Venture Capital

Greylock Partners

Greylock Partners is one of the oldest and best-known venture capital firms in the United States, founded in 1965 in Cambridge, Massachusetts and headquartered in Menlo Park, California. Greylock is an early-stage-focused firm that partners with founders at the pre-seed, seed, and Series A stages, deploying the majority of its capital as a first check and continuing to back companies through Series B and beyond. The firm reports over $3.5 billion in committed capital under management. Greylock invests across enterprise and consumer software with an explicitly AI-first thesis, concentrating on applications, infrastructure, cybersecurity, fintech, consumer, and deep tech. Its portfolio and alumni network includes category-defining companies such as LinkedIn, Facebook, Airbnb, Workday, Palo Alto Networks, Cloudera, Coinbase, Figma, Discord, and Anthropic. Partners include Reid Hoffman, Asheem Chandna, Saam Motamedi, Jerry Chen, David Sze, and Mike Duboe.

157 portfolio companies 157 publish APIs here 13 properties
Venture CapitalSeedSeries AArtificial IntelligenceEnterprise SoftwareCybersecurityFintechInfrastructureSilicon Valley
Portfolio Strength across 90 profiled portfolio companies on the network
19 top-rated API companies 5 exemplar · 14 strong
37 agent-ready companies 6 agent-native · 31 agent-ready
Average quality of the book:
Composite thin 39.8
Agent-Readiness agent-aware 24.9

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.

Greylock Partners has 157 portfolio companies tracked on the APIs.io network, of which 90 (57%) publish APIs indexed here. The remaining 67 are tracked as profiles without a published API on the network.

Its highest-rated API providers on the network are OpenAI, Anthropic, LinkedIn, Cloudera, Lightfield.

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 5 Complete, well-documented, and agent-ready
Strong 14 Solid coverage with minor gaps
Developing 26 Usable, with meaningful gaps to close
Thin 31 Limited public surface area
Emerging 12 Early or largely undocumented
Minimal 2 Almost no public developer surface

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 139 portfolio companies with APIs in the catalog, backed by Greylock Partners, scored on the Kin Score. Every figure below is computed from the catalog — nothing here is written.

Providers
139
of 157 on the roster
Mean Kin Score
31.2
+6.8 vs catalog 24.4
Mean Agent Readiness
17.4
+4.7 vs catalog 12.7
Spread
5–82.9
median 29.5 · σ 18.8
How the 139 split by band
Exemplar 5Strong 14Developing 26Thin 33Emerging 38Minimal 23
Facet averages, against the whole catalog
FacetThis cohortCatalogDifferenceScored
Developer Ergonomics 32.5 23.8 +8.7 139
Access Clarity 35.7 27.2 +8.5 139
Contract Quality 28.1 20.4 +7.7 139
Operational Transparency 20.4 14.4 +6 139
Contract Governance 9.8 6.6 +3.2 139
Discoverability 63.7 61.5 +2.2 139

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) 17% 11% +6
MCP server (first-party) 24% 13% +11
Agent Skills 0% 0% 0
OAuth scopes 18% 12% +6
Security 97% 96% +1
Arazzo workflows 6% 2% +4
Governance rules 21% 13% +8

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 OpenAI 82.9
  2. 2 Anthropic 77.8
  3. 3 LinkedIn 73.8
  4. 4 Cloudera 68.3
  5. 5 Lightfield 66.8
  6. 6 Instagram 65.4
  7. 7 Postscript 65.4
  8. 8 Censys 65.2
  9. 9 Common Room 65
  10. 10 Gladly 62.9
Top by Agent Readiness
  1. 1 Lightfield 65.6
  2. 2 Builder.io 64.2
  3. 3 Common Room 63.8
  4. 4 Chronosphere 56.6
  5. 5 AirOps 55.3
  6. 6 Figma 54.7
  7. 7 Opal Security 51.8
  8. 8 Braintrust 49.6
  9. 9 Revolut 49.2
  10. 10 OpenAI 48.1
This roster declares 157 members; 149 resolve to a provider in the catalog and 139 carry a score (93%). 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: greylock.com
name: Greylock Partners
description: Greylock Partners is one of the oldest and best-known venture capital firms in the United
  States, founded in 1965 in Cambridge, Massachusetts and headquartered in Menlo Park, California. Greylock
  is an early-stage-focused firm that partners with founders at the pre-seed, seed, and Series A stages,
  deploying the majority of its capital as a first check and continuing to back companies through Series
  B and beyond. The firm reports over $3.5 billion in committed capital under management. Greylock invests
  across enterprise and consumer software with an explicitly AI-first thesis, concentrating on applications,
  infrastructure, cybersecurity, fintech, consumer, and deep tech. Its portfolio and alumni network includes
  category-defining companies such as LinkedIn, Facebook, Airbnb, Workday, Palo Alto Networks, Cloudera,
  Coinbase, Figma, Discord, and Anthropic. Partners include Reid Hoffman, Asheem Chandna, Saam Motamedi,
  Jerry Chen, David Sze, and Mike Duboe.
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://cdn.sanity.io/images/uz672vkd/production/3289769f5f58045123dd9132f64e768dda4e74aa-168x32.svg
x-type: venture-capital
x-category: Venture Capital
tags:
- Venture Capital
- Seed
- Series A
- Artificial Intelligence
- Enterprise Software
- Cybersecurity
- Fintech
- Infrastructure
- Silicon Valley
created: '2026-07-17'
modified: '2026-07-17'
specificationVersion: '0.23'
apis: []
common:
- type: Website
  url: https://greylock.com/
- type: Portfolio
  url: https://greylock.com/portfolio/
- type: Portfolio
  url: portfolio/greylock-portfolio.yml
- type: Team
  url: https://greylock.com/team/
- type: Team
  url: team/greylock-team.yml
- type: InvestmentThesis
  url: https://greylock.com/firm/
- type: Blog
  url: https://greylock.com/blog/
- type: News
  url: https://greylock.com/edge/
- type: Podcast
  url: https://greylock.com/greymatter/
- type: Jobs
  url: https://greylock.com/jobs/
- type: Crunchbase
  url: https://www.crunchbase.com/organization/greylock
- type: LinkedIn
  url: https://www.linkedin.com/company/greylock-partners/
- type: Twitter
  url: https://x.com/GreylockVC
- type: Features
  data:
  - 'Stage: Pre-seed, Seed, Series A (first-check, early-stage focus; follows on through Series B+)'
  - 'Sectors: applications, infrastructure, cybersecurity, fintech, consumer, deep tech'
  - 'Geography: United States (Silicon Valley / Menlo Park)'
  - 'AUM: over $3.5B committed capital (self-reported)'
  - 'Founded: 1965 (Cambridge, MA)'
  - 'HQ: Menlo Park, CA'
  - 'Thesis: AI-first; backs category-defining teams'
  - 'Portfolio: 158 companies profiled from greylock.com/portfolio'
  sources:
  - https://greylock.com/firm/
  - https://en.wikipedia.org/wiki/Greylock_Partners
  - https://www.crunchbase.com/organization/greylock
  updated: '2026-07-17'
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
  url: https://apievangelist.com
- FN: APIs.json
  url: http://apisjson.org
- FN: Greylock Partners
  url: https://greylock.com/

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