Y Combinator
The business, the turning points, and the decisions behind them.
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Sections to complete：02 · 05
01 / WHAT IT BUILT
What the company did
Y Combinator (YC) is an American startup accelerator and venture-capital firm launched in March 2005 by Paul Graham, Jessica Livingston, Robert Tappan Morris, and Trevor Blackwell. Running twice-yearly three-month batches that pair seed funding with intensive mentorship and a Demo Day, it has launched more than 5,000 companies — including Airbnb, Stripe, Dropbox, Reddit, Coinbase, and DoorDash. YC also operates the Hacker News forum.
02 / FAILURE REASONS
Material for this section is being gathered and checked. It will appear here once ready.
03 / EVENT HISTORY
Events in the structured record
- Founded
Paul Graham, Jessica Livingston, Robert Tappan Morris, and Trevor Blackwell launched Y Combinator, pioneering the batch-based startup accelerator model.
- Leadership transition
Paul Graham stepped back from day-to-day leadership in 2014; the organization kept scaling under new leadership.
- San Francisco move
The accelerator program relocated to San Francisco in 2019 (it later ran entirely online during the COVID-19 pandemic).
04 / CONTEMPORARY REBUILD ASSESSMENT
Difficulty of rebuilding this project today
Material for this section is being gathered and checked. It will appear here once ready.
Overall assessment: Not completed
05 / CAUSAL CHAIN / AFTERMATH
Material for this section is being gathered and checked. It will appear here once ready.