% of shares outstanding is not shown for IREZ: this is a fund line, and we hold no cover-page share count for it at any quarter — a fund's shares outstanding move with creations and redemptions rather than with issuance and buybacks, and it is not the SEC cover-page count this percentage is defined against. The figure is withheld rather than computed against a count that does not exist. Holder share counts are shown as filed.
Crowding percentile withheld — no market cap for IREZ in the served universe — the cohort is size-matched, and an unmatched percentile would compare a micro-cap register to a mega-cap one.
| # | Holder | Shares | Value | % of shares out | Δ QoQ |
|---|---|---|---|---|---|
| 1 | Jump Financial, LLC | 42,97242,972 | $1M | — | NEW |
| 2 | Optiver Holding B.V. | 29,68829,688 | $893,312 | — | NEW |
| 3 | SUSQUEHANNA INTERNATIONAL GROUP, LLP | 28,32528,325 | $852,299 | — | NEW |
| 4 | JANE STREET GROUP, LLC | 27,39727,397 | $824,376 | — | NEW |
| 5 | IMC-Chicago, LLC | 20,04720,047 | $603,214 | — | NEW |
| 6 | SIMPLEX TRADING, LLC | 15,70615,706 | $472,593 | — | NEW |
| 7 | MIRAE ASSET SECURITIES (USA) INC. | 15,00015,000 | $451,350 | — | NEW |
| 8 | CITADEL ADVISORS LLC | 8,6438,643 | $260,068 | — | NEW |
| 9 | RENAISSANCE TECHNOLOGIES LLC | 7,2007,200 | $216,648 | — | NEW |
| 10 | StoneX Group Inc. | 6,7306,730 | $202,506 | — | NEW |
Rows rank by the value each filer reported — 13F filers price their own positions, so a holder with fewer shares can rank just above one with more.
| Holder | 2024-Q4 | 2025-Q1 | 2025-Q2 | 2025-Q3 | 2025-Q4 | 2026-Q1 | Latest value |
|---|---|---|---|---|---|---|---|
| Jump Financial, LLC | — | — | — | — | — | 43K | $1M |
| Optiver Holding B.V. | — | — | — | — | — | 30K | $893,312 |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP | — | — | — | — | — | 28K | $852,299 |
| JANE STREET GROUP, LLC | — | — | — | — | — | 27K | $824,376 |
| IMC-Chicago, LLC | — | — | — | — | — | 20K | $603,214 |
| SIMPLEX TRADING, LLC | — | — | — | — | — | 16K | $472,593 |
| MIRAE ASSET SECURITIES (USA) INC. | — | — | — | — | — | 15K | $451,350 |
| CITADEL ADVISORS LLC | — | — | — | — | — | 9K | $260,068 |
| RENAISSANCE TECHNOLOGIES LLC | — | — | — | — | — | 7K | $216,648 |
| StoneX Group Inc. | — | — | — | — | — | 7K | $202,506 |
Shares reported each quarter by the largest current holders. Green = added vs the prior filing, red = trimmed, grey = roughly held; a dash is a quarter with no 13F on file (a gap is skipped, not read as an exit). 13F is filed up to 45 days after quarter-end. Up to 40 quarters (10 years) available — use the selector above.
Short interest has its own tab now — open SI →
Source: SEC Form 13F — every institution manager (≥ $100M in 13F securities) reporting a long US-listed position, across ~10,250 filers over 10 years of history. 13F is long-only, US-listed, filed up to 45 days after quarter-end.
| Biggest buyers | Δ shares | Δ value | |
|---|---|---|---|
| Jump Financial, LLC | +42,972 | $430,578 | OPEN |
| Optiver Holding B.V. | +29,688 | $297,473 | OPEN |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP | +28,325 | $283,816 | OPEN |
| JANE STREET GROUP, LLC | +27,397 | $274,517 | OPEN |
| IMC-Chicago, LLC | +20,047 | $200,870 | OPEN |
| Biggest sellers | Δ shares | Δ value | |
|---|---|---|---|
| No filer reduced its position this quarter. | |||
The 2025-Q4 register is as-filed in ITS OWN share basis; every count below was rebased into the 2026-Q1 basis (no split in between, factor 1). Dollar figures value the SHARE delta at one price — the 2026-03-31 close — rather than differencing two filings' own reported values, which would mix the quarter's price move into the trade figure.
13Fs disclose LONG US-listed positions only — shorts, most derivatives, bonds and non-US listings are invisible here, and a filer's quarter-over-quarter change is not necessarily a trade (index rebalances, in-kind transfers and entity successions all read as flow).
