Tenaris S.A.
Tenaris S.A. (TS) Stock Ownership
Institutional vs insider vs public ownership from 13F and float data — top holders, activity, and insider trades below.
SEC 13F · FMP · TS · as of Sep 30, 2025
Ownership Breakdown
230
Institutional Holders
▲ 2 vs Q2
$1.28B
Total Inst. Value
▼ $429.14M vs Q2
536.56M
Shares Outstanding
freeFloat 93.93%
35.70M
13F Shares Held
▼ 10.14M vs Q2
Institutional ownership = 13F shares ÷ total outstanding. Insider % = 100 − free float. Public % = free float − institution %. Data: FMP /symbol-positions-summary + /shares-float + SEC EDGAR.
Top Institutional Holders
TS largest shareholders · institutional ownership
Q3 2025 · SEC 13F
Showing top 10 holders
| Holder | Shares | % Owned | Weight | Value | Reported | Change |
|---|---|---|---|---|---|---|
WESTWOOD GLOBAL INVESTMENTS, LLC steel works, blast furnaces & rolling mills (coke ovens) | 7.59M | 1.41% | 1.41% | $271.55B | Dec 18, 2025 | ▼ 239.7K |
RENAISSANCE TECHNOLOGIES LLC steel works, blast furnaces & rolling mills (coke ovens) | 3.35M | 62.22% | 62.22% | $119.85B | Nov 13, 2025 | ▲ 459.1K |
FMR LLC steel works, blast furnaces & rolling mills (coke ovens) | 2.30M | 42.62% | 42.62% | $82.10B | Nov 13, 2025 | ▼ 3.2K |
WELLINGTON MANAGEMENT GROUP LLP steel works, blast furnaces & rolling mills (coke ovens) | 2.14M | 39.67% | 39.67% | $76.40B | Nov 14, 2025 | ▲ 36.7K |
PRICE T ROWE ASSOCIATES INC /MD/ steel works, blast furnaces & rolling mills (coke ovens) | 1.79M | 33.19% | 33.19% | $63.94B | Nov 14, 2025 | ▲ 89.3K |
VAN ECK ASSOCIATES CORP steel works, blast furnaces & rolling mills (coke ovens) | 1.61M | 29.91% | 29.91% | $57.61B | Nov 13, 2025 | ▼ 5.1K |
ENCOMPASS CAPITAL ADVISORS LLC steel works, blast furnaces & rolling mills (coke ovens) | 1.43M | 26.61% | 26.61% | $51.25B | Nov 14, 2025 | ▼ 300.1K |
MORGAN STANLEY steel works, blast furnaces & rolling mills (coke ovens) | 1.17M | 21.76% | 21.76% | $41.91B | May 27, 2026 | ▲ 52.9K |
DIMENSIONAL FUND ADVISORS LP steel works, blast furnaces & rolling mills (coke ovens) | 1.13M | 21.06% | 21.06% | $40.57B | Nov 12, 2025 | ▲ 192.8K |
OPTIVER HOLDING B.V. steel works, blast furnaces & rolling mills (coke ovens) | 905.3K | 16.81% | 16.81% | $32.38B | Nov 10, 2025 | ▲ 589.6K |
Data from SEC Form 13F filings. Ownership bar normalised to largest holder. Change flags: isNew / isSoldOut / changeInSharesNumber (FMP extract-analytics/holder).
Institutional Activity
Q3 2025 vs prior quarter
Q3 2025
27
Increased
+2.87M shares2
New Positions
first time holders20
Decreased
−3.47M shares0
Sold Out
fully exitedNet shares change (top 50)
603.2K
+2.87M / −3.47M
Net new holders
+9
2 new / 0 exited
Based on top 50 institutional holders by position size. Fields: isNew, isSoldOut, changeInSharesNumber (FMP extract-analytics/holder, limit=50).
Insider Buying vs Selling
TS insider trading · insider activity
Source: SEC Form 4
Recent Insider Transactions
Showing 10 most recent · Common Stock only
No recent insider transactions reported.
Source: /insider-trading/search (FMP stable). Buy/Sell direction: acquisitionOrDisposition A=Buy, D=Sell. RSU vesting (M-Exempt) excluded from sentiment bar. All data from SEC EDGAR public filings.
About institutional & insider ownership
Tenaris S.A. (TS) is primarily owned by institutional investors, who hold approximately 6.7% of total shares outstanding. Company insiders own approximately 6.07%, while retail and public investors account for the remaining 87.28%.
The largest institutional shareholder of Tenaris S.A. is WESTWOOD GLOBAL INVESTMENTS, LLC, holding approximately 7.59 million shares — equal to 1.41% of outstanding shares — as of September 30, 2025.
A total of 230 institutional investors currently hold TS stock, with a combined institutional value of approximately $1.28 billion as of the most recent 13F filing period.
Frequently asked questions
TS ownershipTenaris S.A. (TS) is primarily owned by institutional investors, who hold approximately 6.7% of shares. The largest shareholder is WESTWOOD GLOBAL INVESTMENTS, LLC with a 1.41% stake. Company insiders hold 6.07%. Data sourced from SEC Form 13F as of September 30, 2025.