So averages (and medians) when it comes to start-ups can be a bit misleading.  After all start-ups are a business of trying to build an outlier.

Still, the latest data from Carta is very helpful in illustrating an overall trend the gaps between venture rounds are getting longer and longer:

Per Carta, the median time between rounds as of the end of 2024:

  • From Seed to Series A 2.2 years
  • From Series A to Series B 2.5 years
  • From Series B to Series C 2.4 years

There’s no question many hot AI start-ups are raising rounds far, far faster than this.

But it is a reminder that for most of us, if nothing else, fundraising continues to get harder each subsequent round.

Much more on that here:

The Series A Landscape in 2025: Insights from Chemistry VC’s Ethan Kurzweil

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