On Thursday, shares of Star Delta Transformers Ltd surged 18.4% to ₹680, with volumes spiking over 10 times on the BSE. The stock has a 52-week high of ₹1,295.60 and low of ₹482.05. The company reported an unexecuted order book of about ₹236.69 crore (inclusive of GST), highlighting strong business momentum.