Off-season •
July 17, 2025: The PBA approved a new rule that would ban players from playing in the league for three years if they
play in other leagues, domestic or international, following the expiration of their contracts. The rule, however, wasn't reported until a month later in August. Players are exempt from the rule if were unrestricted free agents released by the team, not offered a new contract by the team they played in the previous season within 30 days of the expiration of their previous contract, or have played in the PBA for seven full seasons (21 conferences). •
July 18, 2025: The franchise sale of the
Terrafirma Dyip was dropped after the team and the organization behind the
Zamboanga Valientes mutually agreed to no longer push through with the acquisition. Despite the failed sale, Terrafirma continued to compete through this season.
Pre-season •
September 4, 2025: The ban imposed on
Larry Muyang has been lifted after he was traded from
Phoenix Fuel Masters to
Converge FiberXers. •
September 10, 2025:
Willie Marcial and
Ricky Vargas have retained their positions as the league's commissioner and chairman, respectively. •
September 16, 2025: The PBA approved a new rule that prohibit future first overall picks from being traded for two seasons after they were drafted.
Geo Chiu, the first overall pick in the season 50 draft, was the first player covered by this new rule. •
September 26, 2025: The
Meralco Bolts unveiled a new logo, which is a simplified version of their previous mark. The team's new dark uniforms were unveiled the same day, featuring a new black base with blue accents across the jersey. A white version will be worn as the light uniform. Additionally, the 1971
Meralco Reddy Kilowatts jerseys, which were worn last season during the
50th anniversary games, will be added to the regular jersey rotation. •
October 1, 2025: Pureblends Corporation's sale of the
NorthPort Batang Pier was completed. The team rebranded as the
Titan Ultra Giant Risers. •
November 8, 2025: The PBA announced that the games between the
TNT Tropang 5G vs.
Magnolia Chicken Timplados Hotshots and the
Barangay Ginebra San Miguel vs.
Titan Ultra Giant Risers on November 9 had been postponed due to
Typhoon Uwan (Fung-wong). The said games were later postponed to December 21, 6 weeks after, with TNT defeating Magnolia in the first game and Barangay Ginebra defeating Titan Ultra in the second game. •
January 9, 2026:
TNT Tropang 5G retired the jersey number of
Ranidel de Ocampo (#33) during the halftime of Game 3 of the semifinals matchup against
Meralco Bolts. •
January 12, 2026:
Converge FiberXers players
Justine Baltazar, Mark Omega, and assistant coach Humperdink Dimatulac were all fined ₱20,000 each (totalling ₱60,000) for their “cooking gestures” during the Quarterfinals against Barangay Ginebra. •
January 20, 2026: The PBA approved a new rule that starting
PBA season 51 draft, the rookie prospects with existing contracts in other leagues would not be allowed to apply for the
PBA Draft.
Mid-season •
February 6, 2026:: The PBA announced that the
Macau Black Knights would join the
2026 PBA Commissioner's Cup as a guest team.
Commissioner's Cup •
March 20 & 21, 2026: TNT Tropang 5G forward
Glenn Khobuntin and
Rain or Shine Elasto Painters import
Jaylen Johnson were involved in a brawl in the game between the TNT vs. Rain or Shine. Both players were ejected as punches were thrown. On March 21, the PBA announced that Khobuntin was fined ₱70,000 and would be suspended by 2 games while Johnson was fined ₱50,000 and would be suspended by 1 game. •
April 10, 2026: Rain or Shine Elasto Painters retired the jersey number of
Gabe Norwood (#5) during the halftime of their game against the
Converge FiberXers. •
April 12, 2026: The game between the
Phoenix Super LPG Fuel Masters vs.
Barangay Ginebra San Miguel was temporarily halted in the first quarter as fire hit the parts of the general admission and upper box sections of the
Araneta Coliseum. After five minutes, the game resumed. ==Opening ceremonies==