DIRTT Environmental (DRTTF): 22NW and Aron R. English disclose 30.3% ownership

Rhea-AI Filing Summary

DIRTT Environmental Solutions received an updated ownership report from 22NW and related parties. The filing states that as of a base of 191,832,029 common shares outstanding as of October 30, 2025, 22NW Fund beneficially owned 49,955,045 shares, or about 26.0% of the company. Through direct and indirect holdings, Aron R. English is reported as beneficially owning 58,038,870 shares, representing approximately 30.3% of the shares outstanding.

The amendment also notes that on December 10, 2025, Alexander B. Jones ceased to be an employee of 22NW and, as a result, is no longer part of the Section 13(d) group, though he continues to directly own 2,181 shares. The reporting persons state there have been no transactions in DIRTT shares by them during the past 60 days. On December 12, 2025 they entered into a Joint Filing Agreement to continue coordinated reporting of their DIRTT holdings as required.

SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

SCHEDULE 13D

Under the Securities Exchange Act of 1934

(Amendment No. 15)

DIRTT ENVIRONMENTAL SOLUTIONS LTD

(Name of Issuer)

Common Shares, without par value

(Title of Class of Securities)

25490H106

(CUSIP Number)

ARON R. ENGLISH
22NW, LP, 590 1st Ave. S, Unit C1
Seattle, WA, 98104
206-227-3078

RYAN NEBEL
OLSHAN FROME WOLOSKY LLP, 1325 Avenue of the Americas
New York, NY, 10019
212-451-2300

(Name, Address and Telephone Number of Person Authorized to Receive Notices and Communications)

12/10/2025

(Date of Event Which Requires Filing of This Statement)

If the filing person has previously filed a statement on Schedule 13G to report the acquisition that is the subject of this Schedule 13D, and is filing this schedule because of §§ 240.13d-1(e), 240.13d-1(f) or 240.13d-1(g), check the following box.

The information required on the remainder of this cover page shall not be deemed to be "filed" for the purpose of Section 18 of the Securities Exchange Act of 1934 ("Act") or otherwise subject to the liabilities of that section of the Act but shall be subject to all other provisions of the Act (however, see the Notes).

SCHEDULE 13D

CUSIP No. 25490H106

1

Name of reporting person

22NW Fund, LP

2

Check the appropriate box if a member of a Group (See Instructions)

(a)
(b)

3

SEC use only

4

Source of funds (See Instructions)

WC, OO

5

Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)

6

Citizenship or place of organization

DELAWARE

Number of Shares Beneficially Owned by Each Reporting Person With:

7	Sole Voting Power 49,955,045.00
8	Shared Voting Power 0.00
9	Sole Dispositive Power 49,955,045.00
10	Shared Dispositive Power 0.00

11

Aggregate amount beneficially owned by each reporting person

49,955,045.00

12

Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)

13

Percent of class represented by amount in Row (11)

26.0 %

14

Type of Reporting Person (See Instructions)

PN

SCHEDULE 13D

CUSIP No. 25490H106

1

Name of reporting person

22NW, LP

2

Check the appropriate box if a member of a Group (See Instructions)

(a)
(b)

3

SEC use only

4

Source of funds (See Instructions)

OO

5

Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)

6

Citizenship or place of organization

DELAWARE

Number of Shares Beneficially Owned by Each Reporting Person With:

7	Sole Voting Power 49,955,045.00
8	Shared Voting Power 0.00
9	Sole Dispositive Power 49,955,045.00
10	Shared Dispositive Power 0.00

11

Aggregate amount beneficially owned by each reporting person

49,955,045.00

12

Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)

13

Percent of class represented by amount in Row (11)

26.0 %

14

Type of Reporting Person (See Instructions)

PN

SCHEDULE 13D

CUSIP No. 25490H106

1

Name of reporting person

22NW Fund GP, LLC

2

Check the appropriate box if a member of a Group (See Instructions)

(a)
(b)

3

SEC use only

4

Source of funds (See Instructions)

OO

5

Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)

6

Citizenship or place of organization

DELAWARE

Number of Shares Beneficially Owned by Each Reporting Person With:

7	Sole Voting Power 49,955,045.00
8	Shared Voting Power 0.00
9	Sole Dispositive Power 49,955,045.00
10	Shared Dispositive Power 0.00

11

Aggregate amount beneficially owned by each reporting person

49,955,045.00

12

Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)

13

Percent of class represented by amount in Row (11)

26.0 %

14

Type of Reporting Person (See Instructions)

OO

SCHEDULE 13D

CUSIP No. 25490H106

1

Name of reporting person

22NW GP, Inc.

