Sec Form 4 Filing - HOFFMAN JAMES DONALD @ RELIANCE STEEL & ALUMINUM CO - 2023-02-17

FORM 4 Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940

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1. Name and Address of Reporting Person HOFFMAN JAMES DONALD 2. Issuer Name and Ticker or Trading Symbol RELIANCE STEEL & ALUMINUM CO [ RS] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) X __ Director _____ 10% Owner _____ Officer (give title below) _____ Other (specify below) (Last) (First) (Middle) 16100 N. 71ST STREET, SUITE 400 3. Date of Earliest Transaction (MM/DD/YY) 02/17/2023 (Street) SCOTTSDALE, AZ85254 4. If Amendment, Date Original Filed (MM/DD/YY) 6. Individual or Joint/Group Filing (Check Applicable Line) __ X __ Form filed by One Reporting Person _____ Form filed by More than One Reporting Person (City) (State) (Zip)

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned 1.Title of Security (Instr. 3) 2. Transaction Date (MM/DD/YY) 2A. Deemed Execution Date, if any (MM/DD/YY) 3. Transaction Code (Instr. 8) 4. Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5) 5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4) 6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 7. Nature of Indirect Beneficial Ownership (Instr. 4) Code V Amount (A) or (D) Price Common Stock 02/17/2023 A 139,114 D $ 0 158,794 D Common Stock 02/17/2023 F 60,405 D $ 247.9 98,389 D Common Stock 02/21/2023 S 5,896 D $ 241.76 ( 1 ) 89,437 I Held by Hoff Holdings Limited Partnership ( 2 ) Common Stock 02/21/2023 S 8,165 D $ 242.49 ( 3 ) 81,272 I Held by Hoff Holdings Limited Partnership ( 2 ) Common Stock 02/21/2023 S 1,400 D $ 243.29 ( 4 ) 79,872 I Held by Hoff Holdings Limited Partnership ( 2 ) Common Stock 02/21/2023 S 1,600 D $ 244.65 ( 5 ) 78,272 I Held by Hoff Holdings Limited Partnership ( 2 ) Common Stock 02/21/2023 S 1,761 D $ 246.82 ( 6 ) 76,511 I Held by Hoff Holdings Limited Partnership ( 2 ) Common Stock 02/21/2023 S 1,178 D $ 247.83 ( 7 ) 75,333 I Held by Hoff Holdings Limited Partnership ( 2 ) Common Stock 02/22/2023 S 1,273 D $ 242.33 ( 8 ) 74,060 I Held by Hoff Holdings Limited Partnership ( 2 ) Common Stock 02/22/2023 S 1,827 D $ 243.31 ( 9 ) 72,233 I Held by Hoff Holdings Limited Partnership ( 2 ) Common Stock 02/22/2023 S 1,300 D $ 244.12 ( 10 ) 70,933 I Held by Hoff Holdings Limited Partnership ( 2 ) Common Stock 02/22/2023 S 970 D $ 245.31 ( 11 ) 69,963 I Held by Hoff Holdings Limited Partnership ( 2 ) Common Stock 02/22/2023 S 11,795 D $ 246.63 ( 12 ) 58,168 I Held by Hoff Holdings Limited Partnership ( 2 ) Common Stock 02/22/2023 S 2,835 D $ 247.3 ( 13 ) 55,333 I Held by Hoff Holdings Limited Partnership ( 2 ) Common Stock 1,179 I Held by Trustee of Reliance Steel & Aluminum Co. Employee Stock Ownership Plan Common Stock 3,664 I Held by Trustee of Reliance Steel & Aluminum Co. 401(k) Plan

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned ( e.g. , puts, calls, warrants, options, convertible securities) 1. Title of Derivative Security (Instr. 3) 2. Conversion or Exercise Price of Derivative Security 3. Transaction Date (MM/DD/YY) 3A. Deemed Execution Date, if any (MM/DD/YY) 4. Transaction Code (Instr. 8) 5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4, and 5) 6. Date Exercisable and Expiration Date (MM/DD/YY) 7. Title and Amount of Underlying Securities (Instr. 3 and 4) 8. Price of Derivative Security (Instr. 5) 9. Number of Derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4) 10. Ownership Form of Derivative Security: Direct (D) or Indirect (I) (Instr. 4) 11. Nature of Indirect Beneficial Ownership (Instr. 4) Code V (A) (D) Date Exercisable Expiration Date Title Amount or Number of Shares

Reporting Owners Reporting Owner Name / Address Relationships Director 10% Owner Officer Other HOFFMAN JAMES DONALD 16100 N. 71ST STREET, SUITE 400 SCOTTSDALE, AZ85254 X Signatures /s/ James Donald Hoffman by William A. Smith II as his Attorney-in-Fact 02/22/2023 Signature of Reporting Person Date

Explanation of Responses:

( 1 )The price reported represents the weighted average sale price of the shares disposed of. The actual sale prices ranged from $241.05 to $242.05. 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. ( 2 )Hoff Holdings Limited Partnership ("Hoff Holdings") is a limited partnership of which a revocable trust established by the Reporting Person and his spouse is both the sole member of the sole general partner and also a limited partner, and various trusts for the benefit of the Reporting Person's spouse and his adult children are the other limited partners. The Reporting Person disclaims beneficial ownership over the Issuer's common stock held by Hoff Holdings except to the extent of his pecuniary interest therein. ( 3 )The price reported represents the weighted average sale price of the shares disposed of. The actual sale prices ranged from $242.05 to $243.04. 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. ( 4 )The price reported represents the weighted average sale price of the shares disposed of. The actual sale prices ranged from $243.08 to $243.77 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. ( 5 )The price reported represents the weighted average sale price of the shares disposed of. The actual sale prices ranged from $244.15 to $244.96. 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. ( 6 )The price reported represents the weighted average sale price of the shares disposed of. The actual sale prices ranged from $246.23 to $247.13. 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. ( 7 )The price reported represents the weighted average sale price of the shares disposed of. The actual sale prices ranged from $247.41 to $248.08. 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. ( 8 )The price reported represents the weighted average sale price of the shares disposed of. The actual sale prices ranged from $241.68 to $242.64. 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. ( 9 )The price reported represents the weighted average sale price of the shares disposed of. The actual sale prices ranged from $242.71 to $243.63. 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. ( 10 )The price reported represents the weighted average sale price of the shares disposed of. The actual sale prices ranged from $243.81 to $244.69. 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. ( 11 )The price reported represents the weighted average sale price of the shares disposed of. The actual sale prices ranged from $245.03 to $245.96. 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. ( 12 )The price reported represents the weighted average sale price of the shares disposed of. The actual sale prices ranged from $246.03 to $246.98. 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. ( 13 )The price reported represents the weighted average sale price of the shares disposed of. The actual sale prices ranged from $247.08 to $247.60. 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.

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.

* If the form is filed by more than one reporting person, see Instruction 4(b)(v).

** Intentional misstatements or omissions of facts constitute Federal Criminal Violations. See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).

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