TS Entertainment was founded by Kim Tae-song in October 2008. The company signed Untouchable as their first artist and released their debut single "It's Okay" in the same month.
In October 2009, TS Entertainment officially debuted the four-member girl group Secret. They were first introduced to the public through the reality show Secret Story on Mnet. On October 13, 2009, Secret's debut single "I Want You Back" was released.
In July 2011, TS Entertainment established themselves outside South Korea through the formation of TS Japan in Tokyo, Japan.
In January 2012, TS Entertainment debuted a six-member boy band named B.A.P. The members were introduced in a documentary show, Ta-Dah, It's B.A.P which first aired on SBS MTV Korea on January 8, 2012.
On December 29, 2014, TS Entertainment debuted a seven-member girl group named Sonamoo.
On October 10 (18), 2017, they debuted boy group TRCNG. 
On April 28, 2018, TS Entertainment's CEO and founder Kim Tae-song, passed away.
On November 27, 2014 the six members of B.A.P collectively filed a lawsuit against TS Entertainment in order to nullify their contracts, claiming unfair conditions and profit distribution. The following day, TS Entertainment issued a press release refuting the claims made, stating that "there have been neither such maltreatments to the artists nor unfair clauses in the contract". On August 1, 2015, B.A.P. returned to TS Entertainment as both parties reached a settlement.
^"송지은 래퍼" 방용국, 과거 힙합씬 활동사진 공개 ‘훈훈포스’ [TS Entertainment reveals past photos of Ji Eun’s rapper, Bang Yong Guk]. Newsen Power News (in Korean). Newsen. 2011-03-08. Archived from the original on 2011-03-15. Retrieved 2012-01-23.