In 2016, ShowBT Philippines, a subsidiary of the Korean company ShowBT Group, conducted a talent search for performers, with the aim of localizing K-pop in other Asian countries.

The candidates went through a difficult South Korean-inspired training camp, including physical training and "personality development". Trainees who were judged inadequate were sent home,until the final seven members were chosen. The training continued, with over-nine-hour work days; of the seven members, Stell remained with ShowBT, three quit, and Pablo, Josh, and Justin left but changed their minds laters. Ken, a previous candidate, also joined the group. These five became the current members of SB19.Pablo—initially using the stage name Sejun—is the band's leader.

SB19 debuted on October 26, 2018, with the single "Tilaluha",a sentimental ballad. It was followed by their fast-paced second single "Go Up",which was released on July 19, 2019. The group received little attention following this regrouping, and its members began to grow disheartened. They were on the verge of deciding to disband but several months after the song was released, their dance practice video of the song went viral on Twitter and Facebook, and SB19 was able to secure spots on Philippine television and radio. The newly found opportunity led them to use social media as a strategy to gain recognition and start planning a tour.

On November 20, 2019, SB19 became the first Filipino act to appear on the Billboard Next Big Sound chart. They also became the first Filipino act to enter the Billboard Social 50, debuting at number 28 on the week of December 28, 2019. Jeff Benjamin of Billboard noted that a growing international fan-base had aided their appearance in the chart. He added that "more artists [will] continue to look East for inspiration and a larger audience".

When a free nationwide concert tour for 2019 and ticket sales were opened for their concert in Cuneta Astrodome in Pasay, tickets quickly sold out in three minutes. They were able perform in three other cities - Silay, Cagayan de Oro and Legazpi. However, the planned concerts to be held in other major cities in the Philippines were indefinitely postponed because of the COVID-19 pandemic.

In December 2019, Sony Music Philippines signed a recording contract with the group,[27] and on the same day, the group released their third single, "Alab (Burning)", under the new record label.

On March 9, 2020, SB19 was added to the roster of artists of Spotify's RADAR Program, which supports new artists through marketing campaigns. The quintet released their debut album Get in the Zone, featuring nine tracks, including three released singles and two unreleased tracks, on July 31, 2020. Two weeks after the release of the album, SB19 achieved its highest position on the Social 50 chart at number two on the week of August 15. A week later, the group peaked at number five on the Emerging Artists chart.

On November 21, they held their first-ever online concert streamed live via the platform Global Live. It was later re-broadcast on November 28 as a fundraiser event for the communities affected by recent typhoons.

On December 3, SB19 appeared at number six on Billboard Year-End Social 50 chart, making them the first Southeast Asian act to reach the top 10 of the magazine's annual chart.

he group released "What?" on March 9, 2021, as the first single off their upcoming extended play (EP), initially planned to be released in June 2021. On April 24, their first-ever fashion collection, in collaboration with Chynna Mamawal, was released that featured two limited premium sets, shirts, and dresses, all inspired by the single. On April 29, SB19 became the first Filipino and Southeast Asian act to be nominated in Billboard Music Awards for Top Social Artist along with BTS, Blackpink, Ariana Grande, and Seventeen—which BTS won. It marked the first-ever appearance of a Filipino artist in the Billboard Music Awards. Their second pre-release single, "Mapa", was released on May 16, 2021, as a tribute to parents. A band version in collaboration with Ben&Ben was released on June 27, 2021.Their first EP Pagsibol was then released on July 22, 2021. On August 1, the group held their first concert in 2021, titled Back in the Zone streamed online on KTX and became the top-selling concert on the platform. SB19 performed in the Forte: A Pop Orchestra Concert on October 17 with the SSC Chamber Choir, Battig Chamber Orchestra, and 4th Impact for the benefit of Sr. Baptista Battig Music Foundation scholars.

On October 21, SB19 was nominated as Best Southeast Asia Act at the 2021 MTV Europe Music Awards.On November 4, "Bazinga" entered the newly launched Billboard Hot Trending Songs at number 14 for the 24-hour and number 20 on the weekly. SB19 is the first Filipino artist to debut a track on the chart. On December 16, National Commission for Culture and the Arts appointed SB19 as new Youth and Sentro Rizal ambassador. As part of the celebration of their 3rd anniversary, SB19 released a 6-episode series featuring the group members each, released on WeTV and YouTube. They also held the SB19 2021: Our Zone Third Anniversary Concert on December 18 and 19 streamed live online and later released on WeTV. On the week of December 11, "Bazinga" reached number one on the Hot Trending Songs. It later becomes the song with the most weeks at number one on the chart surpassing six weeks run of "Butter".

On January 9, 2022, the group performed for their first international music festival, representing the Philippines at the 2021 ASEAN-Korea Round Festival with the goal of sharing cultures within the ASEAN region. on March 16, they attended the Expo 2020 and performed at Dubai Exhibition Centre, marking SB19's first international live performance. On April 10, two years during which most live activities have not been allowed because of the COVID-19 pandemic, SB19 headlined the first-ever P-pop Convention (PPOP Con) at Araneta City. On April 23, SB19 held their first paid live solo concert at the Araneta Coliseum hosted by Dunkin' Philippines.

