# EDGAR Filing Document

**Accession Number:** 0001190723
**File Stem:** 0001213900-26-014102
**Filing Date:** 2026-2
**Character Count:** 18263
**Document Hash:** 80f64bfee62c736ec85618c885d387d8
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001213900-26-014102.hdr.sgml**: 20260210

**ACCESSION NUMBER**: 0001213900-26-014102

**CONFORMED SUBMISSION TYPE**: SCHEDULE 13D/A

**PUBLIC DOCUMENT COUNT**: 1

**FILED AS OF DATE**: 20260210

**DATE AS OF CHANGE**: 20260210

**SUBJECT COMPANY**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** TENARIS SA
- **CENTRAL INDEX KEY:** 0001190723
- **STANDARD INDUSTRIAL CLASSIFICATION:** STEEL WORKS, BLAST FURNACES  ROLLING MILLS (COKE OVENS) [3312]
- **ORGANIZATION NAME:** 04 Manufacturing
- **EIN:** 000000000

**FILING VALUES:**
- **FORM TYPE:** SCHEDULE 13D/A
- **SEC ACT:** 1934 Act
- **SEC FILE NUMBER:** 005-78699
- **FILM NUMBER:** 26614908

**BUSINESS ADDRESS:**
- **STREET 1:** 26, BOULEVARD ROYAL, 4TH FLOOR
- **CITY:** LUXEMBOURG
- **STATE:** N4
- **ZIP:** L-2449
- **BUSINESS PHONE:** 1-888-300-5432

**MAIL ADDRESS:**
- **STREET 1:** 26, BOULEVARD ROYAL, 4TH FLOOR
- **CITY:** LUXEMBOURG
- **STATE:** N4
- **ZIP:** L-2449
**FILED BY**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** SAN FAUSTIN S.A.
- **CENTRAL INDEX KEY:** 0001429586

**ORGANIZATION NAME:**
- **EIN:** 000000000
- **STATE OF INCORPORATION:** N4
- **FISCAL YEAR END:** 1231

**FILING VALUES:**
- **FORM TYPE:** SCHEDULE 13D/A

**BUSINESS ADDRESS:**
- **STREET 1:** 26, BOULEVARD ROYAL, GROUND FLOOR
- **CITY:** LUXEMBOURG
- **STATE:** N4
- **ZIP:** L-2449
- **BUSINESS PHONE:** (352) 2720-9600

**MAIL ADDRESS:**
- **STREET 1:** 26, BOULEVARD ROYAL, GROUND FLOOR
- **CITY:** LUXEMBOURG
- **STATE:** N4
- **ZIP:** L-2449

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** San Faustin N.V.
- **DATE OF NAME CHANGE:** 20080312

### UNITED STATES SECURITIES AND EXCHANGE COMMISSION
**Washington, D.C. 20549**

## SCHEDULE 13D

### Under the Securities Exchange Act of 1934

**(Amendment No. 14)**

**TENARIS S.A.**

*(Name of Issuer)*

**Ordinary Shares, $1.00 par value per share**

*(Title of Class of Securities)*

**88031M109**

*(CUSIP Number)*

**Fernando J. Mantilla**<br>26, Boulevard Royal, Ground Floor<br>Grand-Duchy of Luxembourg N4 L-2449<br>352 27209600

*(Name, Address and Telephone Number of Person Authorized to Receive Notices and Communications)*

