Mumbai, Feb. 20 -- MTAR Technologies Ltd, Avantel Ltd, Thomas Cook (India) Ltd and Godrej Industries Ltd are among the other gainers in the BSE's 'A' group today, 20 February 2025.Archean Chemical Industries Ltd surged 11.39% to Rs 464.9 at 11:47 IST. The stock was the biggest gainer in the BSE's 'A' group. On the BSE, 77189 shares were traded on the counter so far as against the average daily volumes of 47694 shares in the past one month. MTAR Technologies Ltd spiked 11.35% to Rs 1435.05. The stock was the second biggest gainer in 'A' group. On the BSE, 35904 shares were traded on the counter so far as against the average daily volumes of 9562 shares in the past one month. Avantel Ltd soared 10.74% to Rs 118.55. The stock was the third b...