Exhibit A

Joint Filing Agreement

The undersigned hereby agree that the statement on Schedule 13G with respect to the Class A Common Stock, par value $0.0001 per share of Zulily, Inc., dated as of February 17, 2015, is, and any amendments thereto (including amendments on Schedule 13D) signed by each of the undersigned shall be, filed on behalf of each of us pursuant to and in accordance with the provisions of Rule 13d-1(k) under the Securities Exchange Act of 1934.

Date: February 17, 2015

MAVERICK CAPITAL, LTD.

By:	Maverick Capital Management, LLC
	Its General Partner

	By:	Lee S. Ainslie III, Manager


		By:	/s/ John T. McCafferty
			John T. McCafferty Under Power of Attorney dated February 13, 2003

MAVERICK CAPITAL MANAGEMENT, LLC

By:	Lee S. Ainslie III, Manager


	By:	/s/ John T. McCafferty
		John T. McCafferty Under Power of Attorney dated February 13, 2003

	LEE S. AINSLIE III


	By:	/s/ John T. McCafferty
		John T. McCafferty Under Power of Attorney dated February 13, 2003

	ANDREW H. WARFORD


	By:	/s/ John T. McCafferty
		John T. McCafferty Under Power of Attorney dated February 11, 2015

zulily, inc. SC 13G/A