November 7, 2016 RHP Jeremy Hefner elected free agency.

October 20, 2016 RHP Jeremy Hefner assigned to Gigantes del Cibao.

July 27, 2016 Memphis Redbirds activated RHP Jeremy Hefner from the 7-day disabled list.

July 14, 2016 Memphis Redbirds sent RHP Jeremy Hefner on a rehab assignment to GCL Cardinals.

May 30, 2016 Memphis Redbirds placed RHP Jeremy Hefner on the 7-day disabled list.

December 30, 2015 RHP Jeremy Hefner assigned to Memphis Redbirds.

December 22, 2015 RHP Jeremy Hefner assigned to Leones del Escogido.

December 21, 2015 St. Louis Cardinals signed free agent RHP Jeremy Hefner to a minor league contract.

December 21, 2015 RHP Jeremy Hefner roster status changed by St. Louis Cardinals.

November 16, 2015 RHP Jeremy Hefner assigned to Gigantes del Cibao.

November 16, 2015 RHP Jeremy Hefner roster status changed by Gigantes del Cibao.

September 23, 2014 St. Lucie Mets activated RHP Jeremy Hefner from the 7-day disabled list.

August 7, 2014 St. Lucie Mets placed RHP Jeremy Hefner on the 7-day disabled list. right forearm strain

July 27, 2014 RHP Jeremy Hefner assigned to St. Lucie Mets from Las Vegas 51s.

July 12, 2014 Las Vegas 51s sent RHP Jeremy Hefner on a rehab assignment to GCL Mets.

April 2, 2014 Las Vegas 51s placed RHP Jeremy Hefner on the 7-day disabled list.

January 22, 2014 RHP Jeremy Hefner assigned to Las Vegas 51s.

January 6, 2014 New York Mets signed free agent RHP Jeremy Hefner to a minor league contract and invited him to spring training.

December 2, 2013 RHP Jeremy Hefner elected free agency.

October 31, 2013 New York Mets activated RHP Jeremy Hefner from the 60-day disabled list.

September 7, 2013 New York Mets transferred RHP Jeremy Hefner from the 15-day disabled list to the 60-day disabled list. August 2013 Tommy John surgery.

August 14, 2013 New York Mets placed RHP Jeremy Hefner on the 15-day disabled list retroactive to August 10, 2013. Partially torn right elbow ligament.

August 14, 2013 Jeremy Hefner roster status changed by New York Mets.

August 11, 2013 New York Mets optioned Jeremy Hefner to Las Vegas 51s.

August 24, 2012 New York Mets activated RHP Jeremy Hefner from the paternity list.

July 21, 2012 New York Mets recalled Jeremy Hefner from Buffalo Bisons.

July 5, 2012 New York Mets optioned Jeremy Hefner to Buffalo Bisons.

May 19, 2012 New York Mets recalled Jeremy Hefner from Buffalo Bisons.

April 24, 2012 New York Mets optioned Jeremy Hefner to Buffalo Bisons.

April 23, 2012 New York Mets recalled Jeremy Hefner from Buffalo Bisons.

March 18, 2012 New York Mets optioned Jeremy Hefner to Buffalo Bisons.

December 12, 2011 New York Mets claimed Jeremy Hefner off waivers from Pittsburgh Pirates.

December 9, 2011 Pittsburgh Pirates designated Jeremy Hefner for assignment.

November 18, 2011 Pittsburgh Pirates claimed RHP Jeremy Hefner off waivers from San Diego Padres.

October 6, 2011 Jeremy Hefner roster status changed by San Diego Padres.

November 19, 2010 San Diego Padres selected the contract of Jeremy Hefner from San Antonio Missions.

April 6, 2010 Jeremy Hefner assigned to San Antonio Missions from Lake Elsinore Storm.

March 21, 2010 RHP Jeremy Hefner assigned to San Diego Padres.

June 19, 2009 Jeremy Hefner assigned to Lake Elsinore Storm from Portland Beavers.