Broadridge™ 51 Mercedes Way Edgewood NY 11717 ISSUER COPY THERATECHNOLOGIES INC. 2015 Peel Street, Suite 1100 Montreal, QC H3A 1T8
Canada VOTING INSTRUCTION FORM SPECIAL MEETING Theratechnologies Inc. WHEN: Friday, September 12, 2025 at 10:00 A.M. EDT WHERE: Offices of Fasken Martineau DuMoulin LLP 800 Square Victoria, Suite 3500, Montreal, Quebec and virtually via live
audio webcast at https://meetnow.global/MDUWLVGW About Voting A meeting is being held for the holders of the securities listed on the other side of this form. As a beneficial holder of the securities you have the right to vote on the item(s) being
covered at the meeting, which are described in the Proxy Statement. The control number has been assigned to you to identify your shares for voting. You must keep your control number confidential and not disclose it to others other than when you vote
using one of the voting options set out on this form. Should you send this form or provide your control number to others, you are responsible for any subsequent voting, or subsequent inability to vote, your shares. Please read the Proxy Statement
carefully and take note of any relevant proxy deposit date. We need to receive your voting instructions at least one business day before the proxy deposit date noted on the reverse. If you have any questions, please contact the person who services
your account. We have been requested to forward to you enclosed proxy material relative to securities held by us in your account but not registered in your name. Only we as holder of record can vote such securities. We shall be pleased to vote your
securities in accordance with your wishes, if you will execute the form and return it promptly in enclosed business reply envelope. It is understood that if you sign without otherwise marking form your securities will be voted as recommended in
Proxy Statement. From this meeting, extent of our authority to vote your securities in absence of instructions can be determined by referring applicable voting instruction number indicated on face of our form. For margin accounts, event that
securities have been loaned over record date, number of securities we vote on behalf has been or can be adjusted downward. Please note that under a rule amendment adopted by the New York Stock Exchange for shareholder meetings held on or after
January 1, 2010, brokers are no longer allowed to vote securities held in their clients’ accounts on uncontested elections of directors unless the client has provided voting instructions (it will continue to be the case that brokers
cannot vote their clients’ securities in contested director elections). Consequently, if you want us to vote your securities on your behalf on the election of directors, you must provide voting instructions to us. Voting on matters presented
at shareholder meetings, particularly the election of directors is the primary method for shareholders to influence the direction taken by a publicly-traded company. We urge you to participate in the election by returning the enclosed voting
instruction form to us with instructions as to how to vote your securities in this election. If your securities are held by a broker who is a member of the New York Stock Exchange (NYSE), the rules of the NYSE will guide the voting procedures. These
rules provide that if instructions are not received from you prior to the issuance of the first vote, the proxy may be given at the discretion of your broker (on the tenth day, if the material was mailed at least 15 days prior to the meeting date or
on the fifteenth day, if the proxy material was mailed at least 25 days or more prior to the meeting date). In order for your broker to exercise this discretionary authority, proxy material would need to have been mailed at least 15 days prior to
the meeting date, and one or more of matters before meeting must be deemed “routine” in nature according to NYSE guidelines. If these two requirements are met and you have not communicated to us prior to first vote being issued, we may
vote your securities at our discretion on any matters deemed routine. We will nevertheless follow your instructions, even if our discretionary vote has already been given, provided your instructions are received prior to meeting date. The following
instructions provide specifics regarding meeting for which this voting form applies. Instruction 1: All proposals for this meeting are considered “routine”. We may vote in our discretion on all proposals, if your instructions are not
received. If your securities are held by a bank, your securities cannot be voted without your specific instructions. Instruction 2: In order for your securities to be represented at the meeting on one or more matters before the meeting, it will be
necessary for us to have your specific voting instructions. If your securities are held by a bank, your securities cannot be voted without your specific instructions. Instruction 3: In order for your securities to be represented at the meeting, it
will be necessary for us to have your specific voting instructions. Instruction 4: We have previously sent you proxy soliciting material pertaining to the meeting of shareholders of the company indicated. According to our latest records, we have not
as of yet received your voting instruction on the matter(s) to be considered at this meeting and the company has requested us to communicate with you in an endeavor to have your securities voted. If you hold your securities through a Canadian broker
or bank, please be advised that you are receiving the voting instruction form and meeting materials, at the direction of the issuer. Even if you have declined to receive securityholder materials, a reporting issuer is required to deliver these
materials to you. If you have advised your intermediary that you object to the disclosure of beneficial ownership information to the reporting issuer, it is our responsibility to deliver these materials on behalf of the reporting issuer. These
materials are being sent at no cost to you. To attend the meeting and vote your shares in person or virtually (as applicable) If you wish to attend the meeting, mark the appropriate box on the other side of this form, and a legal proxy will be
issued and mailed to you. The legal proxy will grant you or your designate the right to attend the meeting and vote in person or virtually (as applicable), subject to any rules described in the Proxy Statement applicable to the delivery of a proxy.
The legal proxy will be mailed to the name and address of the beneficial holder noted above. You need to submit and deliver the legal proxy in accordance with the proxy deposit date and any instructions or disclosures noted in the Proxy Statement.
You or your designate must attend the meeting for your vote to be counted. Allow sufficient time for mailing and return of the legal proxy by the proxy deposit date to issuer or its agent. Please be advised that if you, beneficial holder, ask for a
legal proxy to be issued, you may have to take additional steps in order for it to be fully effective under applicable law. For example, it may be necessary that you deposit the legal proxy with the issuer or its agent in advance of the meeting.
Further, if a legal proxy is issued, all other voting instructions given on this voting instruction form will not be effective. This Voting Instruction Form confers discretionary authority to vote on such other business as may properly come before
the meeting and any adjournment thereof. Disclosure of Information – Electing Receive Financial Statements Requesting Meeting Materials By electing to receive financial statements and requesting materials, your name and address may be provided
to the issuer (or its agent) for mailing purposes. 05022021 PLEASE SEE OVER S19606- 88338H704 2 2
