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 229 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	$300.08M 7,672,759 shares	18.56%	-241.39K(-3.10%)Reduced	SEC filing ↗ May 13, 2025	▾
02	CITADEL ADVISORS LLC CIK 1423053 · View history	$147.30M 3,766,310 shares	0.14%	+1.69M(+81.30%)Added	SEC filing ↗ May 15, 2025	▾
03	RENAISSANCE TECHNOLOGIES LLC CIK 1037389 · View history	$105.71M 2,702,844 shares	0.16%	+183.90K(+7.30%)Added	SEC filing ↗ May 14, 2025	▾
04	Sourcerock Group LLC CIK 1822531 · View history	$95.83M 2,450,258 shares	5.40%	+356.64K(+17.00%)Added	SEC filing ↗ May 15, 2025	▾
05	Alua Capital Management LP CIK 1827442 · View history	$93.37M 2,387,363 shares	7.60%	+2.39MNew	SEC filing ↗ May 15, 2025	▾
06	WELLINGTON MANAGEMENT GROUP LLP CIK 902219 · View history	$91.01M 2,327,117 shares	0.02%	-4.14K(-0.20%)Reduced	SEC filing ↗ May 13, 2025	▾
07	FMR LLC CIK 315066 · View history	$90.91M 2,324,478 shares	0.01%	-409.10K(-15.00%)Reduced	SEC filing ↗ May 12, 2025	▾
08	Encompass Capital Advisors LLC CIK 1541901 · View history	$82.03M 2,097,540 shares	3.15%	+997.54K(+90.70%)Added	SEC filing ↗ May 15, 2025	▾
09	MORGAN STANLEY CIK 895421 · View history	$71.62M 1,831,306 shares	0.01%	+432.81K(+30.90%)Added	SEC filing ↗ May 15, 2025	▾
10	VAN ECK ASSOCIATES CORP CIK 869178 · View history	$71.10M 1,817,899 shares	0.09%	-493.14K(-21.30%)Reduced	SEC filing ↗ May 15, 2025	▾
11	Balyasny Asset Management L.P. CIK 1218710 · View history	$67.06M 1,714,769 shares	0.17%	+22.33K(+1.30%)Added	SEC filing ↗ May 15, 2025	▾
12	PRICE T ROWE ASSOCIATES INC /MD/ CIK 80255 · View history	$66.63M 1,703,658 shares	0.01%	-171.67K(-9.20%)Reduced	SEC filing ↗ May 14, 2025	▾
13	GOLDMAN SACHS GROUP INC CIK 886982 · Amended · View history	$54.30M 1,388,426 shares	0.01%	-322.36K(-18.80%)Reduced	SEC filing ↗ May 16, 2025	▾
14	Merewether Investment Management, LP CIK 1736852 · View history	$50.60M 1,293,733 shares	1.84%	+757.32K(+141.20%)Added	SEC filing ↗ May 15, 2025	▾
15	Holocene Advisors, LP CIK 1700574 · View history	$46.90M 1,199,061 shares	0.14%	+904.71K(+307.40%)Added	SEC filing ↗ May 15, 2025	▾
16	MILLENNIUM MANAGEMENT LLC CIK 1273087 · View history	$46.04M 1,177,259 shares	0.04%	-1.64M(-58.20%)Reduced	SEC filing ↗ May 15, 2025	▾
17	UBS Group AG CIK 1610520 · View history	$42.48M 1,086,106 shares	0.01%	+787.04K(+263.20%)Added	SEC filing ↗ May 13, 2025	▾
18	MASSACHUSETTS FINANCIAL SERVICES CO /MA/ CIK 912938 · View history	$29.53M 754,994 shares	0.01%	+241.29K(+47.00%)Added	SEC filing ↗ May 2, 2025	▾
19	BNP PARIBAS FINANCIAL MARKETS CIK 1166588 · View history	$26.71M 683,067 shares	0.02%	+376.92K(+123.10%)Added	SEC filing ↗ May 14, 2025	▾
20	BlackRock, Inc. CIK 2012383 · View history	$25.70M 657,168 shares	0.00%	-10.79K(-1.60%)Reduced	SEC filing ↗ May 2, 2025	▾

Showing 20 / 229 institutions. The complete set is available through the API.

Coverage & totals by quarter

Reporting institutions

229

Cancelled or null records excluded

Disclosed shares

51,768,180

Not deduplicated across managers

Disclosed value

$2.01B

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 · Q1 2025

Explore all 229 reporting institutions.

This page includes 20 of 229 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.