SCHEDULE 13D/A

DIRTT ENVIRONMENTAL SOLUTIONS LTD COM

Common Shares, without par value · CUSIP: 25490H106

Event date: 2025-10-07

Reporting persons may disclose overlapping interests. Their amounts are shown individually and are not added into a filing total.

Filing-level shares

Unavailable

Percent of class

Unavailable

• 22NW Fund, LPReported CIK 0001640809

  Shares: 49,955,045.00 · Class: 26.2%

• 22NW, LPReported CIK 0001694297

  Shares: 49,955,045.00 · Class: 26.2%

• 22NW Fund GP, LLCReported CIK 0001770575

  Shares: 49,955,045.00 · Class: 26.2%

• 22NW GP, Inc.Reported CIK 0001783663

  Shares: 49,955,045.00 · Class: 26.2%

• English Aron R.Reported CIK 0001770436

  Shares: 58,038,870.00 · Class: 30.5%

• Hirai-Hadley BrysonReported CIK 0001888106

  Shares: 2,272.00 · Class: 0.001%

• Jones Alexander BReported CIK 0001888602

  Shares: 2,181.00 · Class: 0.001%

• Zarate Adrian RReported CIK 0002076027

  Shares: 25,875.00 · Class: 0.01%

Amounts are as disclosed in this filing. Schedule type alone does not establish investment intent.