13D Filing: Ontario Teachers Pension Plan Board and Macerich Co (MAC)

This Amendment No. 3 (this Amendment No. 3) amends and supplements the
statement on Schedule 13D filed with the Securities and Exchange Commission (the SEC) on November 24, 2014 (the Original Schedule 13D), Amendment No. 1 to the Original Schedule 13D filed with the SEC on May 8,
2015 (Amendment No. 1) and Amendment No. 2 to the Original Schedule 13D filed with the SEC on May 15, 2015 (Amendment No. 2, and together with the Original Schedule 13D, Amendment No. 1 and this
Amendment No. 3, the Schedule 13D) with respect to the common stock, par value $0.01 per share (the Common Stock), of The Macerich Company, a Maryland corporation (the Issuer), filed by Ontario Teachers
Pension Plan Board, an Ontario, Canada corporation (Teachers), and 1700480 Ontario Inc., an Ontario, Canada corporation (1700480), wholly owned by Teachers. Capitalized terms used herein and not otherwise defined
have the meanings assigned to such terms in the Original Schedule 13D. All items or responses not described herein remain as previously reported in the Original Schedule 13D, as amended and supplemented by Amendment No. 1 and Amendment
No. 2.

All calculations with respect to beneficial ownership of the Issuers Common Stock set forth in this Schedule 13D are
based on 149,149,560 shares of Common Stock outstanding as of February 22, 2016, as reported on the cover of the Issuers Annual Report on Form 10-K for the fiscal year ended December 31, 2015 (the Form 10-K), filed with
the SEC by the Issuer on February 23, 2016.

Item 2 of the Schedule 13D is hereby amended solely with
respect to Schedule A and Schedule B attached hereto.

Item 3 of the Schedule 13D is
hereby amended and supplemented by adding the following immediately after the last paragraph thereof:

The 1,186,000 shares of Common
Stock acquired by 1700480 between May 18, 2015 and May 19, 2015 reported herein were acquired at an aggregate purchase price of $98,693,989. The source of the funds used to purchase such shares of Common Stock was a capital contribution to
equity by 1700480s parent, Teachers.

In addition, according to its Form 10-K, the Issuer repurchased 9,333,590 shares of its
Common Stock between November 12, 2015 and February 17, 2016. As a result of the acquisition of shares of Common Stock by 1700480 and the Issuers repurchase of its Common Stock, the Reporting Persons beneficial ownership
percentage increased approximately 1.7% to 15.6%, with 0.9% of the approximately 1.7% increase due to the Issuers repurchase of its Common Stock.

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