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 * Mirchandani Sanjay 2. Issuer Name and Ticker or Trading Symbol COMMVAULT SYSTEMS INC [CVLT] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) __X__ Director _____ 10% Owner __X__ Officer (give title below) _____ Other (specify below) President & CEO (Last) (First) (Middle) 1 COMMVAULT WAY 3. Date of Earliest Transaction (Month/Day/Year) 05/15/2026 (Street) TINTON FALLS, NJ 07724 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(1) 05/15/2026 M 926 A $ 0 273,080(2) D Common Stock(3) 05/15/2026 A 70,150 A $ 0 343,230(2) D Common Stock(4) 05/18/2026 S 8,457 D $104.54 334,773(2) D

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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

Performance Stock Units

(1)

05/15/2026

M

0

(1)

(1)

Common Stock

926

(1)

0 (1)

D

Reporting Owners

Reporting Owner Name / Address	Relationships
	Director	10% Owner	Officer	Other
Mirchandani Sanjay 1 COMMVAULT WAY TINTON FALLS, NJ 07724	X		President & CEO

Signatures

/s/ Danielle Abrahamsen, Attorney-in-Fact		05/19/2026
**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)	Granted on May 15, 2025, represents 926 performance stock units ("PSUs") vested on the first anniversary of the grant date. The remaining 1,879 earned PSUs from this award, previously reported on Table II, are included in the Table I balance, subject to time-based vesting through May 15, 2028. Each PSU represents the right to receive one share of common stock.
(2)	The amount of securities beneficially owned includes (a) shares of Common Stock owned outright by the Reporting Person and (b) shares underlying earned PSUs and restricted stock units ("RSUs") that remain subject to time-based vesting criteria. The amount excludes the following shares mistakenly included in prior Forms 4: (i) 12,968 shares attributable to a total shareholder return ("TSR") PSU award granted on May 15, 2023, (ii) 22,778 shares attributable to a TSR PSU award granted on May 15, 2024, (iii) 25,497 shares attributable to a TSR PSU award granted on May 15, 2025, and (iv) 1,011 shares to correct a historical balance discrepancy. Going forward, PSUs will be reported on Form 4 in Table I once earned.
(3)	The common stock is being granted as RSUs and is subject to a 3-year vesting schedule, as follows: 33% will vest on the first anniversary of the grant date and 8.375% will vest at the end of each successive three-month period thereafter.
(4)	Represents shares automatically sold solely to satisfy tax withholding obligations of the Reporting Person on vesting of restricted stock. Proceeds from the sale were submitted to the Internal Revenue Service.

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