Taiwan Semiconductor Manufacturing Company (TSMC) faces potential fines exceeding $1 billion due to a U.S. export control investigation regarding a chip used in Huawei's AI processor. The investigation revolves around TSMC's involvement with Huawei and Xiamen Sophgo Technologies, which is linked to Bitmain. TSMC, the world's leading contract chipmaker, has not supplied Huawei since September 2020. The situation escalated after TechInsights revealed the presence of TSMC-based chips in Huawei's 910B AI processor. The U.S. Commerce Department has previously restricted advanced chip shipments to Chinese firms, including Sophgo.