Tenaris
221 hedge funds and large institutions have $1.28B invested in Tenaris in 2025 Q3 according to their latest regulatory filings, with 37 funds opening new positions, 82 increasing their positions, 65 reducing their positions, and 34 closing their positions.
33% more funds holding in top 10
Funds holding in top 10: 3 → 4 (+1)
26% more repeat investments, than reductions
Existing positions increased: 82 | Existing positions reduced: 65
9% more first-time investments, than exits
New positions opened: 37 | Existing positions closed: 34
5% more call options, than puts
Call options by funds: $5.22M | Put options by funds: $4.97M
0% more funds holding
Funds holding: 221 → 221 (0)
1.75% less ownership
Funds ownership: 7.89% → 6.14% (-1.8%)
25% less capital invested
Capital invested by funds: $1.71B → $1.28B (-$431M)
Top Buyers
| Rank | Fund | Capital Flow |
|---|---|---|
| 1 |
Optiver Holding
Amsterdam,
Netherlands
|
+$21.4M |
| 2 |
Renaissance Technologies
New York
|
+$16.7M |
| 3 |
D.E. Shaw & Co
New York
|
+$13.6M |
| 4 |
AA
ABC Arbitrage
Paris,
France
|
+$11.2M |
| 5 |
Qube Research & Technologies (QRT)
London,
United Kingdom
|
+$8.75M |
Top Sellers
| Rank | Fund | Capital Flow |
|---|---|---|
| 1 |
SG
Sourcerock Group
Denver,
Colorado
|
-$115M |
| 2 |
Balyasny Asset Management
Chicago,
Illinois
|
-$66.1M |
| 3 |
Citadel Advisors
Miami,
Florida
|
-$62.1M |
| 4 |
UBS Group
Zurich,
Switzerland
|
-$47.8M |
| 5 |
Capstone Investment Advisors
New York
|
-$34.5M |
TS Hedge Fund Activity: Q3 2025 in Review
221 of the 7,620 institutional investors tracked by Wall St. Rank reported a position in Tenaris (TS) for Q3 2025, worth a combined $1.28B — down 25% from $1.71B a quarter earlier.
Buyers outnumbered sellers: 37 funds opened new TS positions and 34 closed out — a net gain of 3 holders — while 82 added to existing stakes and 65 trimmed.
The largest buyer was Optiver Holding, adding an estimated $21.4M. The largest seller was Sourcerock Group, exiting entirely with an estimated $115M sold.
- 221 institutional investors held Tenaris (TS) as of Q3 2025, unchanged from Q2 2025.
- Funds reported $1.28B of Tenaris stock for Q3 2025, down 25% quarter-over-quarter.
- 37 funds opened new Tenaris positions in Q3 2025 and 34 closed out, a net change of +3 holders.
- The largest Tenaris buyer in Q3 2025 was Optiver Holding, an estimated $21.4M added.
- The largest Tenaris seller in Q3 2025 was Sourcerock Group, an estimated $115M sold.
Based on aggregated 13F filings for Q3 2025.