Tenaris : AGMS/EGMS Proxy Form

AGMS PROXY FORM

VOTING INSTRUCTIONS

FOR THE ANNUAL GENERAL MEETING OF SHAREHOLDERS OF TENARIS S.A.

TO BE HELD ON 30TH APRIL 2024,

AT 15:00 (CENTRAL EUROPEAN TIME)1

As holder of the number of shares (the "Shares") of Tenaris S.A. (the "Company") indicated below, I hereby grant a power-of-attorney in favor of2:

□ Option 13: ____________________________________________________________________

□O ption 2: Francesco Giuseppe Bettiol, Marco Maria Domenico Tajana, Stefano Bassi, Javier Cayzac and Marcos Basaldella, any of them acting individually; and in their absence from the Annual General Meeting of Shareholders, the chairman of the Annual General Meeting of Shareholders

to vote on my behalf all the Shares at the Annual General Meeting of Shareholders to be held on 30th April 2024, at 15:00 (Central European Time), in accordance with the following instructions:

Voting for the Annual General Meeting of Shareholders (Please check the appropriate box with a cross or check-mark)

AGENDA FOR THE ANNUAL GENERAL MEETING OF SHAREHOLDERS	FOR	AGAINST	ABSTAIN
1. Consideration of (i) the Company's 2023 annual report containing the consolidated management report and related management certifications on the Company's consolidated financial statements as of and for the year ended 31st December 2023, and on the annual accounts as at 31st December 2023, and the external auditors' reports on such consolidated financial statements and annual accounts, and; (ii) the Company's 2023 annual sustainability report containing the non-financial statement

1 A shareholder who elects to have a proxy holder attend the Annual General Meeting of Shareholders in person and vote by proxy, must submit (in addition to the Intention to Participate Form) the AGMS Proxy Form as soon as possible and, in any event, must be received by the Company on or before 23rd April 2024 at 24:00 (midnight), Central European Time. A shareholder who does not wish to attend the Annual General Meeting of Shareholders but nonetheless wishes to vote by proxy at the Annual General Meeting of Shareholders must only complete and return to the Company the AGMS Proxy Form (and do not need to submit the Intention to Participate Form nor a Power of Attorney) in which case the AGMS Proxy Form must be received by the Company on or before 16th April 2024 at 24:00 (midnight), Central European Time.

2 Please select either option 1 or option 2, by checking the appropriate box with a cross or check-mark and indicating, in the case you select option 1, the natural person or legal entity appointed to represent you at the Annual General Meeting of Shareholders. If you select both options, option 2 will only be applicable if you do not indicate the name of the natural person or legal entity appointed to represent you at the Annual General Meeting of Shareholders, or if such natural person or legal entity is not present or represented at the Annual General Meeting of Shareholders.

3 Please indicate the name of the natural person or entity appointed to represent you at the Annual General Meeting of Shareholders. You may appoint only one proxy holder to represent you at the Annual General Meeting of Shareholders, except that: (i) if you hold your Shares through more than one securities account, you may appoint one proxy holder for each securities account; (ii) if you are acting professionally for the account of a natural person or legal entity you may appoint such natural person or legal entity, or any other third party designated by them, as proxy holder.

AGENDA FOR THE ANNUAL GENERAL MEETING OF SHAREHOLDERS	FOR	AGAINST	ABSTAIN
2. Approval of the Company's consolidated financial statements as of and for the year ended 31st December 2023.
3. Approval of the Company's annual accounts as at 31st December 2023.
4. Allocation of results and approval of dividend payment for the year ended 31st December 2023.
5. Discharge of the members of the Board of Directors for the exercise of their mandate throughout the year ended 31st December 2023.
6. Election of members of the Board of Directors.
7. Approval of the compensation payable to the members of the Board of Directors for the year ending 31st December 2024.
8. Approval of the Company's compensation report for the year ended 31st December 2023.
9. Approval of the Company's compensation policy applicable to the members of the Board of Directors and the Chief Executive Officer.
10. Approval of the external auditor's fees for the fiscal year ending 31st December 2024.
11. Authorization to the Board of Directors to cause the distribution of all shareholder communications, including its shareholder meeting and proxy materials and annual reports to shareholders, by such electronic means as is permitted by any applicable laws or regulations.

Please note, for purposes of assessing any potential conflicts of interest, that Francesco Giuseppe Bettiol, Marco Maria Domenico Tajana, Stefano Bassi, Javier Cayzac and Marcos Basaldella are employees of a subsidiary of the Company and that the chairperson of the Annual General Meeting of Shareholders may potentially be an employee, a member of the board, a shareholder, an advisor or a service provider of the Company or of a subsidiary of the Company.

