Statement of Changes in Beneficial Ownership (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).

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP OF SECURITIES

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Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934 or Section 30(h) of the Investment Company Act of 1940

1. Name and Address of Reporting Person * NOGLOWS WILLIAM P	2. Issuer Name and Ticker or Trading Symbol CMC Materials, Inc. [ CCMP ]	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) C/O CMC MATERIALS, INC., 870 COMMONS DRIVE	3. Date of Earliest Transaction (MM/DD/YYYY) 9/3/2021
(Street) AURORA, IL 60504 (City)        (State)        (Zip)	4. If Amendment, Date Original Filed (MM/DD/YYYY)	6. Individual or Joint/Group Filing (Check Applicable Line) _X _ Form filed by One Reporting Person ___ Form filed by More than One Reporting Person

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1.Title of Security (Instr. 3)	2. Trans. Date	2A. Deemed Execution Date, if any	3. Trans. 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	9/3/2021		I		7500	D	$0 (1)	33625	I	Trust
Common Stock	9/3/2021		I		7500	A	$0 (2)	7500	I	Trust
Common Stock	9/7/2021		I		7500	D	$0 (3)	26125	I	Trust
Common Stock	9/7/2021		I		7500	A	$0 (4)	7500	I	Trust

Table II - Derivative Securities Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivate Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Trans. Date	3A. Deemed Execution Date, if any	4. Trans. 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		7. Title and Amount of Securities Underlying Derivative Security (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

Explanation of Responses:
(1)	Transfer of shares from Mrs. Noglows trust to a trust for the benefit of a child of Mr. and Mrs. Noglows, as to which Mr. Noglows has investment and voting, but no ownership, control.
(2)	Represents shares that are held in trust for the benefit of a child of Mr. and Mrs. Noglows, as to which Mr. Noglows has investment and voting, but no ownership, control. He is not deemed the beneficial owner of such shares for Section 16 purposes but wishes to continue to report these shares on a voluntary basis.
(3)	Transfer of shares from Mrs. Noglows trust to a trust for the benefit of a child of Mr. and Mrs. Noglows, as to which Mr. Noglows has investment and voting, but no ownership, control.
(4)	Represents shares that are held in trust for the benefit of Mr. and Mrs. Noglows' child, as to which Mr. Noglows has investment and voting control, but no ownership, control. He is not deemed the beneficial owner of such shares for Section 16 purposes but wishes to continue to report these shares on a voluntary basis.

Reporting Owners
Reporting Owner Name / Address	Relationships
	Director	10% Owner	Officer	Other
NOGLOWS WILLIAM P C/O CMC MATERIALS, INC. 870 COMMONS DRIVE AURORA, IL 60504	X

Signatures
/s/ H. Carol Bernstein (Power of Attorney)		9/8/2021
**Signature of Reporting Person		Date