www.lr.org/it Lloyd’s Register Quality Assurance S.r.l. T +39 02 365 754 1 Viale Monza, 265 E [email protected] 20126 Milano (MI)

To

TENARIS S.A. Société Anonyme Holding 13, Rue Beaumont L-1219 Luxembourg

k.a. Mr. Giovanni Brembilla

Date: 15 July 2020

Subject: Certificate Extension Validity Date

We hereby certify the extension of the validity of the following certificates in accordance with IAF ID3: 2011 Management of Extraordinary Events or Circumstances Affecting Abs, CBs, and Certified Organizations

Organization name: TENARIS S.A. Société Anonyme Holding Address: 13, Rue Beaumont - L-1219 Luxembourg Client No.: LRC6014676 Assessment standard: OHSAS 18001:2007

Scope of approval: Sales, Product Design and Development, Manufacture and Service Provision of Steel Bars, Steel Tubular Products and Accessories, gas cylinders, threading, coating and end protectors. Manufacture of sucker rods. Reception, storage and processing of ferrous scrap. Service for Management of Civil Construction, Mechanical and Electrical Services; Assembly of Equipment, Piping and Instrumentation Equipment and Industrial Plant. Activities associated with the production of electric power and steam.

Certificate number: LRC 6014676/OHS/U/EN/M Expiry date of current certificate: 21 July 2020 New expiry date: 21 January 2021

The renewal visit will be conducted as soon as the emergency related to COVID-19 is overcome and in any case not later than the new expiry date indicated above.

Yours sincerely

Alberto Melis Technical Manager Lloyd’s Register Quality Assurance Italy S.r.l.

Lloyd’s Register Quality Assurance Italy S.r.l. – Sede Legale: Piazza della Vittoria, 6 – 16121 Genova Cap. Soc. Euro 78.000,00 i.v. – CCIAA Genova REA 356347 – Cod. Fisc. / P.Iva 03568010106

A subsidiary of Lloyd’s Register Group Limited. Lloyd's Register Quality Assurance Limited (Reg. no. 1879370) is a limited company registered in England and Wales. Registered office: 71 Fenchurch Street, London, EC3M 4BS, UK. A member of the Lloyd’s Register Group.

CERTIFICATE OF APPROVAL

This is to certify that the Occupational Health & Safety Management System of: Tenaris S.A. Société Anonyme Holding 13, Rue Beaumont L-1219 Luxembourg R.C.S. Luxembourg B-85.203 has been approved by Lloyd's Register Quality Assurance to the following Standard:

OHSAS 18001:2007

The Occupational Health & Safety Management System is applicable to:

Sales, Product Design and Development, Manufacture and Service Provision of Steel Bars, Steel Tubular Products and Accessories, gas cylinders, threading, coating and end protectors. Manufacture of sucker rods. Reception, storage and processing of ferrous scrap. Service for Management of Civil Construction, Mechanical and Electrical Services; Assembly of Equipment, Piping and Instrumentation Equipment and Industrial Plant. Activities associated with the production of electric power and steam.

This certificate is valid only in association with the certificate schedule bearing the same number on which the locations applicable to this approval are listed.

Approval Certificate Original Approval: 22nd July 2017 No: LRC 6014676/OHS/U/EN/M Current Certificate: 17th December 2019 Certificate Expiry: 21st July 2020

______Issued by: Lloyd's Register Quality Assurance Italy Srl for and on behalf of Lloyd's Register Quality Assurance L

This document is subject to the provision below Via Cadorna, 69 20090 Vimodrone (MI) For and on behalf of 1 Trinity Park, Bickenhill Lane, Birmingham, B37 7ES, - United Kingdom. This approval is carried out in accordance with the LRQA assessment and certification procedures and monitored by LRQA. The use of the UKAS Accreditation Mark indicates Accreditation in respect of those activities covered by the Accreditation Certificate Number 001

Lloyd’s Register Group Limited, its affiliates and subsidiaries, including Lloyd’s Register Quality Assurance Limited (LRQA), and their respective officers, employees or agents are, individually and collectively, referred to in this clause as ‘Lloyd’s Register’. Lloyd’s Register assumes no responsibility and shall not be liable to any person for any loss, damage or expense caused by reliance on the information or advice in this document or howsoever provided, unless that person has signed a contract with the relevant Lloyd’s Register entity for the provision of this information or advice and in that case any responsibility or liability is exclusively on the terms and conditions set out in that contract

CERTIFICATE SCHEDULE

Tenaris S.A. Société Anonyme Holding 13, Rue Beaumont L-1219 Luxembourg R.C.S. Luxembourg B-85.203 Locations Activities

Tenaris Manufacture, of steel round bar seamless hot Siderca (Siderca S.A.I.C.) rolled and cold drawn tubular steel products and Dr. Simini 250 accessories. Provision of services associated to (2804) Campana, Buenos Aires these products. Argentina LRC 6014676/OHS/U/EN/M/001

Tenaris Sucker Rods Manufacturing for Oil Industry, Metalmecanica S.A. Protectors and Accessories: Couplings, Nipples, Ruta Prov. 55 - Km 754.1 Cemented Pipes and Pony Rods. (5730) Villa Mercedes, San Luis LRC 6014676/OHS/U/EN/M/002 Argentina

Tenaris Sucker Rods Manufacturing for Oil Industry and Metalmecánica S.A. Accessories: Couplings. Ruta Nac. 7, Km 701 LRC 6014676/OHS/U/EN/M/003 (5730) Villa Mercedes, San Luis Argentina

Approval Certificate Original Approval: 22nd July 2017 No: LRC 6014676/OHS/U/EN/M Current Certificate: 17th December 2019

Certificate Expiry: 21st July 2020

Page 1 of 20

This document is subject to the provision below Via Cadorna, 69 20090 Vimodrone (MI) For and on behalf of 1 Trinity Park, Bickenhill Lane, Birmingham, B37 7ES, - United Kingdom. This approval is carried out in accordance with the LRQA assessment and certification procedures and monitored by LRQA. The use of the UKAS Accreditation Mark indicates Accreditation in respect of those activities covered by the Accreditation Certificate Number 001

