Form: SCHEDULE 13G/A

Statement of Beneficial Ownership by Certain Investors

August 6, 2026






Check the appropriate box to designate the rule pursuant to which this Schedule is filed:
Checkbox checked   Rule 13d-1(b)
Checkbox not checked   Rule 13d-1(c)
Checkbox not checked   Rule 13d-1(d)




schemaVersion:


SCHEDULE 13G



1Names of Reporting Persons

Mawer Investment Management Ltd.
2Check the appropriate box if a member of a Group (see instructions)

Checkbox not checked  (a)
Checkbox not checked  (b)
3Sec Use Only
4Citizenship or Place of Organization

ALBERTA, CANADA
Number of Shares Beneficially Owned by Each Reporting Person With:
9Aggregate Amount Beneficially Owned by Each Reporting Person

1,230,575.00
10Check box if the aggregate amount in row (9) excludes certain shares (See Instructions)

Checkbox not checked
11Percent of class represented by amount in row (9)

5.01 %
12Type of Reporting Person (See Instructions)

IA

Comment for Type of Reporting Person:  Based upon 24,559,649 Common Stock of Barrett Business Services, Inc. (the "Issuer") outstanding as of April 22, 2026, as reported in the Issuer's 10-Q filed with the Securities and Exchange Commission on May 7, 2026.


SCHEDULE 13G



 
Mawer Investment Management Ltd.
 
Signature:/s/ John Wilson
Name/Title:Portfolio Manager
Date:08/05/2026