**02/06/2026**

*(Date of Event Which Requires Filing of this Statement)*

| **CUSIP No.** | **88031M109** |

---

| | | | |
|:--|:--|:--|:--|
| 1 | Name of reporting person<br>**ROCCA & PARTNERS STICHTING ADMINISTRATIEKANTOOR AANDELEN SAN FAUSTIN** | Name of reporting person<br>**ROCCA & PARTNERS STICHTING ADMINISTRATIEKANTOOR AANDELEN SAN FAUSTIN** | |
| 2 | Check the appropriate box if a member of a Group (See Instructions)<br>[x] (a)<br>[ ] (b) | Check the appropriate box if a member of a Group (See Instructions)<br>[x] (a)<br>[ ] (b) | |
| 3 | SEC use only | SEC use only | |
| 4 | Source of funds (See Instructions)<br>**OO** | Source of funds (See Instructions)<br>**OO** | |
| 5 | Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)<br>[ ] | Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)<br>[ ] | |
| 6 | Citizenship or place of organization<br>**P7** | Citizenship or place of organization<br>**P7** | |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 7 | Sole Voting Power<br>**0.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 8 | Shared Voting Power<br>**692085486.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 9 | Sole Dispositive Power<br>**0.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 10 | Shared Dispositive Power<br>**692085486.00** |
| 11 | Aggregate amount beneficially owned by each reporting person<br>**692085486.00** | Aggregate amount beneficially owned by each reporting person<br>**692085486.00** | |
| 12 | Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)<br>[ ] | Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)<br>[ ] | |
| 13 | Percent of class represented by amount in Row (11)<br>**68.6%** | Percent of class represented by amount in Row (11)<br>**68.6%** | |
| 14 | Type of Reporting Person (See Instructions)<br>**HC** | Type of Reporting Person (See Instructions)<br>**HC** | |

---

**Comment for Reporting Person:** Note to Row 4 (Source of funds): please refer to "Item 1 Comment" below.

Note to Row 13 (Percent of class represented by amount in Row (11)): The percent of class figures set forth in this Amendment No. 14 are calculated based on 1,071,994,930 issued Ordinary Shares (as defined below), of which 62,328,172 were held by Tenaris S.A. as treasury stock as of January 2, 2026, as published on the website of Tenaris S.A.

| **CUSIP No.** | **88031M109** |

---

| | | | |
|:--|:--|:--|:--|
| 1 | Name of reporting person<br>**SAN FAUSTIN S.A.** | Name of reporting person<br>**SAN FAUSTIN S.A.** | |
| 2 | Check the appropriate box if a member of a Group (See Instructions)<br>[x] (a)<br>[ ] (b) | Check the appropriate box if a member of a Group (See Instructions)<br>[x] (a)<br>[ ] (b) | |
| 3 | SEC use only | SEC use only | |
| 4 | Source of funds (See Instructions)<br>**OO** | Source of funds (See Instructions)<br>**OO** | |
| 5 | Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)<br>[ ] | Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)<br>[ ] | |
| 6 | Citizenship or place of organization<br>**N4** | Citizenship or place of organization<br>**N4** | |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 7 | Sole Voting Power<br>**0.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 8 | Shared Voting Power<br>**692085486.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 9 | Sole Dispositive Power<br>**0.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 10 | Shared Dispositive Power<br>**692085486.00** |
| 11 | Aggregate amount beneficially owned by each reporting person<br>**692085486.00** | Aggregate amount beneficially owned by each reporting person<br>**692085486.00** | |
| 12 | Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)<br>[ ] | Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)<br>[ ] | |
| 13 | Percent of class represented by amount in Row (11)<br>**68.6%** | Percent of class represented by amount in Row (11)<br>**68.6%** | |
| 14 | Type of Reporting Person (See Instructions)<br>**CO** | Type of Reporting Person (See Instructions)<br>**CO** | |

---

**Comment for Reporting Person:** Note to Row 4 (Source of funds): please refer to "Item 1 Comment" below.

Note to Row 13 (Percent of class represented by amount in Row (11)): The percent of class figures set forth in this Amendment No. 14 are calculated based on 1,071,994,930 issued Ordinary Shares (as defined below), of which 62,328,172 were held by Tenaris S.A. as treasury stock as of January 2, 2026, as published on the website of Tenaris S.A.