Lloyd’s Register Group Limited, its affiliates and subsidiaries, including Lloyd’s Register Quality Assurance Limited (LRQA), and their respective officers, employees or agents are, individually and collectively, referred to in this clause as ‘Lloyd’s Register’. Lloyd’s Register assumes no responsibility and shall not be liable to any person for any loss, damage or expense caused by reliance on the information or advice in this document or howsoever provided, unless that person has signed a contract with the relevant Lloyd’s Register entity for the provision of this information or advice and in that case any responsibility or liability is exclusively on the terms and conditions set out in that contract

CERTIFICATE SCHEDULE

Tenaris S.A. Société Anonyme Holding 13, Rue Beaumont L-1219 Luxembourg R.C.S. Luxembourg B-85.203 Locations Activities Tenaris Manufacturing of Cemented Pipes. Metalmecánica S.A. LRC 6014676/OHS/U/EN/M/004 Ruta Prov. 24, Km 7.5 (5730) Villa Mercedes, San Luis Argentina

TENARIS - SCRAP SERVICE S.A. Reception, Storage, Processing and Dispatch Ruta 6 km 203,436 of Ferrous Scrap. Campana LRC 6014676/OHS/U/EN/M/006 Provincia de Buenos Aires Argentina

Approval Certificate Original Approval: 22nd July 2017 No: LRC 6014676/OHS/U/EN/M Current Certificate: 17th December 2019

Certificate Expiry: 21st July 2020

Page 2 of 20

This document is subject to the provision below Via Cadorna, 69 20090 Vimodrone (MI) For and on behalf of 1 Trinity Park, Bickenhill Lane, Birmingham, B37 7ES, - United Kingdom. This approval is carried out in accordance with the LRQA assessment and certification procedures and monitored by LRQA. The use of the UKAS Accreditation Mark indicates Accreditation in respect of those activities covered by the Accreditation Certificate Number 001

Lloyd’s Register Group Limited, its affiliates and subsidiaries, including Lloyd’s Register Quality Assurance Limited (LRQA), and their respective officers, employees or agents are, individually and collectively, referred to in this clause as ‘Lloyd’s Register’. Lloyd’s Register assumes no responsibility and shall not be liable to any person for any loss, damage or expense caused by reliance on the information or advice in this document or howsoever provided, unless that person has signed a contract with the relevant Lloyd’s Register entity for the provision of this information or advice and in that case any responsibility or liability is exclusively on the terms and conditions set out in that contract

CERTIFICATE SCHEDULE

Tenaris S.A. Société Anonyme Holding 13, Rue Beaumont L-1219 Luxembourg R.C.S. Luxembourg B-85.203 Locations Activities Tenaris Reception, Storage, Processing and Dispatch of SCRAP SERVICE S.A. Ferrous Scrap. Ruta de la Tradición 7424 LRC 6014676/OHS/U/EN/M/007 (7424) Esteban Echeverría, Buenos Aires Argentina

Tenaris Reception, Storage, Processing and Dispatch of SCRAP SERVICE S.A. Ferrous Scrap. Avda. General Savio 4655 LRC 6014676/OHS/U/EN/M/008 (5014) Córdoba, Córdoba Argentina

Tenaris Reception, Storage, Processing and Dispatch of SCRAP SERVICE S.A. Ferrous Scrap. Ruta 8 Km 18 4846 LRC 6014676/OHS/U/EN/M/009 (1650) San Martín, Buenos Aires Argentina

Approval Certificate Original Approval: 22nd July 2017 No: LRC 6014676/OHS/U/EN/M Current Certificate: 17th December 2019

Certificate Expiry: 21st July 2020

Page 3 of 20

This document is subject to the provision below Via Cadorna, 69 20090 Vimodrone (MI) For and on behalf of 1 Trinity Park, Bickenhill Lane, Birmingham, B37 7ES, - United Kingdom. This approval is carried out in accordance with the LRQA assessment and certification procedures and monitored by LRQA. The use of the UKAS Accreditation Mark indicates Accreditation in respect of those activities covered by the Accreditation Certificate Number 001

Lloyd’s Register Group Limited, its affiliates and subsidiaries, including Lloyd’s Register Quality Assurance Limited (LRQA), and their respective officers, employees or agents are, individually and collectively, referred to in this clause as ‘Lloyd’s Register’. Lloyd’s Register assumes no responsibility and shall not be liable to any person for any loss, damage or expense caused by reliance on the information or advice in this document or howsoever provided, unless that person has signed a contract with the relevant Lloyd’s Register entity for the provision of this information or advice and in that case any responsibility or liability is exclusively on the terms and conditions set out in that contract

CERTIFICATE SCHEDULE

Tenaris S.A. Société Anonyme Holding 13, Rue Beaumont L-1219 Luxembourg R.C.S. Luxembourg B-85.203 Locations Activities

Tenaris Manufacture and service provision of welded Confab Industrial S.A. Av. Gastao Vidigal carbon and micro alloyed steel tubes coated and Neto 475 (12414-020) Cidade Nova uncoated and structural tubes. Storage and Pindamonhangaba, distribution of pipes and supply services of São Paulo inspections of pipes. Brazil LRC 6014676/OHS/U/EN/M/010

Tenaris Service for Management of Civil Construction, Confab Montagens Ltda. Mechanical and Electrical Services; Assembly of Rua Dr. Gonzaga, s/n Equipment, Piping and Instrumentation (12440-200) Moreira Cesar Equipment and Industrial Plant. Pindamonhangaba, LRC 6014676/OHS/U/EN/M/011 São Paulo Brazil

Approval Certificate Original Approval: 22nd July 2017 No: LRC 6014676/OHS/U/EN/M Current Certificate: 17th December 2019

