Core Insights - Rare earth stocks are experiencing mixed performance amid reports of shortages in yttrium and scandium, which are critical for aerospace and semiconductor industries [1] - These shortages are attributed to China's restrictions on the export of these heavy rare earth minerals, implemented last April [1] Group 1: Industry Impact - Aerospace and semiconductor firms are facing significant shortages of yttrium and scandium, which are essential for their operations [1] - The prices of heavy rare earth minerals, crucial for military hardware, have surged outside of China, indicating a growing demand and potential supply constraints [1] Group 2: Companies to Watch - Key companies in the rare earth sector include MP Materials (MP), NioCorp Developments (NB), American Resources (AREC), Rio Tinto (RIO), and Lynas Rare Earths (LYSCF), which are highlighted as stocks to monitor amid the current market conditions [1]