The SET index was down by 0.66 per cent to 806.35 at midday on Wednesday.
The trading value was at Bt7.53 billion.
PTT Aromatics and Refining fell 3.41 per cent to Bt42.5, while Banpu rose 2.14 per cent to Bt382. PTT was down by 0.6 per cent to Bt334, while PTT Exploration and Production was flat at Bt152. - The Nation