Startup profile for Trunk: latest funding, latest known valuation, total disclosed funding, investors, status, sources, and why the company is interesting. Part of the Venture Capital Tracker startup directory.
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Trunk funding, valuation and investors

Developer productivity platform — merge queues, code quality checks, and CI reliability for high-velocity engineering teams.

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Funding, valuation & investors

Answer-first snapshot

Latest funding

Series A

$25M · April 2022

Latest known valuation

Not publicly disclosed

Total disclosed equity funding

$29M

Excludes debt, grants, acquisitions, secondaries, and IPO proceeds.

Current status

private

series a

Investors in latest funding

Lead: Initialized Capital , Andreessen Horowitz

Other: Haystack Ventures , Tom Preston-Werner

Sources: latest funding Last verified: 2026-07-25

Overview

Trunk.io is a San Francisco developer-experience platform helping engineering teams ship code faster without broken builds. Founded in 2021 by David Burrows and Eli Schleifer (both ex-Uber), Trunk provides merge queue automation (Trunk Merge), static analysis and linting (Trunk Check), and flaky-test detection with CI integrations for GitHub Actions, Slack, Linear, and Jira. In April 2022 Trunk raised $25M Series A co-led by Initialized Capital and Andreessen Horowitz, following a $3.5M seed also led by a16z. The merge queue tests PRs against latest main in parallel lanes with anti-flake protection, smart batching, and monorepo support (Bazel, Nx, Turborepo).

Why Trunk is interesting

Ex-Uber engineers built Trunk to keep main green at scale: parallel merge queues, flaky-test detection, and monorepo-aware CI — a16z led seed and co-led the $25M Series A with Initialized.

Product & use cases

Trunk provides a unified DevEx platform — Trunk Merge (intelligent merge queue with parallel testing and flake quarantine), Trunk Check (aggregated linters/formatters), and flaky-test detection — integrated with GitHub, Slack, and CI providers.

  • Monorepo teams with expensive test suites needing parallel merge queues without breaking main
  • Engineering orgs quarantining flaky tests instead of blocking entire CI pipelines
  • High-velocity teams shifting code quality checks left before merge to main

Key facts

  • Series A (Apr 2022): $25M co-led by Initialized Capital and a16z (Trunk blog, VentureBeat)
  • Seed (2021): $3.5M led by a16z (VentureBeat)
  • Merge Queue: parallel lanes, anti-flake retries, monorepo support for Bazel/Nx/Turborepo (Trunk docs)
  • Founders David Burrows and Eli Schleifer built similar tooling at Uber (a16z announcement)
  • Customers include WorkOS and Faire (Startup Intros)

Funding history (newest first)

Series A

2022-04 $25M

Source: https://trunk.io/blog/trunk-raises-25m-to-build-a-unified-devex-platform

Seed

2021-11 $3.5M

Source: https://venturebeat.com/business/trunk-which-pools-open-source-tools-to-help-developers-check-and-format-their-code-raises-25m

Investors in our directory

Funds linked from Trunk's profile — open a fund page for stage focus and related deal articles.

Andreessen Horowitz Initialized Capital

Competitive landscape

Edge: Founders built merge-queue and CI reliability tooling at Uber scale — Trunk Merge's anti-flake protection and parallel lanes address pain points generic GitHub merge queues miss in monorepos.

Merge queues are becoming standard for teams with expensive CI, but GitHub's native queue lacks monorepo sophistication. Trunk competes on flake handling and parallel throughput — a niche that expands as shift-left testing and monorepos proliferate.

  • GitHub Merge Queue incumbent

    Native GitHub feature; lacks Trunk's parallel lanes, anti-flake quarantine, and monorepo-aware batching.

  • Aviator direct

    Merge queue and stacked PRs for monorepos; similar category with different batching and flake-handling approach.

  • Buildkite adjacent

    CI/CD platform; orchestrates pipelines but does not natively provide merge-queue semantics.

  • Graphite adjacent

    Stacked PRs and merge workflow tooling; focuses on author workflow vs. Trunk's CI reliability layer.

Notable stories

  • a16z's Peter Levine backed Trunk citing the founders' Uber experience with broken builds and merge failures — "incredibly tedious and frustrating to waste time rerunning pull requests" (a16z announcement).
  • Trunk Merge supports batching up to 100 PRs in one CI run with automatic bisection on failure — designed for monorepos where a single broken test can block dozens of engineers (Trunk docs).

Industries

Developer Tools Enterprise SaaS

Related funding articles

Venture Capital Tracker pieces that cover Trunk's financing or category context.

FAQs about Trunk

Practical answers founders, operators, and investors typically search for.

Trunk provides developer workflow tools — notably an enterprise merge queue that tests pull requests against latest main in parallel, plus code-quality checks (Trunk Check) and flaky-test detection.
Andreessen Horowitz led the seed and co-led the $25M Series A with Initialized Capital. See /fund/andreessen-horowitz and /fund/initialized-capital.
Trunk Merge is an intelligent merge queue — parallel testing lanes, anti-flake quarantine, smart batching (up to 100 PRs), and monorepo support for Bazel, Nx, and Turborepo.
GitHub's native queue serializes merges; Trunk adds parallel lanes, flake isolation, and monorepo-aware batching to reduce CI cost and wait times.
David Burrows and Eli Schleifer co-founded Trunk in 2021 after building similar developer tooling at Uber.
Trunk raised $25M Series A in April 2022 (~$28.5M total) and remains private as of July 2026.
Trunk Check aggregates linters and formatters into a single CLI — running code quality checks locally and in CI before merge.
No — Trunk remains a private company as of July 2026.
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