In the second session of the 51st Legislature, the Oklahoma State Senate considered 1,069 new Senate Bills and 769 carryover Senate Bills, 472 House bills, 31 Senate Joint Resolutions, 31 carryover Senate Joint Resolutions, 18 House Joint Resolutions, 61 Senate Concurrent Resolutions, 34 House Concurrent Resolutions and 54 Simple Resolutions.  Of those measures, 248 Senate Bills and 191 House Bills were signed into law; while eight Senate Bills and four House Bills were vetoed (the veto of SB 1878 was overridden).  Three constitutional amendments (HB 3354 and SJRs 29 and 38) and 91 Senate C

The First Session of the 52nd Legislature convened in January 2009.  For the first time in state history, Republicans held a majority of seats in the Oklahoma State Senate.  The upper chamber had been tied in the 51st Legislature, with each caucus controlling 24 seats. Senator Glenn Coffee, who previously held the title of Co-President Pro Tempore under the power sharing agreement, was elected President Pro Tempore.  Senator Charlie Laster was selected by his caucus as Democratic Floor Leader. 

In the second session of the 52nd Legislature, the Oklahoma State Senate considered 1,082 new Senate Bills and 45 carryover Senate Bills, 505 House Bills, 28 Senate Joint Resolutions, 2 carryover Senate Joint Resolutions, 15 House Joint Resolutions, 32 Senate Concurrent Reso-lutions, 19 House Concurrent Resolutions and 71 Simple Resolutions. Of those measures, 208 Senate Bills and 235 House Bills were signed into law, while 12 Senate Bills and 19 House Bills were vetoed (the vetoes of HBs 2656, 2780 and 3284 were overridden).

The first session of the 53rd Oklahoma Legislature started with historic turnover, with the election of Mary Fallin as the first woman Governor in state history and the selection of new legislative leadership, including Senate President Pro Tempore Brian Bingman and Speaker of the House of Representatives Kris Steele. The Senate welcomed ten new members: Senators Mark Allen, Josh Brecheen, Rick Brinkley, Kim David, Eddie Fields, David Holt, Rob Johnson, Ralph Shortey, Frank Simpson, and Greg Treat; along with 21 new state Representatives.

The 2012 Oklahoma Legislative Session convened on February 6 and adjourned sine die on May 25, 2012, under the leadership of Senator Brian Bingman, President Pro Tempore, Senator Mike Schulz, Majority Floor Leader and Senator Sean Burrage, Democratic Floor Leader. The Legislature considered over 2,000 bills and joint resolutions, of which 171 Senate measures and 221 House measures became law. Governor Mary Fallin vetoed 11 measures.

The 2013 Oklahoma Legislative Session convened on January 8, 2013, for its biennial organizational day, and then reconvened in regular session on February 4 and adjourned sine die on May 24, 2013, a week earlier than the constitutionally mandated date. The Senate welcomed eight new members to the 54th Legislature: Senators Larry Boggs, Corey Brooks, Nathan Dahm, Kyle Loveless, Ron Sharp, Wayne Shaw, Jabar Shumate and Rob Standridge.

The 2014 Oklahoma Legislative Session convened on February 3, 2014, and adjourned sine die on May 23, 2014, a week earlier than required in the Oklahoma Constitution.  The officers of the Senate for 2013 were continued, including Senator Brian Bingman, President Pro Tempore, Senator Mike Schulz, Majority Floor Leader and Senator Sean Burrage, Democratic Floor Leader.  The Legislature considered 2,399 bills and joint resolutions, of which 188 Senate measures and 213 House measures became law.  Governor Mary Fallin vetoed 35 measures and two of those vetoes were overridden by the Legislature.

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.