X0306 4/A 2017-03-31 2017-04-04 0 0001481582 Ryerson Holding Corp RYI 0001614103 Lehner Edward J. C/O RYERSON HOLDING CORPORATION 227 W. MONROE ST., 27TH FLOOR CHICAGO IL 60606 0 1 0 0 President & CEO Restricted Stock Units 2017-03-31 4 A 0 31350 0 A Common Stock 31350 31350 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 95,000 shares under Columns 4, 7 and 9 of Table II. On March 31, 2017, the reporting person was granted 31,350 restricted stock units, of which 10,450 vest on March 31, 2018, 10,450 vest on March 31, 2019 and 10,450 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