Cipher Pharmaceuticals Inc. — Proxy Solicitation & Information Statement 2026

Apr 16, 2026

April 16, 2026

Computershare

320 Bay Street, 14th Floor

Toronto ON M5H 4A6

www.computershare.com

To: All Canadian Securities Regulatory Authorities

Subject: CIPHER PHARMACEUTICALS 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
Record Date for Notice of Meeting : May 11, 2026
Record Date for Voting (if applicable) : May 11, 2026
Beneficial Ownership Determination Date : May 11, 2026
Meeting Date : June 18, 2026
Meeting Location (if available) : Toronto ON
Issuer sending proxy related materials directly to NOBO: No
Issuer paying for delivery to OBO: Yes

Notice and Access (NAA) Requirements:

NAA for Beneficial Holders No
NAA for Registered Holders No

Voting Security Details:

Description	CUSIP Number	ISIN
COMMON SHARES	17253X105	CA17253X1050

Sincerely,

Computershare

Agent for CIPHER PHARMACEUTICALS INC.