What is CUSIP 88031M109?

CUSIP 88031M109 is the security identifier used in SEC filing datasets for TS - TENARIS SA - Ordinary Shares, $1.00 par value per share.

Who owns TS - TENARIS SA - Ordinary Shares, $1.00 par value per share based on 13F filings?

260 institutions reported positions in TS - TENARIS SA - Ordinary Shares, $1.00 par value per share as of Q1 2026. Open the latest holders period and ownership history tables on this page for position-level details.

Security Snapshot

TENARIS SA - Ordinary Shares, $1.00 par value per share (TS) Institutional Ownership

CUSIP: 88031M109

13F Institutional Holders and Ownership History from Q1 2014 to Q1 2026

Latest Period

Q1 2026

Institutions Reporting

260

Shares (Excl. Options)

39,323,077

Price

$58.18

Save this security page for your next review

Keep this CUSIP in your watchlists so you can revisit quarter changes from one place. If you create an account from here, we will bring you back after verification.

Create free account and return here Sign in and return here Review latest holder period

Type / Class: Equity / Ordinary Shares, $1.00 par value per share
Symbol: TS on NYSE
Shares outstanding: 1,008,870,971
Price per share: $63.15
All holders as of 31 Mar 2026: Q1 2026
Total 13F shares: 39,323,077
Total reported value: $2,288,191,499
% of total 13F portfolios: 0%
Share change: +6,424,734
Value change: +$415,301,829
Number of holders: 260

Reported Shares, Excluding Options vs Price

Reported Value, Excluding Options

Total Investors

Key facts

TS - TENARIS SA - Ordinary Shares, $1.00 par value per share is tracked under CUSIP 88031M109.
260 institutions reported positions in Q1 2026.
1 significant owner is listed from Schedule 13D/13G reporting.

Change

Holder count moved from 228 to 260 between Q4 2025 and Q1 2026.
Reported value moved from $1,266,134,331 to $2,288,191,499.

Research use

You can quickly see who holds this security, then open quarter and manager detail pages for full evidence.
13F and Schedule 13D/13G sections are kept together so you can cross-check institutional and beneficial ownership context.

Evidence

Source: SEC Form 13F

Latest holder context comes from 260 institutions filings for Q1 2026.

Open SEC Evidence

Security key

88031M109

Latest holder period

Q1 2026

13F holders

260

13D/G owners

CIK / CUSIP context first

Open Q1 2026 holders TS full holder history TENARIS SA SEC filings TENARIS SA company facts

Broader feeds

Latest 13F filings Latest 13D/G filings All securities

Recent Quarterly Holder Reports

Open recent reporting periods for CUSIP 88031M109:

Q1 2026 (260 holders) Q4 2025 (228 holders) Q3 2025 (220 holders) Q2 2025 (220 holders) Q1 2025 (222 holders) Q4 2024 (228 holders) Q3 2024 (194 holders) Q2 2024 (217 holders) Q1 2024 (231 holders) Q4 2023 (218 holders)

Significant Owners of TENARIS SA - Ordinary Shares, $1.00 par value per share (TS) based on Schedule 13D/G filings

Filer	Ownership	Change %	Holdings Value	Net Change	Nb Shares	Change %	Reporting Name	Report Period
SAN FAUSTIN S.A.	69%	-1.6%	$27,655,736,021	-$756,031,252	692,085,486	-2.7%	SAN FAUSTIN S.A.	06 Feb 2026

As of 31 Mar 2026, 260 institutional investors reported holding 39,323,077 shares of TENARIS SA - Ordinary Shares, $1.00 par value per share (TS). This represents 3.9% of the company’s total 1,008,870,971 outstanding shares.

Institutional Holders of TENARIS SA - Ordinary Shares, $1.00 par value per share (TS) across Reporting Periods

