The are many Stock Broker or also know as Participating Organization which license to trade in Bursa Malaysia. Full list can be found in Bursa Malaysia website here.
The table below shows top 15 largest stock brokers trade in Bursa Malaysia in 2010 based on Trading Value and Trading Volume.
The largest stock broker by trading value was CIMB Investment Bank with 9.80 percent from total trading value. On the other hand, the largest trading volume was OSK Investment Bank with 10.70 percent of 2010 trading volume. Seem like, people who trade via OSK like to invest in penny stock!.