Sierra Ventures
SIERRA Ventures is an early-stage venture capital firm located in San Mateo, California. Founded in 1982, it has over four decades of experience in investing in enterprise and emerging technologies, focusing on companies from inception through Series A funding. The firm manages over $2 billion in assets, with its current fund, Fund XII, totaling approximately $265 million. The firm specializes in early-stage investments, primarily targeting B2B enterprise software, SaaS, artificial intelligence, cybersecurity, and cloud infrastructure. SIERRA Ventures typically invests between $500,000 and $7
Investing activity
Sierra Ventures appears in 6 AI deals tracked by the AI Lounge deals desk, rounds totalling $34M, and led 3 of them. The rounds are mostly Seed and Series A, with a median round size of $8M and the largest at $17M. The most recent are Thrixel (Seed, $3M, Oct 2026), Siena (Series A, $17M, Oct 2026) and Aristotle (Seed, $5M, Sep 2026).
Sierra Ventures most often invests alongside Jon Barron, MFV Partners, Z5 Capital and Matt Bilbey, and the companies it backs on AI Lounge are mostly in AI and AI agents / customer experience.
Deals
Frequently asked questions about Sierra Ventures
What AI companies has Sierra Ventures invested in?
Sierra Ventures's AI investments include Thrixel, Siena, Aristotle, Smallest.ai, BAND and Expert Intelligence. The 6 rounds on AI Lounge are listed on this page with amounts, dates and co-investors.
Where is Sierra Ventures based?
Sierra Ventures is based in San Mateo, California, United States.
What stage does Sierra Ventures invest at?
In the rounds tracked on AI Lounge, Sierra Ventures has invested at Seed and Series A, with a median round of $8M. Sierra Ventures led 3 of those rounds.
Who does Sierra Ventures co-invest with?
Sierra Ventures's most frequent co-investors on AI Lounge are Jon Barron (1 deal), MFV Partners (1 deal), Z5 Capital (1 deal), Matt Bilbey (1 deal) and Harper Court Ventures (1 deal).
How can founders reach Sierra Ventures?
Founders on AI Lounge can see Sierra Ventures's contact details in AI Investor Contacts (paid plans), check for a warm introduction through members who worked with the firm under Warm Paths, and add Sierra Ventures to their Investor Pipeline to track the conversation.