8 institutions reported holding $273.8M of T-MOBILE US INC (TMUSR) in SEC 13F filings for 2026-03-31. Largest institutional holders: IMC-Chicago, LLC ($159.9M), JPMORGAN CHASE & CO ($41.9M), SIMPLEX TRADING, LLC ($34.3M), NATIONAL BANK OF CANADA /FI/ ($15.1M), GROUP ONE TRADING LLC ($14.7M). Source: SEC Form 13F.
| Rank | Institution | Value | Shares | Change |
|---|---|---|---|---|
| 1 | IMC-Chicago, LLC | $159.9M | 761,300 | Added |
| 2 | JPMORGAN CHASE & CO | $41.9M | 195,800 | Trimmed |
| 3 | SIMPLEX TRADING, LLC | $34.3M | 163,300 | Trimmed |
| 4 | NATIONAL BANK OF CANADA /FI/ | $15.1M | 720 | New |
| 5 | GROUP ONE TRADING LLC | $14.7M | 70,200 | Trimmed |
| 6 | CMT Capital Markets Trading GmbH | $4.7M | 22,400 | Trimmed |
| 7 | HRT FINANCIAL LP | $3.1M | 15,000 | New |
| 8 | SG Americas Securities, LLC | $0 | 0 | Exited |
Source: SEC Form 13F filings · as of 2026-03-31