As many as four companies, including Knack Packaging and Shivalaya Construction, have secured Sebi's approval to mobilise more than Rs 1,400 crore collectively through initial public offerings (IPOs), data with the markets regulator showed on Monday. Others which received regulatory nod are -- tiles and bathware maker Varmora Granito and Behari Lal Engineering. The four firms, which filed their preliminary IPO papers between August and September, obtained its observations during December 15-26. In Sebi's parlance, receipt of observations is equivalent to regulatory clearance to proceed with a public issue. On the other hand, Infifresh Foods, which filed its draft papers with Sebi in August using the confidential route, withdrew its prospectus, the update showed. According to the draft papers, packaging solutions provider Knack Packaging's IPO comprises fresh equity issue of Rs 475 crore, along with an offer for sale (OFS) of 70 lakh equity shares by promoters and an existing ...