PACS Group (PACS) shares tumbled over 28% amid heavy trading after short-seller Hindenburg Research in a report alleged that the company's "turnaround" strategy amounts to "systematically scamming taxpayer-funded healthcare programs."

PACS did not immediately reply to MT Newswires' request for comment.

More than 8.69 million shares of traded intraday compared with a daily average of about 743,000.

Mizuho adjusted its price target for Constellation Energy (CEG) to $235 from $264, while maintaining its neutral rating.

Constellation shares were trading down nearly 11% intraday, with trading volume at over 8.28 million versus its daily average of about 3.24 million.

S&P Dow Jones Indices said Nvidia (NVDA) will replace Intel (INTC) in the Dow Jones Industrial Average effective Friday.

Intel shares dropped 2.3% as intraday trading volume climbed to over 62 million from the stock's daily average of about 81 million.

Price: 30.74, Change: -12.20, Percent Change: -28.41