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.
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 16 (35%) publish APIs indexed here. The remaining 29 are tracked as profiles without a published API on the network.
Its highest-rated API providers on the network are Basis, Momentum, Near Space Labs, Cloudsmith, Expo.
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.
The 42 portfolio companies with APIs in the catalog, backed by
Leadout Capital, scored on the Kin Score. Every figure below is computed from
the catalog — nothing here is written.
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)
7%
15%
-8
MCP server (first-party)
7%
13%
-6
Agent Skills
0%
0%
0
OAuth scopes
2%
12%
-10
Security
98%
98%
0
Arazzo workflows
0%
2%
-2
Governance rules
7%
18%
-11
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.
All 45 members of this roster resolve to a provider in the
catalog; 42 carry a score (93%).
The figures above describe the scored members only. Coverage caveat. 40 of 42 scored members had under half their catalog-attributable points satisfied at all (catalog_earned / catalog_max < 0.5). They are INCLUDED in the mean above. A large share here means the cohort mean is partly a measurement of how far our enrichment reached, not only of how these providers publish.Generated from the catalog build of
2 November 2026, across 37080
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.
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.
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://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: '0.23'
created: '2026-07-17'
modified: '2026-07-19'
tags:
- Venture Capital
- Pre-Seed
- Seed
- Early Stage
- Founder-Market Fit
- Software-as-a-Service
- Vertical SaaS
- Marketplace
- Healthcare
- Developer Tools
- Portola Valley
- California
- North America
tags_raw:
- 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
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