UK-based chip designer ARM told its employees to stop all their dealings with Huawei, according to the BBC. It reportedly notified its personnel in a memo to suspend "all active contracts, support entitlements and any pending engagements" with the Chinese tech giant right after the US government added it to its Entity List. That's what the US Commerce Department calls the roster of banned companies that can no longer do business with American firms without a special license. While ARM is a British company, its memo says it uses "US origin technology" and is thus covered by the US ban.
In a brief comment to Engadget, ARM said that it is "complying with the latest restrictions set forth by the US government and is having ongoing conversations with the appropriate US government agencies to ensure [it] remain[s] compliant. ARM values its relationship with [its] longtime partner HiSilicon and it is hopeful for a swift resolution on this matter."