Certificate Expiry: 21st July 2020

Page 4 of 20

This document is subject to the provision below Via Cadorna, 69 20090 Vimodrone (MI) For and on behalf of 1 Trinity Park, Bickenhill Lane, Birmingham, B37 7ES, - United Kingdom. This approval is carried out in accordance with the LRQA assessment and certification procedures and monitored by LRQA. The use of the UKAS Accreditation Mark indicates Accreditation in respect of those activities covered by the Accreditation Certificate Number 001

Lloyd’s Register Group Limited, its affiliates and subsidiaries, including Lloyd’s Register Quality Assurance Limited (LRQA), and their respective officers, employees or agents are, individually and collectively, referred to in this clause as ‘Lloyd’s Register’. Lloyd’s Register assumes no responsibility and shall not be liable to any person for any loss, damage or expense caused by reliance on the information or advice in this document or howsoever provided, unless that person has signed a contract with the relevant Lloyd’s Register entity for the provision of this information or advice and in that case any responsibility or liability is exclusively on the terms and conditions set out in that contract

CERTIFICATE SCHEDULE

Tenaris S.A. Société Anonyme Holding 13, Rue Beaumont L-1219 Luxembourg R.C.S. Luxembourg B-85.203 Locations Activities Tenaris Inspection, Storage and Distribution of pipes. Confab Industrial S.A. LRC 6014676/OHS/U/EN/M/012 Rio das Ostras Rua do Sondador s/n – Quadra H Lote 10 E 11 Zona Especial de Negocios Rio das Ostras CEP 28890-000 Rio de Janeiro, Brazil

Tenaris Design and Manufacture of Equipment for Confab Industrial S.A - Negocio Petroleum, Petrochemical, Pulp and Paper, Equipamentos Rua Dr. Gonzaga, s/n Power, Metallurgy and Mining such as: Pressure (12440-200) Moreira Cesar Vessels, Reactors, Process Towers, Boilers, Heat Pindamonhangaba, Exchangers, Evaporators, Fired Heaters, Blast São Paulo Furnaces and Steel Converter. Management of Brazil Assembly Services. LRC 6014676/OHS/U/EN/M/013

Approval Certificate Original Approval: 22nd July 2017 No: LRC 6014676/OHS/U/EN/M Current Certificate: 17th December 2019

Certificate Expiry: 21st July 2020

Page 5 of 20

This document is subject to the provision below Via Cadorna, 69 20090 Vimodrone (MI) For and on behalf of 1 Trinity Park, Bickenhill Lane, Birmingham, B37 7ES, - United Kingdom. This approval is carried out in accordance with the LRQA assessment and certification procedures and monitored by LRQA. The use of the UKAS Accreditation Mark indicates Accreditation in respect of those activities covered by the Accreditation Certificate Number 001

Lloyd’s Register Group Limited, its affiliates and subsidiaries, including Lloyd’s Register Quality Assurance Limited (LRQA), and their respective officers, employees or agents are, individually and collectively, referred to in this clause as ‘Lloyd’s Register’. Lloyd’s Register assumes no responsibility and shall not be liable to any person for any loss, damage or expense caused by reliance on the information or advice in this document or howsoever provided, unless that person has signed a contract with the relevant Lloyd’s Register entity for the provision of this information or advice and in that case any responsibility or liability is exclusively on the terms and conditions set out in that contract

CERTIFICATE SCHEDULE

Tenaris S.A. Société Anonyme Holding 13, Rue Beaumont L-1219 Luxembourg R.C.S. Luxembourg B-85.203 Locations Activities Tenaris Manufacture and technical support services for Confab Hastes de Bombeio S.A. steel sucker rods and accessories, polished rods, Rua Dr. Gonzaga, s/n sucker rods guides and sinker bars. (12440-200) Moreira Cesar LRC 6014676/OHS/U/EN/M/046 Pindamonhangaba, São Paulo Brazil

Tenaris Manufacture and Service Provision of Steel Bars, Tamsa (Tubos de Acero de México S.A.) Hot Rolled and Cold Drawn, Steel Tubular Carretera México - Veracruz Vía Xalapa Km. Products and Accessories, Couplings, Sub- 433.7 (91697) Veracruz, Veracruz couplings, Protectors, Sucker Rods and Sucker México Rods guides. LRC 6014676/OHS/U/EN/M/014

Approval Certificate Original Approval: 22nd July 2017 No: LRC 6014676/OHS/U/EN/M Current Certificate: 17th December 2019

Certificate Expiry: 21st July 2020

Page 6 of 20

This document is subject to the provision below Via Cadorna, 69 20090 Vimodrone (MI) For and on behalf of 1 Trinity Park, Bickenhill Lane, Birmingham, B37 7ES, - United Kingdom. This approval is carried out in accordance with the LRQA assessment and certification procedures and monitored by LRQA. The use of the UKAS Accreditation Mark indicates Accreditation in respect of those activities covered by the Accreditation Certificate Number 001

Lloyd’s Register Group Limited, its affiliates and subsidiaries, including Lloyd’s Register Quality Assurance Limited (LRQA), and their respective officers, employees or agents are, individually and collectively, referred to in this clause as ‘Lloyd’s Register’. Lloyd’s Register assumes no responsibility and shall not be liable to any person for any loss, damage or expense caused by reliance on the information or advice in this document or howsoever provided, unless that person has signed a contract with the relevant Lloyd’s Register entity for the provision of this information or advice and in that case any responsibility or liability is exclusively on the terms and conditions set out in that contract

CERTIFICATE SCHEDULE

Tenaris S.A. Société Anonyme Holding 13, Rue Beaumont L-1219 Luxembourg R.C.S. Luxembourg B-85.203 Locations Activities Tenaris Manufacture and sales of seamless butt-weld Tamsa (Tubos de Acero de México S.A.) fittings in carbon and alloy steel. Division Conexiones LRC 6014676/OHS/U/EN/M/015 Carretera Monterrey – Laredo Km 24.2 (65550) Ciénega de Flores, Nuevo León México.

