Investors who track the Straits Times Index (SGX: ^STI), or STI, will know that Singapore Exchange Limited (SGX: S68), or SGX, performs a quarterly review of all the index’s constituents. Back in March, there was no change to the constituents for the bellwether, blue-chip index. But for June’s quarterly review, it was announced that Seatrium Limited (SGX: S51) will be replacing Keppel DC REIT (SGX: AJBU) and that this change will take effect from 19 June. Keppel DC REIT has been bumped into the STI’s reserve list. Four other stocks are also in the reserve list – CapitaLand Ascott Trust (SGX: HMN), Frasers Centrepoint Trust (SGX: J69U), Olam Group (SGX: VC2) and Suntec REIT (SGX: T82U). Investors may be wondering about Seatrium and what the company does, hence we highlight eight things you need to know about this offshore and marine group. 1. A name change Seatrium used to be known as Sembcorp Marine Ltd, or SMM....