The Ottawa Senators have traded center Jason Spezza and prospect Ludvig Karlsson to the Dallas Stars for forward Alex Chiasson, prospects Nicholas Paul and Alex Guptil and a second-round draft pick in 2015, a source told ESPN.com.
The Montreal Canadiens traded veteran center Daniel Briere to the Colorado Avalanche in exchange for winger P.A. Parenteau and a fifth-round pick in the 2015 NHL draft, the Habs announced on Monday.
The NHL's Board of Governors has approved changes for next year's draft lottery system, according to ESPN.com's Pierre LeBrun.
The New York Islanders have acquired the negotiating rights for impending unrestricted free agent Dan Boyle, the team announced.
The New York Rangers have acquired six-time All-Star Martin St. Louis from the Tampa Bay Lightning for captain Ryan Callahan and a pair of draft picks.
The New York Islanders acquired Thomas Vanek from the Buffalo Sabres in exchange for Matt Moulson, a first-round pick in 2014 and a second-round pick in 2015, the teams announced Sunday night.
John Tavares signed a six-year contract extension with the Islanders Thursday.