JOINT FILING AGREEMENT

EXHIBIT 99.1

JOINT FILING AGREEMENT

The undersigned hereby agree that the Statement on Schedule 13G filed herewith (and any amendments thereto), relating to the Common Stock of Adtran, Inc., a Delaware corporation, is being filed jointly with the Securities and Exchange Commission pursuant to Rule 13d-1(c) under the Securities Exchange Act of 1934, as amended, on behalf of each of the undersigned.

This Agreement may be executed in counterparts and each of such counterparts taken together shall constitute one and the same instrument.

Dated this 29th day of August, 2013.

CITADEL ADVISORS LLC			CITADEL ADVISORS HOLDINGS LP
By:	Citadel Advisors Holdings LP,		By:	Citadel GP LLC,
	its Managing Member			its General Partner
By:	Citadel GP LLC,		By:	/s/ Xxxx Xxxxxxxx
	its General Partner			Xxxx Xxxxxxxx, Authorized Signatory
By:	/s/ Xxxx Xxxxxxxx
	Xxxx Xxxxxxxx, Authorized Signatory
CITADEL GP LLC			XXXXXXX XXXXXXX
By:	/s/ Xxxx Xxxxxxxx		By:	/s/ Xxxx Xxxxxxxx
	Xxxx Xxxxxxxx, Authorized Signatory			Xxxx Xxxxxxxx, attorney-in-fact*

________________________

^* Xxxx Xxxxxxxx is signing on behalf of Xxxxxxx Xxxxxxx as attorney-in-fact pursuant to a power of attorney previously filed with the Securities and Exchange Commission on January 18, 2013, and hereby incorporated by reference herein. The power of attorney was filed as an attachment to a filing by Citadel Advisors LLC on Schedule 13G for TiVo Inc.