Tenaris Storage yards and field services building. Tamsa (Tubos de Acero de México S.A.) LRC 6014676/OHS/U/EN/M/016 (Coatzintla) Carretera Coatzintla – Palma Sola, Km 61.1 Poblacion “La Laja” (93160) Poza Rica , Veracruz Mexico

Approval Certificate Original Approval: 22nd July 2017 No: LRC 6014676/OHS/U/EN/M Current Certificate: 17th December 2019

Certificate Expiry: 21st July 2020

Page 7 of 20

This document is subject to the provision below Via Cadorna, 69 20090 Vimodrone (MI) For and on behalf of 1 Trinity Park, Bickenhill Lane, Birmingham, B37 7ES, - United Kingdom. This approval is carried out in accordance with the LRQA assessment and certification procedures and monitored by LRQA. The use of the UKAS Accreditation Mark indicates Accreditation in respect of those activities covered by the Accreditation Certificate Number 001

Lloyd’s Register Group Limited, its affiliates and subsidiaries, including Lloyd’s Register Quality Assurance Limited (LRQA), and their respective officers, employees or agents are, individually and collectively, referred to in this clause as ‘Lloyd’s Register’. Lloyd’s Register assumes no responsibility and shall not be liable to any person for any loss, damage or expense caused by reliance on the information or advice in this document or howsoever provided, unless that person has signed a contract with the relevant Lloyd’s Register entity for the provision of this information or advice and in that case any responsibility or liability is exclusively on the terms and conditions set out in that contract

CERTIFICATE SCHEDULE

Tenaris S.A. Société Anonyme Holding 13, Rue Beaumont L-1219 Luxembourg R.C.S. Luxembourg B-85.203 Locations Activities

Tenaris Storage yards and field services building. Tamsa (Tubos de Acero de México S.A.) LRC 6014676/OHS/U/EN/M/017 (Comalcalco) Km 150 Carretera Cárdenas- Comalcalco. Ranchería Oriente, 5 sección Col. Centro (86650) Comalcalco, Tabasco Mexico

Tenaris Manufacture of welded steel line pipe, casing Tubocaribe Ltda and tubing. Electro metallic and processing of Parque Industrial Carlos Velez Pombo KM 1 tubular products. Application of single and Via Turbaco multilayer coatings. Cartagena, Bolivar LRC 6014676/OHS/U/EN/M/018 Colombia

Approval Certificate Original Approval: 22nd July 2017 No: LRC 6014676/OHS/U/EN/M Current Certificate: 17th December 2019

Certificate Expiry: 21st July 2020

Page 8 of 20

This document is subject to the provision below Via Cadorna, 69 20090 Vimodrone (MI) For and on behalf of 1 Trinity Park, Bickenhill Lane, Birmingham, B37 7ES, - United Kingdom. This approval is carried out in accordance with the LRQA assessment and certification procedures and monitored by LRQA. The use of the UKAS Accreditation Mark indicates Accreditation in respect of those activities covered by the Accreditation Certificate Number 001

Lloyd’s Register Group Limited, its affiliates and subsidiaries, including Lloyd’s Register Quality Assurance Limited (LRQA), and their respective officers, employees or agents are, individually and collectively, referred to in this clause as ‘Lloyd’s Register’. Lloyd’s Register assumes no responsibility and shall not be liable to any person for any loss, damage or expense caused by reliance on the information or advice in this document or howsoever provided, unless that person has signed a contract with the relevant Lloyd’s Register entity for the provision of this information or advice and in that case any responsibility or liability is exclusively on the terms and conditions set out in that contract

CERTIFICATE SCHEDULE

Tenaris S.A. Société Anonyme Holding 13, Rue Beaumont L-1219 Luxembourg R.C.S. Luxembourg B-85.203 Locations Activities Tenaris Manufacture of welded pipes (OCTG and Line Hickman (Maverick Tube Corporation) 5010 Pipe), and externally coated line pipe. North County Road 967 LRC 6014676/OHS/U/EN/M/019 Blytheville, AR 72315 USA

Tenaris Manufacture and Service of Coiled Tubing for Downhole Center (Tenaris Coiled Tubes, LLC) the Oil and Gas Industry. 8615 East Sam Houston Parkway LRC 6014676/OHS/U/EN/M/020 Houston, TX 77044 USA

Tenaris Threading and Surface Coating of Casing and McCarty (Hydril Company) Tubing Steel Pipes and Accessories. Sales and 302 McCarty Drive Storage of Tubular Product and Accessories. Houston, TX 77029 LRC 6014676/OHS/U/EN/M/021 USA

Approval Certificate Original Approval: 22nd July 2017 No: LRC 6014676/OHS/U/EN/M Current Certificate: 17th December 2019

Certificate Expiry: 21st July 2020

Page 9 of 20

This document is subject to the provision below Via Cadorna, 69 20090 Vimodrone (MI) For and on behalf of 1 Trinity Park, Bickenhill Lane, Birmingham, B37 7ES, - United Kingdom. This approval is carried out in accordance with the LRQA assessment and certification procedures and monitored by LRQA. The use of the UKAS Accreditation Mark indicates Accreditation in respect of those activities covered by the Accreditation Certificate Number 001

Lloyd’s Register Group Limited, its affiliates and subsidiaries, including Lloyd’s Register Quality Assurance Limited (LRQA), and their respective officers, employees or agents are, individually and collectively, referred to in this clause as ‘Lloyd’s Register’. Lloyd’s Register assumes no responsibility and shall not be liable to any person for any loss, damage or expense caused by reliance on the information or advice in this document or howsoever provided, unless that person has signed a contract with the relevant Lloyd’s Register entity for the provision of this information or advice and in that case any responsibility or liability is exclusively on the terms and conditions set out in that contract

CERTIFICATE SCHEDULE

Tenaris S.A. Société Anonyme Holding 13, Rue Beaumont L-1219 Luxembourg R.C.S. Luxembourg B-85.203 Locations Activities Tenaris Threading of casing and tubing steel pipes and Bakersfield (Hydril Company) accessories; sales, service provision and storage 3237 Patton Way of tubular products and accessories. Bakersfield, CA 93308-5717 LRC 6014676/OHS/U/EN/M/022 USA

