Tenaris S. A. (TS)
NYSE: TS · Steel Works, Blast Furnaces & Rolling Mills (Coke Ovens) · Luxembourg, LU · filing with the SEC since 2002
Who owns Tenaris S. A.
As filed with the SECHolders of 5% or more
1
Rocca & Partners Stichting Administratiekantoor Aandelen San Faustin holds 68.6% of Ordinary Shares, $1.00 par value per share, as its SCHEDULE 13D/A filed Feb 10, 2026 says.
Directors and officers
0
report now, of 0 people on the record since . Their holdings as a group are not read here.
Institutions as a whole
n/a
The record does not read the share held by managers that file Form 13F, so none is printed and no split of the rest is estimated. What it holds is the 1 named at left.
Holders of 5% or moreshare of the class, as filed
Rocca & Partners Stichting Administratiekantoor Aandelen San Faustin
SCHEDULE 13D/A · filed Feb 10, 2026 · Ordinary Shares, $1.00 par value per share · 69.7% in Dec 17, 2025
What TS reports owning in othersstakes of 5% or more, and other ties
Other ties the annual report names
Techgen S.A.
An entity · co registrant · owns, named in the 20-F filed Mar 31, 2026
Techgen S.A.
An investee · associate, legal entity · invested in, named in the 20-F filed Mar 31, 2026
Ternium S.A.
An investee · associate · invested in, named in the 20-F filed Mar 31, 2026
Usiminas
An investee · associate · invested in, named in the 20-F filed Mar 31, 2026
24 subsidiaries in 16 countries, from the list filed with the 20-F filed Mar 31, 2026.
Insider tradesForm 4
0sales
0purchases
0sales on a scheduled plan
0people selling
$0sold, in dollars
$0bought, in dollars
Open-market trades on Form 4 from Sep 30, 2025 to Sep 30, 2026. A scheduled plan is a selling program set in advance under SEC rule 10b5-1. The trades are listed as filed and do not feed the grade.
By calendar yearSoldBought
No open-market trade is on the record for these years.
Dollars as filed, summed by the transaction date.
People who traded in the window
No one on the roster filed an open-market trade in the window.