Period	Reported Shares, Excl. Options	Value, Excl. Options	Value Change	Puts Notional Value	Calls Notional Value	Price (Median)	Investors
2026 Q1	39,323,077	$2,288,191,499	+$415,301,829	$8,686,274	$25,802,830	$58.18	260
2025 Q4	32,927,032	$1,266,134,331	-$94,338,372	$4,729,350	$2,737,640	$38.45	228
2025 Q3	35,694,308	$1,276,834,263	-$370,497,729	$3,666,425	$3,441,074	$35.77	220
2025 Q2	45,891,964	$1,708,084,599	-$183,845,232	$9,982,615	$6,657,200	$37.40	220
2025 Q1	50,748,772	$1,984,794,448	+$22,057,160	$8,639,326	$8,017,550	$39.11	222
2024 Q4	49,785,304	$1,881,283,894	-$53,363,075	$17,643,256	$7,081,846	$37.79	228
2024 Q3	49,963,013	$1,589,188,375	-$165,633,083	$16,330,732	$9,101,477	$31.79	194
2024 Q2	55,617,977	$1,697,523,741	-$47,445,506	$3,589,152	$5,862,892	$30.52	217
2024 Q1	55,824,978	$2,192,303,496	-$226,942,299	$4,402,167	$5,305,377	$39.27	231
2023 Q4	62,225,265	$2,162,905,063	+$43,050,602	$2,200,308	$1,793,616	$34.76	218
2023 Q3	61,353,143	$1,938,840,255	-$235,526,632	$3,741,440	$4,528,280	$31.60	213
2023 Q2	68,887,694	$1,932,776,186	+$356,543,526	$2,610,531	$3,321,455	$29.95	195
2023 Q1	52,881,632	$1,502,899,424	+$22,869,602	$3,279,668	$2,421,384	$28.42	219
2022 Q4	50,549,126	$1,777,398,368	-$723,380,433	$770,004	$2,355,720	$35.16	214
2022 Q3	71,778,650	$1,657,488,823	+$403,842,075	$555,000	$12,018,000	$25.84	174
2022 Q2	48,838,496	$1,254,803,520	-$228,996,255	$1,976,000	$5,068,000	$25.69	174
2022 Q1	57,590,730	$1,727,768,479	+$235,300,826	$2,472,000	$7,969,000	$30.07	174
2021 Q4	49,985,524	$1,042,782,873	+$25,503,117	$1,851,000	$1,282,000	$20.86	140
2021 Q3	48,724,861	$1,028,543,854	-$125,301,335	$6,769,000	$3,130,000	$21.11	127
2021 Q2	54,512,016	$1,193,625,802	-$81,368,027	$3,666,000	$3,213,000	$21.90	141
2021 Q1	58,157,561	$1,319,534,126	-$98,063,929	$2,969,000	$5,777,000	$22.69	123
2020 Q4	63,004,116	$1,004,935,719	-$24,546,133	$1,882,000	$1,605,000	$15.95	124
2020 Q3	65,637,514	$646,559,838	-$61,139,682	$461,000	$2,853,000	$9.85	113
2020 Q2	70,930,500	$917,503,476	+$15,951,457	$8,139,000	$6,367,000	$12.93	123
2020 Q1	70,060,797	$844,282,655	-$255,155	$2,593,000	$220,000	$12.05	121
2019 Q4	67,112,045	$1,519,362,461	-$349,710,273	$785,000	$63,000	$22.64	137
2019 Q3	83,508,520	$1,768,713,826	-$16,440,557	$5,129,000	$2,514,000	$21.18	135
2019 Q2	83,182,188	$2,188,396,915	-$75,682,919	$6,582,000	$1,513,000	$26.31	157
2019 Q1	85,222,944	$2,407,455,224	+$9,076,279	$9,198,000	$4,365,000	$28.25	157
2018 Q4	85,588,178	$1,849,830,077	+$88,055,500	$623,000	$3,117,000	$21.32	162
2018 Q3	78,395,927	$2,626,286,299	-$163,215,752	$5,791,000	$1,518,000	$33.52	173
2018 Q2	82,896,228	$3,016,603,765	-$45,850,745	$9,492,000	$11,969,000	$36.39	192
2018 Q1	84,455,962	$2,921,811,093	+$283,647,136	$6,543,000	$2,933,000	$34.67	182
2017 Q4	76,264,068	$2,429,565,341	-$415,381,809	$1,087,000	$2,144,000	$31.86	173
2017 Q3	89,375,030	$2,530,293,331	-$165,706	$8,462,000	$2,848,000	$28.31	163
2017 Q2	94,370,427	$2,938,872,354	-$505,595,926	$10,713,000	$1,575,000	$31.14	161
2017 Q1	109,243,989	$3,727,258,315	+$152,297,585	$1,704,000	$42,754,000	$34.14	183
2016 Q4	103,283,351	$3,688,509,866	+$336,399,608	$1,081,000	$7,464,000	$35.71	162
2016 Q3	94,348,145	$2,679,015,667	+$514,622	$9,701,000	$1,524,000	$28.40	152
2016 Q2	94,519,725	$2,725,592,936	+$56,290,266	$3,511,000	$3,978,000	$28.84	152
2016 Q1	92,909,891	$2,300,422,366	-$171,333,754	$2,884,000	$2,896,000	$24.76	136
2015 Q4	99,814,267	$2,444,101,816	-$170,922,289	$1,062,000	$1,702,000	$23.80	131
2015 Q3	106,143,117	$2,574,639,264	+$181,671,222	$1,999,000	$6,961,000	$24.11	138
2015 Q2	111,927,039	$3,022,710,861	-$291,317,700	$7,011,000	$6,579,000	$27.02	133
2015 Q1	122,377,819	$3,427,547,258	-$179,612,879	$5,729,000	$1,709,000	$28.00	146
2014 Q4	128,506,157	$3,882,397,158	+$92,265,834	$27,991,000	$4,065,000	$30.21	137
2014 Q3	116,115,604	$5,289,058,305	+$120,672,273	$6,623,000	$22,302,000	$45.55	143
2014 Q2	113,407,297	$5,347,266,336	-$450,378,328	$8,770,000	$20,959,000	$47.15	150
2014 Q1	123,209,813	$5,449,844,386	-$357,077,551	$15,136,000	$21,790,000	$44.25	156