Tenaris Manufacture and Service provision of hot rolled Bay City (Tenaris Bay City Inc.) seamless steel tubular products. 7960 SH-35 LRC 6014676/OHS/U/EN/M/023 Bay City, TX 77414 USA

Tenaris Manufacture of Welded Line Pipe, Casing and Conroe (Maverick Tube Corporation) Tubing. 699 FM 3083, Conroe, TX, 77301, United LRC 6014676/OHS/U/EN/M/049 States

Approval Certificate Original Approval: 22nd July 2017 No: LRC 6014676/OHS/U/EN/M Current Certificate: 17th December 2019

Certificate Expiry: 21st July 2020

Page 10 of 20

This document is subject to the provision below Via Cadorna, 69 20090 Vimodrone (MI) For and on behalf of 1 Trinity Park, Bickenhill Lane, Birmingham, B37 7ES, - United Kingdom. This approval is carried out in accordance with the LRQA assessment and certification procedures and monitored by LRQA. The use of the UKAS Accreditation Mark indicates Accreditation in respect of those activities covered by the Accreditation Certificate Number 001

Lloyd’s Register Group Limited, its affiliates and subsidiaries, including Lloyd’s Register Quality Assurance Limited (LRQA), and their respective officers, employees or agents are, individually and collectively, referred to in this clause as ‘Lloyd’s Register’. Lloyd’s Register assumes no responsibility and shall not be liable to any person for any loss, damage or expense caused by reliance on the information or advice in this document or howsoever provided, unless that person has signed a contract with the relevant Lloyd’s Register entity for the provision of this information or advice and in that case any responsibility or liability is exclusively on the terms and conditions set out in that contract

CERTIFICATE SCHEDULE

Tenaris S.A. Société Anonyme Holding 13, Rue Beaumont L-1219 Luxembourg R.C.S. Luxembourg B-85.203 Locations Activities Tenaris Manufacture of Hot Rolled Seamless Steel Pipe AlgomaTubes Inc. including Heat Treatment and Threading of 547 Wallace Terrace, Tubular Products. Sault Ste. Marie, Ontario, P6C 1L9 LRC 6014676/OHS/U/EN/M/024 Canada

Tenaris Manufacture of welded line pipe, casing and Prudential (Prudential Steel ULC) tubing. 8919 Barlow Trail SE LRC 6014676/OHS/U/EN/M/047 Calgary, Alberta T2C 2N7 Canada

Tenaris Nisku Manufacture of Premium Connections, (Hydril Canadian Company Limited Accessories and Couplings for the Oil and Gas Partnership) Industry. 2307 8th Street LRC 6014676/OHS/U/EN/M/025 Nisku, Alberta, T9E 7Z3 Canada

Approval Certificate Original Approval: 22nd July 2017 No: LRC 6014676/OHS/U/EN/M Current Certificate: 17th December 2019

Certificate Expiry: 21st July 2020

Page 11 of 20

This document is subject to the provision below Via Cadorna, 69 20090 Vimodrone (MI) For and on behalf of 1 Trinity Park, Bickenhill Lane, Birmingham, B37 7ES, - United Kingdom. This approval is carried out in accordance with the LRQA assessment and certification procedures and monitored by LRQA. The use of the UKAS Accreditation Mark indicates Accreditation in respect of those activities covered by the Accreditation Certificate Number 001

Lloyd’s Register Group Limited, its affiliates and subsidiaries, including Lloyd’s Register Quality Assurance Limited (LRQA), and their respective officers, employees or agents are, individually and collectively, referred to in this clause as ‘Lloyd’s Register’. Lloyd’s Register assumes no responsibility and shall not be liable to any person for any loss, damage or expense caused by reliance on the information or advice in this document or howsoever provided, unless that person has signed a contract with the relevant Lloyd’s Register entity for the provision of this information or advice and in that case any responsibility or liability is exclusively on the terms and conditions set out in that contract

CERTIFICATE SCHEDULE

Tenaris S.A. Société Anonyme Holding 13, Rue Beaumont L-1219 Luxembourg R.C.S. Luxembourg B-85.203 Locations Activities Tenaris Manufacture, sales of seamless steel hot rolled (Dalmine S.p.A.) Piazza Caduti 6 products, bars and accessories, logistic services Luglio 1944, 1 and power plant generation. Receipt, storage 24044 Dalmine, and Recovery of ferrous scrap, temporary Italy storage of industrial hazardous waste. LRC 6014676/OHS/U/EN/M/026

Tenaris Design, manufacture and sale of steel gas Sabbio Bergamasco (Dalmine S.p.A.) cylinders and logistic services. Via , 2 LRC 6014676/OHS/U/EN/M/027 24044 Sabbio Bergamasco, Bergamo Italy

Tenaris Manufacturing of welded steel tubes, coated Piombino (Dalmine S.p.A.) and uncoated and logistic services. Località Ischia di Crociano LRC 6014676/OHS/U/EN/M/028 57025 Piombino, Livorno Italy

Approval Certificate Original Approval: 22nd July 2017 No: LRC 6014676/OHS/U/EN/M Current Certificate: 17th December 2019

Certificate Expiry: 21st July 2020

Page 12 of 20

This document is subject to the provision below Via Cadorna, 69 20090 Vimodrone (MI) For and on behalf of 1 Trinity Park, Bickenhill Lane, Birmingham, B37 7ES, - United Kingdom. This approval is carried out in accordance with the LRQA assessment and certification procedures and monitored by LRQA. The use of the UKAS Accreditation Mark indicates Accreditation in respect of those activities covered by the Accreditation Certificate Number 001

