Gildan Activewear, a Montreal-based T-shirt wholesaler with a roughly $6 billion market cap, pushed out co-founder Glenn Chamandy last December and tapped veteran executive Vince Tyra to replace him.

Shares of Gildan Activewear Inc. jumped on Tuesday after the T-shirt maker said it would weigh potential offers for an acquisition or another deal, marking the latest drama over the company’s ...

The only deal it has in hand is with Gildan Activewear Inc., a publicly traded Canadian company that makes T-shirts and other cotton staples in factories primarily located in Central America and ...