Pfizer rises after a study found that the company's new mRNA flu vaccine outperforms traditional shots against predominant strains.

Plug Power shares rose after a major refinancing cut high-cost debt, extended low-cost funding and set up a key share-authorization vote.

Wall Street staged a sharp rebound Friday after a bruising week of volatility in tech, as a wave of dovish comments from Federal Reserve officials flipped market expectations toward a rate cut next month.

Elastic shares are trading lower Friday. The company reported second quarter financial results on Thursday after the market closed.