Intel CEO Lip-Bu Tan was an early investor in ACM Research, a semiconductor equipment supplier that allegedly violated U.S. rules for providing technology that could be used by the Chinese military.

Tan served on the equipment firm’s advisory board beginning in 2017 and remained an adviser as recently as April, according to an archived version of ACM’s website . That was a month after he became Intel’s CEO.

An ACM securities filing from March indicated Tan’s investment firm still held at least a small stake but the company no longer lists Tan as an adviser. An ACM spokesperson said its website was in error and that Tan had left the advisory board sometime before April, but would not say when.

Regardless, the longtime connection raises more questions about Tan’s dual role as Intel’s

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