Venture Capital

Leadout Capital

Leadout Capital is an early-stage venture capital fund headquartered in Portola Valley, California, founded in 2018 by Ali Rosenthal — an early Facebook business hire who drove growth of Facebook Mobile, later VP of Partnerships at Wealthfront, and previously of Goldman Sachs M&A and General Atlantic. The firm leads, co-leads, or takes a significant position in pre-seed and seed rounds, organizing its thesis around "founder-market fit": founders with a unique insight about a market, often born of the founding team's lived experience and their ability to build empathy with the customers they are innovating for. Leadout looks for products with strong network effects, unique data sets, organic and viral growth characteristics, great unit economics, and long-term defensibility. Its 46-company portfolio spans SaaS, vertical SaaS, marketplaces, healthcare, consumer and commerce, and infrastructure/developer tools, and includes Expo, Cloudsmith, Creatify AI, AtoB, R-Zero, Near Space Labs, Pavilion, Momentum, Axiom Cloud, and theCut. Leadout is a partner fund within Foundry Group's network-driven limited-partner model.

46 portfolio companies 12 publish APIs here 15 properties
Venture CapitalPre-SeedSeedEarly StageFounder-Market FitSaaSVertical SaaSMarketplaceHealthcareDeveloper ToolsPortola ValleyCaliforniaNorth America
Portfolio Strength across 12 profiled portfolio companies on the network
0 top-rated API companies 0 exemplar · 0 strong
0 agent-ready companies 0 agent-native · 0 agent-ready
Average quality of the book:
Composite emerging 23.1
Agent-Readiness human-only 9.8

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.

Leadout Capital has 46 portfolio companies tracked on the APIs.io network, of which 12 (26%) publish APIs indexed here.

Its highest-rated API providers on the network are Cloudsmith, Basis, Creatify AI, Expo, R-Zero.

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.

Developing 1 Usable, with meaningful gaps to close
Thin 3 Limited public surface area
Emerging 5 Early or largely undocumented
Minimal 3 Almost no public developer surface

Rest of Portfolio

34 further portfolio companies that don’t yet have a provider page on the network.

AFiAxiom CloudBiggerPictureBlockSpacesBohBookslothCastro LabsCentrlyCropConexENDVRFirst BiteHumanInsito HealthKraftfulLatiiLaws of MotionLiferaftLiSTRLovewickMomentumNear Space LabsPawscoutReserve TrustRuby MoneySageLinkSeries FinancialStellation CareStreamlaneSYKYTeamLiftThe VendryTierraWalrusYourPath

Scroll for all 34

Properties

Portfolio

Where the firm publishes its investments

Team

Partners and investing staff

Content

Blog, podcast, newsletter, and research

Firm

The firm itself

Other

Everything else declared in apis.yml

Source (apis.yml)

apis.yml Raw ↑
aid: leadout-capital
name: Leadout Capital
description: >-
  Leadout Capital is an early-stage venture capital fund headquartered in Portola Valley, California,
  founded in 2018 by Ali Rosenthal — an early Facebook business hire who drove growth of Facebook Mobile,
  later VP of Partnerships at Wealthfront, and previously of Goldman Sachs M&A and General Atlantic. The
  firm leads, co-leads, or takes a significant position in pre-seed and seed rounds, organizing its thesis
  around "founder-market fit": founders with a unique insight about a market, often born of the founding
  team's lived experience and their ability to build empathy with the customers they are innovating for.
  Leadout looks for products with strong network effects, unique data sets, organic and viral growth
  characteristics, great unit economics, and long-term defensibility. Its 46-company portfolio spans SaaS,
  vertical SaaS, marketplaces, healthcare, consumer and commerce, and infrastructure/developer tools, and
  includes Expo, Cloudsmith, Creatify AI, AtoB, R-Zero, Near Space Labs, Pavilion, Momentum, Axiom Cloud,
  and theCut. Leadout is a partner fund within Foundry Group's network-driven limited-partner model.
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.prod.website-files.com/671d7b0f53de4694d54cd93d/67378c36718e66d884cdc39a_Logo.png
url: https://raw.githubusercontent.com/api-evangelist/leadout-capital/refs/heads/main/apis.yml
x-type: venture-capital
x-category: Venture Capital
x-source: vc-portfolio
x-backed-by:
  - foundry-group
specificationVersion: '0.20'
created: '2026-07-17'
modified: '2026-07-19'
tags:
  - Venture Capital
  - Pre-Seed
  - Seed
  - Early Stage
  - Founder-Market Fit
  - SaaS
  - Vertical SaaS
  - Marketplace
  - Healthcare
  - Developer Tools
  - Portola Valley
  - California
  - North America
apis: []
common:
  - type: Website
    url: https://www.leadoutcapital.com
  - type: About
    url: https://www.leadoutcapital.com/about-us
  - type: Portfolio
    url: https://www.leadoutcapital.com/portfolio
  - type: Portfolio
    url: portfolio/leadout-capital-portfolio.yml
  - type: Team
    url: https://www.leadoutcapital.com/team
  - type: Team
    url: team/leadout-capital-team.yml
  - type: Blog
    url: https://leadoutcapital.medium.com/
  - type: BlogRSS
    url: https://leadoutcapital.medium.com/feed
  - type: Jobs
    url: https://jobs.leadoutcapital.com/jobs
  - type: LinkedIn
    url: https://www.linkedin.com/company/leadout-capital/
  - type: Twitter
    url: https://x.com/leadoutcapital
  - type: Email
    url: mailto:grit@leadoutcapital.com
  - type: DomainSecurity
    url: security/leadout-capital-domain-security.yml
  - type: LLMsTxt
    url: llms/leadout-capital-llms.txt
  - type: Leads
    url: leads/leadout-capital-new-company-leads.yml
  - type: Features
    data:
      - 'Stage: Pre-seed and seed; leads, co-leads, or takes a significant position in the round'
      - 'Thesis: founder-market fit — unique market insight born of the founding team''s lived experience'
      - 'Preferred traits: network effects, unique data sets, organic/viral growth, strong unit economics, long-term defensibility'
      - 'Sectors: SaaS, Vertical SaaS, Marketplace, Healthcare, Consumer & Commerce, Infra / Developer Tools'
      - 'Portfolio: 46 companies — 32 active, 8 acquired, 6 inactive (as published)'
      - 'Founded: 2018 by Ali Rosenthal'
      - 'HQ: Portola Valley, California, USA'
      - 'Network: partner fund in Foundry Group''s limited-partner network'
      - 'API surface: none — no public API, OpenAPI, SDK, or developer portal published'
    sources:
      - https://www.leadoutcapital.com/
      - https://www.leadoutcapital.com/about-us
      - https://www.leadoutcapital.com/portfolio
      - https://www.leadoutcapital.com/team
    updated: '2026-07-19'
maintainers:
  - FN: Kin Lane
    email: kin@apievangelist.com
    url: https://apievangelist.com
  - FN: APIs.json
    email: info@apis.io
    url: http://apisjson.org
  - FN: Leadout Capital
    url: https://www.leadoutcapital.com
x-enrichment:
  date: '2026-07-19'
  status: backfilled
  pass: local-v1
  note: backfilled from .gitignore signal + verified work evidence