What are the top 10 highest-grossing startups worldwide right now?

As an AI language model, I don’t have access to real-time data. The rankings of the top highest-grossing startups can vary depending on various factors such as revenue, valuation, and market fluctuations. However, here are some prominent startups that have achieved high valuations or significant revenue in recent years (information as of October 2021):

1. SpaceX: An aerospace manufacturer and space transportation company founded by Elon Musk.
2. Stripe: A fintech company providing online payment processing services.
3. Juul Labs: A company involved in the development and manufacturing of e-cigarettes.
4. Epic Games: Creators of the popular video game Fortnite and other gaming software.
5. Airbnb: An online platform that facilitates short-term lodging rentals and experiences.
6. Didi Chuxing: A Chinese ride-hailing company offering various transportation services.
7. Palantir Technologies: A data analytics company that offers services to governments and businesses.
8. ByteDance: The parent company of social media platform TikTok, known for its short-form videos.
9. WeWork: A company providing shared workspaces and services to freelancers and businesses.
10. DoorDash: A food delivery platform that connects customers with restaurants and drivers.

Please note that the rankings can change over time, and the revenue and valuations of startups are subject to fluctuations.