Growth Equity

D1 Capital Partners

D1 Capital Partners is a New York City-based global investment firm founded in July 2018 by Daniel Sundheim, the former Chief Investment Officer of Viking Global Investors, who seeded the firm with more than $500 million of his own capital. The name "D1" references Amazon founder Jeff Bezos's "Day One" philosophy. D1 deploys capital across both public and private markets: in public markets it runs a global long/short equity strategy (including equity derivatives and convertible bonds) targeting medium- to long-term returns, while in private markets it takes later-stage, non-controlling growth-equity stakes in expanding companies. The firm's private portfolio spans consumer, business services, financial services, healthcare, industrials, real estate, and technology, media and telecommunications, with notable positions in companies such as SpaceX, Stripe, Anthropic, OpenAI, Ramp, Robinhood, GitLab, and Instacart. As a "Tiger Cub" descended from Viking Global, D1 grew from roughly $3 billion at launch to more than $20 billion by the end of 2020, and has been reported managing on the order of $24 billion in assets. It is headquartered at 9 West 57th Street in Manhattan.

50 portfolio companies 50 publish APIs here 4 properties

Venture Capital Growth Equity Crossover Later Stage Fintech Artificial Intelligence Technology Consumer Healthcare New York Global

Portfolio Strength across 50 profiled portfolio companies on the network

8 top-rated API companies 4 exemplar · 4 strong

13 agent-ready companies 4 agent-native · 9 agent-ready

Average quality of the book:

Composite emerging 28.2

Agent-Readiness human-only 14.9

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.

D1 Capital Partners has 50 portfolio companies tracked on the APIs.io network, of which 50 (100%) publish APIs indexed here.

Its highest-rated API providers on the network are Stripe, OpenAI, Squarespace, Anthropic, GitLab.

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 4 Complete, well-documented, and agent-ready

Stripe48 APIs80.6 OpenAI15 APIs76.8 Squarespace2 APIs74.9 Anthropic6 APIs74.0

Strong 4 Solid coverage with minor gaps

GitLab13 APIs65.2 Instacart5 APIs65.0 Airtable3 APIs63.7 Unity Technologies12 APIs56.5

Developing 8 Usable, with meaningful gaps to close

Ramp1 API53.2 Genesys1 API52.9 Gopuff1 API46.9 Revolut5 APIs45.6 Robinhood1 API44.9 Cognition1 API43.3 Highspot2 APIs40.7 Procore1 API39.9

Thin 8 Limited public surface area

dLocal4 APIs38.1 Wise1 API35.3 Groq1 API35.2 Collectors1 API34.1 OneStream1 API33.6 Bolt3 APIs31.1 SpaceX1 API30.3 Lacework1 API26.7

Emerging 8 Early or largely undocumented

ByHeart22.4 Lineage16.9 Alkami1 API16.6 Multiverse15.7 Ualá1 API15.7 DriveNets12.8 Loft12.4 CelLink11.4

Minimal 18 Almost no public developer surface

Urbanic10.9 Guild10.7 Faire2 APIs10.6 Geek+10.6 Imperative Care10.5 Course Hero10.3 Rivian10.0 VulcanForms9.7 Warby Parker7.5 Dream115.8 Zetwerk5.5 SmartRent5.3 Absci5.0 Cazoo5.0 Foxtrot5.0 Sweetgreen5.0 Zomato4.1 SalioGen Therapeutics3.3

Properties

Portfolio

Where the firm publishes its investments

Portfolio

Portfolio

Firm

The firm itself

Website

Website

Crunchbase

Crunchbase

LinkedIn

Cohort brief

Auto-generated

The 50 portfolio companies with APIs in the catalog, backed by D1 Capital Partners, scored on the Kin Score. Every figure below is computed from the catalog — nothing here is written.

