Statement of Changes in Beneficial Ownership (Form 4)

FORM 4 Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b). Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

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

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(Print or Type Responses)

1. Name and Address of Reporting Person * Sepe Matthew Joseph 2. Issuer Name and Ticker or Trading Symbol Lumentum Holdings Inc. [LITE] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) _____ Director _____ 10% Owner __X__ Officer (give title below) _____ Other (specify below) CHIEF ACCOUNTING OFFICER (Last) (First) (Middle) C/O LUMENTUM HOLDINGS INC., 1001 RIDDER PARK DRIVE 3. Date of Earliest Transaction (Month/Day/Year) 08/19/2025 (Street) SAN JOSE, CA 95131 4. If Amendment, Date Original Filed (Month/Day/Year) 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 (Month/Day/Year) 2A. Deemed Execution Date, if any (Month/Day/Year) 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 08/19/2025 A(1) 5,057 A $ 0 42,648 D Common Stock 08/21/2025 A(2) 4,519 A $ 0 47,167 D Common Stock 08/21/2025 F(3) 4,309 D $117.43 42,858 D

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
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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 (Month/Day/Year)

3A. Deemed Execution Date, if any (Month/Day/Year)

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 (Month/Day/Year)

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
Sepe Matthew Joseph C/O LUMENTUM HOLDINGS INC. 1001 RIDDER PARK DRIVE SAN JOSE, CA 95131			CHIEF ACCOUNTING OFFICER

Signatures

/s/ Jae Kim as Attorney-in-Fact		08/21/2025
**Signature of Reporting Person		Date

Explanation of Responses:

*	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).
(1)	These securities are restricted stock units ("RSUs"). Each RSU represents a contingent right to receive, following vesting, one share of the Issuer's Common Stock. 100% of the shares shall vest on the one-year anniversary of the grant date, subject to the Reporting Person continuing to be an employee through such date, or as provided under the Issuer's 2015 Equity Incentive Plan.
(2)	Represents the acquisition of shares upon the determination of the Compensation Committee of the Board of Directors of the Issuer that certain performance conditions were met with respect to certain performance stock units ("PSUs") granted to the Reporting Person on August 21, 2024.
(3)	Represents shares that have been withheld by the Issuer to satisfy income tax withholding and remittance obligations in connection with the vesting of RSUs and PSUs.

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