Tenaris : Form of Intention to Participate at the AGMS/EGMS

FORM OF INTENTION TO PARTICIPATE

AT THE ANNUAL GENERAL MEETING OF SHAREHOLDERS AND/OR THE EXTRAORDINARY

GENERAL MEETING OF SHAREHOLDERS OF TENARIS S.A.

TO BE HELD ON APRIL 30, 2024, STARTING AT 15:00 (CENTRAL EUROPEAN TIME)

AT 26, BOULERVARD ROYAL, 4TH FLOOR,

L-2449 LUXEMBOURG,

GRAND-DUCHY OF LUXEMBOURG1

Date: ________________ 2024

The undersigned,

Shareholder's name:

_____________________________________________________

Shareholder's address / registered office

_____________________________________________________

For natural persons only: passport or identity card number

_____________________________________________________

For legal entities only: registration number and authority

Registration number: _____________________________________________________ Registration authority:

_____________________________________________________

Number of shares of Tenaris S.A. held on 16th April 2024 at 24:00 (midnight), Central European Time

_____________________________________________________

1 If you are a holder of shares of Tenaris S.A. (the "Company") on 16th April 2024 at 24:00 (midnight), Central European Time (the "Shareholders' Record Time") and you wish to attend one or both meetings, you must complete and return to the Company this "Intention to Participate Form", which must be received by the Company, properly completed and signed, on or before the Shareholders' Record Time, by sending it to one of the postal addresses indicated in the convening notice or by sending an electronic message to the following electronic addresses:[e-mail] [e-mail].

You are required to provide reasonably satisfactory evidence to the Company (prior to the meetings) as to the number of shares of the Company held by you on the Shareholders' Record Time. Such evidence of shareholding must be provided by means of a certificate issued by each shareholder's bank or stockbroker, which must include at least: the shareholder's name, the shareholder's registered office/address, the number of shares held by the shareholder on the Shareholders' Record Time, the stock exchange on which the shareholder's shares trade and signature of the relevant shareholder's bank or stockbroker (the "Certificate of Shareholding").

hereby communicates to Tenaris S.A. (the "Company") that the undersigned intends to participate at the Annual General Meeting of Shareholders of the Company to be held on 30th April 2024, at 15:00 (Central European Time) and/or the Extraordinary General Meeting of

Shareholders of the Company to be held immediately after the adjournment of the Annual General Meeting of Shareholders of the Company.

SIGNATURE:	__________________________________________________________
BY2:	__________________________________________________________
TITLE3:	__________________________________________________________

• 2 Insert shareholder's name.

• 3 Only for legal entities: insert name and title of representative signatory.