AltaGas Ltd. — Proxy Solicitation & Information Statement 2025

Feb 6, 2025

February 06, 2025

Computershare

324-8th Avenue SW, 8th floor

Calgary AB, T2P 2Z2

www.computershare.com

To: All Canadian Securities Regulatory Authorities

Subject: ALTAGAS LTD.

Dear Sir/Madam:

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

Meeting Type : Annual and Special Meeting
Record Date for Notice of Meeting : March 06, 2025
Record Date for Voting (if applicable) : March 06, 2025
Beneficial Ownership Determination Date : March 06, 2025
Meeting Date : May 01, 2025
Meeting Location (if available) : Virtual Meeting
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 : 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	021361100	CA0213611001

Sincerely,

Computershare

Agent for ALTAGAS LTD.