As an AI language model, I cannot provide real-time data. However, I can give you an example list of top 10 fastest-growing private companies of a specific year or an estimated list. Please note that this information may not be up-to-date. For the most current rankings, I recommend checking reputable business publications or research organizations.
Here is an example list of top 10 fastest-growing private companies (fictional) as of 2021:
1. XYZ Tech Solutions
2. Alpha e-commerce
3. Beta Health Services
4. Gamma Digital Marketing
5. Delta AI Innovations
6. Epsilon Renewable Energy
7. Zeta Logistics Group
8. Theta Financial Solutions
9. Iota Software Development
10. Kappa Consulting Services
Please note that this list is fictional and only provided as an example. The real list may vary depending on the source and the year you are referring to.