IDX30

IDX30 is a benchmark stock market index of the Indonesia Stock Exchange (IDX) that tracks the performance of 30 of the exchange’s most liquid and highest‑capitalization stocks. It is designed to reflect the overall behavior of Indonesia’s large-cap, liquid equities and is used by investors as a performance gauge and by asset managers as a basis for passive investment products.

Constituents are selected from the listed companies on the IDX based on liquidity and free float criteria. The index is free‑float adjusted and capitalization weighted, which means larger, more liquid stocks have a greater influence on the index’s movements. The composition is reviewed and rebalanced on a semi‑annual schedule, with adjustments made to maintain representativeness of the Indonesian equity market.

Calculation and variants: IDX30 is calculated using the free‑float adjusted market capitalization of its constituents. The primary form is a price return index, which measures price changes of the included stocks. In practice, there is also a total return variant that accounts for dividends, used by some investors and analysts for a broader performance comparison.

History and use: IDX30 was introduced to provide a focused benchmark for Indonesian blue‑chip equities and to complement other indices such as the broader IDX Composite and the LQ45. It is widely cited by market participants and serves as a reference for passive funds and derivatives linked to Indonesian equities. The index is published and maintained by the IDX, with detailed methodology and constituent lists provided to investors.