Timeline
75 quarters of private financing since 2008, aggregated from public sources.
Cohort analysis
Each company grouped by the year of its first reported round, then tracked to see if it filed a follow-on. The 24-month rate is the apples-to-apples measure — share of a cohort that raised again within two years of its first round. Cohorts under three years old are still maturing.
Among large modern cohorts, follow-on momentum has cooled: the 2009 class raised again within 24 months 38.6% of the time, but the 2022 peak-market class — over 5,655 first-time raisers — came back at just 17.7%.