SET50 Index and SET100 Index

To accommodate the issuing of index futures and options in the future, and to provide a benchmark of investment in The Stock Exchange of Thailand, the SET50 Index and the SET100 Index were launched. Both indices are calculated from the stock prices of the top 50 and 100 listed companies in the SET Index in terms of large market capitalization, high liquidity and comply with the requirement regarding the distribution of shares to minor shareholders, etc.The calculation method used for these two indices is the same as that used for the SET Index which is a market capitalization weighted index. The base dates used are August 16, 1995 (SET50 Index) and April 30, 2005 (SET100 Index), which are the respective dates when the two indices were established and set at 1000 points. The base market value is continually adjusted to correspond to changes in the values of securities resulting from changes in the number of stocks due to various events; such as public offerings, exercised warrants, conversions of preferred to common shares, etc.

tock revision

The list of component stocks in the SET50 Index and the SET100 Index are revised every six months in order to adjust for any unexpected changes that have occurred in the stock market such as new listings or public offerings. After these adjustments are made, stocks that meet the necessary qualifications are then selected to become part of the SET50 Index or the SET100 Index. Stock selection is conducted semi-annually between December 1 - 31 and June 1 - 30. During these two periods, The Stock Exchange of Thailand will select stocks based on its pre-stipulated criteria.The revised stock lists for both the SET50 and the SET100 will be announced to the general public as soon as the lists become available. New SET100 and SET50 Indices will take effect on the first trading day in January and July of each year. For every revision, both Index calculations will treat stocks which have been withdrawn as a delisting case and stocks which have been added as a new listing case. Whenever a stock is removed from either or both of the indices, a new stock will be added to replace it and to ensure the uninterruption of the indices. Also, adjustments will be made whenever the market value of a component stock changes due to the conversion of convertible bonds, the exercising of warrants, or new shares are issued for capital increase of the component stock, etc.

ET 50 component

(as of January 2007, listed in alphabetical order)

# ADVANCED INFO SERVICE PUBLIC COMPANY LIMITED
# AIRPORTS OF THAILAND PUBLIC COMPANY LIMITED
# AMATA CORPORATION PUBLIC COMPANY LIMITED
# BANGKOK BANK PUBLIC COMPANY LIMITED
# BANGKOK DUSIT MEDICAL SERVICES PUBLIC COMPANY LIMITED
# BANGKOK EXPRESSWAY PUBLIC COMPANY LIMITED
# BANK OF AYUDHYA PUBLIC COMPANY LIMITED
# BANPU PUBLIC COMPANY LIMITED
# BEC WORLD PUBLIC COMPANY LIMITED
# BUMRUNGRAD HOSPITAL PUBLIC COMPANY LIMITED
# C.P. SEVEN ELEVEN PUBLIC COMPANY LIMITED
# CAL-COMP ELECTRONICS (THAILAND) PUBLIC CO., LTD.
# CENTRAL PATTANA PUBLIC COMPANY LIMITED
# CHAROEN POKPHAND FOODS PUBLIC COMPANY LIMITED
# DELTA ELECTRONICS (THAILAND) PUBLIC COMPANY LIMITED
# ELECTRICITY GENERATING PUBLIC COMPANY LIMITED
# GLOW ENERGY PUBLIC COMPANY LIMITED
# HANA MICROELECTRONICS PUBLIC COMPANY LIMITED
# IRPC PUBLIC COMPANY LIMITED
# ITALIAN-THAI DEVELOPMENT PUBLIC COMPANY LIMITED
# KASIKORNBANK PUBLIC COMPANY LIMITED
# KHON KAEN SUGAR INDUSTRY PUBLIC COMPANY LIMITED
# KIATNAKIN BANK PUBLIC COMPANY LIMITED
# KRUNG THAI BANK PUBLIC COMPANY LIMITED
# LAND AND HOUSES PUBLIC COMPANY LIMITED
# MCOT PUBLIC COMPANY LIMITED
# MINOR INTERNATIONAL PUBLIC COMPANY LIMITED
# PRECIOUS SHIPPING PUBLIC COMPANY LIMITED
# PTT CHEMICAL PUBLIC COMPANY LIMITED
# PTT EXPLORATION AND PRODUCTION PUBLIC COMPANY
# PTT PUBLIC COMPANY LIMITED
# RATCHABURI ELECTRICITY GENERATING HOLDING PUBLIC CO.,LTD.
# REGIONAL CONTAINER LINES PUBLIC COMPANY LIMITED
# SAHAVIRIYA STEEL INDUSTRIES PUBLIC COMPANY LIMITED
# SIAM CITY BANK PUBLIC COMPANY LIMITED
# SIAM CITY CEMENT PUBLIC COMPANY LIMITED
# SIAM MAKRO PUBLIC COMPANY LIMITED
# THAI AIRWAYS INTERNATIONAL PUBLIC COMPANY LIMITED
# THAI OIL PUBLIC COMPANY LIMITED
# THAI PLASTIC AND CHEMICALS PUBLIC COMPANY LIMITED
# THAI UNION FROZEN PRODUCTS PUBLIC COMPANY LIMITED
# THANACHART CAPITAL PUBLIC COMPANY LIMITED
# THE AROMATICS (THAILAND) PUBLIC COMPANY LIMITED
# THE SIAM CEMENT PUBLIC COMPANY LIMITED
# THE SIAM COMMERCIAL BANK PUBLIC COMPANY LIMITED
# THORESEN THAI AGENCIES PUBLIC COMPANY LIMITED
# TISCO BANK PUBLIC COMPANY LIMITED
# TMB BANK PUBLIC COMPANY LIMITED
# TPI POLENE PUBLIC COMPANY LIMITED
# TRUE CORPORATION PUBLIC COMPANY LIMITED

