Form Type: 4

Accession Number:	0001580863-21-000051
Date:	2021-05-11
Issuer:	MASONITE INTERNATIONAL CORP (DOOR)
Original Submission Date:

Reporting Person:

CHUANG JOHN H.
501 BOYLSTON STREET
3RD FLOOR BOSTON, MA 02116

Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
Title of Security	Transaction Date	2a. Deemed Execution Date	Transaction Code	Shares	Acquired or Disposed	Price per share	5. Amount of Securities Beneficially Owned Following Reported Transaction	6. Ownership Form Direct or Indirect	Nature of Indirect Ownership
COMMON SHARES	2021-05-11		P	909	a	$122.65	909	indirect
COMMON SHARES	2021-05-11		P	798	a	$123.46	1,707	indirect
COMMON SHARES	2021-05-11		P	6,400	a	$124.89	8,107	indirect
COMMON SHARES	2021-05-11		P	1,893	a	$125.34	10,000	indirect

Derivative Securities Acquired, Disposed of, or Beneficially Owned
(e.g., puts, calls, warrants, convertible securities
Title of Derivative Security	Conversion or Exercise Price of Derivative Security	Transaction Date	Deemed Execution Date	Transaction Code	Number of Derivative Securities Acquired (A) or Disposed of (D)	Date Exercisable	Expiration Date	Title and Amount of Securities Underlying Derivative Security	Price of Derivative Security	Number of derivative Securities Beneficially Owned Following Reported Transaction(s)	Ownership Form: Direct (D) or Indirect (I)	Nature of Indirect Beneficial Ownership

Footnotes
ID	footnote
f1	the price reported in column 4 is a weighted average price. these shares were purchased in multiple transactions ranging from $121.95 to $122.92, inclusive. the reporting person undertakes to provide to the issuer, any security holder of the issuer, or the staff of the securities and exchange commission, upon request, full information regarding the number of shares purchased at each separate price within the range set forth above.
f2	the reporting person disclaims beneficial ownership of these securities, except to the extent of his pecuniary interest therein, and this report shall not be deemed an admission that the reporting person is the beneficial owner of the securities for purposes of section 16 of the securities exchange act of 1934 or for any other purpose.
f3	the price reported in column 4 is a weighted average price. these shares were purchased in multiple transactions ranging from $122.96 to $123.75, inclusive. the reporting person undertakes to provide to the issuer, any security holder of the issuer, or the staff of the securities and exchange commission, upon request, full information regarding the number of shares purchased at each separate price within the range set forth above.
f4	the price reported in column 4 is a weighted average price. these shares were purchased in multiple transactions ranging from $124.13 to $125.13, inclusive. the reporting person undertakes to provide to the issuer, any security holder of the issuer, or the staff of the securities and exchange commission, upon request, full information regarding the number of shares purchased at each separate price within the range set forth above.
f5	the price reported in column 4 is a weighted average price. these shares were purchased in multiple transactions ranging from $125.13 to $125.66, inclusive. the reporting person undertakes to provide to the issuer, any security holder of the issuer, or the staff of the securities and exchange commission, upon request, full information regarding the number of shares purchased at each separate price within the range set forth above.

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