Estimated market cap $32.84BShares outstanding from the company’s latest SEC filing (all share classes, each priced at its own close; ADRs converted to ADS) × last close from Tiingo. Updated daily. This figure: shares as of Dec 31, 2025, last close Nov 13, 2026.536.00M ADSs, shares as of Dec 31, 2025CIK 1190723The SEC’s Central Index Key, the number it uses to identify every company and person that files.
Insider trades, 12 mo
—
No open-market trades
Congress trades, 24 mo
—
No disclosed trades
13F holders
…
Lobbying, 12 mo
—
No lobbying filings
Federal contracts, 12 mo
—
None matched
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Latest 10-Q
What changed in Tenaris S.A.'s latest quarterly report, compared with the one before.
We have not read a recent 10-Q for this company yet.
Insider trades
Open-market trades from Form 4. 10b5-1 marks a plan set in advance.Open-market buys and sales by officers, directors and 10% owners, from SEC Form 4. A plan set in advance is marked 10b5-1.
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13F holders
Funds that report this stock, checked against market prices.Fund managers with over $100 million in US-listed stocks file a 13F each quarter, up to 45 days after quarter end. Long positions only.
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Top 10 holders.Premium lists every holder, with CSV downloads.
Disclosed in dollar ranges, up to 45 days after the trade.Members of Congress, their spouses and dependent children report trades in dollar ranges, up to 45 days after the trade.
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Lobbying
What Tenaris S.A. and its lobbying firms report each quarter.A company that lobbies with its own staff reports its expenses; a lobbying firm it hires reports the income it received. We count both.
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Institutional ownership over time
How many funds reported holding the stock at the end of each quarter, and how many shares they held between them.
13F holders, Q3 2026Fund managers with over $100 million in US-listed stocks file a 13F each quarter, up to 45 days after quarter end. Long positions only.
193
50 added · 73 trimmed
Insider trades
Open-market trades from Form 4. 10b5-1 marks a plan set in advance.Open-market buys and sales by officers, directors and 10% owners, from SEC Form 4. A plan set in advance is marked 10b5-1.
No recent insider purchases or sales for this company.
13F holders
18.90M shares
193 funds report TS. Values checked against market prices.Fund managers with over $100 million in US-listed stocks file a 13F each quarter, up to 45 days after quarter end. Long positions only.
Funds own 7.2% of the company, counted in US-listed ADS (Q2 2026)Fund managers with more than $100 million in US-listed stocks file a 13F each quarter. It lists their long stock positions only (shorts, options and bonds are left out) and can arrive up to 45 days after the quarter ends, so this is a snapshot of the quarter end. We add up the shares every fund reports in this class and divide by the shares outstanding. The total can pass 100%: the same shares are often reported by more than one manager (an adviser and the fund it runs), lent shares can be reported twice, and the share count can be out of date after buybacks. We divided 38.39M reported ADSs by 536.00M ADSs, from the cover page of the company’s filing as of Dec 31, 2025. An ADS stands for a fixed number of the company’s ordinary shares, so the company’s shares are converted to ADSs. 13F covers only ADSs listed in the US. Shares held at home and by funds abroad are not in it, so this figure is lower than global institutional ownership figures.
284 funds hold the stock.
Q3 2026: 3.5% · 5,560 of ~8,900 funds reported so farFunds have 45 days after a quarter ends to file. This quarter’s reports are still arriving, so the figure only counts the funds that have filed so far and will usually rise.
Q2 20257.9%
Q3 20256.7%
Q4 20256.1%
Q1 20267.3%
Q2 20267.2%
Q3 2026 (so far)3.5%
Q3 2026. 30 new, 50 added to, 73 trimmed, 121 exited since Q2 2026.
Download CSVEvery fund that holds TS, not only these ten. A download holds at most 10,000 rows; narrow the filters to get a smaller slice.
Trades by members of Congress
Disclosed in dollar ranges, up to 45 days after the trade.Members of Congress, their spouses and dependent children report trades in dollar ranges, up to 45 days after the trade.
Recent congressional trades
How the stock has done since the trade date, measured against the S&P 500 over the same days. It describes the stock, not the trader's actual gain or loss.