Lloyd’s Register Group Limited, its affiliates and subsidiaries, including Lloyd’s Register Quality Assurance Limited (LRQA), and their respective officers, employees or agents are, individually and collectively, referred to in this clause as ‘Lloyd’s Register’. Lloyd’s Register assumes no responsibility and shall not be liable to any person for any loss, damage or expense caused by reliance on the information or advice in this document or howsoever provided, unless that person has signed a contract with the relevant Lloyd’s Register entity for the provision of this information or advice and in that case any responsibility or liability is exclusively on the terms and conditions set out in that contract

CERTIFICATE SCHEDULE

Tenaris S.A. Société Anonyme Holding 13, Rue Beaumont L-1219 Luxembourg R.C.S. Luxembourg B-85.203 Locations Activities

Tenaris Manufacturing of hot rolled steel seamless tubes Arcore (Dalmine S.p.A.) and logistic services. Manufacturing Center LRC 6014676/OHS/U/EN/M/029 Via A. Grandi, 100 20862 Arcore, Monza e della Brianza Italy

Tenaris Manufacturing of cold drawn steel tubes and (Dalmine S.p.A) tubular parts and logistic services. Temporary Via Piò, 30 storage of industrial hazardous waste. 24062 Costa Volpino, Bergamo LRC 6014676/OHS/U/EN/M/030 Italy

Approval Certificate Original Approval: 22nd July 2017 No: LRC 6014676/OHS/U/EN/M Current Certificate: 17th December 2019

Certificate Expiry: 21st July 2020

Page 13 of 20

This document is subject to the provision below Via Cadorna, 69 20090 Vimodrone (MI) For and on behalf of 1 Trinity Park, Bickenhill Lane, Birmingham, B37 7ES, - United Kingdom. This approval is carried out in accordance with the LRQA assessment and certification procedures and monitored by LRQA. The use of the UKAS Accreditation Mark indicates Accreditation in respect of those activities covered by the Accreditation Certificate Number 001

Lloyd’s Register Group Limited, its affiliates and subsidiaries, including Lloyd’s Register Quality Assurance Limited (LRQA), and their respective officers, employees or agents are, individually and collectively, referred to in this clause as ‘Lloyd’s Register’. Lloyd’s Register assumes no responsibility and shall not be liable to any person for any loss, damage or expense caused by reliance on the information or advice in this document or howsoever provided, unless that person has signed a contract with the relevant Lloyd’s Register entity for the provision of this information or advice and in that case any responsibility or liability is exclusively on the terms and conditions set out in that contract

CERTIFICATE SCHEDULE

Tenaris S.A. Société Anonyme Holding 13, Rue Beaumont L-1219 Luxembourg R.C.S. Luxembourg B-85.203 Locations Activities Tenaris Mechanical machining of pipes, manufacture of Dalmine OCTG Accesories Center special parts and logistics services. (Dalmine S.p.A.) LRC 6014676/OHS/U/EN/M/031 Via Friuli, 7/B 24044 Dalmine, Bergamo ItalyItaly

Tenaris Manufacture, sales, storage and services Silcotub (S.C. Silcotub S.A.) provision of seamless steel hot rolled and cold 93 Mihai Viteazu Blv 450131 Zalau, Salaj drawn tubular products and accessories. County LRC 6014676/OHS/U/EN/M/032 Romania

Tenaris Manufacture and sales of continuously cast steel Calarasi (S.C. Silcotub S.A.) bars, for pipes production, profiles and for other 62 Prelungirea Bucuresti Road 910153 steel products. Calarasi, Calarasi County LRC 6014676/OHS/U/EN/M/033 Romania

Approval Certificate Original Approval: 22nd July 2017 No: LRC 6014676/OHS/U/EN/M Current Certificate: 17th December 2019

Certificate Expiry: 21st July 2020

Page 14 of 20

This document is subject to the provision below Via Cadorna, 69 20090 Vimodrone (MI) For and on behalf of 1 Trinity Park, Bickenhill Lane, Birmingham, B37 7ES, - United Kingdom. This approval is carried out in accordance with the LRQA assessment and certification procedures and monitored by LRQA. The use of the UKAS Accreditation Mark indicates Accreditation in respect of those activities covered by the Accreditation Certificate Number 001

Lloyd’s Register Group Limited, its affiliates and subsidiaries, including Lloyd’s Register Quality Assurance Limited (LRQA), and their respective officers, employees or agents are, individually and collectively, referred to in this clause as ‘Lloyd’s Register’. Lloyd’s Register assumes no responsibility and shall not be liable to any person for any loss, damage or expense caused by reliance on the information or advice in this document or howsoever provided, unless that person has signed a contract with the relevant Lloyd’s Register entity for the provision of this information or advice and in that case any responsibility or liability is exclusively on the terms and conditions set out in that contract

CERTIFICATE SCHEDULE

Tenaris S.A. Société Anonyme Holding 13, Rue Beaumont L-1219 Luxembourg R.C.S. Luxembourg B-85.203 Locations Activities Tenaris Manufacture, sales, storage and service provision Campina Sucker Rods (S.C. Silcotub S.A.) of sucker rods and accessories. 1 Orizontului Street LRC 6014676/OHS/U/EN/M/034 105600, Campina, Prahova County Romania

Tenaris Storage and sales of seamless steel hot rolled Ploiesti (S.C. Silcotub S.A.) tubular products, accessories and services Targoviste Road, Km. 8 provision. 100213 Industrial Park Ploiesti Prahova LRC 6014676/OHS/U/EN/M/035 County Romania

Tenaris Collection and storage of scrap. Popesti (S.C. Silcotub S.A.) LRC 6014676/OHS/U/EN/M/036 91 Soseaua de Centura Popesti Leordeni,Ilfov County Romania

Approval Certificate Original Approval: 22nd July 2017 No: LRC 6014676/OHS/U/EN/M Current Certificate: 17th December 2019

Certificate Expiry: 21st July 2020

Page 15 of 20

This document is subject to the provision below Via Cadorna, 69 20090 Vimodrone (MI) For and on behalf of 1 Trinity Park, Bickenhill Lane, Birmingham, B37 7ES, - United Kingdom. This approval is carried out in accordance with the LRQA assessment and certification procedures and monitored by LRQA. The use of the UKAS Accreditation Mark indicates Accreditation in respect of those activities covered by the Accreditation Certificate Number 001

