As of 2021, the top 10 highest-valued private tech companies worldwide are:
1. Bytedance (TikTok) – $140 billion
2. Stripe – $95 billion
3. SpaceX – $74 billion
4. Didi Chuxing – $62 billion
5. Klarna – $45.6 billion
6. Paytm – $16 billion
7. Epic Games – $29 billion
8. Grab – $14 billion
9. Robinhood – $13 billion
10. UiPath – $10.2 billion
Please note that valuations of private companies can change regularly due to investment rounds and market fluctuations.