AltaGas Ltd. — Proxy Solicitation & Information Statement 2025

Mar 25, 2025

NOTICE OF ANNUAL AND SPECIAL MEETING OF SHAREHOLDERS

Meeting Details

Thursday, May 1, 2025

1:30 p.m. (MDT)

via live webcast online at:
meetings.lumiconnect.com/400-841-462-038
password: altagas2025 (case sensitive)

Voting your Common Shares

AltaGas Ltd. ("AltaGas") shareholders of record as of the close of business on March 6, 2025 are entitled to receive notice of and vote at the annual and special meeting of shareholders ("Meeting").

Registered shareholders and duly appointed proxyholders may vote at the Meeting. Shareholders may also vote in advance of the Meeting by completing a form of proxy or voting instruction form, as applicable. Detailed voting instructions can be found beginning on page 5, under "Voting Information".

The management information circular dated March 6, 2025 ("Circular") contains information relating to the matters to be brought before the meeting, as well as other annual disclosure. Please review all information contained in the Circular before voting.

AltaGas' Board of Directors has approved the contents of the Circular and its delivery to the shareholders, directors and auditors of the company.

By order of the Board of Directors,

/s/ "Jimmi Duce"

Jimmi Duce, Corporate Secretary

Calgary, Alberta

March 6, 2025

Items of Business

At the meeting, shareholders will be asked to:

1. receive the consolidated financial statements for the year ended December 31, 2024 and the auditors' report thereon;
2. re-appoint Ernst & Young LLP, the auditor of AltaGas, and authorize the directors to set their remuneration;
3. elect each of the 10 director nominees for the ensuing year;
4. consider an amendment to AltaGas' option plan to set a fixed maximum number of common shares that may be issued on the exercise of options;
5. consider a non-binding advisory resolution to accept AltaGas' approach to executive compensation; and
6. consider such other business as may properly be brought before the meeting or any adjournment(s) thereof.

Your Vote is Important!
Please submit your vote well in advance of the proxy deposit deadline of 1:30 p.m. (MDT) on Tuesday, April 29, 2025.

AltaGas

About Notice and Access

AltaGas is using the notice and access rules adopted by the Canadian Securities Administrators in an effort to be more environmentally friendly and reduce printing and mailing costs. Instead of receiving the notice of meeting, the Circular, annual financial statements and related management's discussion and analysis (the "Meeting Materials") with the form of proxy or voting instruction form, registered and non-registered (beneficial) shareholders will receive a notice ("Notice") outlining the matters to be addressed at the meeting and instructions for accessing the Meeting Materials online and for requesting paper copies.

The Meeting Materials can be viewed online at www.altagas.ca/invest/share-information/noticeandaccess or under AltaGas' profile on SEDAR+ (www.sedarplus.ca). If you would like to receive a printed copy of the Meeting Materials, please phone 1-866-962-0498 (if you are a registered shareholder) or 1-877-907-7643 (if you are a beneficial shareholder). Refer to the Notice for additional details.