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

13F Institutional Holders and Ownership History from Q1 2014 to Q4 2025

Type / Class: Equity / Ordinary Shares, $1.00 par value per share
Symbol: TS on NYSE
Shares outstanding: 1,020,093,525
Price per share: $38.45
All holders as of 30 Sep 2025: Q3 2025
Total 13F shares: 35,696,193
Total reported value: $1,276,901,690
% of total 13F portfolios: 0%
Share change: -10,208,304
Value change: -$370,468,957
Number of holders: 218

Reported Shares, Excluding Options vs Price

Reported Value, Excluding Options

Total Investors

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.	70%	+1.7%	$28,376,217,013	-$103,766,000	711,005,187	-0.36%	SAN FAUSTIN S.A.	12 Dec 2025

As of 30 Sep 2025, 218 institutional investors reported holding 35,696,193 shares of TENARIS SA - Ordinary Shares, $1.00 par value per share (TS). This represents 3.5% of the company’s total 1,020,093,525 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
2025 Q4	74,789	$2,891,514	+$274,041			$38.45	10
2025 Q3	35,696,193	$1,276,901,690	-$370,468,957	$3,666,425	$3,441,074	$35.77	218
2025 Q2	45,891,964	$1,708,084,599	-$183,845,182	$9,982,615	$6,657,200	$37.40	220
2025 Q1	43,076,013	$1,684,712,843	+$31,497,766	$8,639,326	$8,017,550	$39.11	221
2024 Q4	41,868,776	$1,582,115,750	-$53,452,192	$17,643,256	$7,081,846	$37.79	226
2024 Q3	49,962,994	$1,589,187,771	-$165,244,067	$16,330,732	$9,101,477	$31.79	195
2024 Q2	55,605,203	$1,697,134,148	-$47,439,109	$3,589,152	$5,862,892	$30.52	215
2024 Q1	55,811,995	$2,191,793,806	-$223,147,169	$4,402,167	$5,305,377	$39.27	231
2023 Q4	738,747	$25,692,646	+$16,135,646			$34.88	2
2023 Q3	59,555,450	$1,882,004,567	-$214,257,967	$3,741,440	$4,528,280	$31.60	204
2023 Q2	53,948,649	$1,615,783,439	+$118,537,242	$2,610,531	$3,321,455	$29.95	187
2023 Q1	52,698,133	$1,497,684,799	+$23,160,649	$3,279,668	$2,421,384	$28.42	213
2022 Q4	50,385,604	$1,771,661,640	-$9,445,850	$770,004	$2,355,720	$35.16	208
2022 Q3	51,403,710	$1,328,457,209	+$85,516,770	$555,000	$12,018,000	$25.84	168
2022 Q2	48,600,001	$1,248,654,232	-$223,635,785	$1,976,000	$5,068,000	$25.69	166
2022 Q1	57,416,421	$1,722,622,526	+$232,495,755	$2,472,000	$7,969,000	$30.07	167
2021 Q4	49,896,895	$1,040,924,293	+$25,484,839	$1,851,000	$1,282,000	$20.86	135
2021 Q3	48,664,991	$1,027,304,262	-$125,306,190	$6,769,000	$3,133,000	$21.11	125
2021 Q2	54,449,335	$1,192,265,107	-$81,972,240	$3,666,000	$3,213,000	$21.90	138
2021 Q1	58,195,178	$1,319,723,191	-$100,310,349	$2,969,000	$4,813,000	$22.69	121
2020 Q4	62,681,505	$999,788,969	-$24,030,940	$1,882,000	$1,605,000	$15.95	120
2020 Q3	65,585,382	$646,043,841	-$60,993,353	$461,000	$2,853,000	$9.85	108
2020 Q2	68,826,342	$890,296,377	+$7,735,272	$8,139,000	$6,367,000	$12.93	118
2020 Q1	67,473,843	$813,110,631	+$3,725,280	$2,654,000	$220,000	$12.05	111
2019 Q4	64,206,311	$1,453,577,144	-$342,099,384	$789,000	$63,000	$22.64	131
2019 Q3	82,262,837	$1,742,332,826	-$848,099	$5,129,000	$2,514,000	$21.18	131
2019 Q2	83,143,497	$2,187,371,915	-$13,979,395	$6,582,000	$1,513,000	$26.31	150
2019 Q1	82,453,349	$2,329,204,224	-$28,982,176	$9,198,000	$4,365,000	$28.25	149
2018 Q4	85,191,485	$1,841,234,077	+$88,848,612	$623,000	$3,117,000	$21.32	157
2018 Q3	78,348,284	$2,624,837,299	-$163,254,221	$5,791,000	$1,518,000	$33.52	169
2018 Q2	82,634,030	$3,007,066,765	-$49,868,604	$9,492,000	$11,969,000	$36.39	188
2018 Q1	83,734,196	$2,896,795,093	+$282,117,848	$6,549,000	$2,934,000	$34.67	176
2017 Q4	75,420,886	$2,402,708,341	-$408,092,075	$1,087,000	$2,144,000	$31.86	167
2017 Q3	89,370,939	$2,530,186,331	-$8,451,881	$8,462,000	$2,848,000	$28.31	160
2017 Q2	93,381,640	$2,908,086,240	-$555,554,275	$10,692,000	$1,575,000	$31.14	158
2017 Q1	109,241,298	$3,727,119,954	+$152,302,238	$1,704,000	$42,754,000	$34.14	181
2016 Q4	103,280,522	$3,688,415,724	+$336,390,771	$1,075,000	$7,464,000	$35.71	160
2016 Q3	94,345,383	$2,678,939,667	+$2,816,842	$9,664,000	$1,503,000	$28.40	150
2016 Q2	94,469,925	$2,724,158,936	+$56,271,793	$3,497,000	$3,933,000	$28.84	148
2016 Q1	92,891,680	$2,299,972,366	-$170,054,330	$3,455,000	$2,896,000	$24.76	134
2015 Q4	99,434,293	$2,435,060,816	-$126,671,004	$1,062,000	$1,702,000	$23.80	128
2015 Q3	105,327,841	$2,552,838,264	+$189,684,015	$1,999,000	$6,961,000	$24.11	134
2015 Q2	111,676,150	$3,015,932,861	-$290,559,443	$7,011,000	$6,579,000	$27.02	131
2015 Q1	122,377,819	$3,427,547,258	-$179,850,413	$5,729,000	$1,709,000	$28.00	146
2014 Q4	128,505,380	$3,882,374,158	+$90,954,944	$27,991,000	$4,191,000	$30.21	136
2014 Q3	116,115,604	$5,289,058,305	+$120,668,869	$6,623,000	$22,302,000	$45.55	143
2014 Q2	109,580,380	$5,167,582,708	-$443,668,287	$8,770,000	$20,959,000	$47.15	149
2014 Q1	120,502,995	$5,330,074,386	-$333,652,592	$15,138,000	$21,793,000	$44.25	151