SET Index

The SET Index is a Thai composite stock market index calculated by the prices of all common stocks on the main board of the Stock Exchange of Thailand, except for stocks that have been suspended for more than one year. It is a market capitalization-weighted price index which compares the current market value of all listed common shares with its value on the base date of April 30, 1975, when the Index was established and set at 100 points.
The formula of calculation is as follows:
SET Index = / Base Market Value
The SET Index calculation is adjusted in line with modifications in the values of stocks resulting from changes in the number of stocks due to various events, e.g., public offerings, exercised warrants, or conversions of preferred to common shares, in order to eliminate all effects other than price movements from the index.
Besides the SET Index, which is calculated from the stock prices of all common stocks listed on The SET, The SET also provides other indices to investors that include the:

Annual Returns

The following table shows the annual development of the SET Index since 1975.

Year	Closing level	Change in index in points	Change in index in %
1975	84.08
1976	82.70	−1.38	−1.64
1977	181.59	98.89	119.58
1978	257.73	76.14	41.93
1979	149.40	−108.33	−42.03
1980	124.67	−24.73	−16.55
1981	106.62	−18.05	−14.48
1982	123.50	16.88	15.83
1983	134.47	10.97	8.88
1984	142.29	7.82	5.82
1985	134.95	−7.34	−5.16
1986	207.20	72.25	53.54
1987	284.94	77.74	37.52
1988	386.73	101.79	35.72
1989	879.19	492.46	127.34
1990	612.86	−266.33	−30.29
1991	711.36	98.50	16.07
1992	893.42	182.06	25.59
1993	1,682.85	789.43	88.36
1994	1,360.09	−322.76	−19.18
1995	1,280.81	−79.28	−5.83
1996	831.57	−449.24	−35.07
1997	372.69	−458.88	−55.18
1998	355.81	−16.88	−4.53
1999	481.92	126.11	35.44
2000	269.19	−212.73	−44.14
2001	303.85	34.66	12.88
2002	356.48	52.63	17.32
2003	772.15	415.67	116.60
2004	668.10	−104.05	−13.48
2005	713.73	45.63	6.83
2006	679.84	−33.89	−4.75
2007	858.10	178.26	26.22
2008	449.96	−408.14	−47.56
2009	734.54	284.58	63.25
2010	1,032.76	298.22	40.60
2011	1,025.32	−7.44	−0.72
2012	1,391.93	366.61	35.76
2013	1,298.71	−93.22	−6.70
2014	1,497.67	198.96	15.32
2015	1,288.02	−209.65	−14.00
2016	1,542.94	254.92	19.79
2017	1,753.71	210.77	13.66
2018	1,563.88	−189.83	−10.82
2019	1,579.84	15.96	1.02
2020	1,449.35	−130.49	−8.26
2021	1,657.62	208.27	14.37
2022	1,668.66	11.04	0.67
2023	1,415.85	−252.81	−15.15
2024	1,400.21	−15.64	−1.10
2025	1,259.67	−140.54	−10.04

SET Index

Annual Returns

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