Venture Capital

Matrix Partners

Matrix Partners (now branded simply "Matrix") is an early-stage venture capital firm founded in 1977 by Paul Ferri, investing from idea through Series A. Headquartered in San Francisco at 535 Mission Street with a long-standing East Coast office in Cambridge, Massachusetts, the firm is run by former founders and company builders who describe themselves as "contrarians who invest with conviction," backing founders with deep technical expertise and a specific vision of the future. Matrix is a generalist early-stage investor across AI / frontier tech, B2B and enterprise software, fintech, consumer, healthtech, infrastructure, and semiconductors, typically writing seed and Series A checks and leading rounds. Over nearly five decades the firm has backed foundational technology and consumer companies including Apple, HubSpot, Zendesk, Canva, Afterpay, Oculus, Fivetran, Flock Safety, Quora, Postmates, GOAT, and Suno, with a track record spanning semiconductors and networking through today's AI-native startups.

130 portfolio companies 130 publish APIs here 9 properties
Venture CapitalSeedSeries AEarly StageArtificial IntelligenceFintechEnterpriseB2BInfrastructureSemiconductorsHealthTechConsumerDeveloper ToolsSan FranciscoBostonNorth America
Portfolio Strength across 129 profiled portfolio companies on the network
7 top-rated API companies 3 exemplar · 4 strong
15 agent-ready companies 2 agent-native · 13 agent-ready
Average quality of the book:
Composite emerging 21.0
Agent-Readiness human-only 9.9

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.

Matrix Partners has 130 portfolio companies tracked on the APIs.io network, of which 130 (100%) publish APIs indexed here.

Its highest-rated API providers on the network are hubspot, Lightspark, canva, Rainforest, zendesk.

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 3 Complete, well-documented, and agent-ready
hubspot25 APIs80.4Lightspark1 API69.2canva1 API67.0
Strong 4 Solid coverage with minor gaps
Rainforest7 APIs56.8zendesk76 APIs56.6apple1 API56.5Kolide2 APIs55.0
Developing 17 Usable, with meaningful gaps to close
Hookdeck1 API53.9Smartcat2 APIs52.9Flock Safety1 API47.3OpenPages1 API46.6Conductor1 API45.8Emerge Tools1 API45.4Quora1 API44.4Relace1 API44.1CloudZero1 API43.9August Health1 API42.0Splitwise1 API41.6Apollo3 APIs41.4Fini1 API41.4Steadily3 APIs40.0CloudBees1 API39.615Five1 API39.4Cosmos1 API39.3
Thin 21 Limited public surface area
WatchGuard2 APIs38.9Sieve1 API38.4Lever41 APIs38.2Teammates1 API38.2Veritas8 APIs38.2Ampersand1 API37.2Poynt1 API37.2Fivetran1 API37.0Luma Labs1 API36.5Markforged1 API36.3LogRocket1 API33.3Courier1 API32.9Chameleon1 API32.7Bugsnag5 APIs32.4Suno1 API30.8Inflection1 API28.9Centaur Labs1 API28.0LM Studio1 API27.5Postmates2 APIs27.5Gentrace1 API26.8JBoss5 APIs26.7
Emerging 28 Early or largely undocumented
GrabCAD1 API25.2Mudflap1 API24.9Redstone2 APIs24.3Lightforce24.2Parabola1 API24.2Bonsai24.0Aruba10 APIs23.1Meshcapade1 API22.9Sesame22.6Hashboard20.1afterpay3 APIs19.2Netezza18.6Oculus18.6Alteon18.3SanDisk2 APIs17.1Namely27 APIs16.4nference16.1Accord15.7Aluna15.6Ambarella15.5Mesa1 API15.5Sycamore15.4Headlight15.2Salient13.4EarnIn13.0The Ladders12.7Baselane12.1Meadow11.5
Minimal 56 Almost no public developer surface
General Medicine10.0Taxa10.0Pingo9.9Educative1 API9.8Fabletics9.7Xtalic9.3Side8.9SilverStream8.5Vermeer8.5Salsify8.3Affirmed7.7Reshop7.6Acacia6.4goat6.4Owl Labs6.4Unidesk6.4Care.com6.3Pixcel6.0Sila5.9Zest AI5.8Baya Systems5.7Lightmatter5.5Sonus5.4CTRL Labs5.3AMCC5.0ArrowPoint5.0Benny5.0Cascade5.0CloudSwitch5.0CommonGround5.0Confer5.0Gilt Groupe5.0Nubis5.0Polyvore5.0The Echo Nest5.0Mevo4.7AppIQ4.1Infinity AI4.1OmniML4.1ONDisplay4.1Prominet4.1QPID4.1SiTera4.1Starent4.1PayRange3.8Lam Research3.6Trisk Bio3.3Xilinx2.9Empirix2.8Mashgin2.5Concerto1.5Airvana0.6Argon0.6Broadband Access0.6Camiant0.6Zong0.1
Unrated 1 Not yet scored
ApartmentList

Properties

Portfolio

Where the firm publishes its investments

Portfolio
Portfolio
 Portfolio
Portfolio
 InvestmentThesis
InvestmentThesis

Team

Partners and investing staff

Team
Team
 Team
Team

Firm

The firm itself

Website
Website
 Contact
Contact
 Crunchbase
Crunchbase
 LinkedIn
LinkedIn

Cohort brief

Auto-generated

The 129 portfolio companies with APIs in the catalog, backed by Matrix Partners, scored on the Kin Score. Every figure below is computed from the catalog — nothing here is written.

