Exhibit 99.4

JOINT FILING AGREEMENT PURSUANT TO RULE 13d-1(k)(1)

In accordance with Rule 13d-1(k) under the Securities Exchange Act of 1934, as amended, the persons named below agree to the joint filing on behalf of each of them of the Schedule 13D to which this Agreement is an exhibit (and any further amendment filed by them) with respect to the shares of Common Stock of lululemon athletica inc. This agreement may be executed simultaneously in any number of counterparts, all of which together shall constitute one and the same instrument.

Advent International GPE VII-A Limited Partnership

Advent International GPE VII-E Limited Partnership

Advent International GPE VII-H Limited Partnership

By: GPE VII GP Limited Partnership, General Partner

By: Advent International GPE VII, LLC, General Partner

By: Advent International Corporation, Manager

By: Jarlyth H. Gibson, Risk Officer*

Advent International GPE VII Limited Partnership

Advent International GPE VII-B Limited Partnership

Advent International GPE VII-C Limited Partnership

Advent International GPE VII-D Limited Partnership

Advent International GPE VII-F Limited Partnership

Advent International GPE VII-G Limited Partnership

By: GPE VII GP (Delaware) Limited Partnership, General Partner

By: Advent International GPE VII, LLC, General Partner

By: Advent International Corporation, Manager

By: Jarlyth H. Gibson, Risk Officer*

Advent Partners GPE VII Limited Partnership

Advent Partners GPE VII Cayman Limited Partnership

Advent Partners GPE VII – A Limited Partnership

Advent Partners GPE VII – A Cayman Limited Partnership

Advent Partners GPE VII – B Cayman Limited Partnership

Advent Partners GPE VII 2014 Limited Partnership

Advent Partners GPE VII 2014 Cayman Limited Partnership

Advent Partners GPE VII – A 2014 Limited Partnership

Advent Partners GPE VII – A 2014 Cayman Limited Partnership

By: Advent International GPE VII, LLC, General Partner

By: Advent International Corporation, Manager

By: Jarlyth H. Gibson, Risk Officer*

GPE VII GP Limited Partnership

GPE VII GP (Delaware) Limited Partnership

By: Advent International GPE VII, LLC, General Partner

By: Advent International Corporation, Manager

By: Jarlyth H. Gibson, Risk Officer*

Advent International GPE VII, LLC

By: Advent International Corporation, Manager

By: Jarlyth H. Gibson, Risk Officer*

Advent International Corporation

By: Jarlyth H. Gibson, Risk Officer*

*For all of the above:

By: /s/ Jarlyth H. Gibson

Jarlyth H. Gibson, Risk Officer

Advent Puma Acquisition Limited

By: /s/ Michael Ristaino

Michael Ristaino, Director