X0306 4/A 2017-03-31 2017-04-04 0 0001481582 Ryerson Holding Corp RYI 0001700923 Fang See Leong C/O RYERSON HOLDING CORPORATION 227 W. MONROE ST., 27TH FLOOR CHICAGO IL 60606 0 1 0 0 EVP Ops, Pres & CEO, Asia Restricted Stock Units 2017-03-31 4 A 0 4950 0 A Common Stock 4950 4950 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 15,000 shares under Columns 4, 7 and 9 of Table II. On March 31, 2017, the reporting person was granted 4,950 restricted stock units, of which 1,650 vest on March 31, 2018, 1,650 vest on March 31, 2019 and 1,650 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