Somnigroup rises after former Mattress Firm parent's stock sale at a premium

** Shares of bedding firm Somnigroup SGI.N up 4.5% at $63.22 amid broader market rally after secondary offering

** Lexington, Kentucky-based co early Mon said ~15.4 mln shares offloaded by subsidiary of IBEX Topco B.V., former majority shareholder of Mattress Firm

** Offering priced at $62, thefly.com reports, which is 2.5% above stock's last sale of $60.50 on Fri

** Netherlands-based IBEX, formerly known as Steinhoff Topco, divests 7.4% stake

** Goldman Sachs sole underwriter for offering

** In Feb, Tempur Sealy completed $4 bln deal to buy Mattress Firm, and announced name change to Somnigroup

** Steinhoff International bought Mattress Firm in ~$3.8 bln deal in 2016

** SGI has ~208.6 mln shares outstanding for about $13 bln market cap

** With move on Mon, stock up nearly 12% YTD