The highest-priced instruments on STI Index are SGX:J36, SGX:D05, and SGX:U11 - they'll cost you 38.16 SGD, 34.38 SGD, and 31.15 SGD accordingly.
The champion of STI Index is SGX:BS6 - it's gained 42.40% over the year.
The weakest component of STI Index is SGX:D01 - it's lost 36.93% over the year.
The top companies of STI Index are SGX:D05, SGX:O39, and SGX:U11 - they can boast market cap of 71.87 B SGD, 46.27 B SGD, and 38.18 B SGD accordingly.
STI Index is just a number that lets you track performance of the instruments comprising the index, so you can't invest in it directly. But you can buy STI Index futures or funds or invest in its components.