Providers

all scored

Mean Kin Score

27.6

+6.9 vs catalog 20.7

Mean Agent Readiness

15.2

+5.5 vs catalog 9.7

Spread

3.3–83.2

median 20.4 · σ 21.9

How the 50 split by band

Exemplar 3Strong 4Developing 6Thin 9Emerging 10Minimal 18

Facet averages, against the whole catalog

Facet	This cohort	Catalog	Difference	Scored
Contract Quality	28.1	17.5	+10.6	50
Access Clarity	29.4	22.3	+7.1	50
Operational Transparency	16.3	11.3	+5	50
Developer Ergonomics	22.5	17.9	+4.6	50
Contract Governance	10.6	6.4	+4.2	50
Discoverability	61.6	60.4	+1.2	50

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

Artifact	This cohort	Catalog	Difference
MCP server (any)	24%	16%	+8
MCP server (first-party)	12%	7%	+5
Agent Skills	0%	0%	0
OAuth scopes	16%	9%	+7
Security	98%	88%	+10
Arazzo workflows	14%	2%	+12
Governance rules	28%	13%	+15

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 Stripe 83.2
2 Squarespace 75.8
3 Anthropic 68.6
4 GitLab 65.3
5 OpenAI 64.2
6 Airtable 62.1
7 Unity 58.2
8 Ramp 53
9 Genesys 52.7
10 Revolut 52.7

Source (apis.yml)

aid: d1-capital
name: D1 Capital Partners
description: >-
  D1 Capital Partners is a New York City-based global investment firm founded in
  July 2018 by Daniel Sundheim, the former Chief Investment Officer of Viking
  Global Investors, who seeded the firm with more than $500 million of his own
  capital. The name "D1" references Amazon founder Jeff Bezos's "Day One"
  philosophy. D1 deploys capital across both public and private markets: in
  public markets it runs a global long/short equity strategy (including equity
  derivatives and convertible bonds) targeting medium- to long-term returns,
  while in private markets it takes later-stage, non-controlling growth-equity
  stakes in expanding companies. The firm's private portfolio spans consumer,
  business services, financial services, healthcare, industrials, real estate,
  and technology, media and telecommunications, with notable positions in
  companies such as SpaceX, Stripe, Anthropic, OpenAI, Ramp, Robinhood, GitLab,
  and Instacart. As a "Tiger Cub" descended from Viking Global, D1 grew from
  roughly $3 billion at launch to more than $20 billion by the end of 2020, and
  has been reported managing on the order of $24 billion in assets. It is
  headquartered at 9 West 57th Street in Manhattan.
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://logo.clearbit.com/d1capital.com
x-type: venture-capital
x-category: Growth Equity
tags:
  - Venture Capital
  - Growth Equity
  - Crossover
  - Later Stage
  - Fintech
  - Artificial Intelligence
  - Technology
  - Consumer
  - Healthcare
  - New York
  - Global
created: '2026-07-17'
modified: '2026-07-17'
specificationVersion: '0.23'
apis: []
common:
  - type: Website
    url: https://www.d1capital.com
  - type: Portfolio
    url: portfolio/d1-capital-portfolio.yml
  - type: Crunchbase
    url: https://www.crunchbase.com/organization/d1-capital-partners
  - type: LinkedIn
    url: https://www.linkedin.com/company/d1-capital-partners
  - type: Features
    data:
      - 'Firm type: Global investment firm / crossover hedge fund (Tiger Cub)'
      - 'Strategy: Public long/short equity + private later-stage growth equity'
      - 'Stage (private): Later stage, growth, pre-IPO'
      - 'Investment type: Non-controlling minority stakes'
      - >-
        Sectors: consumer, business services, financial services, healthcare,
        industrials, real estate, technology media & telecommunications
      - 'Geography: Global (US-led, with Europe, Latin America and Asia)'
      - 'AUM: ~$24 billion (reported)'
      - 'Founded: July 2018'
      - 'Founder / CIO: Daniel Sundheim'
      - 'HQ: 9 West 57th Street, New York, NY'
    sources:
      - https://en.wikipedia.org/wiki/D1_Capital_Partners
      - https://www.crunchbase.com/organization/d1-capital-partners
    updated: '2026-07-17'
maintainers:
  - FN: Kin Lane
    email: kin@apievangelist.com
    url: https://apievangelist.com
  - FN: APIs.json
    url: http://apisjson.org
  - FN: D1 Capital Partners
    url: https://www.d1capital.com

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find_investorsThe reverse edge — which firms back a given provider.
cohort_statsPRO — the portfolio as a scored cohort.
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resolveTurn a domain, URL or GitHub org into the provider it belongs to.
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