Lloyd’s Register Group Limited, its affiliates and subsidiaries, including Lloyd’s Register Quality Assurance Limited (LRQA), and their respective officers, employees or agents are, individually and collectively, referred to in this clause as ‘Lloyd’s Register’. Lloyd’s Register assumes no responsibility and shall not be liable to any person for any loss, damage or expense caused by reliance on the information or advice in this document or howsoever provided, unless that person has signed a contract with the relevant Lloyd’s Register entity for the provision of this information or advice and in that case any responsibility or liability is exclusively on the terms and conditions set out in that contract

CERTIFICATE SCHEDULE

Tenaris S.A. Société Anonyme Holding 13, Rue Beaumont L-1219 Luxembourg R.C.S. Luxembourg B-85.203 Locations Activities Tenaris Global Services (UK) Limited Processing and threading of steel tubular Minto Avenue, Altens Industrial Estate products (casing tubing line pipe and Aberdeen, AB123JZ accessories), sales service provision and storage Scotland of tubular products and accessories. U.K. LRC 6014676/OHS/U/EN/M/037

Tenaris Service provision and storage of steel tubular Badentoy (Tenaris Global Services (UK) products and accessories. Limited) LRC 6014676/OHS/U/EN/M/051 Badentoy Industrial Estate, Portlethen - Aberdeen, AB12 4YD, United Kingdom

Tenaris Processing and threading of steel tubular Denmark products (casing tubing line pipe and Måde Industrivej 38 DK-6705 Esbjerg Ø accessories), sales service provision and storage Denmark of tubular products and accessories. LRC 6014676/OHS/U/EN/M/038

Approval Certificate Original Approval: 22nd July 2017 No: LRC 6014676/OHS/U/EN/M Current Certificate: 17th December 2019

Certificate Expiry: 21st July 2020

Page 16 of 20

This document is subject to the provision below Via Cadorna, 69 20090 Vimodrone (MI) For and on behalf of 1 Trinity Park, Bickenhill Lane, Birmingham, B37 7ES, - United Kingdom. This approval is carried out in accordance with the LRQA assessment and certification procedures and monitored by LRQA. The use of the UKAS Accreditation Mark indicates Accreditation in respect of those activities covered by the Accreditation Certificate Number 001

Lloyd’s Register Group Limited, its affiliates and subsidiaries, including Lloyd’s Register Quality Assurance Limited (LRQA), and their respective officers, employees or agents are, individually and collectively, referred to in this clause as ‘Lloyd’s Register’. Lloyd’s Register assumes no responsibility and shall not be liable to any person for any loss, damage or expense caused by reliance on the information or advice in this document or howsoever provided, unless that person has signed a contract with the relevant Lloyd’s Register entity for the provision of this information or advice and in that case any responsibility or liability is exclusively on the terms and conditions set out in that contract

CERTIFICATE SCHEDULE

Tenaris S.A. Société Anonyme Holding 13, Rue Beaumont L-1219 Luxembourg R.C.S. Luxembourg B-85.203 Locations Activities Tenaris Processing and threading of tubular products SPIJ (PT. Seamless Pipe Indonesia Jaya) (casing, tubing, seamless line pipe) and Krakatau Industrial Estate Cilegon accessories, service and storage provision of Banten Jl. Antartika I Kav. F4 tubular products and accessories. 42443 Cilegon LRC 6014676/OHS/U/EN/M/039 Indonesia

Tenaris Threading of casing and tubing steel pipes and Batam (PT Hydril Indonesia) accessories; sales, service provision and storage Kabil Industrial Estate, JI. Hang of tubular products and accessories. Kesturi 1 Kav 23 & 24, Kabil Batam Riau LRC 6014676/OHS/U/EN/M/040 Islands 29467 Indonesia

Tenaris Processing and threading, sales, technical and Qingdao (Steel Pipes Ltd) No.2001, Kunlun integrated Supply Chain management service Shan South Road provision of steel tubular products and Eco & Tech Development Zone, Qingdao City accessories. PR China LRC 6014676/OHS/U/EN/M/041 Approval Certificate Original Approval: 22nd July 2017 No: LRC 6014676/OHS/U/EN/M Current Certificate: 17th December 2019

Certificate Expiry: 21st July 2020

Page 17 of 20

This document is subject to the provision below Via Cadorna, 69 20090 Vimodrone (MI) For and on behalf of 1 Trinity Park, Bickenhill Lane, Birmingham, B37 7ES, - United Kingdom. This approval is carried out in accordance with the LRQA assessment and certification procedures and monitored by LRQA. The use of the UKAS Accreditation Mark indicates Accreditation in respect of those activities covered by the Accreditation Certificate Number 001

Lloyd’s Register Group Limited, its affiliates and subsidiaries, including Lloyd’s Register Quality Assurance Limited (LRQA), and their respective officers, employees or agents are, individually and collectively, referred to in this clause as ‘Lloyd’s Register’. Lloyd’s Register assumes no responsibility and shall not be liable to any person for any loss, damage or expense caused by reliance on the information or advice in this document or howsoever provided, unless that person has signed a contract with the relevant Lloyd’s Register entity for the provision of this information or advice and in that case any responsibility or liability is exclusively on the terms and conditions set out in that contract

CERTIFICATE SCHEDULE

Tenaris S.A. Société Anonyme Holding 13, Rue Beaumont L-1219 Luxembourg R.C.S. Luxembourg B-85.203 Locations Activities

Tenaris Processing and threading of tubular products Tenaris Saudi Arabia Ltd (casing, tubing, seamless line pipe) and 2nd Industrial City - PO BOX 12441 Damman accessories, service and storage provision of 31473 - Eastern Province tubular products and accessories. Saudi Arabia LRC 6014676/OHS/U/EN/M/042

