Here are all the companies from Y Combinator's Summer 2021 Demo Day, Part 1 - NewsBreak

But before we get into notes on each company that presented, a few notes on the cohort itself. Per Y Combinator leadership, the 377 (!) startups in this cohort have founders from 47 different countries, and 37% of the founders in this cohort were from underrepresented groups (which YC's Michael Seibel says the accelerator defines as Black, Latinx or female.)