Kleiner Perkins
Kleiner Perkins is one of Silicon Valley's oldest and most storied venture capital firms, founded in 1972 by Eugene Kleiner and Tom Perkins and headquartered on Sand Hill Road in Menlo Park, California, with additional offices in San Francisco and Shanghai. Across more than five decades and 21 venture funds plus 6 growth funds, the firm has invested over $10 billion and backed more than 900 ventures, including foundational companies such as Amazon, Google, Genentech, Electronic Arts, Juniper Networks, Intuit, Spotify, Figma, Robinhood, DoorDash, Duolingo and Databricks. Kleiner Perkins partners with founders from inception through IPO and beyond across early and growth stages, with seed rounds averaging roughly $4-5M and Series A rounds around $17-18M. In 2026 the firm announced its twenty-second venture fund, KP22, a $1B early-stage fund, alongside $2.5B in new growth funds. Current investment focus centers on artificial intelligence and AI safety, enterprise software, developer tools and infrastructure, healthcare and biotech, fintech, hardtech and autonomous systems, and cybersecurity, with a thesis that the right idea, team and partners can create an entirely new industry.
A small book with the densest top end measured in this series, where every exemplar is a frontier AI or design-infra bet and the mature franchises ship breadth but no agent surface.
Kleiner Perkins has 230 portfolio companies tracked on the APIs.io network, of which 230 (100%) publish APIs indexed here.
Its highest-rated API providers on the network are Anthropic, Arcade, Fal, Parallel, Instacart.
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.
Strong 13 Solid coverage with minor gaps
Developing 34 Usable, with meaningful gaps to close
Thin 24 Limited public surface area
Emerging 45 Early or largely undocumented
Minimal 109 Almost no public developer surface
Unrated 2 Not yet scored
Properties
Portfolio
Where the firm publishes its investments
Firm
The firm itself
Cohort brief
Auto-generatedThe 228 portfolio companies with APIs in the catalog, backed by Kleiner Perkins, scored on the Kin Score. Every figure below is computed from the catalog — nothing here is written.
| Facet | This cohort | Catalog | Difference | Scored |
|---|---|---|---|---|
| Contract Quality | 19.2 | 17.5 | +1.7 | 228 |
| Operational Transparency | 11.9 | 11.3 | +0.6 | 228 |
| Developer Ergonomics | 18.5 | 17.9 | +0.6 | 228 |
| Contract Governance | 5.6 | 6.4 | -0.8 | 228 |
| Discoverability | 59.5 | 60.4 | -0.9 | 228 |
| Access Clarity | 19.7 | 22.3 | -2.6 | 228 |
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) | 16% | 16% | 0 |
| MCP server (first-party) | 7% | 7% | 0 |
| Agent Skills | 0% | 0% | 0 |
| OAuth scopes | 10% | 9% | +1 |
| Security | 75% | 88% | -13 |
| Arazzo workflows | 4% | 2% | +2 |
| Governance rules | 14% | 13% | +1 |
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.
Source (apis.yml)
Work with this as data
Every firm here is available over the APIs.io API and to AI agents over MCP.