Rubicon Research, Sai Life Sciences, Sanathan Textiles and Metalman Auto have received approval from the Securities and Exchange Board of India (Sebi) for their proposed initial public offers (IPOs).Pharmaceutical formulations company Rubicon Research’s IPO consists of a fresh issue of ₹500 crore and an offer for sale of ₹585 crore by the promoter General Atlantic Singapore RR. Contract research firm Sai Life Sciences’ IPO comprises a fresh issue of ₹800 crore and an OFS of 61.5 million shares. Sanathan Textiles’ IPO is a fresh issue of ₹500 crore and an OFS of up to ₹300 crore. Sheet metal maker Metalman Auto’s IPO comprises a fresh issue of ₹350 crore and an OFS of 12.6 million shares.