The US blacklisted the company in May because of national security concerns.
Huawei was then granted a temporary permit in order to ease the transition, which was due to expire on Monday.
However, Mr Ross added a further 46 Huawei affiliates would now be added to the US Entity List, a blacklist of firms with which the US will not trade.
The reprieve was designed to allow companies such as Google to trade with Huawei while adjusting to the restrictions.
And Mr Ross said the extension would help US customers.
“We’re giving them a little more time to wean themselves off,” he said.
Huawei said in response that it was opposed to the decision to add the extra affiliates to the Entity List and felt it was politically motivated.
“Today’s decision won’t have a substantial impact on Huawei’s business either way,”