February 17, 2020 Bravos de Leon released RHP Guillermo Moscoso.

January 1, 2020 RHP Guillermo Moscoso assigned to Tiburones de La Guaira.

November 29, 2019 Pericos de Puebla traded RHP Guillermo Moscoso to Bravos de Leon.

October 31, 2019 RHP Guillermo Moscoso assigned to Tigres de Aragua.

July 4, 2019 Pericos de Puebla activated RHP Guillermo Moscoso.

July 2, 2019 Bravos de Leon traded RHP Guillermo Moscoso to Pericos de Puebla.

April 26, 2019 RHP Guillermo Moscoso assigned to Bravos de Leon.

March 21, 2019 Diablos Rojos del Mexico signed free agent RHP Guillermo Moscoso.

March 19, 2019 Bravos de Leon released RHP Guillermo Moscoso.

July 3, 2018 Bravos de Leon signed free agent RHP Guillermo Moscoso.

June 29, 2018 Oklahoma City Dodgers released RHP Guillermo Moscoso.

June 21, 2018 Oklahoma City Dodgers activated RHP Guillermo Moscoso from the temporarily inactive list.

June 18, 2018 Oklahoma City Dodgers placed RHP Guillermo Moscoso on the temporarily inactive list.

May 30, 2018 Oklahoma City Dodgers activated RHP Guillermo Moscoso from the temporarily inactive list.

May 26, 2018 Oklahoma City Dodgers placed RHP Guillermo Moscoso on the temporarily inactive list.

April 4, 2018 RHP Guillermo Moscoso assigned to Oklahoma City Dodgers.

February 24, 2018 RHP Guillermo Moscoso assigned to Los Angeles Dodgers.

October 9, 2017 RHP Guillermo Moscoso assigned to Tigres de Aragua.

May 7, 2017 Bravos de Leon signed free agent RHP Guillermo Moscoso.

November 21, 2013 RHP Guillermo Moscoso elected free agency.

November 20, 2013 San Francisco Giants designated RHP Guillermo Moscoso for assignment.

July 28, 2013 San Francisco Giants activated RHP Guillermo Moscoso.

July 26, 2013 Chicago Cubs traded RHP Guillermo Moscoso to San Francisco Giants.

April 30, 2013 RHP Guillermo Moscoso assigned to Iowa Cubs from AZL Cubs.

March 29, 2013 Chicago Cubs sent Guillermo Moscoso outright to AZL Cubs.

March 27, 2013 Chicago Cubs claimed Guillermo Moscoso off waivers from Toronto Blue Jays.

March 16, 2013 Toronto Blue Jays claimed Guillermo Moscoso off waivers from Kansas City Royals.

March 13, 2013 Kansas City Royals released Guillermo Moscoso.

November 2, 2012 Kansas City Royals claimed RHP Guillermo Moscoso off waivers from Colorado Rockies.

October 11, 2012 RHP Guillermo Moscoso assigned to Leones del Caracas.

September 1, 2012 Colorado Rockies recalled Guillermo Moscoso from Colorado Springs Sky Sox.

August 22, 2012 Colorado Rockies optioned Guillermo Moscoso to Colorado Springs Sky Sox.

August 15, 2012 Colorado Rockies recalled Guillermo Moscoso from Colorado Springs Sky Sox.

July 1, 2012 Colorado Springs Sky Sox recalled Guillermo Moscoso from Colorado Rockies.

June 3, 2012 Colorado Rockies recalled Guillermo Moscoso from Colorado Springs Sky Sox.

May 5, 2012 Colorado Rockies optioned Guillermo Moscoso to Colorado Springs Sky Sox.

April 28, 2012 Colorado Rockies recalled Guillermo Moscoso from Colorado Springs Sky Sox.

March 30, 2012 Colorado Rockies optioned Guillermo Moscoso to Colorado Springs Sky Sox.

January 16, 2012 Oakland Athletics traded RHP Guillermo Moscoso and LHP Josh Outman to Colorado Rockies for LF Seth Smith.

July 19, 2011 Oakland Athletics recalled Guillermo Moscoso from Sacramento River Cats.

July 7, 2011 Oakland Athletics optioned Guillermo Moscoso to Sacramento River Cats.

May 24, 2011 Oakland Athletics recalled Guillermo Moscoso from Sacramento River Cats.

March 20, 2011 Oakland Athletics optioned Guillermo Moscoso to Sacramento River Cats.

January 8, 2011 Texas Rangers Traded RHP Guillermo Moscoso to Oakland Athletics and Burlington Bees Traded RHP Ryan Kelly to Hickory Crawdads.

January 7, 2011 Texas Rangers designated RHP Guillermo Moscoso for assignment.

November 10, 2010 Texas Rangers activated RHP Guillermo Moscoso from the 60-day disabled list.

October 8, 2010 RHP Guillermo Moscoso assigned to Leones del Caracas.

September 29, 2010 Texas Rangers recalled Guillermo Moscoso from Oklahoma City RedHawks.

September 29, 2010 Texas Rangers placed RHP Guillermo Moscoso on the 60-day disabled list. Blister on his right index finger.

September 28, 2010 Guillermo Moscoso roster status changed by Texas Rangers.

May 29, 2010 Texas Rangers optioned RHP Guillermo Moscoso to Oklahoma City RedHawks.

May 15, 2010 Texas Rangers recalled Guillermo Moscoso from Oklahoma City RedHawks.

April 4, 2010 Texas Rangers optioned Guillermo Moscoso to Oklahoma City RedHawks.

January 31, 2010 RHP Guillermo Moscoso assigned to Venezuela.

October 7, 2009 RHP Guillermo Moscoso assigned to Leones del Caracas.

September 1, 2009 Texas Rangers recalled Guillermo Moscoso from Oklahoma City RedHawks.

August 20, 2009 Texas Rangers optioned Guillermo Moscoso to Oklahoma City RedHawks.

August 18, 2009 Texas Rangers recalled Guillermo Moscoso from Oklahoma City RedHawks.

August 18, 2009 Guillermo Moscoso roster status changed by Texas Rangers.

July 30, 2009 Texas Rangers optioned Guillermo Moscoso to Oklahoma City RedHawks.

July 28, 2009 Texas Rangers recalled Guillermo Moscoso from Oklahoma City RedHawks.

June 20, 2009 Texas Rangers optioned Guillermo Moscoso to Oklahoma City RedHawks.

June 9, 2009 Texas Rangers recalled Guillermo Moscoso from Oklahoma City RedHawks.

June 2, 2009 Texas Rangers optioned Guillermo Moscoso to Oklahoma City RedHawks.

June 2, 2009 Texas Rangers optioned Guillermo Moscoso to Oklahoma City RedHawks.