Startup profile for Substack: 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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Substack funding, valuation and investors

Publishing platform for independent writers with paid subscriptions.

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Funding, valuation & investors

Answer-first snapshot

Latest funding

Series B

$65M · March 2021

Latest known valuation

~$650M

Series B · March 2021

Total disclosed equity funding

$80M

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

Current status

private

growth · San Francisco, California

Investors in latest funding

Lead: Andreessen Horowitz

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

Overview

Substack lets writers publish newsletters, build paid subscriber lists, and keep majority revenue — becoming the default platform for independent journalists, analysts, and creators. Founded by Chris Best, Hamish McKenzie, and Jairaj Sethi in 2017, Substack raised $15.3M Series A (2019) and $65M Series B (2021) at ~$650M led by Andreessen Horowitz with Andrew Chen leading the deal.

Why Substack is interesting

Reference independent media business model — a16z led A and B as AI changes content economics and creator ownership matters more.

Product & use cases

Substack provides hosted newsletters, payment processing for subscriptions, discovery network, and optional podcast/video features — writers own email list and content.

  • Independent journalism monetization
  • Paid analyst and investor newsletters
  • Creator-owned audience vs social algorithms
  • Podcast and video expansion on Substack

Key facts

  • Series B (Mar 2021): $65M at ~$650M led by a16z — Substack blog
  • Series A (Jul 2019): $15.3M led by a16z
  • Independent writer subscription platform
  • Andrew Chen led a16z deal

Funding history (newest first)

Series B

2021-03 $65M Valuation: ~$650M

Source: https://on.substack.com/p/investing-in-writers

Series A

2019-07 $15.3M

Source: https://www.reuters.com/article/substack-funding-idUSL1N24U0XY

Investors in our directory

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

Andreessen Horowitz

Competitive landscape

Edge: Writer ownership of list + simple monetization — cultural brand as 'independent media' default.

Newsletter renaissance peaked 2020-2022; Substack faces Beehiiv growth tools and platform risk debates. a16z bet on creator ownership thesis remains relevant as AI slop floods open web.

  • Ghost direct

    Open-source newsletter platform; more technical setup.

  • Beehiiv direct

    Newsletter platform with growth tools; Substack competitor.

  • Medium adjacent

    Publishing platform; less subscription-native.

  • Patreon adjacent

    Creator memberships broader than writing.

Notable stories

  • Substack offered writers exit from ad-driven media during peak 'great resignation' of journalists from legacy outlets.
  • a16z's Andrew Chen published 'Investing in Writers' essay framing Substack as ownership economy infrastructure.

Industries

Media & Entertainment Consumer

FAQs about Substack

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

Substack is a publishing platform where writers run paid email newsletters and own their subscriber lists.
Andreessen Horowitz (/fund/andreessen-horowitz) led Series A and B.
Substack takes ~10% of paid subscription revenue plus payment processing fees.
Substack has discovery network and brand; Beehiiv offers more growth and ad monetization tools.
March 2021 Series B at approximately $650M per Reuters.
Chris Best, Hamish McKenzie, and Jairaj Sethi.
Yes — free and paid tiers supported.
Private; reported breakeven discussions in press but not confirmed here.
Platform debates AI-generated newsletters; policies evolved — check current Substack guidelines.
We track a16z-backed media and creator economy companies.
Website All startups Funding news

By Venture Capital Tracker

Last updated:

Editorial note: AI tools assisted with research, structure, or drafting. Venture Capital Tracker retains human editorial responsibility for factual accuracy, relevance, and source quality before publication.