IDX begins calculating IHSG without 81 high-concentration stocks
Published · Updated
What happened
On November 2, the Indonesia Stock Exchange began applying a new IHSG calculation that excludes 81 stocks identified as having high shareholding concentration. CNBC Indonesia said the removed stocks had a combined weight of about 18%, leaving 837 constituents in the benchmark.
Why it matters
A benchmark methodology change can alter index levels, sector weights, passive fund tracking, and the comparability of current market moves with prior sessions. It also shifts how investors read liquidity and breadth in Indonesia's main equity barometer.
Indonesia Stock Exchange's new benchmark rule took effect on November 2, with the first trading day under the methodology excluding stocks deemed to have high shareholding concentration. CNBC Indonesia reported that 81 stocks with a combined weight of about 18% were removed from the IHSG calculation, leaving 837 constituents. The change is a live market-structure test for benchmark credibility, passive product tracking, and how regulators explain index performance to domestic and foreign investors over the next several sessions.
Watch for
Indonesia Stock Exchange publication on 2026-11-03 or 2026-11-04 showing the revised IHSG constituent methodology and any follow-up technical notice OJK statement by 2026-11-05 on benchmark integrity, passive products, or investor-protection rationale tied to concentrated holdings Indonesia Stock Exchange market data on 2026-11-03 to 2026-11-05 showing unusual turnover or price-limit activity in excluded stocks versus remaining IHSG constituents Major Indonesia-focused ETF or index-fund manager disclosure by 2026-11-05 on tracking changes, rebalancing, or benchmark alignment after the IHSG revision
Sources
- IHSG Ditutup Menguat 0,79% ke 5.096,83 · cnbcindonesia.com
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