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Y Combinator Summer 2021 Startups

This list has 391 startups and was last updated on Oct 15, 2026. 86 of them are hiring right now. Biggest hubs: San Francisco (100), New York (36), and London (19). Largest teams: LemFi, ShipBlu, and Yummy. Latest round: Onebrief raised $151M (Oct 14, 2026).

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Questions and answers

How many startups are on this list?

There are 391 startups on this list, last updated on Oct 15, 2026.

Which of them are hiring?

86 of them are hiring right now, including ARQ, Stepful, and Double.

Which of them have the largest teams?

By team size: LemFi (500 employees), ShipBlu (300 employees), and Yummy (260 employees).

Which of them raised money recently?

Latest rounds: Onebrief — $151M Equity (Oct 2026) and Hive Health — $3.48M Equity (May 2026).

Where are they based?

The biggest hubs are San Francisco (100), New York (36), and London (19).