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Check the appropriate box to designate the rule pursuant to which this Schedule is filed:
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SCHEDULE 13D/A 0001193805-21-001424 0001640809 XXXXXXXX LIVE 15 Common Shares, without par value 12/10/2025 true 0001340476 25490H106 DIRTT ENVIRONMENTAL SOLUTIONS LTD 7303 30 ST S E CALGARY A0 T2C 1N6 ARON R. ENGLISH 206-227-3078 22NW, LP 590 1st Ave. S, Unit C1 Seattle WA 98104 RYAN NEBEL 212-451-2300 OLSHAN FROME WOLOSKY LLP 1325 Avenue of the Americas New York NY 10019 0001640809 N 22NW Fund, LP a WC OO N DE 49955045.00 0.00 49955045.00 0.00 49955045.00 N 26.0 PN 0001694297 N 22NW, LP a OO N DE 49955045.00 0.00 49955045.00 0.00 49955045.00 N 26.0 PN 0001770575 N 22NW Fund GP, LLC a OO N DE 49955045.00 0.00 49955045.00 0.00 49955045.00 N 26.0 OO 0001783663 N 22NW GP, Inc. a OO N DE 49955045.00 0.00 49955045.00 0.00 49955045.00 N 26.0 CO 0001770436 N English Aron R. a PF OO N X1 58038870.00 0.00 58038870.00 0.00 58038870.00 N 30.3 IN 0001888106 N Hirai-Hadley Bryson a PF N X1 2272.00 0.00 2272.00 0.00 2272.00 N 0.001 IN 0001888602 N Jones Alexander B b PF N X1 2181.00 0.00 2181.00 0.00 2181.00 N 0.001 IN 0002076027 N Zarate Adrian R a OO N X1 25875.00 0.00 25875.00 0.00 25875.00 N 0.01 IN Common Shares, without par value DIRTT ENVIRONMENTAL SOLUTIONS LTD 7303 30 ST S E CALGARY A0 T2C 1N6 Item 2(a) is hereby amended to add the following: On December 10, 2025, Alexander B. Jones ceased to serve as an employee of 22NW. Accordingly, as of such date, Mr. Jones is no longer a member of the Section 13(d) group and shall cease to be a Reporting Person upon the filing of this Amendment No. 15 to the Schedule 13D. The remaining Reporting Persons will continue filing statements on Schedule 13D with respect to their beneficial ownership of securities of the Issuer to the extent required by applicable law. Each of the remaining Reporting Persons is party to the Joint Filing Agreement, as further described in Item 6. Item 5(a) is hereby amended and restated to read as follows: The aggregate percentage of Shares reported owned by each person named herein is based upon 191,832,029 Shares outstanding as of October 30, 2025, which is the total number of Shares outstanding as reported in the Issuer's Quarterly Report on Form 10-Q filed with the Securities and Exchange Commission on November 6, 2025. As of the date hereof, 22NW Fund directly beneficially owned 49,955,045 Shares, constituting approximately 26.0% of the Shares outstanding. As of the date hereof, Mr. English directly beneficially owned 8,083,825 Shares, constituting approximately 4.2% of the Shares outstanding. As of the date hereof, Mr. Hirai-Hadley directly beneficially owned 2,272 Shares, constituting approximately 0.001% of the Shares outstanding. As of the date hereof, Mr. Jones directly beneficially owned 2,181 Shares, constituting approximately 0.001% of the Shares outstanding. As of the date hereof, Mr. Zarate may be deemed to beneficially own 25,875 Shares, consisting of DSUs representing the right to receive Shares upon the termination of his service as a director of the Issuer, constituting approximately 0.01% of the Shares outstanding. 22NW, as the investment manager of 22NW Fund, may be deemed to beneficially own the 49,955,045 Shares beneficially owned by 22NW Fund, constituting approximately 26.0% of the Shares outstanding. 22NW GP, as the general partner of 22NW Fund, may be deemed to beneficially own the 49,955,045 Shares beneficially owned by 22NW Fund, constituting approximately 26.0% of the Shares outstanding. 22NW Inc., as the general partner of 22NW, may be deemed to beneficially own the 49,955,045 Shares beneficially owned by 22NW Fund, constituting approximately 26.0% of the Shares outstanding. Mr. English, as the Portfolio Manager of 22NW, Manager of 22NW GP and President and sole shareholder of 22NW Inc., may be deemed to beneficially own the 49,955,045 Shares beneficially owned by 22NW Fund, which, together with the Shares he directly beneficially owns, constitutes an aggregate of 58,038,870 Shares, constituting approximately 30.3% of the Shares outstanding. The filing of this Schedule 13D shall not be deemed an admission that the Reporting Persons are, for purposes of Section 13(d) of the Securities Exchange Act of 1934, as amended, the beneficial owners of any securities of the Issuer he or it does not directly own. Each of the Reporting Persons specifically disclaims beneficial ownership of the securities reported herein that he or it does not directly own. Item 5(c) is hereby amended and restated to read as follows: There have been no transactions in the securities of the Issuer by the Reporting Persons during the past 60 days. Item 6 is hereby amended to add the following: On December 12, 2025, the Reporting Persons entered into a Joint Filing Agreement in which the Reporting Persons who will remain Reporting Persons subsequent to this Amendment No. 15 to the Schedule 13D agreed to the joint filing on behalf of each of them of statements on Schedule 13D with respect to the securities of the Issuer to the extent as required by applicable law. A copy of this agreement is attached hereto as Exhibit 99.1 and is incorporated herein by reference. Item 7 is hereby amended to add the following exhibit: 99.1 - Joint Filing Agreement, dated December 12, 2025. 22NW Fund, LP /s/ Aron R. English Aron R. English, Manager of 22NW Fund GP, LLC, its General Partner 12/12/2025 22NW, LP /s/ Aron R. English Aron R. English, President and Sole Shareholder of 22NW GP, Inc., its General Partner 12/12/2025 22NW Fund GP, LLC /s/ Aron R. English Aron R. English, Manager 12/12/2025 22NW GP, Inc. /s/ Aron R. English Aron R. English, President and Sole Shareholder 12/12/2025 English Aron R. /s/ Aron R. English ARON R. ENGLISH 12/12/2025 Hirai-Hadley Bryson /s/ Bryson O. Hirai-Hadley BRYSON O. HIRAI-HADLEY 12/12/2025 Jones Alexander B /s/ Alexander B. Jones ALEXANDER B. JONES 12/12/2025 Zarate Adrian R /s/ Adrian R. Zarate ADRIAN R. ZARATE 12/12/2025