Paritat Lerngutai, managing director of SCB Quant, said the product - called ROCA - was a derivative investment whose performance is linked to the movement of three blue-chip Thai stocks: PTT, Siam Cement, and Kasikornbank. As long as the prices of the stocks rise or fall by no more than 15 per cent over nine months, investors are guaranteed to earn up to 8.8 per cent per annum. They also have the opportunity to receive their principal back before maturity, and get a capital guarantee by SCB Securities of up to 80 per cent. - The Nation.