Mumbai, July 30 -- Primo Chemicals Ltd, Pioneer Embroideries Ltd, A2Z Infra Engineering Ltd and Oswal Green Tech Ltd are among the other gainers in the BSE's 'B' group today, 30 July 2026.GACM Technologies Ltd spiked 20.00% to Rs 0.6 at 12:01 IST. The stock was the biggest gainer in the BSE's 'B' group. On the BSE, 209.29 lakh shares were traded on the counter so far as against the average daily volumes of 9.42 lakh shares in the past one month. Primo Chemicals Ltd surged 15.04% to Rs 26.09. The stock was the second biggest gainer in 'B' group. On the BSE, 77731 shares were traded on the counter so far as against the average daily volumes of 15461 shares in the past one month. Pioneer Embroideries Ltd soared 11.20% to Rs 26.5. The stock w...