Sec Form 4 Filing - Sintros Steven S @ UNIFIRST CORP - 2024-11-19

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 Sintros Steven S 2. Issuer Name and Ticker or Trading Symbol UNIFIRST CORP [ UNF] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) X __ Director _____ 10% Owner X __ Officer (give title below) _____ Other (specify below) President and CEO (Last) (First) (Middle) C/O UNIFIRST CORP, 68 JONSPIN ROAD 3. Date of Earliest Transaction (MM/DD/YY) 11/19/2024 (Street) WILMINGTON, MA01887 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 11/19/2024 S 1,771 ( 1 ) D $ 192.6 ( 2 ) 24,007 D Common Stock 11/19/2024 S 1,322 ( 1 ) D $ 193.52 ( 3 ) 22,685 D Common Stock 11/19/2024 S 114 ( 1 ) D $ 194.39 ( 4 ) 22,571 D Common Stock 11/19/2024 F 273 ( 5 ) D $ 192.83 22,298 D Common Stock 11/19/2024 A 3,421 ( 6 ) A $ 0 25,719 D Common Stock 11/19/2024 F 1,487 ( 5 ) D $ 192.83 24,232 D Common Stock 11/19/2024 A 4,668 ( 7 ) A $ 0 28,900 ( 8 ) D

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 Stock Appreciation Right ( 9 ) $ 192.83 11/19/2024 A 6,807 ( 9 ) 11/19/2034 Common Stock ($0.10 par value) 6,807 $ 0 6,807 D

Reporting Owners Reporting Owner Name / Address Relationships Director 10% Owner Officer Other Sintros Steven S C/O UNIFIRST CORP 68 JONSPIN ROAD WILMINGTON, MA01887 X President and CEO Signatures /s/ Andrea Ballute, Attorney-in-Fact 11/22/2024 Signature of Reporting Person Date

Explanation of Responses:

( 1 )Represents shares sold pursuant to a trading plan intended to comply with Rule 10b5-1(c) and adopted on August 16, 2024. ( 2 )The price reported is a weighted average price. The shares were sold in multiple transactions at prices ranging from $192.06 to $192.95, inclusive. The reporting person undertakes to provide to UniFirst Corporation, any security holder ofUniFirst Corporation, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within such range. ( 3 )The price reported is a weighted average price. The shares were sold in multiple transactions at prices ranging from $193.10 to $194.00, inclusive. The reporting person undertakes to provide to UniFirst Corporation, any security holder ofUniFirst Corporation, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within such range. ( 4 )The price reported is a weighted average price. The shares were sold in multiple transactions at prices ranging from $194.31 to $194.50, inclusive. The reporting person undertakes to provide to UniFirst Corporation, any security holder ofUniFirst Corporation, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within such range. ( 5 )Represents shares of Common Stock withheld by UniFirst Corporation to satisfy certain tax withholding obligations in connection with the vesting of certain restricted stock units. ( 6 )Represents restricted stock units that were earned based on the achievement of certain performance criteria and which vested. ( 7 )Represents restricted stock units granted under the UniFirst Corporation 2023 Stock Option and Incentive Plan (the "2023 Plan"). Such restricted stock units vest in three equal annual installments on October 31, 2025, October 31, 2026 and October 31, 2027. ( 8 )Consists of (i) 16,081 shares of Common Stock owned by the reporting person, (iii) 645 restricted stock units that will vest in one remaining annual installment on November 19, 2025, (iv) 1,493 restricted stock units that vest in two remaining equal annual installments on October 31, 2025 and October 31, 2026, (v) 2,363 restricted stock units that vest in three remaining equal annual installments on October 31, 2025, October 31, 2026 and October 31, 2027, (vi) 3,650 restricted stock units that vest in four equal annual installments on October 31, 2025, October 31, 2026, October 31, 2027 and October 31, 2028 and (vii) 4,668 restricted stock units that vest in three equal annual installments on October 31, 2025, October 31, 2026 and October 31, 2027 ( 9 )This stock appreciation right, which was granted under the 2023 Plan, becomes vested and exercisable in three equal annual installments on October 31, 2025, October 31, 2026 and October 31, 2027. This stock appreciation right is required to be settled in stock at the time of exercise.

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).

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