Ranked by reported Q2 2026 13F market value
Share of total reported institutional value in TS held by the largest 10 / 25 filers.
| # | Institution | Shares Held | Market Value | QoQ Change | Ownership % | % of Fund |
|---|---|---|---|---|---|---|
| 1 | FMR LLC | 6.8M | $375.2M | -18.1% | 1.260% | 0.02% |
| 2 | RENAISSANCE TECHNOLOGIES LLC | 3.1M | $169.6M | -4.5% | 0.570% | 0.23% |
| 3 | VAN ECK ASSOCIATES CORP | 2.5M | $137.5M | -14.3% | 0.462% | 0.08% |
| 4 | WELLINGTON MANAGEMENT GROUP LLP | 2.5M | $136.4M | +2.2% | 0.458% | 0.02% |
| 5 | MORGAN STANLEY | 1.2M | $68.8M | +5.2% | 0.231% | 0.00% |
| 6 | GOLDMAN SACHS GROUP INC | 1.2M | $65.5M | +63.6% | 0.220% | 0.01% |
| 7 | Merewether Investment Management, LP | 1.1M | $62.7M | β | 0.211% | 1.18% |
| 8 | DIMENSIONAL FUND ADVISORS LP | 1.0M | $57.7M | -7.2% | 0.194% | 0.01% |
| 9 | Holocene Advisors, LP | 1.0M | $57.2M | β | 0.192% | 0.13% |
| 10 | DRIEHAUS CAPITAL MANAGEMENT LLC | 1.0M | $55.6M | +12.7% | 0.187% | 0.32% |
| 11 | CWA Asset Management Group, LLC | 987K | $54.8M | +78.2% | 0.184% | 1.67% |
| 12 | Invesco Ltd. | 902K | $50.0M | -22.9% | 0.168% | 0.00% |
| 13 | JANE STREET GROUP, LLC | 876K | $48.6M | +471.4% | 0.163% | 0.00% |
| 14 | BlackRock, Inc. | 748K | $41.5M | +4.4% | 0.139% | 0.00% |
| 15 | MARSHALL WACE, LLP | 704K | $39.1M | +8704.6% | 0.131% | 0.03% |
| 16 | MASSACHUSETTS FINANCIAL SERVICES CO /MA/ | 628K | $35.3M | -2.9% | 0.117% | 0.01% |
| 17 | MILLENNIUM MANAGEMENT LLC | 620K | $34.4M | +421.8% | 0.116% | 0.01% |
| 18 | UBS Group AG | 582K | $32.3M | +16.6% | 0.108% | 0.00% |
| 19 | Bridgewater Associates, LP | 568K | $31.5M | +1884.7% | 0.106% | 0.13% |
| 20 | ASSETMARK, INC | 561K | $31.1M | +14.3% | 0.104% | 0.05% |
| 21 | Aventail Capital Group, LP | 560K | $31.1M | +540.9% | 0.104% | 1.78% |
| 22 | Freestone Grove Partners LP | 504K | $28.0M | β | 0.094% | 0.18% |
| 23 | SUSQUEHANNA INTERNATIONAL GROUP, LLP | 481K | $26.7M | +157.7% | 0.090% | 0.00% |
| 24 | SIR Capital Management, L.P. | 369K | $20.5M | β | 0.069% | 2.35% |
| 25 | BANK OF AMERICA CORP /DE/ | 344K | $19.1M | +117.1% | 0.064% | 0.00% |
denotes a marquee investor (Buffett, Burry, ARK, Tiger Global, Pershing Square, Baupost and other widely-followed managers). β% of Fundβ shows how much of that investorβs total 13F portfolio is invested in TS β a direct measure of their conviction.
Filings activity in TS during Q2 2026, grouped by how each filer changed its position.
8 quarters of 13F filings Β· Ξ columns show change vs prior quarter
| Quarter | Inst. Holders | Ξ Holders | Ownership % | Ξ Ownership | Total 13F Value | Ξ Value |
|---|---|---|---|---|---|---|
| Q2 2026 | 286 | +7.9% | 7.30% | 0.13 pp | $2.08B | +0.8% |
| Q1 2026 | 265 | +17% | 7.43% | +1.26 pp | $2.06B | +82% |
| Q4 2025 | 226 | +3.2% | 6.17% | +0.90 pp | $1.13B | +27% |
| Q3 2025 | 219 | 1.4% | 5.27% | 1.90 pp | $889M | 31% |
| Q2 2025 | 222 | +0.5% | 7.17% | 0.34 pp | $1.29B | 8.2% |
| Q1 2025 | 221 | 4.7% | 7.51% | 0.13 pp | $1.41B | +4.1% |
| Q4 2024 | 232 | +18% | 7.64% | 14.37 pp | $1.35B | 64% |
| Q3 2024 | 197 | β | 22.01% | β | $3.75B | β |
Source: SEC 13F institutional filings. Ownership % requires market cap data and will show once linked. Ξ columns compare to the immediately prior filed quarter.
Quick answers to the most common questions about buying TS stock.
Based on Q2 2026 13F filings, institutional ownership of Tenaris S.A. stands at 7.3%, held across 286 reporting institutions.
FMR LLC is the largest reported institutional holder of TS, with approximately 6,760,952 shares worth $0.38B as of Q2 2026.
Yes β 5 widely-followed marquee investors appear among the top 25 institutional holders of TS, including RENAISSANCE TECHNOLOGIES LLC, JANE STREET GROUP, LLC, MILLENNIUM MANAGEMENT LLC, Bridgewater Associates, LP, SUSQUEHANNA INTERNATIONAL GROUP, LLP.
Our composite Smart Money Score for TS is 71 out of 100 (Bullish). It combines net institutional buying activity, ownership shift, marquee investor presence, and holder-count growth.
50 institutions opened new positions in TS during Q2 2026, while 30 fully exited. 74 added to existing positions and 151 trimmed.
TS institutional ownership fell by 0.13 percentage points quarter-over-quarter, with a net change of +21 holders.
The top 10 institutions account for 57.0% of all reported 13F value in TS, and the top 25 account for 82.2%.
All data is sourced from SEC Form 13F filings, which institutional investment managers with at least $100M in assets are required to file each quarter. We process every 13F filing from EDGAR and recompute the aggregates after each cycle. Insider transactions are sourced from Form 4 filings.
Tenaris S.A. (TS) Institutional Ownership