Atkore (ATKR) shares rose more than 26% after the company said it has entered a definitive agreement to be acquired by Prysmian for $95 per share in an all-cash transaction with an enterprise value of about $3.8 billion.

Intraday trading volume stood at over 5.51 million, compared with a daily average of about 423,000.

Lindblad Expeditions (LIND) reported a narrower Q2 undistributed loss on Monday as a jump in sales beat market expectations, and the company raised its 2026 tour revenue guidance.

Shares jumped 9.3%, with intraday trading volume rising to more than 1.0 million from the stock's daily average of about 892,000.

Marcus Theatres, a division of Marcus (MCS), reported that the opening weekend of Spider-Man: Brand New Day set the record for the highest opening day and second-highest opening weekend for a single title ever at Marcus Theatres, according to a statement.

Shares advanced 6.2% amid an increase in intraday trading volume to over 505,000 from a daily average of roughly 232,000.

Price: 93.55, Change: +20.59, Percent Change: +28.21