X0306 4 2022-04-06 0000861884 RELIANCE STEEL & ALUMINUM CO RS 0001447652 HOFFMAN JAMES DONALD 350 SOUTH GRAND AVENUE SUITE 5100 LOS ANGELES CA 90071 1 1 0 0 CEO Common Stock 2022-04-06 4 S 0 1400 177.55 D 161338 D Common Stock 2022-04-06 4 S 0 6600 178.52 D 154738 D Common Stock 2022-04-06 4 S 0 1500 179.32 D 153238 D Common Stock 2022-04-06 4 S 0 500 180.24 D 152738 D Common Stock 1163 I Held by Trustee of Reliance Steel & Aluminum Co. Employee Stock Ownership Plan Common Stock 3646 I Held by Trustee of Reliance Steel & Aluminum Co. 401(k) Plan The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on November 28, 2021. The price reported represents the weighted average sale price of the shares disposed of. The actual sale prices ranged from $176.88 to $177.87. The Reporting Person has provided to the Issuer, and hereby undertakes to provide upon request by the U.S. Securities and Exchange Commission staff or a security holder of the Issuer, full information regarding the number of shares sold at each separate price. The price reported represents the weighted average sale price of the shares disposed of. The actual sale prices ranged from $177.99 to $178.94. The Reporting Person has provided to the Issuer, and hereby undertakes to provide upon request by the U.S. Securities and Exchange Commission staff or a security holder of the Issuer, full information regarding the number of shares sold at each separate price. The price reported represents the weighted average sale price of the shares disposed of. The actual sale prices ranged from $179.03 to $179.98. The Reporting Person has provided to the Issuer, and hereby undertakes to provide upon request by the U.S. Securities and Exchange Commission staff or a security holder of the Issuer, full information regarding the number of shares sold at each separate price. The price reported represents the weighted average sale price of the shares disposed of. The actual sale prices ranged from $180.15 to $180.44. The Reporting Person has provided to the Issuer, and hereby undertakes to provide upon request by the U.S. Securities and Exchange Commission staff or a security holder of the Issuer, full information regarding the number of shares sold at each separate price. /s/ James Donald Hoffman by William A. Smith II as his Attorney-in-Fact 2022-04-08