13G Filing: Hawk Ridge Management and Apptio Inc (APTI)

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Exhibit
A

Joint Filing
Agreement Pursuant to Rule 13d-1

This agreement is made pursuant to Rule 13d-l(k)(1) under the
Securities and Exchange Act of 1934, as amended (the “Act”) by and among the parties listed below, each referenced
to herein as a “Joint Filer.” The Joint Filers agree that a statement of beneficial ownership as required by Sections
13(g) or 13(d) of the Act and the Rules thereunder may be filed on each of their behalf on Schedule 13G or Schedule 13D, as appropriate,
and that said joint filing may thereafter be amended by further joint filings. The Joint Filers state that they each satisfy the
requirements for making a joint filing under Rule 13d-1.

Date: April 11, 2017

Hawk Ridge Capital Management
GP, LLC

 

By:
/s/ David Brown                 

David Brown, Managing Member

Hawk Ridge Capital Management,
L.P.

 

By: Hawk Ridge Capital Management
GP, LLC

Its: General Partner

By:
/s/ David Brown                 

David Brown, Managing Member

Hawk Ridge Management,
LLC

 

By:
/s/ David Brown                 

David Brown, Managing Member

Hawk Ridge Master Fund,
L.P.

 

By: Hawk Ridge Management,
LLC

Its: General Partner

By:
/s/ David Brown                 

David Brown, Managing Member

/s/ David
Brown                        

David
Brown

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