Substack Raised $100M at a $1.1B Valuation on About $45M in Revenue

The price implies roughly 24 times forward revenue — a multiple that holds only if Substack keeps 10 cents of every dollar its writers earn as paid subscriptions scale.

On July 17, 2025, Substack announced $100 million in Series C funding at a post-money valuation of about $1.1 billion, led by the investment firm BOND and Peter Chernin's The Chernin Group, with Andreessen Horowitz, Klutch Sports founder Rich Paul, and Skims co-founder Jens Grede participating. BOND partner Mood Rowghani joined the board. The round brought Substack's total funding to around $200 million across a company of just over 100 employees, and marked a roughly 70% step up from the $650 million valuation set at its 2021 Series B.

The valuation is corroborated; the revenue underneath it is estimated. Substack does not disclose its financials, but Sacra estimates the company hit about $45 million in annualized revenue in July 2025, up from $37 million at the end of 2024 and $30 million in 2023. Against the $1.1 billion price, that is a forward multiple of roughly 24 times — Sacra computes 24x, and $1.1 billion divided by $45 million lands at 24.4x. For a company growing revenue in the low-20% range year over year, 24 times revenue prices in both a longer growth runway and a take rate that does not erode while that growth runs.

Substack charges readers, not writers, and takes a flat 10% of every paid subscription transacted on the platform, on top of which writers pay Stripe processing that pushes the effective cut to 13–16% of gross. The company's revenue is therefore mechanically chained to writer gross — what the industry calls GMV. Sacra puts that GMV at about $450 million, and $45 million is exactly 10% of it. There is no separate SaaS line, no ad business yet, no enterprise tier carrying revenue alongside the cut. Revenue grows only as the volume of money flowing through paid subscriptions grows, and only while the 10% take holds against it.

That volume has compounded. Substack passed 5 million paid subscriptions in March 2025, up from 2 million in 2023, and added more than 1 million of those between November 2024 and March 2025 alone. It reached positive cash flow in Q1 2025, though it is not yet profitable. At the time of the raise, more than 50 creators were earning over $1 million a year on the platform.

The risk to the take rate sits at the top of that earner distribution. Sacra reports that a small number of top earners account for nearly 10% of platform GMV. The concentration predates the raise: in 2022, Substack's top 10 writers alone generated about $20 million in annual creator revenue. A 10%-of-GMV model depends on retaining its largest accounts, and those accounts pay the most under a flat rate that does not taper as they scale. A writer grossing $1 million a year hands Substack $100,000, and keeps handing over 10% no matter how large the account grows.

That flat rate is why competitive pressure concentrates among the biggest writers. A growing number of high-revenue creators have moved to Beehiiv and Ghost, which charge a flat monthly SaaS fee rather than a cut of each transaction, to avoid the 10%. For a large writer, a few hundred dollars a month in tooling costs less than six figures in platform fees. That defection risk lands on the exact GMV that drives the most revenue, which is why take-rate durability rather than raw subscriber count is the variable carrying the valuation. Adoption among smaller writers can keep climbing while the highest-grossing accounts have the strongest reason to leave.

There is a competing read on whether even a holding 10% gets Substack where its investors need to go. Casey Newton of Platformer has argued that venture firms rarely back companies they don't believe can return 10 times their money, and that the distance between $45 million in annual revenue and an outcome of that scale is large enough to pressure Substack toward monetizing free readers, changing creator economics, or adding advertising. The founders have moved on the last option: in a post-raise interview, the same executives who once rejected advertising no longer sound opposed to it. An ad business would add a second revenue line that no longer depends on the 10% cut, and is the kind of lever a platform under take-rate pressure has reason to pull.

The 2022 history sizes the stakes. That year, Substack abandoned a planned Series C of roughly $75 million to $100 million at a $750 million to $1 billion valuation, against just $9 million in 2021 revenue — an implied multiple north of 80 times that the market would not clear. The 2025 round closed near the same valuation the 2022 round could not, on five times the revenue. Substack grew into the price it once couldn't justify, and grows past it only if that 10% take holds against the writers with the most reason to leave.