The Portmeirion Group’s brands include Spode, Portmeirion, Royal Worcester, Pimpernel, Wax Lyrical and Nambé.
Chief executive Mike Raybould said the USA was the firm’s largest and most profitable market.
A statement from the company to update investors said bosses had changed production schedules and shipments to America in the first half of this year after a review.
Some lines would be reduced or removed as a result, they added.
Full year results for the market would be “markedly down” the update added, as they have been forced to cancel orders which were subject to higher tariffs.
The firm was taking the opportunity to accelerate its Made in Stoke-on-Trent initiative, the statement added.
The scheme is part of the firm’s efforts to return production to the UK.
Other pressures included increased National Insurance contributions and minimum wage costs.
“The UK is a higher cost venue to manufacture but this is a necessary investment of margin and will benefit our brands over the medium to long term, particularly in international markets,” the company statement said.