Substack won't share official numbers, but it seems like a pretty significant data breach.

Substack said that customer data was accessed in October 2025, but wasn't discovered until early February.

Substack, the hugely popular online content platform with 50 million active subscribers, has confirmed it has been hacked. Here’s what you need to know.

Substack has reached more than 5 million paid subscriptions for the first time, the company said this week. The updated audience total comes just four months after the digital journalism and content ...

Your guide to what Trump’s second term means for Washington, business and the world Substack has added more than 1mn subscriptions since Donald Trump’s triumph in the US election last November, as the ...

Exclusive: Site takes a cut of subscriptions to content that promotes far-right ideology, white supremacy and antisemitism ...