9 institutions reported holding $3.1M of ROUNDHILL ETF TRUST (MAGY) in SEC 13F filings for 2026-03-31. Largest institutional holders: CITADEL ADVISORS LLC ($1.7M), SUSQUEHANNA INTERNATIONAL GROUP, LLP ($636,494), OLD MISSION CAPITAL LLC ($373,661), HRT FINANCIAL LP ($309,000), OSAIC HOLDINGS, INC. ($86,618). Source: SEC Form 13F.
| Rank | Institution | Value | Shares | Change |
|---|---|---|---|---|
| 1 | CITADEL ADVISORS LLC | $1.7M | 38,150 | Added |
| 2 | SUSQUEHANNA INTERNATIONAL GROUP, LLP | $636,494 | 14,329 | Trimmed |
| 3 | OLD MISSION CAPITAL LLC | $373,661 | 8,412 | Trimmed |
| 4 | HRT FINANCIAL LP | $309,000 | 6,975 | New |
| 5 | OSAIC HOLDINGS, INC. | $86,618 | 1,950 | Hold |
| 6 | UBS Group AG | $20,122 | 453 | New |
| 7 | IFP Advisors, Inc | $9,772 | 220 | New |
| 8 | MORGAN STANLEY | $78 | 1 | Hold |
| 9 | WELLS FARGO & COMPANY/MN | $61 | 1 | Hold |
Source: SEC Form 13F filings · as of 2026-03-31