X0407 4 2023-03-31 0001481582 Ryerson Holding Corp RYI 0001848292 Sundarrajan Alagu C/O RYERSON HOLDING CORPORATION 227 W. MONROE ST., 27TH FLOOR CHICAGO IL 60606 true Chief Information Officer false Common Stock (par value ($0.01 per share) 2023-03-31 4 M 0 1719.53 0 A 21868.7059 D Common Stock (par value ($0.01 per share) 2023-03-31 4 M 0 1700.9735 0 A 23569.6794 D Common Stock (par value ($0.01 per share) 2023-03-31 4 M 0 1684.3091 0 A 25253.9885 D Common Stock (par value ($0.01 per share) 2023-03-31 4 M 0 5000 0 A 30253.9885 D Common Stock (par value ($0.01 per share) 2023-03-31 4 F 0 3770 36.38 D 26483.9885 D Restricted Stock Units 2023-03-31 4 M 0 1719.53 0 D Common Stock 1719.53 0 D Restricted Stock Units 2023-03-31 4 M 0 1700.9735 0 D Common Stock 1700.9735 1700.9735 D Restricted Stock Units 2023-03-31 4 M 0 1684.3091 0 D Common Stock 1684.3091 3368.6182 D Restricted Stock Units 2023-03-31 4 A 0 5775 0 A Common Stock 5775 5775 D See Exhibit 99.1. See Exhibit 99.1. See Exhibit 99.1. See Exhibit 99.1. See Exhibit 99.1. See Exhibit 99.1. See Exhibit 99.1. See Exhibit 99.1. See Exhibit 99.1. See Exhibit 99.1. See Exhibit 99.1. See Exhibit 99.1. Exhibit 99.1 - Explanation of Responses /s/ Camilla Rykke Merrick, attorney-in-fact 2023-04-04