Substack

The platform for subscription publishing.

News and Press

Andreessen Horowitz Leads $15.3 Million Funding Round in Newsletter Publishing Platform Substack

Fortune • July 16, 2019

Newsletter publishing platform Substack raised $15.3 million in Series A funding. Andreessen Horowitz led the round, and was joined by investors including Y Combinator.

Blog Posts

Candidates flipped seven Senate seats this election. The winners are all on Substack.

November 7, 2026

New on Substack: chat channels, lists, freewalls, discounts, podcast updates, and more

October 30, 2026

Introducing lists on Substack

October 29, 2026

Model Behavior: Rick Rubin

October 22, 2026
Show all Blog Posts (755 more)