X0508 4 2023-08-18 0000861884 RELIANCE STEEL & ALUMINUM CO RS 0001121844 KAMINSKI MARK V C/O RELIANCE STEEL & ALUMINUM CO. 16100 N. 71ST STREET, SUITE 400 SCOTTSDALE AZ 85254 1 0 0 0 0 Common Stock 2023-08-18 4 S 0 368 276.36 D 15114 D Common Stock 2023-08-18 4 S 0 2371 277.44 D 12743 D Common Stock 2023-08-18 4 S 0 2261 278.09 D 10482 D Common Stock 2023-08-18 4 S 0 431 276.62 D 13046 I By Elizabeth S. Kaminski Gift Trust dtd 12/14/12 Common Stock 2023-08-18 4 S 0 2748 277.52 D 10298 I By Elizabeth S. Kaminski Gift Trust dtd 12/14/12 Common Stock 2023-08-18 4 S 0 1821 278.17 D 8477 I By Elizabeth S. Kaminski Gift Trust dtd 12/14/12 The price reported represents the weighted average sale price of the shares disposed of. The actual sale prices ranged from $275.84 to $276.71. 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 $276.90 to $277.89. 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 $277.99 to $278.44. 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. The price reported represents the weighted average sale price of the shares disposed of. The actual sale prices ranged from $275.98 to $276.96. 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 $277.00 to $278.00. 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 $278.01 to $278.51. 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/ Mark V. Kaminski by William A. Smith II as his Attorney-in-Fact 2023-08-22