Mumbai, Jan. 7 -- Thangamayil Jewellery Ltd, PC Jeweller Ltd, Concord Biotech Ltd and Sonata Software Ltd are among the other gainers in the BSE's 'A' group today, 07 January 2026.Elecon Engineering Company Ltd surged 7.86% to Rs 516.7 at 11:45 IST. The stock was the biggest gainer in the BSE's 'A' group. On the BSE, 2.33 lakh shares were traded on the counter so far as against the average daily volumes of 73958 shares in the past one month. Thangamayil Jewellery Ltd soared 6.91% to Rs 3722.3. The stock was the second biggest gainer in 'A' group. On the BSE, 28389 shares were traded on the counter so far as against the average daily volumes of 11624 shares in the past one month. PC Jeweller Ltd spiked 6.25% to Rs 10.88. The stock was the ...