What Tenaris S.A. and its lobbying firms report each quarter.A company that lobbies with its own staff reports its expenses; a lobbying firm it hires reports the income it received. We count both.
No recent lobbying filings for this company.
Institutional ownership over time
How many funds reported holding the stock at the end of each quarter, and how many shares they held between them.
Funds holding the stock
Shares they report
Funds holding the stock by quarter
Q2 2013
148
—
145.59M
$5.9B
Q3 2013
168
+20
146.91M
$6.9B
Q4 2013
164
-4
134.29M
$5.8B
Q1 2014
159
-5
123.22M
$5.5B
Q2 2014
152
-7
116.19M
$5.5B
Q3 2014
148
-4
116.13M
$5.3B
Q4 2014
140
-8
128.52M
$3.9B
Q1 2015
151
+11
122.39M
$3.4B
Q2 2015
138
-13
111.93M
$3.0B
Q3 2015
144
+6
118.60M
$2.7B
Q4 2015
135
-9
99.82M
$2.4B
Q1 2016
139
+4
92.94M
$2.3B
Q2 2016
154
+15
94.52M
$2.7B
Q3 2016
154
0
94.36M
$2.7B
Q4 2016
165
+11
103.41M
$3.7B
Q1 2017
187
+22
109.42M
$3.7B
Q2 2017
165
-22
94.40M
$2.9B
Q3 2017
169
+4
89.40M
$2.5B
Q4 2017
176
+7
76.27M
$2.4B
Q1 2018
185
+9
84.45M
$2.9B
Q2 2018
198
+13
83.51M
$3.0B
Q3 2018
177
-21
78.75M
$2.6B
Q4 2018
171
-6
85.65M
$1.9B
Q1 2019
160
-11
86.66M
$2.4B
Q2 2019
160
0
83.38M
$2.2B
Q3 2019
138
-22
83.60M
$1.8B
Q4 2019
143
+5
67.25M
$1.5B
Q1 2020
131
-12
70.07M
$844.4M
Q2 2020
131
0
73.02M
$944.6M
Q3 2020
119
-12
67.94M
$669.3M
Q4 2020
129
+10
63.07M
$1.0B
Q1 2021
127
-2
58.28M
$1.3B
Q2 2021
143
+16
54.53M
$1.2B
Q3 2021
130
-13
48.74M
$1.0B
Q4 2021
144
+14
50.09M
$1.0B
Q1 2022
182
+38
78.93M
$2.1B
Q2 2022
182
0
71.44M
$1.6B
Q3 2022
179
-3
71.88M
$1.7B
Q4 2022
218
+39
63.85M
$2.1B
Q1 2023
227
+9
69.50M
$1.8B
Q2 2023
201
-26
68.99M
$1.9B
Q3 2023
216
+15
61.35M
$1.9B
Q4 2023
222
+6
64.50M
$2.2B
Q1 2024
235
+13
59.58M
$2.3B
Q2 2024
224
-11
55.91M
$1.7B
Q3 2024
200
-24
50.96M
$1.6B
Q4 2024
233
+33
50.79M
$1.9B
Q1 2025
227
-6
51.77M
$2.0B
Q2 2025
224
-3
46.19M
$1.7B
Q3 2025
225
+1
35.71M
$1.3B
Q4 2025
231
+6
32.95M
$1.3B
Q1 2026
268
+37
39.34M
$2.3B
Q2 2026
285
+17
38.39M
$2.1B
Q3 2026
193
-92
18.90M
$1.0B
Each point is a quarter-end, from Q2 2013 to Q3 2026. A fund's 13F lists its long positions in US-listed securities as of the last day of the quarter and arrives up to 45 days later, so each point shows holdings at quarter-end, not on the day they were reported.
Common shares only; options and bonds are left out. When a fund amends a report, the amended version is the one counted.
The history follows the company's current CUSIP number (88031M109). If the company's shares were ever re-issued under a different CUSIP, the quarters before the change are not part of this series, so the first point (Q2 2013) can be later than the stock's first appearance in 13F reports.
Share counts are adjusted for stock splits; none took place between these quarters. Values are in dollars as reported at the time and are not adjusted.
A quarter appears once our daily update has built its summary. If a summary cannot be built, older reports are kept and the chart shows the quarters it has until the next update repairs it.