SCHEDULE 13D/A 0001407029 XXXXXXXX LIVE 13 Common Stock 02/27/2026 false 0001397187 550021109 lululemon athletica inc.

1818 Cornwall Avenue Vancouver A1 V6J 1C7

Dennis J. Wilson 604-737-7232 21 Water Street, Suite 600 Vancouver, British Columbia Z4 V6B 1A1 0001407029 N Dennis J. Wilson a OO N Z4 3852.00 9901004.00 3852.00 9901004.00 9904856.00 N 8.4 IN Y Anamered Investments Inc. a OO N D8 0.00 4755217.00 0.00 4755217.00 4755217.00 N 4.1 CO 0002003936 N LIPO Investments (USA), Inc. a OO N A1 0.00 3401596.00 0.00 3401596.00 3401596.00 N 2.9 CO Y Wilson 5 Foundation a OO N A1 0.00 829325.00 0.00 829325.00 829325.00 N 0.7 OO Y Wilson 5 Foundation Management Ltd. a OO N A1 0.00 829325.00 0.00 829325.00 829325.00 N 0.7 CO Y Five Boys Investments ULC a OO N A1 0.00 91760.00 0.00 91760.00 91760.00 N 0.1 OO Y Shannon Wilson a OO N Z4 0.00 1098309.00 0.00 1098309.00 1098309.00 N 0.9 IN 0001972360 N Low Tide Properties Ltd. a OO N A1 0.00 554122.00 0.00 554122.00 554122.00 N 0.5 CO Y House of Wilson Ltd. a N Z4 0.00 0.00 0.00 0.00 0.00 Y 0.0 CO Y Laura Gentile a N X1 0.00 0.00 0.00 0.00 0.00 Y 0.0 IN Y Eric Hirshberg a N X1 0.00 0.00 0.00 0.00 0.00 Y 0.0 IN Y Marc Maurer a N V8 0.00 0.00 0.00 0.00 0.00 Y 0.0 IN Common Stock lululemon athletica inc. 1818 Cornwall Avenue Vancouver A1 V6J 1C7 This Amendment No. 13 (this "Amendment") is being filed by Dennis J. Wilson, Anamered Investments Inc. ("Anamered"), LIPO Investments (USA), Inc. ("LIPO"), Wilson 5 Foundation ("Wilson 5"), Wilson 5 Foundation Management Ltd. ("Wilson 5 Trustee"), Five Boys Investments ULC ("Five Boys"), Shannon Wilson, Low Tide Properties Ltd. ("Low Tide"), House of Wilson Ltd. ("House of Wilson"), Laura Gentile, Eric Hirshberg and Marc Maurer (collectively, the "Reporting Persons") and amends and supplements the Schedule 13D filed with the U.S. Securities and Exchange Commission (the "SEC") by the Reporting Persons on February 14, 2019 (as amended, the "Schedule 13D") to reflect certain updates to the information previously reported. The number of shares of Issuer common stock beneficially owned by the Reporting Persons has not changed since the filing of Amendment No. 12 to the Schedule 13D filed by the reporting persons thereto on December 30, 2025. The Items below amend the information disclosed under the corresponding Items in the Schedule 13D as described below. Capitalized terms used but not defined in this Amendment shall have the same meanings ascribed to them in the Schedule 13D. Except as specifically provided herein, this Amendment does not modify any of the information previously reported in the Schedule 13D. Item 4 is hereby amended and supplemented as follows: On February 27, 2026, Mr. Wilson issued an open letter to shareholders of the Issuer (the "February Open Letter"), a copy of which is attached as Exhibit 99.1 to this Amendment, setting forth his views that the Issuer's long overdue response to his constructive framework did not reflect serious engagement toward arriving at a resolution that puts the Issuer in the best position to unlock value for the benefit of all shareholders, and expressing concerns about the Board's independence, which he believes underscores the need for meaningful Board refreshment endorsed by the Issuer's shareholders to effectuate substantial change. The information contained in Exhibit 99.1 of this Amendment is incorporated herein by reference. Following the issuance of the February Open Letter, also on February 27, 2026, the Issuer released a responsive public statement, which the Reporting Persons believe both misstates the factual background of the interactions between the Issuer and Mr. Wilson and demonstrates the startling depth of the Board's entrenchment mindset. The Reporting Persons believe that if the Board actually desired to reach a constructive resolution with Mr. Wilson, instead of issuing a reactive and defensive statement, the Board would have taken more time to reflect on the factual and reasonable criticism in the February Open Letter and come to the conclusion that the urgent and immediate change advocated by Mr. Wilson is in the best interests of the Issuer and all of its shareholders. Item 6 is hereby amended and supplemented as follows: On January 28, 2026, Mr. Wilson submitted a books and records demand to the Issuer that is customary to make in proxy contests under Section 220 of the Delaware General Corporation Law. Mr. Wilson has entered into an administerial and traditional agreement in connection with such demand. Item 7 of the Schedule 13D is hereby amended and supplemented as follows: Exhibit 99.1 Press Release Titled "Chip Wilson Provides Update to lululemon Shareholders" Dennis J. Wilson /s/ Dennis J. Wilson 02/27/2026 Anamered Investments Inc. /s/ Dennis J. Wilson 02/27/2026 LIPO Investments (USA), Inc. /s/ Dennis J. Wilson 02/27/2026 Wilson 5 Foundation /s/ Dennis J. Wilson 02/27/2026 Wilson 5 Foundation Management Ltd. /s/ Dennis J. Wilson 02/27/2026 Five Boys Investments ULC /s/ Dennis J. Wilson 02/27/2026 Shannon Wilson /s/ Shannon Wilson 02/27/2026 Low Tide Properties Ltd. /s/ Dennis J. Wilson 02/27/2026 House of Wilson Ltd. /s/ Dennis J. Wilson 02/27/2026 Laura Gentile /s/ Laura Gentile 02/27/2026 Eric Hirshberg /s/ Eric Hirshberg 02/27/2026 Marc Maurer /s/ Marc Maurer 02/27/2026