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.
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
Firm
The firm itself
Cohort brief
Auto-generatedThe 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.
| Facet | This cohort | Catalog | Difference | Scored |
|---|---|---|---|---|
| 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.
| Artifact | This cohort | Catalog | Difference |
|---|---|---|---|
| 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.
- 1 OpenAI 82.9
- 2 Anthropic 77.8
- 3 LinkedIn 73.8
- 4 Cloudera 68.3
- 5 Lightfield 66.8
- 6 Instagram 65.4
- 7 Postscript 65.4
- 8 Censys 65.2
- 9 Common Room 65
- 10 Gladly 62.9
- 1 Lightfield 65.6
- 2 Builder.io 64.2
- 3 Common Room 63.8
- 4 Chronosphere 56.6
- 5 AirOps 55.3
- 6 Figma 54.7
- 7 Opal Security 51.8
- 8 Braintrust 49.6
- 9 Revolut 49.2
- 10 OpenAI 48.1
Source (apis.yml)
Work with this as data
Every firm here is available over the APIs.io API and to AI agents over MCP.