January 27, 2015

Stephen Tarpley traded from Orioles  to Pirates 

February 20, 2015

Steven Brault traded from Orioles  to Pirates 

April 05, 2015

Pirates  place Charlie Morton on the injured list

May 04, 2015

Pirates  sign Robert Stock

June 12, 2015

Pirates  sign JT Brubaker

June 15, 2015

Pirates  sign Kevin Newman

June 16, 2015

Pirates  sign Ke'Bryan Hayes

June 17, 2015

Pirates  sign Tanner Anderson

June 30, 2015

Pirates  sign Daniel Zamora

July 06, 2015

Pirates  place Josh Harrison on the injured list

July 16, 2015

Pirates  sign Brandon Waddell

July 20, 2015

Pirates  place Jordy Mercer on the injured list

July 30, 2015

July 31, 2015

Pirates  designate Deolis Guerra for assignment

August 07, 2015

Pirates  place Deolis Guerra on the injured list

September 01, 2015

Pirates  place Casey Sadler on the injured list

October 24, 2015

Trevor Williams traded from Marlins  to Pirates 

October 30, 2015

Pirates  sign Rodolfo Castro

November 02, 2015

J.A. Happ became a free agent

Joakim Soria became a free agent

December 07, 2015

Pirates  sign Deolis Guerra

December 12, 2015

Charlie Morton traded from Pirates  to Phillies 

December 21, 2015

Kyle Lobstein traded from Tigers  to Pirates