The club was formed by the merger of KOŠ Koper and KK Lastovka in 2016, and was disbanded in 2020 due to financial problems.

[10] After the season, which ended early because of the COVID-19 pandemic, the club did not obtain a licence for the national top division, issued by the Basketball Federation of Slovenia.

[14] On 14 September, however, the club officially announced that they had found new partners and would play in the ABA League and the Slovenian top division.

[15] In November 2020, the club became a shareholder of the Adriatic Basketball Association, following a transfer of shares from MZT Skopje.

[16] However, in December 2020, Primorska was disqualified from the ABA League after failing to play two consecutive games due to financial problems.