Sec Form 4 Filing - Sessa Daniel M @ LENNOX INTERNATIONAL INC - 2025-07-23

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

OMB APPROVAL OMB Number: 3235-0287 Expires: November 30, 2011 Estimated average burden hours per response... 0.5

1. Name and Address of Reporting Person Sessa Daniel M 2. Issuer Name and Ticker or Trading Symbol LENNOX INTERNATIONAL INC [ LII] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) _____ Director _____ 10% Owner X __ Officer (give title below) _____ Other (specify below) EVP, Chief HR Officer (Last) (First) (Middle) 2140 LAKE PARK BLVD. 3. Date of Earliest Transaction (MM/DD/YY) 07/23/2025 (Street) RICHARDSON, TX75080 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, Par Value $0.01 Per Share 07/23/2025 S 54 D $ 658.61 34,302 D Common Stock, Par Value $0.01 Per Share 07/23/2025 S 32 D $ 661.51 34,270 D Common Stock, Par Value $0.01 Per Share 07/23/2025 S 147 D $ 663.2369 ( 1 ) 34,123 D Common Stock, Par Value $0.01 Per Share 07/23/2025 S 16 D $ 663.76 34,107 D Common Stock, Par Value $0.01 Per Share 07/23/2025 S 66 D $ 669.1252 ( 2 ) 34,041 D Common Stock, Par Value $0.01 Per Share 07/23/2025 S 21 D $ 670.2714 ( 3 ) 34,020 D Common Stock, Par Value $0.01 Per Share 07/23/2025 S 35 D $ 672 33,985 D Common Stock, Par Value $0.01 Per Share 07/23/2025 S 21 D $ 673.3705 ( 4 ) 33,964 D Common Stock, Par Value $0.01 Per Share 07/23/2025 S 65 D $ 674.6431 ( 5 ) 33,899 D Common Stock, Par Value $0.01 Per Share 07/23/2025 S 62 D $ 677.0561 ( 6 ) 33,837 D Common Stock, Par Value $0.01 Per Share 07/23/2025 S 43 D $ 678.6591 ( 7 ) 33,794 D Common Stock, Par Value $0.01 Per Share 07/23/2025 S 52 D $ 680.0004 ( 8 ) 33,742 D Common Stock, Par Value $0.01 Per Share 07/23/2025 S 4 D $ 681.5575 ( 9 ) 33,738 D Common Stock, Par Value $0.01 Per Share 07/23/2025 S 7 D $ 682.91 33,731 D Common Stock, Par Value $0.01 Per Share 07/23/2025 S 4 D $ 685.325 ( 10 ) 33,727 D Common Stock, Par Value $0.01 Per Share 07/23/2025 S 10 D $ 687.63 33,717 D Common Stock, Par Value $0.01 Per Share 07/23/2025 S 2,143 D $ 670 31,574 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

Reporting Owners Reporting Owner Name / Address Relationships Director 10% Owner Officer Other Sessa Daniel M 2140 LAKE PARK BLVD. RICHARDSON, TX75080 EVP, Chief HR Officer Signatures /s/ Monica M. Brown, attorney-in-fact for Daniel M. Sessa 07/24/2025 Signature of Reporting Person Date

Explanation of Responses:

( 1 )Reflects a weighted average sale price of $663.2369 at prices ranging from $662.560 to $663.370 per share. The Reporting Person will provide, upon request by the staff of the Securities and Exchange Commission, the Issuer, or a security holder of the Issuer, full information regarding the number of shares sold at each separate price. ( 2 )Reflects a weighted average sale price of $669.1252 at prices ranging from $669.030 to $670.010 per share. The Reporting Person will provide, upon request by the staff of the Securities and Exchange Commission, the Issuer, or a security holder of the Issuer, full information regarding the number of shares sold at each separate price. ( 3 )Reflects a weighted average sale price of $670.2714 at prices ranging from $670.090 to $670.290 per share. The Reporting Person will provide, upon request by the staff of the Securities and Exchange Commission, the Issuer, or a security holder of the Issuer, full information regarding the number of shares sold at each separate price. ( 4 )Reflects a weighted average sale price of $673.3705 at prices ranging from $673.040 to $673.970 per share. The Reporting Person will provide, upon request by the staff of the Securities and Exchange Commission, the Issuer, or a security holder of the Issuer, full information regarding the number of shares sold at each separate price. ( 5 )Reflects a weighted average sale price of $674.6431 at prices ranging from $674.400 to $675.000 per share. The Reporting Person will provide, upon request by the staff of the Securities and Exchange Commission, the Issuer, or a security holder of the Issuer, full information regarding the number of shares sold at each separate price. ( 6 )Reflects a weighted average sale price of $677.0561 prices ranging from $676.950 to $677.270 per share. The Reporting Person will provide, upon request by the staff of the Securities and Exchange Commission, the Issuer, or a security holder of the Issuer, full information regarding the number of shares sold at each separate price. ( 7 )Reflects a weighted average sale price of $678.6591 at prices ranging from $678.350 to $678.880 per share. The Reporting Person will provide, upon request by the staff of the Securities and Exchange Commission, the Issuer, or a security holder of the Issuer, full information regarding the number of shares sold at each separate price. ( 8 )Reflects a weighted average sale price of $680.0004 at prices ranging from $679.840 to $680.100 per share. The Reporting Person will provide, upon request by the staff of the Securities and Exchange Commission, the Issuer, or a security holder of the Issuer, full information regarding the number of shares sold at each separate price. ( 9 )Reflects a weighted average sale price of $681.5575 at prices ranging from $681.360 to $681.710 per share. The Reporting Person will provide, upon request by the staff of the Securities and Exchange Commission, the Issuer, or a security holder of the Issuer, full information regarding the number of shares sold at each separate price. ( 10 )Reflects a weighted average sale price of $685.325 at prices ranging from $685.100 to $686.000 per share. The Reporting Person will provide, upon request by the staff of the Securities and Exchange Commission, the Issuer, 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).

Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.