IDX Composite (JKSE)
Benchmark index · Indonesia · data since 1990-04-06 · last close 2026-09-08
IDX Composite (JKSE) monthly returns (%)
| Year | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2026 | -3.7 | -1.1 | -14.4 | -1.3 | -11.9 | -7.9 | 10.5 | 4.6 | 2.5 | · | · | · |
| 2025 | 0.4 | -11.8 | 3.8 | 3.9 | 6.0 | -3.5 | 8.0 | 4.6 | 2.9 | 1.3 | 4.2 | 1.6 |
| 2024 | -0.9 | 1.5 | -0.4 | -0.8 | -3.6 | 1.3 | 2.7 | 5.7 | -1.9 | 0.6 | -6.1 | -0.5 |
| 2023 | -0.2 | 0.1 | -0.6 | 1.6 | -4.1 | 0.4 | 4.0 | 0.3 | -0.2 | -2.7 | 4.9 | 2.7 |
| 2022 | 0.8 | 3.9 | 2.7 | 2.2 | -1.1 | -3.3 | 0.6 | 3.3 | -1.9 | 0.8 | -0.3 | -3.3 |
| 2021 | -1.9 | 6.5 | -4.1 | 0.2 | -0.8 | 0.6 | 1.4 | 1.3 | 2.2 | 4.8 | -0.9 | 0.7 |
| 2020 | -5.7 | -8.2 | -16.8 | 3.9 | 0.8 | 3.2 | 5.0 | 1.7 | -7.0 | 5.3 | 9.4 | 6.5 |
| 2019 | 5.5 | -1.4 | 0.4 | -0.2 | -3.8 | 2.4 | 0.5 | -1.0 | -2.5 | 1.0 | -3.5 | 4.8 |
| 2018 | 3.9 | -0.1 | -6.2 | -3.1 | -0.2 | -3.1 | 2.4 | 1.4 | -0.7 | -2.4 | 3.9 | 2.3 |
| 2017 | -0.1 | 1.8 | 3.4 | 2.1 | 0.9 | 1.6 | 0.2 | 0.4 | 0.6 | 1.8 | -0.9 | 6.8 |
| 2016 | 0.5 | 3.4 | 1.6 | -0.1 | -0.9 | 4.6 | 4.0 | 3.3 | -0.4 | 1.1 | -5.0 | 2.9 |
| 2015 | 1.2 | 3.0 | 1.3 | -7.8 | 2.5 | -5.9 | -2.2 | -6.1 | -6.3 | 5.5 | -0.2 | 3.3 |
| 2014 | 3.4 | 4.6 | 3.2 | 1.5 | 1.1 | -0.3 | 4.3 | 0.9 | 0.0 | -0.9 | 1.2 | 1.5 |
| 2013 | 3.2 | 7.7 | 3.0 | 1.9 | 0.7 | -4.9 | -4.3 | -9.0 | 2.9 | 4.5 | -5.6 | 0.4 |
| 2012 | 3.1 | 1.1 | 3.4 | 1.4 | -8.3 | 3.2 | 4.7 | -2.0 | 5.0 | 2.1 | -1.7 | 0.9 |
| 2011 | -8.0 | 1.8 | 6.0 | 3.8 | 0.5 | 1.3 | 6.2 | -7.0 | -7.6 | 6.8 | -2.0 | 2.9 |
| 2010 | 3.0 | -2.4 | 9.0 | 7.0 | -5.9 | 4.2 | 5.3 | 0.4 | 13.6 | 3.8 | -2.9 | 4.9 |
| 2009 | -1.7 | -3.5 | 11.6 | 20.1 | 11.3 | 5.7 | 14.6 | 0.8 | 5.4 | -4.0 | 2.0 | 4.9 |
| 2008 | -4.3 | 3.6 | -10.1 | -5.8 | 6.1 | -3.9 | -1.9 | -6.0 | -14.8 | -31.9 | -1.2 | 9.2 |
| 2007 | -2.7 | -0.9 | 5.2 | 9.2 | 4.3 | 2.6 | 9.8 | -6.6 | 7.5 | 12.1 | 1.7 | 2.1 |
| 2006 | 6.0 | -0.1 | 7.5 | 10.7 | -9.2 | -1.5 | 3.2 | 5.9 | 7.2 | 3.1 | 8.6 | 5.0 |
| 2005 | 4.5 | 2.7 | 0.6 | -4.7 | 5.7 | 3.1 | 5.3 | -11.2 | 2.8 | -1.2 | 2.9 | 6.0 |
| 2004 | 8.8 | 1.1 | -3.3 | 6.5 | -6.5 | -0.0 | 3.4 | -0.3 | 8.7 | 4.9 | 13.6 | 2.3 |
| 2003 | -8.6 | 2.8 | -0.3 | 13.3 | 9.7 | 2.2 | 0.5 | 4.3 | 12.8 | 4.7 | -1.4 | 12.1 |
| 2002 | 15.2 | 0.4 | 6.3 | 10.8 | -0.6 | -4.9 | -8.2 | -4.3 | -5.5 | -12.0 | 5.8 | 8.8 |
| 2001 | 2.2 | 0.6 | -11.0 | -6.0 | 13.3 | 7.8 | 1.5 | -1.9 | -9.9 | -2.2 | -0.9 | 3.1 |
| 2000 | -6.0 | -9.4 | 1.2 | -9.7 | -13.8 | 13.4 | -4.5 | -5.2 | -9.7 | -3.8 | 5.9 | -3.0 |
| 1999 | 3.5 | -3.9 | -0.6 | 25.8 | 18.2 | 13.1 | -9.7 | -5.2 | -3.4 | 8.4 | -1.7 | 15.9 |
| 1998 | 21.0 | -0.7 | 12.2 | -15.0 | -8.6 | 6.0 | 8.0 | -28.9 | -19.4 | 8.9 | 28.4 | 3.0 |
| 1997 | 8.4 | 2.1 | -6.1 | -1.5 | 6.7 | 4.1 | -0.5 | -31.5 | 10.7 | -8.5 | -19.7 | 0.0 |
| 1996 | 12.6 | 1.1 | 0.1 | 6.5 | -1.0 | -3.8 | -9.8 | 2.2 | 4.8 | -1.0 | 7.9 | 4.0 |
| 1995 | -7.6 | 4.5 | -5.5 | -2.8 | 14.1 | 3.6 | 4.0 | -2.2 | -1.5 | -1.0 | -1.4 | 6.7 |
