Ullmark, in particular, has been the subject of trade talks since the last deadline. Despite a blocked trade to the Kings, speculation continues to swirl around his departure from Boston.
With rising star Jeremy Swayman in goal, Ullmark's departure could pave the way for adjustments elsewhere.
Shattenkirk has been a solid addition to the Bruins' defense, but the emergence of Andrew Peeke suggests a shift in his role. Insider reports indicate that he may not return next season.
For Forbort, his tenure with the Bruins may be ending. As an impending free agent with injury concerns, the team is likely to part ways with him when his contract expires.