14 institutions reported holding $4.4M of Defiance Daily Target 2X Short RKLB ETF (RKLZ) in SEC 13F filings for 2026-06-30. Largest institutional holders: JANE STREET GROUP, LLC ($773,625), Jump Financial, LLC ($741,240), Optiver Holding B.V. ($595,378), HRT FINANCIAL LP ($567,000), SUSQUEHANNA INTERNATIONAL GROUP, LLP ($554,685). Source: SEC Form 13F.
| Rank | Institution | Value | Shares | Change |
|---|---|---|---|---|
| 1 | JANE STREET GROUP, LLC | $773,625 | 306,994 | New |
| 2 | Jump Financial, LLC | $741,240 | 294,143 | Added |
| 3 | Optiver Holding B.V. | $595,378 | 236,261 | New |
| 4 | HRT FINANCIAL LP | $567,000 | 225,251 | New |
| 5 | SUSQUEHANNA INTERNATIONAL GROUP, LLP | $554,685 | 220,113 | New |
| 6 | StoneX Group Inc. | $398,829 | 129,925 | Added |
| 7 | TWO SIGMA SECURITIES, LLC | $268,395 | 106,506 | New |
| 8 | CITADEL ADVISORS LLC | $125,191 | 49,679 | Added |
| 9 | FLOW TRADERS U.S. LLC | $116,000 | 45,959 | New |
| 10 | IMC-Chicago, LLC | $94,195 | 37,379 | New |
| 11 | XTX Topco Ltd | $85,420 | 33,897 | New |
| 12 | Ground Swell Capital, LLC | $51,312 | 20,362 | New |
| 13 | RENAISSANCE TECHNOLOGIES LLC | $27,468 | 10,900 | New |
| 14 | Tower Research Capital LLC (TRC) | $0 | 0 | Exited |
Source: SEC Form 13F filings · as of 2026-06-30