Employees at ByteDance who relocated from China to Singapore received an internal memo on Tuesday requiring them to report their income to Chinese tax authorities and pay relevant taxes to cash out on stock options that make up a significant portion of their pay, according to three people with knowledge of the matter.

While TikTok remains hugely popular in Brazil, Indonesia and other markets, its 170 million users in the United States are its most valuable.

The Supreme Court on Friday unanimously upheld the federal law banning TikTok beginning Jan. 19 unless it's sold by its China-based parent company, holding that the risk to