a shared codebase.
- HappyRobot Agentic AI platform that builds, deploys, and manages enterprise agents across voice, email, documents, and web — starting in logistics ops.
- Herdr YC terminal runtime for AI agents — $6M seed led by Bessemer; YC and e2vc participated; no valuation.
- Hubble Network Bluetooth-to-satellite connectivity for low-power IoT devices.
- Infisical Security infrastructure for managing credentials, certificates and access for people, machines and AI agents.
- Metriport Open-source healthcare data infrastructure for point-of-care patient context and clinical AI agents.
- Molagri Toronto biotech developing modular biological crop protection for specific insect pests.
- Multiplier (Asset Managers) Firm-specific AI agent harnesses deployed inside asset managers’ own systems.
- Pennant AI-assisted proxy-voting research and governance workflows for institutional investors.
- Probably Genetic Patient-identification and rare-disease data platform connecting testing pathways with institutional research needs.
- Readily Healthcare compliance intelligence linking regulatory changes to accountable actions and evidence.
- Sirdab YC W23 Riyadh cloud-warehousing platform — $10M Series A co-led by Elm and BECO; company says profitable.
- Starcloud Orbital data-center satellites for AI inference, starting with an Nvidia H100 in space.
- Stoke Space Fully reusable medium-lift rocket (Nova) targeting 100% first- and second-stage reuse from Kent, Washington.
- Thunder Compute GPU virtualization software — “VMware for GPUs” — so enterprises and clouds can reclaim idle accelerator capacity.
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