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 Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940

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1. Name and Address of Reporting Person * ONTARIO TEACHERS PENSION PLAN BOARD   2. Issuer Name and Ticker or Trading Symbol MACERICH CO [MAC] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) __X__ Director __X__ 10% Owner _____ Officer (give title below) _____ Other (specify below) (Last) (First) (Middle) 5650 YONGE STREET, 3RD FLOOR 3. Date of Earliest Transaction (Month/Day/Year) 05/18/2015 (Street) TORONTO, ONTARIO, Z4 M2M 4H5 4. If Amendment, Date Original Filed(Month/Day/Year) 6. Individual or Joint/Group Filing(Check Applicable Line) ___ Form filed by One Reporting Person _X_ 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, par value $0.01 per share 05/18/2015   P   496,500 A $ 83.45 (1) 22,569,055 I See Note (2) (4) Common Stock, par value $0.01 per share 05/19/2015   P   689,500 A $ 83.05 (3) 23,258,555 I See Note (2) Common Stock, par value $0.01 per share               27,682 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

Reporting Owners

Reporting Owner Name / Address	Relationships
	Director	10% Owner	Officer	Other
ONTARIO TEACHERS PENSION PLAN BOARD 5650 YONGE STREET, 3RD FLOOR TORONTO, ONTARIO, Z4 M2M 4H5	X	X
1700480 ONTARIO INC 20 QUEEN STREET WEST TORONTO, A6 M5H 3R4	X	X

Signatures

/s/ Sandra Hardy, Authorized Person on behalf of 1700480 Ontario Inc.		05/20/2015
**Signature of Reporting Person		Date
/s/ Rossana Di Lieto, Chief Compliance Officer on behalf of Ontario Teachers' Pension Plan		05/20/2015
**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)	The price reported in Column 4 is a weighted average price. These shares of Common Stock were purchased in multiple transactions at prices ranging from $83.42 to $83.46, inclusive. The reporting persons undertake to provide The Macerich Company, any security holder of The Macerich Company, 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 ranges set forth in footnotes (1) and (3) to this Form 4.
(2)	23,258,555 shares of Common Stock are owned directly by 1700480 Ontario Inc., which is a wholly owned subsidiary of Ontario Teachers' Pension Plan. Ontario Teachers' Pension Plan is an indirect beneficial owner of such reported securities.
(3)	The price reported in Column 4 is a weighted average price. These shares of Common Stock were purchased in multiple transactions at prices ranging from $82.97 to $83.07, inclusive.
(4)	Ontario Teachers' Pension Plan and 1700480 Ontario Inc. are directors by deputization for purposes of Section 16 of the Securities Exchange Act of 1934.

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