3 institutions reported holding $1.8M of PROSHARES TR (MZZ) in SEC 13F filings for 2026-06-30. Largest institutional holders: SYKON CAPITAL LLC ($1.6M), Tower Research Capital LLC (TRC) ($185,937), MORGAN STANLEY ($9). Source: SEC Form 13F.
| Rank | Institution | Value | Shares | Change |
|---|---|---|---|---|
| 1 | SYKON CAPITAL LLC | $1.6M | 273,717 | New |
| 2 | Tower Research Capital LLC (TRC) | $185,937 | 32,383 | New |
| 3 | MORGAN STANLEY | $9 | 1 | Hold |
Source: SEC Form 13F filings · as of 2026-06-30