Mayfield Fund is a venture capital firm founded in 1969, based in Menlo Park, California. It is an early-stage VC firm that invests primarily in AI, enterprise software, cybersecurity, developer tools, healthcare, and hardware & semiconductors, with 70% of investments made at inception.
Average disclosed round size is $47.6M (across 280 rounds with reported amounts).
Portfolio
180
Fund Size
$250M
Top Stage
Series A
Last 12 Mo
15
Portfolio Breakdown
Stage Distribution
Sector Distribution
Investment Activity
DealsAvg Round Size
Portfolio
311 investments
| Company | Round | Amount | Date |
|---|---|---|---|
 Lumilens | Seed | $700M | Aug 2026 |
 OpenLight | Unknown | $50M | Apr 2026 |
 Neubird AI: | Series A | $19.3M | Apr 2026 |
 Frore Systems | Series D | $143M | Mar 2026 |
 Rhoda AI | Series D | — | Mar 2026 |
 Upscale AI | Series A | $200M | Jan 2026 |
 Entelligence AI | Seed | $5M | Jan 2026 |
 Multiply | Series A | $9.5M | Jan 2026 |
 Velaura | Series A | $110M | Jan 2026 |
 Bespoke Labs | Series A | $40M | Jan 2026 |
 CogniChip | Series A | $60M | Jan 2026 |
| Lumilens | Series C | $700M | Jan 2026 |
 Pensive | Seed | $6.8M | Jan 2026 |
 Upscale Ai | Series A | $190M | Jan 2026 |
 Multiply | Unknown | $9.5M | Jan 2026 |
| OpenLight | Unknown | $50M | Jan 2026 |
 Opti | Seed | $20M | Nov 2025 |
 Uare.ai | Seed | $10.3M | Nov 2025 |
 Inception | Seed | $50M | Nov 2025 |
 Obot | Seed | $35M | Sep 2025 |
 Numeral | Series B | $35M | Sep 2025 |
| Upscale AI | Seed | $100M | Sep 2025 |
| Upscale Ai | Seed | $100M | Sep 2025 |
 ProRata AI | Series B | — | Sep 2025 |
| OpenLight | Series A | $34M | Aug 2025 |
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Top Co-Investors
Khosla Ventures17 shared
StepStone Group17 shared
Qualcomm Ventures15 shared
Y Combinator14 shared
M1214 shared
GGV Capital14 shared
Sapphire Ventures14 shared
Trinity Ventures14 shared
Techstars14 shared
True Ventures13 shared
MVP Ventures13 shared
Battery Ventures13 shared
Menlo Ventures12 shared
Accel11 shared
Insight Partners11 shared
Redpoint Ventures11 shared
Celesta Capital11 shared
Sequoia Capital11 shared
Intel Capital10 shared
Tiger Global Management, LLC10 shared
Last updated: 27 September 2026