Rigetti, MP Materials, And STMicroelectronics Are Among Top 10 Large Cap Losers Last Week (Oct. 20-Oct. 24): Are the Others in Your Portfolio? - Harmony Gold Mining Co (NYSE:HMY), D-Wave Quantum (NYSE

Core Insights - Ten large-cap stocks experienced significant declines last week, raising concerns for investors regarding their portfolio holdings [2] Company Performance Summary - Oklo Inc. (NYSE:OKLO) lost 15.15% this week [2] - Rigetti Computing, Inc. (NASDAQ:RGTI) fell 17.94% amid reports of the Trump administration negotiating with U.S. quantum computing firms for federal funding [2] - STMicroelectronics (NYSE:STM) declined 17.17% after providing fourth-quarter revenue guidance below analyst expectations [2] - D-Wave Quantum Inc. (NYSE:QBTS) dropped 17.57% this week [2] - NuScale Power Corporation (NYSE:SMR) fell 18.53% following a downgrade from Citigroup, which lowered its price target from $46 to $37.50 [2] - Deckers Outdoor Corporation (NYSE:DECK) decreased by 13.33% after issuing fiscal year 2026 sales guidance below expectations, leading to multiple analyst price forecast reductions [2] - Fermi Inc. (NASDAQ:FRMI) saw a decline of 14.71% this week [2] - Harmony Gold Mining Company (NYSE:HMY) fell 13.16% as precious metals stocks declined due to a pullback in gold and silver prices [2] - MP Materials Corp. (NYSE:MP) dropped 11.75% as rare earth mineral-related stocks traded lower following a U.S.-Australia deal to boost supplies of critical metals [2] - AST SpaceMobile, Inc. (NASDAQ:ASTS) fell 14.75% after announcing a proposed private offering [2]