UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 8-K

CURRENT REPORT

Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934

Date of Report (Date of earliest event reported): May 20, 2013

ALEXANDRIA REAL ESTATE EQUITIES, INC.

(Exact name of registrant as specified in its charter)

Registrant’s telephone number, including area code:  (626) 578-0777

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:

o            Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)

o            Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)

o            Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))

o            Pre-commencement communications pursuant to Rule 13e-4 (c) under the Exchange Act (17 CFR 240.13e-4 (c))

Item 5.02              Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers.

On May 20, 2013, Martin A. Simonetti, due to a change in his occupation and pursuant to the Company’s Corporate Governance Guidelines, tendered his resignation as a director of Alexandria Real Estate Equities, Inc. (the “Company”), effective as of May 20, 2013.  Thereupon, the Board of Directors accepted Mr. Simonetti’s resignation.  There were no disagreements between Mr. Simonetti and the Company, or between the Company and Mr. Simonetti, on any matter relating to the Company’s operations, policies, practices, or strategy.

The Board of Directors of the Company thanks Mr. Simonetti for his loyal and dedicated service to the Company since 2005.

2

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

3