ET 100 component

(as of January 2007, listed in alphabetical order)

# AAPICO HITECH PUBLIC COMPANY LIMITED
# ACL BANK PUBLIC COMPANY LIMITED
# ADKINSON SECURITIES PUBLIC COMPANY LIMITED
# ADVANCED INFO SERVICE PUBLIC COMPANY LIMITED
# AIRPORTS OF THAILAND PUBLIC COMPANY LIMITED
# AMATA CORPORATION PUBLIC COMPANY LIMITED
# ASIA PLUS SECURITIES PUBLIC COMPANY LIMITED
# ASIAN INSULATORS PUBLIC COMPANY LIMITED
# ASIAN PROPERTY DEVELOPMENT PUBLIC COMPANY LIMITED
# BANGKOK AVIATION FUEL SERVICES PCL.
# BANGKOK BANK PUBLIC COMPANY LIMITED
# BANGKOK CHAIN HOSPITAL PUBLIC COMPANY LIMITED
# BANGKOK DUSIT MEDICAL SERVICES PUBLIC COMPANY LIMITED
# BANGKOK EXPRESSWAY PUBLIC COMPANY LIMITED
# BANGKOK LAND PUBLIC COMPANY LIMITED
# BANK OF AYUDHYA PUBLIC COMPANY LIMITED
# BANKTHAI PUBLIC COMPANY LIMITED
# BANPU PUBLIC COMPANY LIMITED
# BEC WORLD PUBLIC COMPANY LIMITED
# BUMRUNGRAD HOSPITAL PUBLIC COMPANY LIMITED
# C.P. SEVEN ELEVEN PUBLIC COMPANY LIMITED
# CAL-COMP ELECTRONICS (THAILAND) PUBLIC CO., LTD.
# CENTRAL PATTANA PUBLIC COMPANY LIMITED
# CH. KARNCHANG PUBLIC COMPANY LIMITED
# CHAROEN POKPHAND FOODS PUBLIC COMPANY LIMITED
# DELTA ELECTRONICS (THAILAND) PUBLIC COMPANY LIMITED
# DYNASTY CERAMIC PUBLIC COMPANY LIMITED
# ELECTRICITY GENERATING PUBLIC COMPANY LIMITED
# G STEEL PUBLIC COMPANY LIMITED
# GLOW ENERGY PUBLIC COMPANY LIMITED
# GOLDEN LAND PROPERTY DEVELOPMENT PUBLIC COMPANY LIMITED
# HANA MICROELECTRONICS PUBLIC COMPANY LIMITED
# HEMARAJ LAND AND DEVELOPMENT PUBLIC COMPANY LIMITED
# HOME PRODUCT CENTER PUBLIC COMPANY LIMITED
# INDORAMA POLYMERS PUBLIC COMPANY LIMITED
# IRPC PUBLIC COMPANY LIMITED
# ITALIAN-THAI DEVELOPMENT PUBLIC COMPANY LIMITED
# ITV PUBLIC COMPANY LIMITED
# JASMINE INTERNATIONAL PUBLIC COMPANY LIMITED
# KASIKORNBANK PUBLIC COMPANY LIMITED
# KGI SECURITIES (THAILAND) PUBLIC COMPANY LIMITED
# KHON KAEN SUGAR INDUSTRY PUBLIC COMPANY LIMITED
# KIATNAKIN BANK PUBLIC COMPANY LIMITED
# KIM ENG SECURITIES (THAILAND) PUBLIC COMPANY LIMITED
# KRUNG THAI BANK PUBLIC COMPANY LIMITED
# KRUNGTHAI CARD PUBLIC COMPANY LIMITED
# L.P.N. DEVELOPMENT PUBLIC COMPANY LIMITED
# LAND AND HOUSES PUBLIC COMPANY LIMITED
# LOXLEY PUBLIC COMPANY LIMITED
# MAJOR CINEPLEX