| **CUSIP No.** | **88031M109** |

---

| | | | |
|:--|:--|:--|:--|
| 1 | Name of reporting person<br>**TECHINT HOLDINGS S.A R.L.** | Name of reporting person<br>**TECHINT HOLDINGS S.A R.L.** | |
| 2 | Check the appropriate box if a member of a Group (See Instructions)<br>[x] (a)<br>[ ] (b) | Check the appropriate box if a member of a Group (See Instructions)<br>[x] (a)<br>[ ] (b) | |
| 3 | SEC use only | SEC use only | |
| 4 | Source of funds (See Instructions)<br>**OO** | Source of funds (See Instructions)<br>**OO** | |
| 5 | Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)<br>[ ] | Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)<br>[ ] | |
| 6 | Citizenship or place of organization<br>**N4** | Citizenship or place of organization<br>**N4** | |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 7 | Sole Voting Power<br>**692085486.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 8 | Shared Voting Power<br>**0.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 9 | Sole Dispositive Power<br>**692085486.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 10 | Shared Dispositive Power<br>**0.00** |
| 11 | Aggregate amount beneficially owned by each reporting person<br>**692085486.00** | Aggregate amount beneficially owned by each reporting person<br>**692085486.00** | |
| 12 | Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)<br>[ ] | Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)<br>[ ] | |
| 13 | Percent of class represented by amount in Row (11)<br>**68.6%** | Percent of class represented by amount in Row (11)<br>**68.6%** | |
| 14 | Type of Reporting Person (See Instructions)<br>**CO** | Type of Reporting Person (See Instructions)<br>**CO** | |

---

**Comment for Reporting Person:** Note to Row 4 (Source of funds): please refer to "Item 1 Comment" below.

Note to Row 13 (Percent of class represented by amount in Row (11)): The percent of class figures set forth in this Amendment No. 14 are calculated based on 1,071,994,930 issued Ordinary Shares (as defined below), of which 62,328,172 were held by Tenaris S.A. as treasury stock as of January 2, 2026, as published on the website of Tenaris S.A.

**Item 1. Security and Issuer**

**(a) Title of Class of Securities:**
Ordinary Shares, $1.00 par value per share

**(b) Name of Issuer:**
TENARIS S.A.

**(c) Address of Issuer's Principal Executive Offices:**
26, BOULEVARD ROYAL, 4TH FLOOR, LUXEMBOURG, N4, L-2449

This Amendment No. 14 amends and supplements the Schedule 13D originally filed on February 14, 2011 (this "Amendment No. 14"), as further amended by Amendments No. 1 to No. 13, on behalf of RP STAK, SAN FAUSTIN and TECHINT HOLDINGS (each as defined under Item 2 below) (collectively, the "Reporting Persons"), relating to the Ordinary Shares, par value $1 per share of Tenaris S.A. (the "Ordinary Shares"). This Amendment No. 14 reflects a net decrease by 1.11% of the percent of class represented by the Ordinary Shares held by such Reporting Persons, from 69.66% to 68.55%, as reported on Rows 13 of the cover pages of the Schedule 13D, as a result of the sale of a total of 18,919,701 Ordinary Shares by TECHINT HOLDINGS in the open market in the period from December 15, 2025 to February 6, 2026, under the non-discretionary accelerated share disposal agreement entered into by TECHINT HOLDINGS with an European financial institution reported in Item 4 of Amendment No. 13 to the Schedule 13D, which decrease was partially offset by the effect of the repurchase of a total of 11,065,751 Ordinary Shares made by Tenaris S.A. in the open market in the period from December 15, 2025 to January 2, 2026 under the second tranche of the share buyback program publicly announced on November 2, 2025. Except as specifically provided herein, this Amendment No. 14 does not modify any of the information previously reported on the Schedule 13D and its amendments.

This Schedule 13D is being jointly filed by each of the Reporting Persons pursuant to Rule 13d-1(k).

**Item 5. Interest in Securities of the Issuer**

**(a)**
RP STAK. See Items (7) through (11) and (13) on page 2
SAN FAUSTIN. See Items (7) through (11) and (13) on page 3
TECHINT HOLDINGS. See Items (7) through (11) and (13) on page 4

**(b)**
RP STAK. See Items (7) through (11) and (13) on page 2
SAN FAUSTIN. See Items (7) through (11) and (13) on page 3
TECHINT HOLDINGS. See Items (7) through (11) and (13) on page 4

**(c)**
In the period from December 15, 2025 to February 6, 2026, TECHINT HOLDINGS effected the following sales of Ordinary Shares pursuant to a non-discretionary accelerated share disposal agreement entered into with an European financial institution regulated in the European Union:

