X0206 3 2013-02-14 0 0001145404 CORNERSTONE THERAPEUTICS INC CRTX 0001570171 Chiesi U.S. Corp C/O CHIESI FARMACEUTICI SPA VIA PALERMO 26/A PARMA L6 43122 ITALY 0 0 1 0 Common Stock 15687538 D On February 14, 2013, Chiesi Farmaceutici SpA ("Chiesi SpA") transferred 15,687,538 shares to the Reporting Person. The Reporting Person is a wholly-owned subsidiary of Chiesi SpA. /s/ Danilo Piroli 2013-02-20