| 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 | — | 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 | — | 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 | — | 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 | — | 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). “% of Fund” shows how much of that investor’s total 13F portfolio is invested in TS — a direct measure of their conviction.
| 7.51% |
| 0.13 pp |
| $1.41B |
| +4.1% |
| Q4 2024 | 232 | +18% | 7.64% | 14.37 pp | $1.35B | 64% |
| Q3 2024 | 197 | — | 22.01% | — | $3.75B | — |
Source: SEC 13F institutional filings. Ownership % requires market cap data and will show once linked. Δ columns compare to the immediately prior filed quarter.
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