The 2015 Oklahoma Legislature convened on January 6, 2015, for the purpose of performing its duties as required in Section 5 of Article VI of the Oklahoma Constitution and organizing pursuant to the provisions of Article V of the Oklahoma Constitution.  The Legislature reconvened on Monday, February 2, 2015, and adjourned sine die on May 22, 2015, a week earlier than required in the Oklahoma Constitution.

The 2016 Oklahoma Legislature convened on Monday, February 1, 2016, and adjourned sine die on May 27, 2016, as required in the Oklahoma Constitution.

The 1st Session of the 56th Oklahoma Legislature convened to organize on January 3, 2017 for the purpose of performing its duties as required in Section 5 of Article VI of the Oklahoma Constitution and organizing pursuant to the provisions of Article V of the Oklahoma Constitution. The Legislature reconvened on Monday, February 6, 2017, and adjourned sine die on May 26, 2017, as required in the Oklahoma Constitution.

Prior to the 2nd Session of the 56th Legislature, the Senate and House convened the 1st and 2nd Special Session of the 56th Legislature. Due to the funding shortfall resulting from the Oklahoma Supreme Court’s decision in Naifeh v. The State of Oklahoma (2017 OK 63), the Legislature needed to raise or cut spending by $215 million to balance the budget. The loss of this revenue primarily affected the Oklahoma Health Care Authority, Oklahoma Department of Mental Health and Substance Abuse, and the Department of Human Services.

The Senate convened for the 1st Session of the 57th Legislature on January 8th, 2019, to adopt Senate rules governing the Session, certify the 2018 election results, and to elect a new President Pro Tempore. Sen. Greg Treat (2011-Present) was unanimously elected. Following the President Pro Tempore election, Sen. Kim David was named the Majority Floor Leader and Sen. Kay Floyd was named as the Minority Floor Leader. The Senate adopted the rules and members were appointed to standing committees of the Senate.