https://www.cnet.com/news/chinese-spy-chip-reportedly-found-in-server-at-major-us-telecom/

The chip was reportedly uncovered by security expert Yossi Appleboum, who was hired by the telecommunications company. Appleboum provided documents, analysis and other evidence of the manipulated hardware, according to Bloomberg, which didn't publish the documents with the article. 

The Bloomberg story doesn't identify the telecommunications company "due to Appleboum's nondisclosure agreement with the client."