US stocks closed with broad declines in the optical communications, storage, semiconductor, and Neocloud sectors, with CIEN and LITE falling nearly 10%.

According to BIT (bit.com) market data, U.S. stocks closed on Monday (October 12): the Dow Jones Industrial Average rose 0.38%, the S&P 500 fell 0.06%, and the Nasdaq declined 0.44%. Optical communication concept stocks led the losses, with Ciena (CIEN) down 9.95%, Lumentum (LITE) down 9.78%, Applied Optoelectronics (AAOI) down 8.17%, Coherent (COHR) down 7.88%, and Credo (CRDO) down 7.25%. Storage stocks also trended lower: SanDisk (SNDK) down 5.97%, SK Hynix (SKHY) down 4.02%, Micron Technolog

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