- New York Mets selected Tommie Reynolds in free agent draft on December 2, 1968.
- New York Mets purchased Skip Lockwood from the Oakland Athletics on July 28, 1975.
- Oakland Athletics signed Dave Telgheder of the New York Mets as a free agent on November 21, 1995.
- New York Mets traded Terrence Long and Leo Vasquez to the Oakland Athletics for Kenny Rogers on July 25, 1999.
- New York Mets traded Jason Isringhausen and Greg McMichael to the Oakland Athletics for Billy Taylor on July 31, 1999.
- Oakland Athletics signed Jeff Tam of the New York Mets as a free agent on November 23, 1999.
- New York Mets traded Nelson Cruz to the Oakland Athletics for Jorge Velandia on August 30, 2000.
- New York Mets signed free agent Kevin Appier of the Oakland Athletics on December 11, 2000.
- New York Mets traded David Justice to the Oakland Athletics for Mark Guthrie and Tyler Yates on December 14, 2001.
- Oakland Athletics claimed Matt Watson of the New York Mets on waivers on October 9, 2003.
- Oakland Athletics claimed Marco Scutaro of the New York Mets on waivers on October 9, 2003.
- Oakland Athletics signed Ricky Ledee of the New York Mets as a free agent on February 1, 2007.
- Oakland Athletics signed Jason Pridie of the New York Mets as a free agent on November 16, 2011.
- Oakland Athletics signed Garrett Olson of the New York Mets as a free agent on October 27, 2012.
- New York Mets traded Jefry Marte to the Oakland Athletics for Collin Cowgill on December 18, 2012.
- New York Mets signed free agent Bartolo Colon of the Oakland Athletics on December 14, 2013.
- Oakland Athletics claimed Andrew Brown of the New York Mets on waivers on October 31, 2014.
- New York Mets traded Casey Meisner to the Oakland Athletics for Tyler Clippard on July 27, 2015.
- New York Mets traded Dawrin Frias to the Oakland Athletics for Eric O'Flaherty on August 4, 2015.
- Oakland Athletics signed Alejandro De Aza of the New York Mets as a free agent on January 20, 2017.
- New York Mets traded Jeurys Familia to the Oakland Athletics for Bobby Wahl and Will Toffey on July 21, 2018.
- New York Mets signed free agent Jeurys Familia of the Oakland Athletics on December 14, 2018.
- New York Mets signed free agent Jed Lowrie of the Oakland Athletics on January 16, 2019.
- Oakland Athletics signed Jerry Blevins of the New York Mets as a free agent on February 5, 2019.
- Oakland Athletics signed Donnie Hart of the New York Mets as a free agent on February 5, 2020.
- Oakland Athletics signed Jed Lowrie of the New York Mets as a free agent on February 10, 2021.
- New York Mets signed free agent Mark Canha of the Oakland Athletics on November 30, 2021.
- New York Mets signed free agent Starling Marte of the Oakland Athletics on November 30, 2021.
- New York Mets traded J.T. Ginn and Adam Oller to the Oakland Athletics for Chris Bassitt on March 12, 2022.
- Oakland Athletics signed Trevor May of the New York Mets as a free agent on December 16, 2022.
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