X0306 4/A 2017-03-31 2017-04-04 0 0001481582 Ryerson Holding Corp RYI 0001490657 Schnaufer Erich S C/O RYERSON HOLDING CORPORATION 227 W. MONROE ST., 27TH FLOOR CHICAGO IL 60606 0 1 0 0 Chief Financial Officer Restricted Stock Units 2017-03-31 4 A 0 8250 0 A Common Stock 8250 8250 D Each restricted stock unit represents a contingent right to receive one share of common stock of Ryerson Holding Corporation. The purpose of this amendment is to correct the number of shares reported under Columns 4, 7 and 9 of Table II. The original Form 4, filed April 4, 2017, erroneously reported 25,000 shares under Columns 4, 7 and 9 of Table II. On March 31, 2017, the reporting person was granted 8,250 restricted stock units, of which 2,750 vest on March 31, 2018, 2,750 vest on March 31, 2019 and 2,750 vest on March 31, 2020. Vested shares will be delivered to the reporting person not later than 60 days following such vesting dates. /s/ Camilla Rykke Merrick, attorney-in-fact 2018-04-03