Venture Capital

Mayfield Fund

Mayfield Fund is an early-stage venture capital firm founded in 1969 and headquartered on Sand Hill Road in Menlo Park, California, with a presence in Mumbai, India. One of the oldest continuously active Silicon Valley firms, Mayfield describes itself as "people first, from inception" and reports that roughly 70% of its investments begin at company inception, positioning it as the first institutional investor for early-stage founders. The firm invests primarily at the Seed, Series A, and Series B stages across artificial intelligence, enterprise software, cloud and cybersecurity infrastructure, semiconductors, consumer and social commerce, and human and planetary health. Mayfield reports approximately $3B in assets under management (and states it has committed $3B to AI investments), has backed more than 550 companies over its history, and counts 120+ IPOs and 225+ M&A exits including Genentech, Lyft, HashiCorp, Poshmark, Marketo, Couchbase, SolarCity, Intuitive Surgical, and Compaq. In 2023 the firm raised $955M across two new funds dedicated to early-stage investing.

143 portfolio companies 143 publish APIs here 14 properties
Venture CapitalEarly StageSeedSeries AArtificial IntelligenceEnterprise SoftwareInfrastructureSemiconductorsSilicon ValleyNorth America
Portfolio Strength across 49 profiled portfolio companies on the network
9 top-rated API companies 2 exemplar · 7 strong
18 agent-ready companies 1 agent-native · 17 agent-ready
Average quality of the book:
Composite thin 36.6
Agent-Readiness agent-aware 21.5

Firms are ranked by cumulative portfolio strength — how many highly-rated API companies they've backed, weighted by tier across composite quality and agent-readiness. The averages below are a secondary read on the typical company in the book.

Mayfield Fund has 143 portfolio companies tracked on the APIs.io network, of which 49 (34%) publish APIs indexed here. The remaining 94 are tracked as profiles without a published API on the network.

Its highest-rated API providers on the network are Outreach, Big Panda, F5, Scrunch Ai, Cubesoftware.

Portfolio on the Network

Portfolio companies that publish APIs indexed on APIs.io, grouped by their API Evangelist rating. Exemplar and Strong are expanded by default.

Exemplar 2 Complete, well-documented, and agent-ready
Strong 7 Solid coverage with minor gaps
Developing 12 Usable, with meaningful gaps to close
Thin 15 Limited public surface area
Emerging 13 Early or largely undocumented

Properties

Portfolio

Where the firm publishes its investments

Team

Partners and investing staff

Content

Blog, podcast, newsletter, and research

Firm

The firm itself

Cohort brief

Auto-generated

The 103 portfolio companies with APIs in the catalog, backed by Mayfield Fund, scored on the Kin Score. Every figure below is computed from the catalog — nothing here is written.

Providers
103
of 143 on the roster
Mean Kin Score
23.7
-0.7 vs catalog 24.4
Mean Agent Readiness
11.1
-1.6 vs catalog 12.7
Spread
2.3–73.2
median 16.7 · σ 17.8
How the 103 split by band
Exemplar 2Strong 7Developing 12Thin 18Emerging 34Minimal 30
Facet averages, against the whole catalog
FacetThis cohortCatalogDifferenceScored
Developer Ergonomics 26.5 23.8 +2.7 103
Access Clarity 28.6 27.2 +1.4 103
Contract Governance 7.4 6.6 +0.8 103
Discoverability 61.1 61.5 -0.4 103
Operational Transparency 11.4 14.4 -3 103
Contract Quality 16.6 20.4 -3.8 103

A facet is averaged over the members that carry it, not over the whole cohort — the “Scored” column is that count. Averaging an absent facet as zero would score our own coverage gaps as the providers’ posture.

What this cohort publishes
ArtifactThis cohortCatalogDifference
MCP server (any) 15% 11% +4
MCP server (first-party) 17% 13% +4
Agent Skills 0% 0% 0
OAuth scopes 13% 12% +1
Security 90% 96% -6
Arazzo workflows 1% 2% -1
Governance rules 10% 13% -3

mcp_pct counts any mcp/ artifact including ones API Evangelist derived from the provider OpenAPI; mcp_first_party_pct counts only servers the provider publishes. Prefer the latter.

Top by Kin Score
  1. 1 Outreach 73.2
  2. 2 BigPanda 69.9
  3. 3 F5 64.7
  4. 4 Scrunch AI 59.7
  5. 5 Cube 58.9
  6. 6 Couchbase 58.8
  7. 7 InfluxData 58.6
  8. 8 TrustRadius 58.4
  9. 9 Marketo 56.3
  10. 10 Basis 53.1
Top by Agent Readiness
  1. 1 Scrunch AI 56.8
  2. 2 Outreach 54.4
  3. 3 BigPanda 52.8
  4. 4 F5 49.1
  5. 5 Revefi 44.1
  6. 6 Basis 43.3
  7. 7 Alchemy 40.3
  8. 8 Lyft 37.9
  9. 9 Cube 36.4
  10. 10 InfluxData 33.2
This roster declares 143 members; 135 resolve to a provider in the catalog and 103 carry a score (76%). The figures above describe the scored members only.Generated from the catalog build of 22 September 2026, across 27674 providers, using the same computation served by the APIs.io cohort API. Briefs are published for rosters of 5 or more scored providers; below that a distribution is not meaningful.