Tenaris Threading, machining and finishing of steel Onne (Tenaris Global Services Nigeria Ltd) Oil pipes and accessories, storage and other services and Gas Freezone Federal Lighter Terminal related. Onne/Port Harcourt - River State LRC 6014676/OHS/U/EN/M/043 Nigeria

Tenaris Coating of steel pipes and accessories, storage Onne Pipe Coating Centre (Pipe Coaters and other services related. Nigeria Ltd) LRC 6014676/OHS/U/EN/M/044 Oil and Gas Freezone Federal Lighter Terminal Onne/Port Harcourt - River State Nigeria Approval Certificate Original Approval: 22nd July 2017 No: LRC 6014676/OHS/U/EN/M Current Certificate: 17th December 2019

Certificate Expiry: 21st July 2020

Page 18 of 20

This document is subject to the provision below Via Cadorna, 69 20090 Vimodrone (MI) For and on behalf of 1 Trinity Park, Bickenhill Lane, Birmingham, B37 7ES, - United Kingdom. This approval is carried out in accordance with the LRQA assessment and certification procedures and monitored by LRQA. The use of the UKAS Accreditation Mark indicates Accreditation in respect of those activities covered by the Accreditation Certificate Number 001

Lloyd’s Register Group Limited, its affiliates and subsidiaries, including Lloyd’s Register Quality Assurance Limited (LRQA), and their respective officers, employees or agents are, individually and collectively, referred to in this clause as ‘Lloyd’s Register’. Lloyd’s Register assumes no responsibility and shall not be liable to any person for any loss, damage or expense caused by reliance on the information or advice in this document or howsoever provided, unless that person has signed a contract with the relevant Lloyd’s Register entity for the provision of this information or advice and in that case any responsibility or liability is exclusively on the terms and conditions set out in that contract

CERTIFICATE SCHEDULE

Tenaris S.A. Société Anonyme Holding 13, Rue Beaumont L-1219 Luxembourg R.C.S. Luxembourg B-85.203 Locations Activities

Tenaris NKKTubes (NKKTUBES) Manufacture of seamless steel hot rolled tubular 2-1 Ikegami-cho Kawasaki-ku, Kawasaki-shi, products. Kanagawa-ken, 210-0864 LRC 6014676/OHS/U/EN/M/045 Japan

Tenaris Global Services (Thailand) Ltd. Service Provision and supply of steel Tubular 15/21, Moo 2, Tambon Ching-Ko product and accessories. 90280 Amphur Singhanakhon,Songkhla LRC 6014676/OHS/U/EN/M/046 Thailand

Tenaris Threading of casing and tubing steel pipes, Machachi (Tenaris Ecuador S.A.) service provision and storage of tubular Panamericana Sur Km 16.2 y Camino a products and accessories. San Alfonso Via a Machachi LRC 6014676/OHS/U/EN/M/047 Machachi, Pichincha Ecuador Reception, Storage, Inspection and Dispatch of Tenaris Global Services Ecuador S.A Steel Tubes and Accessories Approval Certificate Original Approval: 22nd July 2017 No: LRC 6014676/OHS/U/EN/M Current Certificate: 17th December 2019

Certificate Expiry: 21st July 2020

Page 19 of 20

This document is subject to the provision below Via Cadorna, 69 20090 Vimodrone (MI) For and on behalf of 1 Trinity Park, Bickenhill Lane, Birmingham, B37 7ES, - United Kingdom. This approval is carried out in accordance with the LRQA assessment and certification procedures and monitored by LRQA. The use of the UKAS Accreditation Mark indicates Accreditation in respect of those activities covered by the Accreditation Certificate Number 001

Lloyd’s Register Group Limited, its affiliates and subsidiaries, including Lloyd’s Register Quality Assurance Limited (LRQA), and their respective officers, employees or agents are, individually and collectively, referred to in this clause as ‘Lloyd’s Register’. Lloyd’s Register assumes no responsibility and shall not be liable to any person for any loss, damage or expense caused by reliance on the information or advice in this document or howsoever provided, unless that person has signed a contract with the relevant Lloyd’s Register entity for the provision of this information or advice and in that case any responsibility or liability is exclusively on the terms and conditions set out in that contract

CERTIFICATE SCHEDULE

Tenaris S.A. Société Anonyme Holding 13, Rue Beaumont L-1219 Luxembourg R.C.S. Luxembourg B-85.203 Locations Activities Km 7 Via El Proyecto-Shushufindi LRC 6014676/OHS/U/EN/M/048 Parroquia 7 de Julio, Sucumbios Ecuador

Tenaris Threading of steel tubular products, service Aktau (Kazakhstan Pipe Threaders LLP) provision. 130000 Mangystau Region, Aktau LRC 6014676/OHS/U/EN/M/050 Industrial zone Subzone #3 Building ABK Kazakhstan

Approval Certificate Original Approval: 22nd July 2017 No: LRC 6014676/OHS/U/EN/M Current Certificate: 17th December 2019

Certificate Expiry: 21st July 2020

Page 20 of 20

This document is subject to the provision below Via Cadorna, 69 20090 Vimodrone (MI) For and on behalf of 1 Trinity Park, Bickenhill Lane, Birmingham, B37 7ES, - United Kingdom. This approval is carried out in accordance with the LRQA assessment and certification procedures and monitored by LRQA. The use of the UKAS Accreditation Mark indicates Accreditation in respect of those activities covered by the Accreditation Certificate Number 001

Lloyd’s Register Group Limited, its affiliates and subsidiaries, including Lloyd’s Register Quality Assurance Limited (LRQA), and their respective officers, employees or agents are, individually and collectively, referred to in this clause as ‘Lloyd’s Register’. Lloyd’s Register assumes no responsibility and shall not be liable to any person for any loss, damage or expense caused by reliance on the information or advice in this document or howsoever provided, unless that person has signed a contract with the relevant Lloyd’s Register entity for the provision of this information or advice and in that case any responsibility or liability is exclusively on the terms and conditions set out in that contract