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 ^* CD&R Investment Associates IX, Ltd.	2. Issuer Name and Ticker or Trading Symbol BEACON ROOFING SUPPLY INC [ BECN ]	5. Relationship of Reporting Person(s) to Issuer (Check all applicable) _____ Director __X__ 10% Owner _____ Officer (give title below) _____ Other (specify below)
(Last) (First) (Middle) C/O M+C CORPORATE SERVICES LIMITED, P.O. BOX 309 UGLAND HSE, SOUTH CHURCH ST	3. Date of Earliest Transaction (MM/DD/YYYY) 9/25/2019
(Street) GEORGE TOWN, E9 KY1-1104 (City) (State) (Zip)	4. If Amendment, Date Original Filed (MM/DD/YYYY)	6. Individual or Joint/Group Filing (Check Applicable Line) ___ Form filed by One Reporting Person _ X _ 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)
1.Title of Security (Instr. 3)	2. Trans. Date	2A. Deemed Execution Date, if any	Code	V	Amount	(A) or (D)	Price		6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
Common Stock	9/25/2019		P		3207200	A	$32.0799	13757361	I ⁽¹⁾	By affiliate

*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)
1. Title of Derivate Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Trans. Date	3A. Deemed Execution Date, if any	Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares	8. Price of Derivative Security (Instr. 5)			11. Nature of Indirect Beneficial Ownership (Instr. 4)

Explanation of Responses:

(1)

These securities are owned directly by CD&R Boulder Holdings, L.P. ("CD&R Stockholder"). CD&R Associates IX, Ltd., as the general partner of CD&R Stockholder may be deemed to beneficially own the shares of common stock held by CD&R Stockholder. CD&R Investment Associates IX, Ltd. expressly disclaims beneficial ownership of the shares of common stock held by CD&R Stockholder, except to the extent of its pecuniary interest therein.

Reporting Owners
Reporting Owner Name / Address	Relationships
Reporting Owner Name / Address	Director	10% Owner	Officer	Other
CD&R Investment Associates IX, Ltd. C/O M+C CORPORATE SERVICES LIMITED P.O. BOX 309 UGLAND HSE, SOUTH CHURCH ST GEORGE TOWN, E9 KY1-1104		X
CD&R Boulder Holdings, L.P. C/O M+C CORPORATE SERVICES LIMITED P.O. BOX 309 UGLAND HSE, SOUTH CHURCH ST GEORGE TOWN, E9 KY1-1104		X

Signatures
CD&R Investment Associates IX, Ltd., By: /s/ Theresa A. Gore, VP, Treas. and Asst. Sec.		9/25/2019
^**Signature of Reporting Person		Date
CD&R Boulder Holdings, L.P., By: CD&R Investment Associates IX, Ltd, general partner; By: /s/ Theresa A. Gore, Vice President, Treasurer and Assistant Secretary		9/25/2019
^**Signature of Reporting Person		Date

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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 control number.