| 1994 | 0.6 | -7.7 | -9.9 | -6.1 | 8.5 | -8.9 | -1.4 | 13.1 | -2.4 | 5.1 | -7.8 | -2.7 |
| 1993 | 2.1 | 7.2 | 3.5 | 1.1 | 8.8 | 5.4 | -1.0 | 17.0 | 0.6 | 11.0 | 11.3 | 13.5 |
| 1992 | 14.1 | -0.4 | -0.8 | -0.5 | 7.9 | 4.8 | 1.2 | -5.0 | -1.0 | 3.1 | -7.2 | -3.9 |
| 1991 | -8.3 | 2.2 | 4.3 | 1.4 | -3.9 | -12.9 | -1.8 | -11.5 | -17.2 | -9.0 | 6.5 | 2.5 |
| 1990 | · | · | · | -0.4 | -0.4 | -1.9 | -1.6 | -7.1 | -17.9 | -11.1 | -8.2 | 9.3 |
| Avg | 1.8 | 0.3 | -0.0 | 1.9 | 1.2 | 0.8 | 1.7 | -2.2 | -1.1 | 0.2 | 1.1 | 3.8 |
Values in %. Current and first-listed months are partial (greyed).
returnsview.com
JKSE seasonality — average by calendar month
IDX Composite has monthly history back to 1990. Its strongest month by median is December — positive in 31 of 36 years, median +3.0%, and higher in 7 of the last 9. November is the soft spot, down in 20 of 36 with a median of -0.6%. Across its full record it has closed 58% of months higher, swings ±7% in an average month and has fallen 65.5% peak to trough.
| Month | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg | +1.8% | +0.3% | 0.0% | +1.9% | +1.1% | +0.8% | +1.7% | -2.2% | -1.2% | +0.2% | +1.1% | +3.8% |
| Win rate | 61%/36 | 61%/36 | 58%/36 | 57%/37 | 51%/37 | 59%/37 | 68%/37 | 49%/37 | 44%/36 | 61%/36 | 44%/36 | 86%/36 |
Win rate = share of positive months / sample size.
JKSE risk & extremes
JKSE drawdown & rolling returns
Percent below the all-time high at each month-end — how far underwater the asset was.
Frequently asked questions
What was IDX Composite's best month?+
IDX Composite's strongest completed month on record is November 1998, at +28.43%.
What was IDX Composite's worst month?+
Its weakest completed month on record is October 2008, at -31.93%.
Is IDX Composite up this year?+
IDX Composite is down 22.67% year to date, measured from its last close before 1 January.
What is IDX Composite's 1-year return?+
-13.91% over the past twelve months, comparing the latest close with the most recent close on or before the same date a year earlier.
What is IDX Composite's biggest drawdown?+
The deepest peak-to-trough fall on record is 65.5%, measured on month-end closes since 1990.
Which calendar month is historically best for IDX Composite?+
December has the highest average return across every completed December since 1990. An average is not a forecast.
About IDX Composite
IDX Composite isn't a company — it's the scoreboard: Indonesia's benchmark index, tracked here like any other asset, no CEO, no earnings calls, just the crowd's verdict in one number — with price history on this site back to 1990. And the long game: $100 at its first close here (1990) would be about $1,021 today.
Did you know?
- Its best month on record was November 1998 at +28.43%; its worst, October 2008 at -31.93%.
- It has closed December in the green 31 out of 36 times — calendar astrology, but the fun kind.
Trivia for entertainment — the numbers come from our price data; the jokes don't.