Providers
129
of 130 on the roster
Mean Kin Score
20.7
even vs catalog 20.7
Mean Agent Readiness
9.9
+0.2 vs catalog 9.7
Spread
0.1–82.4
median 15.9 · σ 17.8
How the 129 split by band
Exemplar 3Strong 4Developing 13Thin 23Emerging 30Minimal 56
Facet averages, against the whole catalog
FacetThis cohortCatalogDifferenceScored
Contract Quality 19.3 17.5 +1.8 129
Developer Ergonomics 19.2 17.9 +1.3 129
Contract Governance 7.1 6.4 +0.7 129
Operational Transparency 10.9 11.3 -0.4 129
Discoverability 59.5 60.4 -0.9 129
Access Clarity 20.4 22.3 -1.9 129

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) 18% 16% +2
MCP server (first-party) 5% 7% -2
Agent Skills 0% 0% 0
OAuth scopes 7% 9% -2
Security 82% 88% -6
Arazzo workflows 3% 2% +1
Governance rules 15% 13% +2

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 HubSpot 82.4
  2. 2 Lightspark 71.4
  3. 3 Canva 69
  4. 4 Rainforest 58.3
  5. 5 Zendesk 58.1
  6. 6 Kolide 56.3
  7. 7 Hookdeck 56
  8. 8 Apple 52.8
  9. 9 Smartcat 51.6
  10. 10 Flock Safety 49.4
Top by Agent Readiness
  1. 1 HubSpot 54.4
  2. 2 Lightspark 52.6
  3. 3 Canva 49.1
  4. 4 Rainforest 41.5
  5. 5 Relace 37.4
  6. 6 Flock Safety 36.5
  7. 7 Zendesk 35.9
  8. 8 AniList 35.3
  9. 9 Hookdeck 30.9
  10. 10 Courier 30.9
This roster declares 130 members; 129 resolve to a provider in the catalog and 129 carry a score (100%). The figures above describe the scored members only.Generated from the catalog build of 25 August 2026, across 26891 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: matrix-partners
name: Matrix Partners
description: >-
  Matrix Partners (now branded simply "Matrix") is an early-stage venture capital firm founded in 1977 by
  Paul Ferri, investing from idea through Series A. Headquartered in San Francisco at 535 Mission Street with
  a long-standing East Coast office in Cambridge, Massachusetts, the firm is run by former founders and
  company builders who describe themselves as "contrarians who invest with conviction," backing founders with
  deep technical expertise and a specific vision of the future. Matrix is a generalist early-stage investor
  across AI / frontier tech, B2B and enterprise software, fintech, consumer, healthtech, infrastructure, and
  semiconductors, typically writing seed and Series A checks and leading rounds. Over nearly five decades the
  firm has backed foundational technology and consumer companies including Apple, HubSpot, Zendesk, Canva,
  Afterpay, Oculus, Fivetran, Flock Safety, Quora, Postmates, GOAT, and Suno, with a track record spanning
  semiconductors and networking through today's AI-native startups.
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://matrix.vc/favicon.ico
x-type: venture-capital
x-category: Venture Capital
created: '2026-07-17'
modified: '2026-07-17'
specificationVersion: '0.23'
tags:
  - Venture Capital
  - Seed
  - Series A
  - Early Stage
  - Artificial Intelligence
  - Fintech
  - Enterprise
  - B2B
  - Infrastructure
  - Semiconductors
  - HealthTech
  - Consumer
  - Developer Tools
  - San Francisco
  - Boston
  - North America
tags_raw:
  - Venture Capital
  - Seed
  - Series A
  - Early Stage
  - Artificial Intelligence
  - Fintech
  - Enterprise
  - B2B
  - Infrastructure
  - Semiconductors
  - HealthTech
  - Consumer
  - Developer Tools
  - San Francisco
  - Boston
  - North America
apis: []
common:
  - type: Website
    url: https://matrix.vc/
  - type: Portfolio
    url: https://matrix.vc/#portfolio
  - type: Portfolio
    url: portfolio/matrix-partners-portfolio.yml
  - type: Team
    url: https://matrix.vc/#team-anchor
  - type: Team
    url: team/matrix-partners-team.yml
  - type: InvestmentThesis
    url: https://matrix.vc/
  - type: Contact
    url: mailto:info@matrix.vc
  - type: Crunchbase
    url: https://www.crunchbase.com/organization/matrix-partners
  - type: LinkedIn
    url: https://www.linkedin.com/company/matrix-partners/
  - type: Features
    data:
      - "Stage: Seed through Series A (idea through Series A)"
      - "Sectors: AI / frontier tech, B2B, fintech, consumer, healthtech, infrastructure, semiconductors"
      - "Geography: United States (San Francisco and Boston), global technology"
      - "Founded: 1977 (by Paul Ferri)"
      - "HQ: 535 Mission Street, San Francisco, CA; office at 101 Main Street, Cambridge, MA"
      - "Brand: rebranded from Matrix Partners to Matrix (matrix.vc)"
    sources:
      - https://matrix.vc/
      - https://en.wikipedia.org/wiki/Matrix_Partners
    updated: '2026-07-17'
maintainers:
  - FN: Kin Lane
    email: info@apievangelist.com
    url: https://apievangelist.com
  - FN: APIs.json
    url: http://apisjson.org
  - FN: Matrix Partners
    url: https://matrix.vc/

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  • find_investorsThe reverse edge — which firms back a given provider.
  • cohort_statsPRO — the portfolio as a scored cohort.
  • apis_io_searchSTART HERE — APIs, providers and tags for one query, each with its total.
  • resolveTurn a domain, URL or GitHub org into the provider it belongs to.
  • find_cohortsEvery scored population of providers in the catalog.
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