Source (apis.yml)

apis.yml Raw ↑
aid: mayfield
name: Mayfield Fund
description: >-
  Mayfield Fund is an early-stage venture capital firm founded in 1969 and
  headquartered on Sand Hill Road in Menlo Park, California, with a presence in
  Mumbai, India. One of the oldest continuously active Silicon Valley firms,
  Mayfield describes itself as "people first, from inception" and reports that
  roughly 70% of its investments begin at company inception, positioning it as
  the first institutional investor for early-stage founders. The firm invests
  primarily at the Seed, Series A, and Series B stages across artificial
  intelligence, enterprise software, cloud and cybersecurity infrastructure,
  semiconductors, consumer and social commerce, and human and planetary health.
  Mayfield reports approximately $3B in assets under management (and states it
  has committed $3B to AI investments), has backed more than 550 companies over
  its history, and counts 120+ IPOs and 225+ M&A exits including Genentech,
  Lyft, HashiCorp, Poshmark, Marketo, Couchbase, SolarCity, Intuitive Surgical,
  and Compaq. In 2023 the firm raised $955M across two new funds dedicated to
  early-stage investing.
x-type: venture-capital
x-category: Venture Capital
deliveryModel:
  model: unknown
  open_source: false
  commercial: false
  callable_host: false
  label: Delivery model not determined — needs a product licence on record
  confidence: low
  source:
  - none
  generated: '2026-08-28'
  method: derived
accessModel:
  pricing: unknown
  onboarding: unknown
  trial: false
  try_now: false
  public: false
  label: Unknown
  confidence: low
  source: []
  generated: '2026-07-22'
  method: derived
image: https://www.mayfield.com/wp-content/uploads/2023/01/mayfield-logo.png
tags:
  - Venture Capital
  - Early Stage
  - Seed
  - Series A
  - Artificial Intelligence
  - Enterprise Software
  - Infrastructure
  - Semiconductors
  - Silicon Valley
  - North America
created: '2026-07-17'
modified: '2026-07-17'
specificationVersion: '0.23'
apis: []
common:
  - type: Website
    url: https://www.mayfield.com/
  - type: Portfolio
    url: https://www.mayfield.com/meet-our-founders/
  - type: Portfolio
    url: portfolio/mayfield-portfolio.yml
  - type: Team
    url: https://www.mayfield.com/meet-our-team/
  - type: Team
    url: team/mayfield-team.yml
  - type: InvestmentThesis
    url: https://www.mayfield.com/read-our-perspectives/
  - type: Blog
    url: https://www.mayfield.com/read-our-perspectives/
  - type: News
    url: https://www.mayfield.com/news/
  - type: Newsletter
    url: https://www.mayfield.com/newsletter/
  - type: Podcast
    url: https://www.mayfield.com/cxo-of-the-future/
  - type: Jobs
    url: https://mayfield.getro.com/
  - type: Crunchbase
    url: https://www.crunchbase.com/organization/mayfield-fund
  - type: LinkedIn
    url: https://www.linkedin.com/company/mayfield-fund/
  - type: Twitter
    url: https://twitter.com/mayfieldfund
  - type: Features
    data:
      - 'Stage: Inception, Seed, Series A, Series B'
      - 'Focus: 70% of investments begin at inception'
      - 'Sectors: artificial intelligence, enterprise software, infrastructure, cybersecurity, semiconductors, consumer/social commerce, human & planetary health'
      - 'Geography: United States (Silicon Valley), India (Mumbai)'
      - 'AUM: ~$3B (self-reported); $3B committed to AI investments'
      - '2023 fundraise: $955M across two early-stage funds'
      - 'Track record: 550+ companies, 120+ IPOs, 225+ M&As'
      - 'Founded: 1969'
      - 'HQ: Menlo Park, CA (Sand Hill Road)'
    sources:
      - https://www.mayfield.com/
      - https://en.wikipedia.org/wiki/Mayfield_(company)
      - https://www.businesswire.com/news/home/20230508005525/en/Mayfield-Raises-$955-Million-Across-Two-New-Funds-Dedicated-to-Early-Stage-Investing
    updated: '2026-07-17'
maintainers:
  - FN: Kin Lane
    email: kin@apievangelist.com
    url: https://apievangelist.com
  - FN: APIs.json
    url: http://apisjson.org
  - FN: Mayfield Fund
    url: https://www.mayfield.com/

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