The ruling administration of President Bongbong Marcos formed the Alyansa para sa Bagong Pilipinas, comprising the Partido Federal ng Pilipinas (PFP), Lakas–CMD, Nacionalista Party, National Unity Party (NUP), and the Nationalist People's Coalition (NPC), to contest the election.

Winning candidates are proclaimed by the Commission on Elections (COMELEC), sitting as the National Board of Canvassers (NBOC).

The NBOC usually proclaims senators-elect by batches, if that candidate can no longer fall to worse than twelfth place in the tally.

[42] House Speaker Martin Romualdez remarked that the formation of the alliance created the "most powerful political force in our country today", noting the positioning of the PFP as the de facto ruling party in the country and Lakas' status as the largest political party in the House of Representatives.

[45][46] President Marcos remarked that the alliance aims to be based "not on political expediency but on ideology" that focuses on unity and a new Philippines.

[53][45] Party leaders under the alliance met on August 19; on the same day, Erwin Tulfo noted that the administration "still has no final senatorial lineup".

[54] On September 26, President Marcos announced the administration's twelve senatorial bets during an event at the Philippine International Convention Center in Pasay.

[55] Imee Marcos, the president's sister, opted out of her inclusion in the slate, saying " I chose to stand alone so that my 'adding' (sibling) would no longer be put in a difficult position, and my true friends won't hesitate.

[58] At a forum of the Foreign Correspondents Association of the Philippines (FOCAP) on February 22, 2024, Liberal Party spokesperson and former senator Leila de Lima announced that the party plans to field former senators Bam Aquino and Francis Pangilinan, as well as human rights lawyer Chel Diokno of the Katipunan ng Nagkakaisang Pilipino (KANP), as its senatorial candidates in the upcoming election.

[68] Senator Risa Hontiveros concurred with de Lima, stating that while she respects Trillanes's proposition, such an alliance would not form a "genuine opposition".

[80][81] Makabayan formally announced its ten-member senatorial slate on August 26, during its National Heroes Day event at the Liwasang Bonifacio in Manila.

[83] At the party's national council held on April 19, 2024, at the Nustar Resort and Casino in Cebu City, former President Rodrigo Duterte endorsed the reelection bids of incumbent Senators Ronald dela Rosa, Bong Go, and Jimmy Bondoc as well as the bid of actor Phillip Salvador as part of the party's slate for the election.

[86][87] In response to the possibility of an alliance between the ruling Marcos administration and the Liberal Party, dela Rosa affirmed that the Dutertes would lead the opposition in such case.

[88] On September, at the PDP national assembly, the party formed an alliance with Partido para sa Demokratikong Reporma, Pederalismo ng Dugong Dakilang Samahan and the Mayor Rodrigo Roa Duterte-National Executive Coordinating Committee.

[91] Duterte administration officials Raul Lambino and Jimmy Bondoc also filed their candidacies to run for senator also under PDP.

[92] In a January 30, 2025 meeting at Davao City, former president Duterte endorsed all PDP senatorial candidates, including Jayvee Hinlo, and independents Apollo Quiboloy and Rodante Marcoleta.

[100] In December, the COMELEC announced 66 names are on their final list, having received no temporary restraining orders from the Supreme Court.

[108] On February 10, at the eve of campaigning, WIlbert T. Lee withdrew, citing lack of political machinery as the reason.

Opinion polling in the Philippines is conducted by Social Weather Stations (SWS), Pulse Asia, OCTA Research, and other pollsters.

Even prior to the campaign period starting, Imee Marcos and Camille Villar were identified to be the heaviest spenders in political advertisements on television, each reportedly spending 1 billion pesos each.

[140] Bam Aquino and Kiko Pangilinan also held the campaign rally in Dasmariñas, Cavite, together with Akbayan and Mamamayang Liberal partylists.

[141][142][143] Quiboloy also held a proclamation rally at the Ynares Sports Arena in Pasig, attended by some PDP candidates.