Silence Therapeutics (SLN) reported "positive" topline results from its phase 2 trial of divesiran in 48 phlebotomy-dependent patients with polycythemia vera, according to a statement Monday.

Shares soared 29% amid a surge in intraday trading volume to over 13.6 million from a daily average of about 441,000.

Blackstone's (BX) portfolio firm Safe Harbor has agreed to acquire MarineMax (HZO) for $53 per share in cash, valuing the recreational boat retailer at about $1.5 billion, including debt, the companies said Monday.

Shares of MarineMax surged 45% as intraday trading volume jumped to over 6.28 million from a daily average of roughly 310,000.

Teledyne Technologies (TDY) has agreed to acquire X-ray imaging components manufacturer Varex Imaging (VREX) in a $1.1 billion deal that will expand its X-ray device portfolio to include oncology detectors.

Shares of Varex surged 48% as intraday trading volume jumped to over 10.9 million from a daily average of roughly 431,000.

Price: 696.96, Change: +5.66, Percent Change: +0.82