As of 2021, the top 10 biggest technology companies worldwide (in terms of market capitalization) are:
1. Apple Inc.
2. Microsoft Corporation
3. Saudi Aramco
4. Amazon.com Inc.
5. Alphabet Inc. (Google)
6. Facebook, Inc.
7. Tencent Holdings Limited
8. Tesla, Inc.
9. Alibaba Group Holding Limited
10. Samsung Electronics Co., Ltd.
Please note that this list may vary over time as market values change.