3 institutions reported holding $14 of PROSHARES TR (MZZ) in SEC 13F filings for 2026-03-31. Largest institutional holders: MORGAN STANLEY ($14), SUSQUEHANNA INTERNATIONAL GROUP, LLP ($0), Tower Research Capital LLC (TRC) ($0). Source: SEC Form 13F.
| Rank | Institution | Value | Shares | Change |
|---|---|---|---|---|
| 1 | MORGAN STANLEY | $14 | 1 | Hold |
| 2 | SUSQUEHANNA INTERNATIONAL GROUP, LLP | $0 | 0 | Exited |
| 3 | Tower Research Capital LLC (TRC) | $0 | 0 | Exited |
Source: SEC Form 13F filings · as of 2026-03-31