13 institutions reported holding $2.5M of ROUNDHILL ETF TRUST (HOOW) in SEC 13F filings for 2026-03-31. Largest institutional holders: CITADEL ADVISORS LLC ($1.5M), GROUP ONE TRADING LLC ($457,332), CENTAURUS FINANCIAL, INC. ($382,000), SIMPLEX TRADING, LLC ($148,536), BRYN MAWR TRUST Co ($37,268). Source: SEC Form 13F.
| Rank | Institution | Value | Shares | Change |
|---|---|---|---|---|
| 1 | CITADEL ADVISORS LLC | $1.5M | 64,900 | Trimmed |
| 2 | GROUP ONE TRADING LLC | $457,332 | 20,444 | Added |
| 3 | CENTAURUS FINANCIAL, INC. | $382,000 | 17,096 | Added |
| 4 | SIMPLEX TRADING, LLC | $148,536 | 6,640 | Added |
| 5 | BRYN MAWR TRUST Co | $37,268 | 1,666 | Added |
| 6 | Farther Finance Advisors, LLC | $3,042 | 134 | Added |
| 7 | Belvedere Trading LLC | $0 | 0 | Exited |
| 8 | Strategic Wealth Partners, Ltd. | $0 | 0 | Exited |
| 9 | IFC & Insurance Marketing, Inc. | $0 | 0 | Exited |
| 10 | Atlantic Union Bankshares Corp | $0 | 0 | Exited |
| 11 | SUSQUEHANNA INTERNATIONAL GROUP, LLP | $0 | 0 | Exited |
| 12 | EXCHANGE TRADED CONCEPTS, LLC | $0 | 0 | Exited |
| 13 | Tower Research Capital LLC (TRC) | $0 | 0 | Exited |
Source: SEC Form 13F filings · as of 2026-03-31