Why Moderna and Pfizer Lagged the Market Today

Moderna (NASDAQ: MRNA) and Pfizer (NYSE: PFE), for many the top two coronavirus stocks on the market, were both eclipsed by the S&P 500 index on Thursday. Moderna suffered a more than 2% decline, and Pfizer inched up only 0.6%, against the index's nearly 2% gain on the day. The culprit was discouraging news from Moderna.

Before market open on Thursday, Moderna announced that it had agreed with the European Commission (EC) to amend the delivery schedules for booster doses of Spikevax, its coronavirus vaccine.

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Source Fool.com