• [1/15/2020] - John McCarthy announced his retirement.
• [12/6/2019] - John McCarthy of Sharks cleared waivers and was sent down to farm.
• [12/4/2019] - Sharks placed John McCarthy on waivers.
• [11/16/2019] - John McCarthy signed as an unrestricted free agent by the San Jose Sharks to a 1-year contract ($1,265,000).
• [3/16/2019] - John McCarthy of Bruins was sent to pro.
• [2/21/2019] - John McCarthy [P-Bruins] was injured (Strained Right Elbow) and is out for 1-2 weeks.
• [11/22/2018] - John McCarthy of Bruins cleared waivers and was sent down to farm.
• [11/20/2018] - Bruins placed John McCarthy on waivers.
• [2/6/2018] - John McCarthy of Bruins was loaned to the United States Olympic Team.
• [1/17/2018] - John McCarthy [P-Bruins] was injured (Left Elbow) and is out for 4-6 weeks.
• [11/1/2017] - John McCarthy of Bruins cleared waivers and was sent down to farm.
• [10/30/2017] - Bruins placed John McCarthy on waivers.
• [10/10/2017] - John McCarthy signed as an unrestricted free agent by the Boston Bruins to a 2-year contract ($725,000 per season).
• [10/15/2016] - John McCarthy of Flyers cleared waivers and was sent down to farm.
• [10/13/2016] - Flyers placed John McCarthy on waivers.
• [10/12/2016] - Flyers claimed John McCarthy off waivers from the Sharks.
• [10/10/2016] - Sharks placed John McCarthy on waivers.
• [10/26/2015] - John McCarthy of Sharks cleared waivers and was sent down to farm.
• [10/24/2015] - Sharks placed John McCarthy on waivers.
• [9/29/2015] - John McCarthy signed as an unrestricted free agent by the San Jose Sharks to a 2-year contract ($675,000 per season).
• [2/9/2015] - John McCarthy signed by the Canucks to a 1-year contract ($650,000).
• [2/7/2015] - John McCarthy was selected by the Vancouver Canucks as the 1436th overall pick of the EHE Inaugural Draft.