DATE:	_____________________________________________________
SHAREHOLDER'S NAME:	_____________________________________________________
SHAREHOLDER'S ADDRESS:	_____________________________________________________
NUMBER OF SHARES OF THE
COMPANY HELD ON 16TH APRIL
2024 AT 24:00 (MIDNIGHT),
CENTRAL EUROPEAN TIME:	________________________________________________________________
SIGNATURE:	_____________________________________________________
TITLE4:	_____________________________________________________

EGMS PROXY FORM

VOTING INSTRUCTIONS

FOR THE EXTRAORDINARY GENERAL MEETING OF SHAREHOLDERS OF TENARIS S.A.

TO BE HELD ON 30TH APRIL 2024,

IMMEDIATELY AFTER THE ADJOURNMENT OF THE ANNUAL GENERAL MEETING OF SHAREHOLDERS5

As holder of the number of shares (the "Shares") of Tenaris S.A. (the "Company") indicated below, I hereby grant a power-of-attorney in favor of6:

□ Option 17: ____________________________________________________________________

□ Option 2: Francesco Giuseppe Bettiol, Marco Maria Domenico Tajana, Stefano Bassi, Javier Cayzac and Marcos Basaldella, any of them acting individually; and in their absence from the Extraordinary General Meeting of Shareholders, the chairman of the Extraordinary General Meeting of Shareholders to vote on my behalf all the Shares at the Extraordinary General Meeting of Shareholders to be held on 30th April 2024, immediately after the adjournment of the Annual General Meeting of Shareholders, in accordance with the following instructions:

Voting for the Extraordinary General Meeting of Shareholders (Please check the appropriate box with a cross or check-mark)

AGENDA FOR SHAREHOLDERSTHEEXTRAORDINARYGENERALMEETINGOF	FOR	AGAINST	ABSTAIN
1. Approval of the cancellation of 17,779,302 ordinary shares held in treasury by the Company acquired by the Company throughout the first tranche of its share buyback program, consequential reduction of the issued share capital of the Company by an amount of US$17,779,302 so as to bring it from its current amount of US$1,180,536,830 to US$1,162,757,528 represented by 1,162,757,528 ordinary shares with a nominal value of US$1.00 each; and consequential amendment of the first paragraph of

5 A shareholder who elects to have a proxy holder attend the Extraordinary General Meeting of Shareholders in person and vote by proxy, must submit (in addition to the Intention to Participate Form) the EGMS Proxy Form as soon as possible and, in any event, must be received by the Company on or before 23rd April 2024, at 24:00 (midnight), Central European Time. A shareholder who does not wish to attend the Extraordinary General Meeting of Shareholders but nonetheless wishes to vote by proxy at the Extraordinary General Meeting of Shareholders must only complete and return to the Company the EGMS Proxy Form (and need not submit the Intention to Participate Form) in which case the EGMS Proxy Form must be received by the Company on or before 16th April 2024, at 24:00 (midnight), Central European Time.

6 Please select either option 1 or option 2, by checking the appropriate box with a cross or check-mark and indicating, in the case you select option 1, the natural person or legal entity appointed to represent you at the meeting. If you select both options, option 2 will only be applicable if you do not indicate the name of the natural person or legal entity appointed to represent you at the meeting, or if such natural person or legal entity is not present or represented at the Extraordinary General Meeting of Shareholders.

7 Please indicate the name of the natural person or entity appointed to represent you at the Extraordinary General Meeting of Shareholders. You may appoint only one proxy holder to represent you at the Extraordinary General Meeting of Shareholders, except that: (i) if you hold your Shares through more than one securities account, you may appoint one proxy holder for each securities account; (ii) if you are acting professionally for the account of a natural person or legal entity you may appoint such natural person or legal entity, or any other third party designated by them, as proxy holder.

AGENDA FOR SHAREHOLDERSTHEEXTRAORDINARYGENERALMEETINGOF	FOR	AGAINST	ABSTAIN
article 5 "Share Capital" of the Company's articles of association to reflect the resolutions on this item of the agenda.

Please note, for purposes of assessing any potential conflicts of interest, that Francesco Giuseppe Bettiol, Marco Maria Domenico Tajana, Stefano Bassi, Javier Cayzac and Marcos Basaldella are employees of a subsidiary of the Company and that the chairperson of the Extraordinary General Meeting of Shareholders may potentially be an employee, a member of the board, a shareholder, an advisor or a service provider of the Company or of a subsidiary of the Company.

DATE:	_____________________________________________________
SHAREHOLDER'S NAME:	_____________________________________________________
SHAREHOLDER'S ADDRESS:	_____________________________________________________
NUMBER OF SHARES OF THE
COMPANY HELD ON 16TH APRIL
2024 AT 24:00 (MIDNIGHT),
CENTRAL EUROPEAN TIME:	________________________________________________________________
SIGNATURE:	_____________________________________________________
TITLE8:	_____________________________________________________