Mumbai, Aug. 4 -- PSP Projects Ltd, BirlaNu Ltd, Kabra Extrusion Technik Ltd and Vishnu Chemicals Ltd are among the other losers in the BSE's 'B' group today, 04 August 2025.Zim Laboratories Ltd lost 19.98% to Rs 86.3 at 14:28 IST.The stock was the biggest loser in the BSE's 'B' group.On the BSE, 1.55 lakh shares were traded on the counter so far as against the average daily volumes of 14020 shares in the past one month.PSP Projects Ltd crashed 12.88% to Rs 661.7. The stock was the second biggest loser in 'B' group.On the BSE, 2.44 lakh shares were traded on the counter so far as against the average daily volumes of 5977 shares in the past one month.BirlaNu Ltd tumbled 11.26% to Rs 1979.45. The stock was the third biggest loser in 'B' gro...