U.S. stocks close with Moderna up 176%, adding $44 billion in market value

U.S. stocks close with Moderna up 176%, adding $44 billion in market value

N
News Editor
2026-08-19 23:59:26
U.S. stocks finished with sharp moves across sectors, according to data cited by Odaily from MSX.COM. The Nasdaq Biotechnology Index jumped 6.4%, marking its biggest one-day gain in six years. Moderna posted the standout move of the session, surging 176% and adding $44 billion in market capitalization. Merck rose 13%, its largest single-day advance since March 2009, while Estée Lauder gained 16%, its biggest rise since 2011. At the same time, storage and optical communications names moved lower. Seagate Technology fell more than 7%, Western Digital dropped more than 6%, and SanDisk declined 3.5%. In optical communications, Lumentum fell more than 5%, Coherent lost more than 6%, and Corning dropped more than 5%. The session showed a clear split between biotech strength and weakness in storage and optical communications stocks.

U.S. stocks closed with a strong rally in biotech shares, while storage and optical communications names fell, according to MSX.COM data cited by Odaily.

The Nasdaq Biotechnology Index rose 6.4%, its biggest gain in six years. Moderna surged 176%, adding $44 billion in market value. Merck closed up 13%, its largest one-day gain since March 2009. Estée Lauder rose 16%, marking its biggest advance since 2011.

Storage and optical communications stocks moved lower in the same session. Seagate Technology fell more than 7%, Western Digital dropped more than 6%, and SanDisk lost 3.5%. Lumentum fell more than 5%, Coherent dropped more than 6%, and Corning declined more than 5%.

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