On June 28, SB19 lands spots on Twitter Philippines "#WorldMusicDay" 2022 lists. The group was able to snag the top spot in the Top Music-Related Handles in the Philippines and the Top Hashtags Around Music in the Philippines lists on Twitter from May 31 to June 1. It was revealed during the celebration of Fête de la Musique (World Music Day), which aims to laud artists and communities locally and in South East Asia. On July 5, Ken performed his newest solo single, "Bulan", at The Recording Academy Grammy's online series Global Spin, which celebrates global music, international artists, and the world's sounds. He is the first Filipino act to be featured in the said online series. On July 31, SB19 opened the Binibining Pilipinas 2022 Coronation Night with the pageant's theme song, "Win Your Heart".The theme song was originally written by the Dero "Nonong" Pedero in 1999. It was last given a new sound by Ballad King Martin Nievera in 2013 for Binibining Pilipinas' 50th Year. Being the first P-pop group to give the most significant change, they added rap lines in SB19's signature style. It gives the classic sung parts their interpretation, bringing the song firmly into the realm of P-Pop.

On August 1, at the stroke of midnight, the social media page of SB19 shared an image of their logos with static interference and glitches. It is also a signal that the group is gearing up for something new.

For the first week of August, SB19 has been teasing its comeback. On August 12, SB19 released the single comeback title "WYAT (Where You At)", a disco-pop song that highlights the urgency of disconnection to reconnection of the times that should be releasing on September 2 with an official music video and a global concert tour named Where You At Tour will kickoff in Manila on September 17 in Araneta Coliseum. The group's social media, especially Twitter, has erupted over the last few days after the boy group released a series of cryptic riddles and videos that led fans to speculate about a world tour. As a result, the hashtag #WhereIsSB19 has been trending on Twitter worldwide daily. SB19 released their final video of the series announcing that the single and tour will be launched in September. Few cities in the Philippines were included on the tours after Quezon City Metro Manila. Clark City will be the next location, then Cebu City and Davao City. Singapore, the United Arab Emirates, and the United States were also included on the comeback concert tour list.

On August 31, SB19 was among the "Preview's 50 Most Influential for 2022". An annual selection by Summit Media's "Preview Magazine" honoring individuals and groups that have made the biggest impacts in different fields across the realms of fashion, beauty, and art, these faces have maximized their digital platforms to champion the innate diversity of the Filipino identity.

On September 23, the boy band SB19 was on the list of "The 100 Most Powerful People in the Philippines: Wielders of Soft Power" by the Esquire Magazine. The 100 people named were a selection of people from different industries of private and public organizations who embody power: authority, control, and influence.

On October 10, JCI Batangas awarded SB19 as the "2022 Outstanding Filipino Gamechanger" on the 3rd Gawad Balisong. The JCI Batangas Gawad Balisong recognizes the diverse lineup of individuals who made a notable influence on the members of the local organization and the community in the Philippines. It is a selection of Filipino game-changers who are motivated individuals who lead to a shift when they are thinking or doing things. They are authentic human beings who empower the community through their humble causes and stories of good.

On November 4, SB19 made their first live guesting on a US TV show, on Fox 5's morning show "Good Day New York". The group performed their single "WYAT (Where You At)".

On November 17, SB19 returned to Billboard's Hot Trending Songs with their new track "Where You At". Debuted ranked No. 17, the retro upbeat track ranked goes up to No. 4 before midnight. "WYAT (Where You At)" is the second SB19 song to place in the same Billboard list following "Bazinga", which set the record for most weeks at No. 1 in the Hot Trending Songs chart.

On April 30, SB19 released the trailer for their upcoming EP, Pagtatag!, starring themselves and featuring Filipino actor Pepe Herrera. On May 19, the group released "Gento", the first single of Pagtatag!. The song's title was taken from the Filipino words ganito (like this), and ginto (gold), as well as gento, the Caviteño word for ganito, while the song showcases the group's growth and change after years of refinement, just like gold, as well as everyday acts leading to transformational change. On June 3, SB19 debuted on the Billboard World Digital Song Sales chart with "Gento" entering at No. 8, granting the group their inaugural top 10 placement.

Pagtatag! was released on June 9. Alongside the album's release, the group announced that they had left ShowBT, with Pagtatag! being their first release under their own label, 1Z Entertainment, which they formed to establish more creative freedom over their material. Following the release of Pagtatag!, SB19 went live for the countdown of the release of the music video for "I Want You". The group held a media conference on the same day and performed "Gento" and, for the first time, "I Want You", before a live audience. They also unveiled the schedule for their upcoming Pagtatag! World Tour which will have multiple stops in various cities across the Philippines, United States, and Canada. SB19 will start the tour in Manila with back-to-back shows on June 24–25, Davao on July 5, 2023, and Bacolod on July 9, 2023. They will head next to North America in the latter part of July to August.

On October 13, SB19's "Gento" was officially approved as an entry to the 66th Annual Grammy Awards.

Simula at Wakas is the upcoming EP by Filipino boy group SB19, set for release on April 25, 2025. The EP marks the group’s return with a new musical era and is accompanied by a global tour.

On January 31, 2025, SB19 announced the EP through their official social media accounts, releasing a teaser that provided a brief preview of the project's narrative and concept. The first pre-release single, "Dam", was on February 28, 2025, along with its official music video.

SB19 will embark on a world tour in support of Simula at Wakas, beginning on May 31, 2025. The tour includes stops in major U.S. cities such as San Francisco, Los Angeles, and Honolulu, as well as international destinations including Toronto, Tokyo, Sydney, Taipei, and Doha. Additional tour dates for Sydney, Melbourne, Tokyo, and Hong Kong have yet to be announced. The tour is scheduled to run between May and August, with additional performances planned for October 2025. SB19 has also hinted at further city announcements in the coming months.