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Tenaris
TS

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.

New
Increased
Maintained
Reduced
Closed

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)

Holders
221
Holders Change
–
Holders Change %
0%
% of All Funds
2.9%
Holding in Top 10
4
Holding in Top 10 Change
+1
Holding in Top 10 Change %
+33.33%
% of All Funds
0.05%
New
37
Increased
82
Reduced
65
Closed
34
Calls
$5.22M
Puts
$4.97M
Net Calls
+$254K
Net Calls Change
+$4.13M

Top Buyers

Rank Fund Capital Flow
1
Optiver Holding
Optiver Holding
Netherlands
+$21.4M
2
Renaissance Technologies
Renaissance Technologies
New York
+$16.7M
3
D.E. Shaw & Co
D.E. Shaw & Co
New York
+$13.6M
4
AA
ABC Arbitrage
France
+$11.2M
5
Qube Research & Technologies (QRT)
Qube Research & Technologies (QRT)
United Kingdom
+$8.75M

Top Sellers

Rank Fund Capital Flow
1
SG
Sourcerock Group
Colorado
-$115M
2
Balyasny Asset Management
Balyasny Asset Management
Illinois
-$66.1M
3
Citadel Advisors
Citadel Advisors
Florida
-$62.1M
4
UBS Group
UBS Group
Switzerland
-$47.8M
5
Capstone Investment Advisors
Capstone Investment Advisors
New York
-$34.5M
Name Holding Trade Value Shares
Change 		Change in
Stake
UBS Group
26
UBS Group
Switzerland
$9.64M -$47.8M -1,315,354 -83%
TI
27
Trexquant Investment
Connecticut
$8.97M +$257K +7,073 +3%
Qube Research & Technologies (QRT)
28
Qube Research & Technologies (QRT)
United Kingdom
$8.62M +$8.75M +240,918 New
Northern Trust
29
Northern Trust
Illinois
$8.23M -$21.5K -592 -0.3%
TRCT
30
Tower Research Capital (TRC)
New York
$8.18M +$8.09M +222,852 +3,780%
Bank of America
31
Bank of America
North Carolina
$6.93M -$14.6M -401,825 -67%
Legal & General Group
32
Legal & General Group
United Kingdom
$6.77M -$641K -17,645 -9%
State Street
33
State Street
Massachusetts
$5.18M -$46.9K -1,291 -0.9%
EI
34
Ethic Inc
New York
$4.62M +$205K +5,636 +5%
Lazard Asset Management
35
Lazard Asset Management
New York
$4.45M -$870K -23,960 -16%
SAM
36
Silvercrest Asset Management
New York
$3.93M +$9.26K +255 +0.2%
QCM
37
Quantinno Capital Management
New York
$3.43M +$1.04M +28,714 +43%
Invesco
38
Invesco
Georgia
$3.18M +$710K +19,556 +28%
SSG
39
Summit Securities Group
New York
$3.1M +$925K +25,476 +42%
PC
40
Pureheart Capital
$3.08M +$3.12M +86,000 New
KK
41
KLP Kapitalforvaltning
Norway
$3.04M +$2M +55,000 +183%
YIH
42
Y-Intercept (HK)
Hong Kong
$3.03M +$2.84M +78,090 +1,184%
QT
43
Quantbot Technologies
New York
$2.72M +$1.72M +47,417 +166%
ACG
44
Aventail Capital Group
New York
$2.65M -$4.04M -111,314 -60%
AQR Capital Management
45
AQR Capital Management
Connecticut
$2.53M +$1.12M +30,951 +78%
Citigroup
46
Citigroup
New York
$2.41M +$647K +17,813 +36%
OSAM
47
O'Shaughnessy Asset Management
Connecticut
$2.37M -$389K -10,714 -14%
RL
48
Ruffer LLP
United Kingdom
$2.12M – – –
MNA
49
Manning & Napier Advisors
New York
$1.98M -$170K -4,675 -8%
CGH
50
Crossmark Global Holdings
Texas
$1.8M +$223K +6,143 +14%
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TS Hedge Fund Activity: Q3 2025 in Review

221 of the 7,619 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.