The initial public offering (IPO) of Zetwerk Manufacturing Business saw a pick-up in investor interest on the last day of bidding, with the issue receiving 47 percent subscription by 11:10 am on October 19, according to NSE data. The Rs 5,012.33-crore IPO received bids for 8,72,70,777 shares against 18,50,66,845 shares on offer. The qualified institutional buyer (QIB) category led demand with 57% subscription, followed by retail investors at 44%.