As an AI language model, I don’t have real-time data. However, based on 2021 reports, the top 10 companies with the largest market capitalization were:

1. Apple Inc.
2. Microsoft Corporation
3. Amazon.com Inc.
4. Alphabet Inc. (Google)
5. Facebook Inc.
6. Tesla Inc.
7. Tencent Holdings Ltd.
8. Alibaba Group Holding Ltd.
9. Berkshire Hathaway Inc.
10. Visa Inc.

Please note that the market capitalization of companies changes frequently, and this list may vary over time. It’s always recommended to refer to the latest reliable financial sources for the most up-to-date information.