Ranked by reported Q1 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 | 8.3M | $480.1M | +275.3% | 1.538% | 0.03% |
| 2 | Westwood Global Investments, LLC | 6.7M | $388.3M | -8.2% | 1.244% | 14.47% |
| 3 | RENAISSANCE TECHNOLOGIES LLC | 3.2M | $186.2M | +7.9% | 0.596% | 0.29% |
| 4 | WELLINGTON MANAGEMENT GROUP LLP | 2.4M | $139.9M | -10.3% | 0.448% | 0.03% |
| 5 | MORGAN STANLEY | 1.2M | $68.5M | +0.7% | 0.220% | 0.00% |
| 6 | Invesco Ltd. | 1.2M | $68.0M | +113.9% | 0.218% | 0.01% |
| 7 | DIMENSIONAL FUND ADVISORS LP | 1.1M | $65.2M | -9.2% | 0.209% | 0.01% |
| 8 | DRIEHAUS CAPITAL MANAGEMENT LLC | 888K | $51.7M | β | 0.166% | 0.38% |
| 9 | GOLDMAN SACHS GROUP INC | 721K | $41.9M | -12.0% | 0.134% | 0.00% |
| 10 | BlackRock, Inc. | 716K | $41.6M | +2.8% | 0.133% | 0.00% |
| 11 | MASSACHUSETTS FINANCIAL SERVICES CO /MA/ | 647K | $38.1M | -1.5% | 0.121% | 0.01% |
| 12 | CWA Asset Management Group, LLC | 554K | $32.2M | β | 0.103% | 1.30% |
| 13 | UBS Group AG | 499K | $29.0M | +124.0% | 0.093% | 0.00% |
| 14 | ASSETMARK, INC | 491K | $28.6M | -2.6% | 0.091% | 0.06% |
| 15 | CITADEL ADVISORS LLC | 363K | $21.1M | -64.0% | 0.068% | 0.01% |
| 16 | Grantham, Mayo, Van Otterloo & Co. LLC | 348K | $20.2M | +4.6% | 0.065% | 0.05% |
| 17 | Carrhae Capital LLP | 337K | $19.6M | β | 0.063% | 1.31% |
| 18 | HARDING LOEVNER LP | 293K | $17.0M | -5.9% | 0.055% | 0.18% |
| 19 | Medina Value Partners, LLC | 253K | $14.7M | -54.9% | 0.047% | 3.09% |
| 20 | Capital Wealth Planning, LLC | 241K | $14.0M | β | 0.045% | 0.08% |
| 21 | NORTHERN TRUST CORP | 218K | $12.7M | -3.2% | 0.041% | 0.00% |
| 22 | Kiltearn Partners LLP | 205K | $11.9M | -17.7% | 0.038% | 3.21% |
| 23 | STATE STREET CORP | 203K | $11.8M | +1.3% | 0.038% | 0.00% |
| 24 | SUSQUEHANNA INTERNATIONAL GROUP, LLP | 187K | $10.9M | +176.0% | 0.035% | 0.00% |
| 25 | Connor, Clark & Lunn Investment Management Ltd. | 178K | $10.4M | β | 0.033% | 0.02% |
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 Q1 2026, grouped by how each filer changed its position.
Institutions that opened a new TS position in Q1 2026
Institutions that fully closed their TS position in Q1 2026
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 |
|---|---|---|---|---|---|---|
| Q1 2026 | 254 | +14% | 6.02% | +2.68 pp | $2.03B | +80% |
| Q4 2025 | 223 | +3.2% | 3.34% | +0.72 pp | $1.13B | +27% |
| Q3 2025 | 216 | 2.7% | 2.62% | 1.21 pp | $886M | 32% |
| Q2 2025 | 222 | +0.5% | 3.83% | 0.35 pp | $1.29B | 8.2% |
| Q1 2025 | 221 | 4.7% | 4.18% | +0.17 pp | $1.41B | +4.1% |
| Q4 2024 | 232 | +18% | 4.01% | 7.11 pp | $1.35B | 64% |
| Q3 2024 | 197 | 9.6% | 11.12% | +6.73 pp | $3.75B | +153% |
| Q2 2024 | 218 | β | 4.39% | β | $1.48B | 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 Q1 2026 13F filings, institutional ownership of Tenaris S.A. stands at 6.0%, held across 254 reporting institutions.
FMR LLC is the largest reported institutional holder of TS, with approximately 8,251,759 shares worth $0.48B as of Q1 2026.
Yes β 3 widely-followed marquee investors appear among the top 25 institutional holders of TS, including RENAISSANCE TECHNOLOGIES LLC, CITADEL ADVISORS LLC, SUSQUEHANNA INTERNATIONAL GROUP, LLP.
Our composite Smart Money Score for TS is 79 out of 100 (Bullish). It combines net institutional buying activity, ownership shift, marquee investor presence, and holder-count growth.
71 institutions opened new positions in TS during Q1 2026, while 40 fully exited. 166 added to existing positions and 16 trimmed.
TS institutional ownership rose by 2.68 percentage points quarter-over-quarter, with a net change of +31 holders.
The top 10 institutions account for 75.3% of all reported 13F value in TS, and the top 25 account for 89.7%.
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