2

Check the appropriate box if a member of a Group (See Instructions)

(a)
(b)

3

SEC use only

4

Source of funds (See Instructions)

OO

5

Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)

6

Citizenship or place of organization

DELAWARE

Number of Shares Beneficially Owned by Each Reporting Person With:

7	Sole Voting Power 49,955,045.00
8	Shared Voting Power 0.00
9	Sole Dispositive Power 49,955,045.00
10	Shared Dispositive Power 0.00

11

Aggregate amount beneficially owned by each reporting person

49,955,045.00

12

Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)

13

Percent of class represented by amount in Row (11)

26.0 %

14

Type of Reporting Person (See Instructions)

CO

SCHEDULE 13D

CUSIP No. 25490H106

1

Name of reporting person

English Aron R.

2

Check the appropriate box if a member of a Group (See Instructions)

(a)
(b)

3

SEC use only

4

Source of funds (See Instructions)

PF, OO

5

Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)

6

Citizenship or place of organization

UNITED STATES

Number of Shares Beneficially Owned by Each Reporting Person With:

7	Sole Voting Power 58,038,870.00
8	Shared Voting Power 0.00
9	Sole Dispositive Power 58,038,870.00
10	Shared Dispositive Power 0.00

11

Aggregate amount beneficially owned by each reporting person

58,038,870.00

12

Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)

13

Percent of class represented by amount in Row (11)

30.3 %

14

Type of Reporting Person (See Instructions)

IN

SCHEDULE 13D

CUSIP No. 25490H106

1

Name of reporting person

Hirai-Hadley Bryson

2

Check the appropriate box if a member of a Group (See Instructions)

(a)
(b)

3

SEC use only

4

Source of funds (See Instructions)

PF

5

Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)

6

Citizenship or place of organization

UNITED STATES

Number of Shares Beneficially Owned by Each Reporting Person With:

7	Sole Voting Power 2,272.00
8	Shared Voting Power 0.00
9	Sole Dispositive Power 2,272.00
10	Shared Dispositive Power 0.00

11

Aggregate amount beneficially owned by each reporting person

2,272.00

12

Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)

13

Percent of class represented by amount in Row (11)

0.001 %

14

Type of Reporting Person (See Instructions)

IN

SCHEDULE 13D

CUSIP No. 25490H106

1

Name of reporting person

Jones Alexander B

2

Check the appropriate box if a member of a Group (See Instructions)

(a)
(b)

3

SEC use only

4

Source of funds (See Instructions)

PF

5

Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)

6

Citizenship or place of organization

UNITED STATES

Number of Shares Beneficially Owned by Each Reporting Person With:

7	Sole Voting Power 2,181.00
8	Shared Voting Power 0.00
9	Sole Dispositive Power 2,181.00
10	Shared Dispositive Power 0.00

11

Aggregate amount beneficially owned by each reporting person

2,181.00

12

Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)

13

Percent of class represented by amount in Row (11)

0.001 %

14

Type of Reporting Person (See Instructions)

IN

SCHEDULE 13D

CUSIP No. 25490H106

1

Name of reporting person

Zarate Adrian R

2

Check the appropriate box if a member of a Group (See Instructions)

(a)
(b)

3

SEC use only

4

Source of funds (See Instructions)

OO

5

Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)

6

Citizenship or place of organization

UNITED STATES

Number of Shares Beneficially Owned by Each Reporting Person With:

7	Sole Voting Power 25,875.00
8	Shared Voting Power 0.00
9	Sole Dispositive Power 25,875.00
10	Shared Dispositive Power 0.00

11

Aggregate amount beneficially owned by each reporting person

25,875.00

12

Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)

13

Percent of class represented by amount in Row (11)

