Companies
Mature private companies often nearing IPO readiness. Currently tracking 111 companies. Last updated May 2026.
Mature private companies often nearing IPO readiness. Currently tracking 111 companies at this stage. Last updated May 2026 on TechStackIPO.
Data sourced from SEC EDGAR filings, company press releases, and verified public announcements. Browse all companies →
Series D+ companies are among the most mature private companies in the venture ecosystem, having raised hundreds of millions or billions in private capital. These late-stage companies often have revenues exceeding $250M ARR and are making deliberate decisions about the timing and venue of their public debut. Many Series D+ companies maintain private status by choice, leveraging secondary markets and private growth equity to fund expansion without the regulatory overhead of public markets. TechStackIPO closely monitors this cohort for S-1 filings, underwriter appointments, and exchange selection decisions. These companies represent the most imminent IPO pipeline.
TechStackIPO currently tracks 111 companies at the Series D+ stage. This includes companies across technology, fintech, AI, cybersecurity, healthcare, and other high-growth sectors.
Mature private companies often nearing IPO readiness. Companies at this stage typically share characteristics in revenue scale, team size, and institutional backing.
Accredited investors can access pre-IPO shares in select Series D+ companies through secondary market platforms including Forge Global, EquityZen, and Hiive. Availability depends on shareholder willingness to sell and minimum investment thresholds typically range from $10,000 to $50,000.