[U.S. stock market closes with storage, Neocloud, semiconductor, and optical communication stocks broadly strengthening; APLD, WDC rise over 6%] BlockBeats reports that on October 20, according to BIT (bit.com) market data, U.S. stocks closed on Monday with the Dow Jones down 0.07%, the S&P 500 up 0.41%, and the Nasdaq up 1.11%. Storage stocks saw overall gains: Western Digital (WDC) rose 6.09%, SanDisk (SNDK) rose 5.53%, SK Hynix (SKHY) rose 4.67%, Seagate Technology (STX) rose 3.41%, and Micron Technology (MU) rose 2.97%. Most Neocloud stocks were up: Applied Digital (APLD) rose 6.65%, TeraWulf (WULF) rose 3.25%, Nebius (NBIS) rose 2.88%, IREN rose 2.74%, and Core Scientific (CORZ) rose 1.85%. Semiconductor stocks saw broad gains: Marvell Technology (MRVL) rose 4.06%, Lam Research (LRCX) rose 3.13%, Intel (INTC) rose 2.43%, TSMC (TSM) rose 1.86%, and NVIDIA (NVDA) rose 1.38%. Optical communication concept stocks mostly climbed: Marvell Technology (MRVL) rose 4.06%, Ciena (CIEN) rose 3.56%, Applied Optoelectronics (AAOI) rose 3.48%, and Credo (CRDO) rose 1.83%.