GROUP PUBLIC COMPANY LIMITED
# MCOT PUBLIC COMPANY LIMITED
# METROSTAR PROPERTY PUBLIC COMPANY LIMITED
# MINOR INTERNATIONAL PUBLIC COMPANY LIMITED
# NAKORNTHAI STRIP MILL PUBLIC COMPANY LIMITED
# NATURAL PARK PUBLIC COMPANY LIMITED
# PADAENG INDUSTRY PUBLIC COMPANY LIMITED
# PHATRA SECURITIES PUBLIC COMPANY LIMITED
# POWER LINE ENGINEERING PUBLIC COMPANY LIMITED
# PRECIOUS SHIPPING PUBLIC COMPANY LIMITED
# PREUKSA REAL ESTATE PUBLIC COMPANY LIMITED
# PTT CHEMICAL PUBLIC COMPANY LIMITED
# PTT EXPLORATION AND PRODUCTION PUBLIC COMPANY
# PTT PUBLIC COMPANY LIMITED
# QUALITY HOUSES PUBLIC COMPANY LIMITED
# RATCHABURI ELECTRICITY GENERATING HOLDING PUBLIC CO.,LTD.
# REGIONAL CONTAINER LINES PUBLIC COMPANY LIMITED
# ROBINSON DEPARTMENT STORE PUBLIC COMPANY LIMITED
# ROJANA INDUSTRIAL PARK PUBLIC COMPANY LIMITED
# SAHAVIRIYA STEEL INDUSTRIES PUBLIC COMPANY LIMITED
# SAMART CORPORATION PUBLIC COMPANY LIMITED
# SAMART I-MOBILE PUBLIC COMPANY LIMITED
# SAMART TELCOMS PUBLIC COMPANY LIMITED
# SANSIRI PUBLIC COMPANY LIMITED
# SC ASSET CORPORATION PUBLIC COMPANY LIMITED
# SHIN SATELLITE PUBLIC COMPANY LIMITED
# SIAM CITY BANK PUBLIC COMPANY LIMITED
# SIAM CITY CEMENT PUBLIC COMPANY LIMITED
# SIAM MAKRO PUBLIC COMPANY LIMITED
# SINO-THAI ENGINEERING AND CONSTRUCTION PUBLIC CO.,LTD.
# SUPALAI PUBLIC COMPANY LIMITED
# THAI AIRWAYS INTERNATIONAL PUBLIC COMPANY LIMITED
# THAI OIL PUBLIC COMPANY LIMITED
# THAI PLASTIC AND CHEMICALS PUBLIC COMPANY LIMITED
# THAI STANLEY ELECTRIC PUBLIC COMPANY LIMITED
# THAI UNION FROZEN PRODUCTS PUBLIC COMPANY LIMITED
# THANACHART CAPITAL PUBLIC COMPANY LIMITED
# THE AROMATICS (THAILAND) PUBLIC COMPANY LIMITED
# THE BANGCHAK PETROLEUM PUBLIC COMPANY LIMITED
# THE ERAWAN GROUP PUBLIC COMPANY LIMITED
# THE LANNA RESOURCES PUBLIC COMPANY LIMITED
# THE SIAM CEMENT PUBLIC COMPANY LIMITED
# THE SIAM COMMERCIAL BANK PUBLIC COMPANY LIMITED
# THORESEN THAI AGENCIES PUBLIC COMPANY LIMITED
# TICON INDUSTRIAL CONNECTION PUBLIC COMPANY LIMITED
# TISCO BANK PUBLIC COMPANY LIMITED
# TMB BANK PUBLIC COMPANY LIMITED
# TPI POLENE PUBLIC COMPANY LIMITED
# TRUE CORPORATION PUBLIC COMPANY LIMITED
# TT&T PUBLIC COMPANY LIMITED
# VANACHAI GROUP PUBLIC COMPANY LIMITED