Stock Market Today: Big Deal! Big Deal! Stocks Solidly in the Black on 'M&A Monday'

A roaring day of M&A and other tie-ups helped inject some life into the stock market Monday, as did renewed hopes for a successful vaccine before the end of 2020.

Chipmaker Nvidia (NVDA, 5.8%) announced late Sunday that it would buy mobile chip maker Arm Holdings from Japanese conglomerate SoftBank (SFTBY, +7.9%) for $40 billion in cash and stock.

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