Mayfield
About Mayfield
Mayfield was founded in 1969 by Thomas J. Davis Jr. and Wally Davis, who were not related. The firm is based on Sand Hill Road in Menlo Park, and Navin Chaddha is listed as its managing partner. PitchBook lists 11 professionals. The firm's LinkedIn page reports about $3 billion under management and more than 550 investments, which it says produced 120 IPOs and more than 225 acquisitions. In 2023 Mayfield announced $955 million across two funds.
Mayfield describes its current focus as AI-first, deeptech, and human and planetary health companies. In 2023 it launched a $250 million AI seed-stage initiative using existing capital. Crunchbase lists AI among its sectors, with attention to applications, data infrastructure, and underlying technologies. Lounge's deals desk records Mayfield as lead on recent AI rounds: Rhoda AI's $450M Series A (March 2026), and seed or pre-seed rounds for Multiply, Kana, Pensieve, Pensive, Hang Ten Systems (June 2026), and Hello Haven (September 2026).
Mayfield's public profiles list Seed, Series A, and Series B as its stages. PitchBook classes the firm as a venture investor that is actively seeking new investments. Check sizes are not published in the sources reviewed.
- Rhoda AI: Series A, $450M, March 2026, Mayfield led (per Lounge deals desk)
- Multiply: Seed, $9.5M, March 2026, Mayfield led (per Lounge deals desk)
- Kana: Seed, $15M, February 2026, Mayfield led (per Lounge deals desk)
- Pensieve: Seed, $6.9M, February 2026, Mayfield led (per Lounge deals desk)
- Pensive: Seed, $6.8M, July 2026, Mayfield led (per Lounge deals desk)
- Hang Ten Systems: Seed, $32M, June 2026, Mayfield led (per Lounge deals desk)
- Hello Haven: Pre-seed, $15M, September 2026, Mayfield led (per Lounge deals desk)
Investing activity
Mayfield appears in 9 AI deals tracked by the AI Lounge deals desk, rounds totalling $565M, and led 7 of them. The rounds are mostly Seed, Pre-seed and Series A, with a median round size of $15M and the largest at $450M. The most recent are Hello Haven (Pre-seed, $15M, Sep 2026), Hang Ten Systems (Seed, $53M, Sep 2026) and Pensive (Seed, $6.8M, Jul 2026).
Mayfield most often invests alongside Aramco Ventures, Karim Atiyeh, Bass Investment and Reach Capital, and the companies it backs on AI Lounge are mostly in AI and Robotics foundation models.
Deals
Frequently asked questions about Mayfield
When was Mayfield founded and by whom?
Mayfield was founded in 1969 by Thomas J. Davis Jr. and Wally Davis. The firm is based in Menlo Park, California.
How much capital does Mayfield manage?
Mayfield's LinkedIn page reports about $3 billion under management. The firm announced $955 million across two funds in 2023.
Does Mayfield invest in AI seed startups?
Yes. Mayfield launched a $250 million AI seed-stage initiative in 2023, and Lounge's deals desk lists several AI seed rounds it led in 2026.
What stages does Mayfield invest in?
Mayfield's public profiles list Seed, Series A, and Series B. Check sizes are not published in the sources reviewed.
Where can founders find Mayfield's portfolio?
The firm's portfolio is listed on its website at mayfield.com and on PitchBook. Its LinkedIn page names notable investments including HashiCorp, Lyft, and Mammoth Biosciences.
What AI companies has Mayfield invested in?
Mayfield's AI investments include Hello Haven, Hang Ten Systems, Pensive, Multiply, Rhoda AI, Pensieve, Kana and Entelligence AI. The 9 rounds on AI Lounge are listed on this page with amounts, dates and co-investors.
Where is Mayfield based?
Mayfield is based in Menlo Park, US.
What stage does Mayfield invest at?
In the rounds tracked on AI Lounge, Mayfield has invested at Seed, Pre-seed and Series A, with a median round of $15M. Mayfield led 7 of those rounds.
Who does Mayfield co-invest with?
Mayfield's most frequent co-investors on AI Lounge are Aramco Ventures (2 deals), Karim Atiyeh (2 deals), Bass Investment (2 deals), Reach Capital (2 deals) and Anti Fund (2 deals).
How can founders reach Mayfield?
Founders on AI Lounge can see Mayfield'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 Mayfield to their Investor Pipeline to track the conversation.