Quarterhill Inc. — Proxy Solicitation & Information Statement 2026

Mar 31, 2026

Date: March 31, 2026

Computershare

320 Bay Street, 14th Floor

Toronto ON M5H 4A6

www.computershare.com

To: All Canadian Securities Regulatory Authorities

AMENDED

Subject: QUARTERHILL INC.

Dear Sir/Madam:

We advise of the following with respect to the upcoming Meeting of Security Holders for the subject Issuer:

Meeting Type :	Annual General and Special Meeting - Amended
Record Date for Notice of Meeting :	April 16, 2026
Record Date for Voting (if applicable) :	April 16, 2026
Beneficial Ownership Determination Date :	April 16, 2026
Meeting Date :	May 26, 2026
Meeting Location (if available) :	Virtual Meeting
Issuer sending proxy related materials directly to NOBO:	Yes
Issuer paying for delivery to OBO:	Yes

Notice and Access (NAA) Requirements:

• NAA for Beneficial Holders: Yes
• Beneficial Holders Stratification Criteria: Not Applicable
• NAA for Registered Holders: Yes
• Registered Holders Stratification Criteria: Not Applicable

Voting Security Details:

Description	CUSIP Number	ISIN
COMMON SHARES	747713105	CA7477131055

Sincerely,

Computershare

Agent for QUARTERHILL INC.