Secure Waste Infrastructure Corp. — Proxy Solicitation & Information Statement 2026

Apr 27, 2026

SECURE

SECURE WASTE INFRASTRUCTURE CORP.

ODYSSEY

Form of Proxy – Special Meeting to be held on May 27, 2026

Trader's Bank Building
1100, 67 Yonge Street
Toronto ON M5E 1J8

Appointment of Proxyholder

I/We being the undersigned holder(s) of Secure Waste Infrastructure Corp. (the "Corporation") hereby appoint: Michael (Mick) Dilger, Chairman of the Board, or failing him, Allen Gransch, President and Chief Executive Officer of the Corporation (the "Management Nominees")

or

Print the name of the person you are appointing if this person is someone other than the Management Nominees listed herein:

as my/our proxyholder with full power of substitution and to attend, act, and to vote for and on behalf of the holder in accordance with the following direction (or if no directions have been given, as the proxyholder sees fit) and all other matters that may properly come before the Special Meeting of the Corporation (the "Meeting") to be held in a hybrid format, which will be conducted in person at Brookfield Place, 225 – 6th Avenue S.W., Suite 1410, Calgary, Alberta, and through a live audio webcast accessible at meetings.lumiconnect.com/400-991-827-641. The password for the live audio webcast is "secure2026", (case-sensitive) on Wednesday, May 27, 2026 at 10:00 am (Calgary time) or at any adjournment or postponement thereof.

1. Arrangement Resolution: To consider, and, if deemed advisable, to pass, with or without variation, a special resolution to approve an arrangement (the "Arrangement") under Section 193 of the Business Corporations Act (Alberta) (the "ABCA") involving, among others, Secure Waste Infrastructure Corp. (the "Corporation") GFL Environmental Inc. and the Shareholders of the Corporation, as more particularly described and set forth in the management information circular of the Corporation (the "Circular") dated April 24, 2026

For
☐
Against

Authorized Signature(s) – This section must be completed for your instructions to be executed.

I/we authorize you to act in accordance with my/our instructions set out above. I/We hereby revoke any proxy previously given with respect to the Meeting. If no voting instructions are indicated above, this Proxy will be voted as recommended by Management of the Corporation.

Signature(s):

Date

MM / DD / YY

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INSTEAD OF MAILING THIS PROXY, YOU MAY SUBMIT YOUR
PROXY USING SECURE ONLINE VOTING AVAILABLE ANYTIME:

This form of proxy is solicited by and on behalf of Management.
Proxies must be received by 10:00 a.m. (Calgary time), on May 25, 2026.

Notes to Proxy

1. Each holder has the right to appoint a person, who need not be a holder, to attend and represent them at the Meeting. If you wish to appoint a person other than the persons whose names are printed herein, please insert the name of your chosen proxyholder in the space provided on the reverse.
2. If the securities are registered in the name of more than one holder (for example, joint ownership, trustees, executors, etc.) then all of the registered owners must sign this proxy in the space provided on the reverse. If you are voting on behalf of a corporation or another individual, you may be required to provide documentation evidencing your power to sign this proxy with signing capacity stated.
3. This proxy should be signed in the exact manner as the name appears on the proxy.
4. If this proxy is not dated, it will be deemed to bear the date on which it is mailed by Management to the holder.
5. The securities represented by this proxy will be voted as directed by the holder; however, if such a direction is not made in respect of any matter, this proxy will be voted as recommended by Management of the Corporation.
6. The securities represented by this proxy will be voted or withheld from voting, in accordance with the instructions of the holder, on any ballot that may be called for and, if the holder has specified a choice with respect to any matter to be acted on, the securities will be voted accordingly.
7. This proxy confers discretionary authority in respect of amendments to matters identified in the Notice of Meeting or other matters that may properly come before the meeting.
8. This proxy should be read in conjunction with the accompanying documentation provided by Management.

To Vote Your Proxy Online please visit:
https://vote.odysseytrust.com

You will require the CONTROL NUMBER printed with your address to the right.

If you vote by Internet, do not mail this proxy.

You can attend the Meeting virtually by visiting
meetings.lumiconnect.com/ and entering the Meeting ID 400-991-827-641. Password for registered shareholders and duly appointed proxyholders is "secure2026" (case sensitive).

Voting by mail may be the only method for securities held in the name of a corporation or securities being voted on behalf of another individual. A return envelope has been enclosed for voting by mail.