Keppel DC REIThas a market value of $3.6 billion while Seatrium has a market cap of $8.26 billion.
The STI has 30 component stocks that are deemed the blue-chip counters of the local stock market.
In addition, there's a so-called "STI reserve list" which comprises the five highest ranking non-constituents of the STI by market capitalisation.
They are, in alphabetical order: CapitaLand Ascott Trust, Frasers Centrepoint Trust, Keppel DC REIT, Olam Group and Suntec REIT.
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Stocks on the reserve list will replace any constituents that become ineligible as a result of corporate actions before the next review.