On this episode of Stock Movers, we look at some of the week's biggest gainers and decliners:

- Shares of companies that supply semiconductor equipment are soaring this week as increased investments from leading chipmakers in South Korea bolster investors’ optimism. US-based companies like Applied Materials (AMAT) and KLA Corp (KLA) rallied along with their peers overseas. More broadly, the US chip benchmark is up 100% in the first half as it heads for the best quarter on record.

- Zimmer Biomet (ZBH) fell sharply after Cleveland Research published a report that cited disappointing orthopedic market trends.

- AeroVironment (AVAV) shares rallied after the defense company reported fourth-quarter results that topped expectations and forecast 2027 revenue that at the midpoint exceeds estimates. Analysts note strength in its drones business.