TMST — Metallus Inc Institutional Holders · Q2 2026
Who owns Metallus Inc (TMST)? 2 institutions reported holding $78,498 in SEC 13F filings for Q2 2026 (period ended 2026-06-30). Largest holders: Simplex Trading, LLC ($78,498), Group One Trading LLC ($0).
| Rank | Institution | Value | Shares | Change |
|---|---|---|---|---|
| 1 | SIMPLEX TRADING, LLC | $78,498 | 4,200 | Added |
| 2 | GROUP ONE TRADING LLC | $0 | 0 | Exited |
Source: SEC Form 13F filings · as of 2026-06-30