Sec Form 4 Filing - Biesterfeld Robert C Jr @ TRINITY INDUSTRIES INC - 2022-06-23

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 Biesterfeld Robert C Jr 2. Issuer Name and Ticker or Trading Symbol TRINITY INDUSTRIES INC [ NYSE/TRN] 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) 14221 N DALLAS PARKWAY, SUITE 1100 3. Date of Earliest Transaction (MM/DD/YY) 06/23/2022 (Street) DALLAS, TX75254 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 06/23/2022 P 49 ( 1 ) A $ 23.84 49 I By the Robert C. Biesterfeld Jr. Revocable Trust Common Stock 09/30/2022 S 38 ( 1 ) D $ 21.35 11 I By the Robert C. Biesterfeld Jr. Revocable Trust Common Stock 03/17/2023 P 24 ( 1 ) A $ 22.06 35 I By the Robert C. Biesterfeld Jr. Revocable Trust

V 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 (A) (D) Date Exercisable Expiration Date Title Amount or Number of Shares Trinity Phantom Stock Units $ 0 12/31/2024 A 776 ( 2 ) ( 2 ) Common Stock 776 $ 35.1 8,808 D

Reporting Owners Reporting Owner Name / Address Relationships Director 10% Owner Officer Other Biesterfeld Robert C Jr 14221 N DALLAS PARKWAY SUITE 1100 DALLAS, TX75254 X Signatures Phillip M. Kim For: Robert C. Biesterfeld Jr. 01/03/2025 Signature of Reporting Person Date

Explanation of Responses:

( 1 )Mr. Biesterfeld holds 35 shares of the common stock of Trinity Industries, Inc. (the "Company") through the Robert C. Biesterfeld Jr. Revocable Trust, of which he is the trustee and beneficiary. The trust's investments are actively managed by a third-party investment manager. At the time Mr. Biesterfeld joined the Company's Board of Directors on September 7, 2022, the trust held 49 shares of Company stock, which were inadvertently omitted from the Form 3 filed regarding his initial ownership of Company stock. The third-party investment manager erroneously executed the transactions described above during September 2022 and March 2023 contrary to Mr. Biesterfeld's instructions. Ownership of these shares and the related transactions were recently discovered, leading to this disclosure. ( 2 )The Trinity Phantom Stock Units were accrued under the Trinity Industries, Inc. Deferred Plan for Directors Fees. Stock units are converted at "1 - for - 1" (a rate of one stock unit per one share of Trinity common stock). Settlement of the account will be in cash after the reporting person's retirement.

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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