Short interest has also increased in MP Materials and USA Rare Earth. Short-selling specialist Grizzly Research believes some companies in the sector have benefited more from political momentum than underlying business performance. MP Materials has benefited from US government investment and pricing support for selected products. USA Rare Earth has also received conditional government funding tied to the development of domestic rare earth production. USA Rare Earth said it remains focused on expanding a secure rare earth supply chain outside China but did not comment directly on its share price performance.