7 institutions reported holding $242.0M of NRG ENERGY INC (NRG1) in SEC 13F filings for 2026-06-30. Largest institutional holders: GROUP ONE TRADING LLC ($154.8M), IMC-Chicago, LLC ($57.3M), SIMPLEX TRADING, LLC ($25.0M), HRT FINANCIAL LP ($2.7M), Capricorn Fund Managers Ltd ($2.1M). Source: SEC Form 13F.
| Rank | Institution | Value | Shares | Change |
|---|---|---|---|---|
| 1 | GROUP ONE TRADING LLC | $154.8M | 1.1M | Added |
| 2 | IMC-Chicago, LLC | $57.3M | 392,100 | Added |
| 3 | SIMPLEX TRADING, LLC | $25.0M | 171,500 | Added |
| 4 | HRT FINANCIAL LP | $2.7M | 18,400 | Added |
| 5 | Capricorn Fund Managers Ltd | $2.1M | 1,500 | New |
| 6 | CenterStar Asset Management, LLC | $0 | 0 | Exited |
| 7 | LuminArx Capital Management LP | $0 | 0 | Exited |
Source: SEC Form 13F filings · as of 2026-06-30