US probes TP-Link, the China-founded router maker dominating the American market

The investigation opens a new front in the US push to crack down on China-linked technology firms deemed a possible threat to US networks and data. It singles out a company that had largely escaped national-security notice even as TP-Link came to lead the market for home and small-office routers, which relay information from the internet to devices such as computers and smartphones.

Investigators from the Commerce Department subpoenaed TP-Link this month seeking details including its company structure, according to the people, who asked not to be identified discussing a matter that has not been publicly announced. The inquiry was reported earlier Wednesday by the Wall Street Journal.

The investigation was launched in response to an August letter by the co-chairs of a bipartisan House of Representatives select committee on China, the people said. The lawmakers urged the agency to investigate the “glaring national security issue” posed by TP-Link’s dominant US market share.

They also cited Chinese laws requiring companies to aid the state’s military and intelligence objectives, and frequent Chinese state-backed cyberattacks exploiting routers.