Lombardstreet Ventures Review: The Data-Driven Seed Fund Backed by Y Combinator Alumni
Everything you need to know about Lombardstreet Ventures: their investment thesis, notable portfolio companies, typical check size, and how to position your startup for funding.
If you're building a seed-stage company with strong founders and a compelling vision, Lombardstreet Ventures should be on your radar. They're a San Francisco-based seed fund that has backed over 100 companies, including several unicorns.
Founded by Y Combinator alumni, Lombardstreet Ventures takes a data-driven approach to early-stage investing. They're known for making quick decisions and backing founders with unique insights, rather than following thematic trends.
In this guide, we'll cover what Lombardstreet Ventures looks for, their investment criteria, notable portfolio companies, and how to position your startup to catch their attention.
Investment Focus & Thesis
Lombardstreet Ventures focuses on seed-stage companies with strong founding teams. Their thesis centers on backing unique, compelling founders with the ability to execute, regardless of the sector.
Stage Focus
Seed stage, typically first institutional round. They invest $250K-$1M per company.
Check Size
$250K to $1M per investment, typically targeting companies with less than $1.5M raised.
Lombardstreet Ventures invests broadly across technology sectors:
- AI & Machine Learning — AI applications, developer tools, and infrastructure
- Fintech — Financial services, payments, and banking infrastructure
- Healthtech — Digital health, wellness, and healthcare technology
- Deep Tech & Aerospace — Advanced hardware, aerospace, and defense technology
- Climate & Sustainability — Climate tech, food tech, and sustainability solutions
- SaaS & Enterprise — Business software and productivity tools
Recent Investment Activity
Lombardstreet Ventures has remained active in 2025 and 2026, continuing their focus on strong teams. Recent investments include:
| Company | Sector | Round | Year |
|---|---|---|---|
| Browser Use | AI / DevTools | Seed | 2026 |
| Mastra | AI / DevTools | Seed | 2025 |
| Exa | AI / Infrastructure | Seed | 2025 |
| Stellar Sleep | Healthtech | Seed | 2025 |
The firm is known for making quick, decisive investments and has backed several companies through multiple rounds.
Notable Portfolio Companies
Lombardstreet Ventures' portfolio includes over 100 companies, including several unicorns. Here are some notable ones:
Notion
The all-in-one workspace now valued at billions with over 100 million users. Lombardstreet was an early investor.
Brex
The corporate expense management platform that revolutionized business spending. Now a decacorn.
CoreWeave
AI cloud infrastructure company valued at billions as the AI boom continues.
Calm
The meditation and sleep app became a unicorn and one of the most popular wellness apps globally.
Filecoin
The decentralized storage network became a major player in the blockchain space.
Additional portfolio companies include IronGrid, Sygaldry, H3X, Albedo, Ember Robotics, Wicked Kitchen, Terraformation, and many more across AI, climate, and deep tech.
What Lombardstreet Ventures Looks For
Based on public statements and their investment patterns, here's what Lombardstreet Ventures typically evaluates:
- Strong founding teams — They invest heavily in people. Strong founders with domain expertise get priority.
- Unique insights — They look for founders with unique perspectives or unfair advantages.
- Market timing — They seek large, evolving markets where new approaches can create significant value.
- Execution ability — They want to see founders who can ship fast and iterate.
- Thematic flexibility — Unlike trend-following funds, they invest across sectors based on team quality.
Pro Tip
Lombardstreet Ventures is known for making quick decisions. They've publicly stated they back people over ideas, so focus your pitch on your team's unique capabilities and past execution.
How to Connect With Lombardstreet Ventures
Getting a meeting with Lombardstreet Ventures requires a strong pitch and network connections. Here's what we recommend:
Leverage Your Network
Warm introductions from founders they've backed, YC alumni, or other VCs can help get noticed.
Apply Through YC Channels
Given their YC roots, connections through the YC community can be valuable.
Show Early Traction
Even at seed stage, any traction — early users, revenue, partnerships — helps differentiate your pitch.
Be Ready to Move Fast
Lombardstreet is known for quick decisions. Be prepared to move fast if they're interested.
The Value of Financial Preparedness
While Lombardstreet Ventures invests in early-stage companies, they still expect founders to have a handle on their financials. This is where many first-time founders struggle — and where bringing in fractional CFO support can make a significant difference.
Why Investors Care
- • Demonstrates business acumen
- • Shows you understand unit economics
- • Enables smarter decision-making
- • Speeds up due diligence
What You Need
- • Clear financial model with assumptions
- • Understanding of burn rate and runway
- • Realistic projections for growth
- • Capital efficiency metrics
How Eagle Rock Helps
We help seed-stage companies build financial infrastructure that impresses investors. From pitch deck financials to runway analysis, our fractional CFO services ensure you're ready for due diligence. We also have relationships with investors across the VC ecosystem and can make introductions when the time is right.
Ready to Strengthen Your Fundraising Deck?
Whether you're preparing to pitch Lombardstreet Ventures or other top VCs, having professional financials can set you apart. Our team has helped companies raise over $200M in venture capital.
Schedule a Free ConsultationRelated VC Reviews
Exploring other venture capital firms? Check out our other in-depth reviews.