SET keeps eye on surging Delta Electronics shares Firm attributes gain to right strategy published : 29 Dec 2020 at 07:11 16 The Stock Exchange of Thailand (SET) is closely monitoring the volatility of Delta Electronics Thailand's shares, which have surged 250% in one month, 400% in three months and 1,400% in a year. The SET is keeping an eye on shares with low free float and small supply that have increased exponentially in value over the past year. In one day, Delta shares reached an all-time high of 838 baht, up 22% in the morning before dropping an hour before the market closed to end the day at 560 baht, down 18.1% from the previous day, in trade worth 12.2 million baht.