Company · Ownership research

TENARIS SA TS

CIK 0001190723 · CUSIP 88031M109

Insider tradingInitial holdingsInstitutional holders

Quarter-end disclosures, not live holdings.

Several CUSIPs are reported for this company; this page shows CUSIP 88031M109 (TS), not CUSIP 88031M909 (TS), CUSIP 88031M959 (TS), CUSIP L90272136 (TNRSF), and does not merge CUSIPs.

This page lists the top 20 of 226 rows by value; the complete set is available through the API.

Some filings reported values in thousands; those figures were scaled ×1,000 to dollars.

Top 20 institutions

Weight means this stock's share of the manager's own portfolio.

By reported value

#	Manager	Value	Manager weight	Change vs prior	Source
01	Westwood Global Investments, LLC CIK 1356513 · Amended · View history	$292.89M 7,831,367 shares	15.80%	+158.61K(+2.10%)Added	SEC filing ↗ Aug 11, 2025	▾
02	Sourcerock Group LLC CIK 1822531 · View history	$115.42M 3,086,075 shares	6.02%	+635.82K(+25.90%)Added	SEC filing ↗ Aug 14, 2025	▾
03	RENAISSANCE TECHNOLOGIES LLC CIK 1037389 · View history	$108.14M 2,891,544 shares	0.14%	+188.70K(+7.00%)Added	SEC filing ↗ Aug 13, 2025	▾
04	FMR LLC CIK 315066 · View history	$85.96M 2,298,468 shares	0.00%	-26.01K(-1.10%)Reduced	SEC filing ↗ Aug 14, 2025	▾
05	WELLINGTON MANAGEMENT GROUP LLP CIK 902219 · View history	$78.51M 2,099,275 shares	0.01%	-227.84K(-9.80%)Reduced	SEC filing ↗ Aug 14, 2025	▾
06	Balyasny Asset Management L.P. CIK 1218710 · View history	$66.12M 1,767,924 shares	0.15%	+53.16K(+3.10%)Added	SEC filing ↗ Aug 14, 2025	▾
07	Encompass Capital Advisors LLC CIK 1541901 · View history	$64.81M 1,732,781 shares	2.61%	-364.76K(-17.40%)Reduced	SEC filing ↗ Aug 14, 2025	▾
08	CITADEL ADVISORS LLC CIK 1423053 · View history	$64.43M 1,722,807 shares	0.06%	-2.04M(-54.30%)Reduced	SEC filing ↗ Aug 14, 2025	▾
09	PRICE T ROWE ASSOCIATES INC /MD/ CIK 80255 · View history	$63.51M 1,697,997 shares	0.01%	-5.66K(-0.30%)Reduced	SEC filing ↗ Aug 14, 2025	▾
10	VAN ECK ASSOCIATES CORP CIK 869178 · View history	$60.43M 1,615,694 shares	0.07%	-202.21K(-11.10%)Reduced	SEC filing ↗ Aug 14, 2025	▾
11	UBS Group AG CIK 1610520 · View history	$59.27M 1,584,876 shares	0.01%	+498.77K(+45.90%)Added	SEC filing ↗ Aug 14, 2025	▾
12	MORGAN STANLEY CIK 895421 · View history	$41.84M 1,118,756 shares	0.00%	-712.55K(-38.90%)Reduced	SEC filing ↗ Aug 14, 2025	▾
13	DIMENSIONAL FUND ADVISORS LP CIK 354204 · View history	$35.21M 941,466 shares	0.01%	+366.65K(+63.80%)Added	SEC filing ↗ Aug 12, 2025	▾
14	GOLDMAN SACHS GROUP INC CIK 886982 · View history	$34.79M 930,231 shares	0.01%	-458.19K(-33.00%)Reduced	SEC filing ↗ Aug 14, 2025	▾
15	CAPSTONE INVESTMENT ADVISORS, LLC CIK 1426196 · View history	$34.47M 921,547 shares	0.29%	+370.67K(+67.30%)Added	SEC filing ↗ Aug 14, 2025	▾
16	MILLENNIUM MANAGEMENT LLC CIK 1273087 · View history	$29.06M 776,963 shares	0.03%	-400.30K(-34.00%)Reduced	SEC filing ↗ Aug 14, 2025	▾
17	MASSACHUSETTS FINANCIAL SERVICES CO /MA/ CIK 912938 · View history	$27.59M 737,760 shares	0.01%	-17.23K(-2.30%)Reduced	SEC filing ↗ Aug 8, 2025	▾
18	SIR Capital Management, L.P. CIK 1434997 · View history	$25.77M 688,935 shares	2.30%	+508.03K(+280.80%)Added	SEC filing ↗ Aug 12, 2025	▾
19	BlackRock, Inc. CIK 2012383 · View history	$23.45M 627,099 shares	0.00%	-30.07K(-4.60%)Reduced	SEC filing ↗ Aug 12, 2025	▾
20	BANK OF AMERICA CORP /DE/ CIK 70858 · View history	$22.28M 595,604 shares	0.00%	+191.86K(+47.50%)Added	SEC filing ↗ Aug 14, 2025	▾

Showing 20 / 226 institutions. The complete set is available through the API.

Coverage & totals by quarter

Reporting institutions

226

Cancelled or null records excluded

Disclosed shares

45,891,099

Not deduplicated across managers

Disclosed value

$1.71B

Not market cap or free float

Reporting institutions by quarter

Counts also change with data coverage and reporting entities; they do not measure net buying. Distinct managers with a live stock row in this CUSIP; totals may include overlapping filings and are not a share of the company.

TENARIS SA · Q2 2025

Explore all 226 reporting institutions.

This page includes 20 of 226 reporting institutions. Log in to look up the full history beyond 3 years, use advanced screening & filtering, download CSV, and get the complete set through the Akkru API.

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Sources, coverage & how to read this data

Figures are as reported to the SEC and merged with later amendments where Akkru could match them. Preview limits apply to what is listed, not to the totals, which come from the complete reported data. Nothing is zero-filled: a missing quarter or month is shown as missing.