Testosterone at Series A vs. Series B (SHOCKING). #yc #funding #startup

6 Sept 2025 · 1 min
0:52

YouTube video (by Anne Truong MD, uploaded Sept 6, 2025) reporting on a study measuring testosterone in 107 male Y Combinator founders across funding stages. The spoken transcript summarizes that testosterone is in a healthy range pre-funding, surges at Seed, steadily rises through Series A, reaches a peak at Series B higher than pre-funding peak, then drops massively (42%) in a late BC phase — suggesting many founders ran below optimal testosterone until late-stage funding.

Questions this video answers

107 male founders.

42% drop (described as a "massiven Abfall von 42 Prozent").

Pre-funding, Seed, Series A, Series B, and a late BC phase.

Chapters

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