Side-by-side IPO readiness, funding history, and valuation comparison. Data sourced by TechStackIPO.
Scores, valuations, and signals for Stripe, Substack, and 370+ companies. 5-min read every Tuesday.
Stripe is a global financial infrastructure platform for businesses. Following its May 2026 IPO, the company is publicly traded on the NYSE with a market cap exceeding $180B.
| Industry | Fintech |
| Stage | Pre-IPO |
| IPO Status | Private |
| Valuation | $159B |
| Total Funding | $9.4B |
| Headquarters | San Francisco, CA |
Substack is the newsletter publishing platform enabling writers, journalists, and creators to build paid subscription audiences and monetize their expertise directly. Valued at $650M with $65M raised, Substack has paid out $500M+ to creators and hosts 2M+ active publications. Major creator economy IPO candidate as newsletter-based publishing becomes a legitimate independent media category.
| Industry | Media Technology |
| Stage | Series C |
| IPO Status | Pre-IPO |
| Valuation | $750M |
| Total Funding | $140M |
| Headquarters | San Francisco, CA |
Complete funding history, cap table, S-1 analysis, and investor breakdown for any company. Instant PDF download.
Or buy any single company report for $19
Stripe is valued at $159B. Substack is valued at $750M. Both valuations are based on the most recent private funding rounds tracked by TechStackIPO.
Stripe has raised $9.4B. Substack has raised $140M.
Stripe is currently private. Substack is currently pre-IPO. Track both on TechStackIPO for S-1 filings and IPO announcements.
Stripe operates in Fintech, while Substack operates in Media Technology.
Stripe is a Fintech company valued at $159B with $9.4B raised. Substack is a Media Technology company valued at $750M with $140M raised. See TechStackIPO's full side-by-side comparison for IPO readiness scores, funding timelines, and investor data.
Accredited investors can access pre-IPO shares in Stripe and Substack through secondary market platforms, pre-IPO funds, and broker-dealer platforms that facilitate private company transactions. TechStackIPO's marketplace section tracks available access options for both companies. Pre-IPO investments carry higher risk and limited liquidity.