Mumbai, Dec. 15 -- Refex Industries Ltd, Transformers & Rectifiers India Ltd, Ion Exchange (India) Ltd and Aarti Industries Ltd are among the other gainers in the BSE's 'A' group today, 15 December 2025.Shakti Pumps (India) Ltd surged 11.73% to Rs 725.9 at 11:46 IST. The stock was the biggest gainer in the BSE's 'A' group. On the BSE, 17.12 lakh shares were traded on the counter so far as against the average daily volumes of 3.29 lakh shares in the past one month. Refex Industries Ltd spiked 9.20% to Rs 277.75. The stock was the second biggest gainer in 'A' group. On the BSE, 22.65 lakh shares were traded on the counter so far as against the average daily volumes of 2.18 lakh shares in the past one month. Transformers & Rectifiers India L...