227 institutions reported holding $591.4M of Metallus Inc (TMST) in SEC 13F filings for 2026-03-31. Largest institutional holders: BlackRock, Inc. ($92.4M), STATE STREET CORP ($45.7M), DIMENSIONAL FUND ADVISORS LP ($41.6M), MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd. ($30.1M), AMERICAN CENTURY COMPANIES INC ($27.1M). Source: SEC Form 13F.
| Rank | Institution | Value | Shares | Change |
|---|---|---|---|---|
| 1 | BlackRock, Inc. | $92.4M | 5.7M | Trimmed |
| 2 | STATE STREET CORP | $45.7M | 2.8M | Added |
| 3 | DIMENSIONAL FUND ADVISORS LP | $41.6M | 2.5M | Trimmed |
| 4 | MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd. | $30.1M | 1.8M | Trimmed |
| 5 | AMERICAN CENTURY COMPANIES INC | $27.1M | 1.7M | Added |
| 6 | VANGUARD CAPITAL MANAGEMENT LLC | $25.5M | 1.6M | New |
| 7 | SYSTEMATIC FINANCIAL MANAGEMENT LP | $22.3M | 1.4M | Trimmed |
| 8 | VANGUARD PORTFOLIO MANAGEMENT LLC | $17.6M | 1.1M | New |
| 9 | DONALD SMITH & CO., INC. | $17.5M | 1.1M | Added |
| 10 | RENAISSANCE TECHNOLOGIES LLC | $16.7M | 1.0M | Trimmed |
| 11 | ROYCE & ASSOCIATES LP | $15.6M | 951,734 | Added |
| 12 | GEODE CAPITAL MANAGEMENT, LLC | $14.4M | 879,006 | Added |
| 13 | CHARLES SCHWAB INVESTMENT MANAGEMENT INC | $13.3M | 811,507 | Trimmed |
| 14 | AMERIPRISE FINANCIAL INC | $10.6M | 650,188 | Added |
| 15 | TWO SIGMA INVESTMENTS, LP | $9.0M | 550,873 | Added |
| 16 | OpenArc Corporate Advisory, LLC | $8.9M | 545,691 | Added |
| 17 | Azarias Capital Management, L.P. | $8.9M | 543,322 | Added |
| 18 | Invesco Ltd. | $8.0M | 492,106 | Trimmed |
| 19 | MORGAN STANLEY | $7.2M | 440,116 | Added |
| 20 | JANE STREET GROUP, LLC | $6.3M | 388,510 | New |
| 21 | NORTHERN TRUST CORP | $6.3M | 384,259 | Added |
| 22 | EMERALD ADVISERS, LLC | $6.1M | 376,134 | New |
| 23 | KENNEDY CAPITAL MANAGEMENT LLC | $5.5M | 339,324 | New |
| 24 | GOLDMAN SACHS GROUP INC | $5.4M | 330,286 | Added |
| 25 | Russell Investments Group, Ltd. | $5.3M | 326,368 | Added |
Source: SEC Form 13F filings · as of 2026-03-31