0.01 %

14

Type of Reporting Person (See Instructions)

IN

SCHEDULE 13D

Item 1.	Security and Issuer
(a)	Title of Class of Securities: Common Shares, without par value
(b)	Name of Issuer: DIRTT ENVIRONMENTAL SOLUTIONS LTD
(c)	Address of Issuer's Principal Executive Offices: 7303 30 ST S E, CALGARY, ALBERTA, CANADA , T2C 1N6.
Item 2.	Identity and Background
(a)	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.	Interest in Securities of the Issuer
(a)	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.
(c)	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.	Contracts, Arrangements, Understandings or Relationships With Respect to Securities of the Issuer
	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.	Material to be Filed as Exhibits.
	Item 7 is hereby amended to add the following exhibit: 99.1 - Joint Filing Agreement, dated December 12, 2025.

SIGNATURE

After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct.

22NW Fund, LP

Signature:	/s/ Aron R. English
Name/Title:	Aron R. English, Manager of 22NW Fund GP, LLC, its General Partner
Date:	12/12/2025

22NW, LP

Signature:	/s/ Aron R. English
Name/Title:	Aron R. English, President and Sole Shareholder of 22NW GP, Inc., its General Partner
Date:	12/12/2025

22NW Fund GP, LLC

Signature:	/s/ Aron R. English
Name/Title:	Aron R. English, Manager
Date:	12/12/2025

22NW GP, Inc.

Signature:	/s/ Aron R. English
Name/Title:	Aron R. English, President and Sole Shareholder
Date:	12/12/2025

English Aron R.

Signature:	/s/ Aron R. English
Name/Title:	ARON R. ENGLISH
Date:	12/12/2025

Hirai-Hadley Bryson

Signature:	/s/ Bryson O. Hirai-Hadley
Name/Title:	BRYSON O. HIRAI-HADLEY
Date:	12/12/2025

Jones Alexander B

Signature:	/s/ Alexander B. Jones
Name/Title:	ALEXANDER B. JONES
Date:	12/12/2025

Zarate Adrian R

Signature:	/s/ Adrian R. Zarate
Name/Title:	ADRIAN R. ZARATE
Date:	12/12/2025

FAQ

What ownership stake in DIRTT Environmental Solutions does 22NW report in this filing?

The filing states that 22NW Fund directly beneficially owns 49,955,045 common shares of DIRTT Environmental Solutions, representing approximately 26.0% of the 191,832,029 shares outstanding as of October 30, 2025.

How many DIRTT Environmental Solutions shares does Aron R. English report beneficially owning?

As of the report, Aron R. English is deemed to beneficially own an aggregate of 58,038,870 DIRTT shares, equal to about 30.3% of the shares outstanding, combining his direct holdings and shares attributed through 22NW entities.

What change involving Alexander B. Jones is disclosed for DIRTTF in this Schedule 13D/A?

The document notes that on December 10, 2025, Alexander B. Jones ceased to be an employee of 22NW and is no longer a member of the Section 13(d) group, though he still directly owns 2,181 DIRTT shares.

Did the reporting persons trade DIRTT Environmental Solutions (DRTTF) shares recently?

The filing states that there have been no transactions in DIRTT Environmental Solutions securities by the reporting persons during the past 60 days.

What is the total share count used to calculate the ownership percentages in this DIRTTF filing?

Ownership percentages are based on 191,832,029 DIRTT common shares outstanding as of October 30, 2025, as reported in the company’s Form 10-Q filed on November 6, 2025.

What is the Joint Filing Agreement mentioned for DIRTT Environmental Solutions (DRTTF)?

On December 12, 2025, the reporting persons entered into a Joint Filing Agreement under which those remaining as reporting persons agreed to file Schedule 13D statements jointly for their DIRTT holdings, as required by applicable law.

Which other individuals besides Aron R. English are listed as DIRTTF reporting persons and what are their stakes?

The filing lists Bryson O. Hirai-Hadley with 2,272 shares (about 0.001%), Alexander B. Jones with 2,181 shares (about 0.001%), and Adrian R. Zarate with 25,875 DSU-linked shares (about 0.01%) of DIRTT.