                                                                                                                Range of Prices
Trade Date      Number of Ordinary     Weighted Average      Min Daily price     Max Daily price
                             Shares Sold                Sale Price (+)              (USD) (+)                (USD) (+)
12/15/25                  340.000                      20,2440                      20,0741                  20,3327
12/16/25                  340.000                      19,9753                      19,7130                  20,1841
12/17/25                  358.884                      19,8353                      19,6871                  19,9919
12/18/25                  340.000                      19,5568                      19,1195                  19,8813
12/19/25                  340.000                      19,0721                      18,8622                  19,2370
12/22/25                  309.822                      19,1899                      19,0974                  19,2853
12/23/25                    30.585                      19,2886                      19,0815                  19,3998
12/29/25                    10.000                      19,2609                      19,1845                  19,3668
12/30/25                  150.000                      19,3747                      19,3403                  19,4226
01/02/26                  300.000                      19,3218                      19,1521                  19,3983
01/05/26                  695.000                      19,9610                      19,7063                  20,2254
01/06/26               1.247.563                      20,4786                      20,1829                  20,6570
01/07/26                    39.850                      19,9890                      19,9329                  20,1082
01/08/26                  666.433                      19,8369                      19,6841                  19,9292
01/09/26                  714.646                      20,1155                      19,8962                  20,4259
01/12/26                  663.268                      20,1900                      19,9758                  20,3207
01/13/26                  515.382                      20,5316                       20,1381                 20,8257
01/14/26                  762.119                      20,8836                       20,6980                 21,0708
01/15/26                  843.820                      21,0390                       20,8941                 21,1324
01/16/26                  292.584                      20,8172                       20,6202                 20,9048
01/19/26                  455.953                      20,8225                       20,7497                 20,8893
01/20/26                  480.933                      21,0436                       20,8289                 21,2101
01/21/26                  443.221                      21,7492                       21,4472                 21,9695
01/22/26                  893.668                      22,0625                       21,8668                 22,3526
01/23/26                  678.580                      22,4073                       22,1043                 22,6679
01/26/26                  856.644                      22,1810                       21,9617                 22,3819
01/27/26                  714.859                      22,2186                       22,0567                 22,3907
01/28/26                  801.346                      22,2761                       22,1519                 22,4093
01/29/26                  644.778                      22,6451                       22,2964                 22,9127
01/30/26                  697.655                      22,2488                       22,0859                 22,3481
02/02/26                  578.422                      22,0486                       21,5547                 22,2474
02/03/26                  692.610                      22,5759                       22,3098                 22,9293
02/04/26                  671.026                      23,1213                       22,9131                 23,3681
02/05/26                  645.913                      22,9515                       22,7347                 23,2303
02/06/26                  704.137                      23,0932                       22,8568                 23,2932

(+) For the purposes of this report, all euro prices were converted into U.S. dollars at the European Central Bank (ECB) reference exchange rate for the euro against the U.S. dollar (EUR/USD) for the relevant trade date, as reported in Bloomberg.

All sales reported above were made on a regulated stock market in the European Union.

During the period above referred, no other transactions in Ordinary Shares were effected by the Reporting Persons or, to the best of the Reporting Person's knowledge, any of the persons listed on Exhibit 99.1 to the Amendment No. 11 to the Schedule 13D of Tenaris S.A., filed on July 8, 2025.

### SIGNATURE

After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct.

**Reporting Person:** ROCCA & PARTNERS STICHTING ADMINISTRATIEKANTOOR AANDELEN SAN FAUSTIN

**Signature:** ROCCA & PARTNERS STICHTING ADMINISTRATIEKANTOOR AANDELEN SAN FAUSTIN

**Name/Title:** /s/ Fernando J. Mantilla / Attorney-in-fact

**Date:** 02/10/2026

After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct.

**Reporting Person:** SAN FAUSTIN S.A.

**Signature:** SAN FAUSTIN S.A.

**Name/Title:** /s/ Fernando J. Mantilla / Attorney-in-fact

**Date:** 02/10/2026

After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct.

**Reporting Person:** TECHINT HOLDINGS S.A R.L.

**Signature:** TECHINT HOLDINGS S.A R.L.

**Name/Title:** /s/ Fernando J. Mantilla / Attorney-in-fact

**Date:** 02/10/2026