[Edit] PLEASE DONT DELETE YOUR REPLY IF PEOPLE ARE GIVING THOUGHTFUL FOLLOW-UPS.

That is a very mature sample given the short duration of the relevant time frame. Admittedly I'm ignorant about the specifics of several of these 39, but I recognize most as public, acquired for $1B+, or pretty clear "winners" (e.g., Uber).

Do any in particular seem suspicious or are there examples you think are missing? I'm not arguing an ideological position, I'm genuinely interested in the "right" answer. The definition of "success" is nebulous, and data are limited, but what's available would suggest you're strongly overreaching.

2 more recent ~$1B ones that just came to mind: Wayfair and HubSpot, both of which are MBA founder teams. The latter is also a dual technical founding team: ee and cs undergrad majors.