% of shares outstanding not shown: this line files 20-F annual reports only — a foreign private issuer whose US listing trades as ADSs (depositary receipts), while its cover-page share count is in ORDINARY shares. The depositary ratio is not in our data. The count we hold for this line is 2,674,633,957 shares (as of 2025-12-31, source dei). Dividing one by the other is wrong by the whole ratio (a 5:1 ADR reads one fifth of the true percentage), so the percentage is withheld rather than served wrong. Holder share counts are shown as filed.
Crowding percentile withheld — no market cap for IONR in the served universe — the cohort is size-matched, and an unmatched percentile would compare a micro-cap register to a mega-cap one.
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 |
|---|---|---|---|---|---|---|---|
| Invesco Ltd. | — | — | — | — | — | 2.2M | $10M |
| Integrated Wealth Concepts LLC | — | — | — | — | — | 189K | $802,323 |
| UBS Group AG | 28 | 18K | 947 | 243 | 2K | 110K | $466,382 |
| CITIGROUP INC | — | — | — | — | — | 100K | $425,500 |
| Cambridge Investment Research Advisors, Inc. | — | — | — | — | — | 97K | $411,000 |
| GOLDMAN SACHS GROUP INC | — | — | — | — | — | 38K | $162,660 |
| MILLENNIUM MANAGEMENT LLC | — | — | — | — | 20K | 33K | $139,573 |
| KING LUTHER CAPITAL MANAGEMENT CORP | — | — | — | — | — | 25K | $106,375 |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP | — | — | — | — | 11K | 24K | $104,111 |
| JPMORGAN CHASE & CO | — | — | — | — | — | 5K | $24,129 |
| MORGAN STANLEY | 15K | 1K | 4K | 10K | 61K | 4K | $17,467 |
| RHUMBLINE ADVISERS | — | — | — | — | 2K | 4K | $15,825 |
| GAMMA Investing LLC | — | — | — | — | 1K | 2K | $8,744 |
| Marquette Asset Management, LLC | — | — | 2K | 2K | 2K | 2K | $8,510 |
| EverSource Wealth Advisors, LLC | — | — | 202 | 1K | 27 | 2K | $8,033 |
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.
Holder count only — too few computable %-of-shares-outstanding quarters for a % pane. Line breaks are quarters with no 13F record, never interpolated.
| Quarter | Holders | Shares held | % shares out | Value held |
|---|---|---|---|---|
| 2026-Q1 | 22 | 2,872,825 | — | $12M |
| 2025-Q4 | 23 | 491,463 | — | $2M |
| 2025-Q3 | 13 | 130,668 | — | $583,422 |
| 2025-Q2 | 12 | 64,177 | — |
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 | |
|---|---|---|---|
| Invesco Ltd. | +2,236,604 | $10M | OPEN |
| Integrated Wealth Concepts LLC | +188,560 | $802,323 | OPEN |
| UBS Group AG | +107,458 | $457,234 | ADD |
| CITIGROUP INC | +100,000 | $425,500 | OPEN |
| Cambridge Investment Research Advisors, Inc. | +96,547 | $410,807 | OPEN |
| Biggest sellers | Δ shares | Δ value | |
|---|---|---|---|
| MARSHALL WACE, LLP | −165,231 | $703,058 | CLOSE |
| CITADEL ADVISORS LLC | −56,915 | $242,173 | CLOSE |
| MORGAN STANLEY | −56,800 | $241,684 | TRIM |
| JANE STREET GROUP, LLC | −40,497 | $172,315 | CLOSE |
| GK Wealth Management LLC | −33,775 | $143,713 | CLOSE |
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).
| $167,671 |
| 2025-Q1 | 8 | 84,168 | — | $329,101 |
| 2024-Q4 | 7 | 52,430 | — | $209,197 |
| 2024-Q3 | 3 | 2,139 | — | $14,218 |
| 2024-Q2 | 2 | 3,700 | — | $14,837 |
| 2024-Q1 | 2 | 18,937 | — | $81,430 |
| 2023-Q4 | 4 | 80,641 | — | $326,034 |
| 2023-Q3 | 6 | 67,264 | — | $396,301 |
| 2023-Q2 | 4 | 42,796 | — | $390,205 |
| 2023-Q1 | 6 | 47,929 | — | $383,901 |
| 2022-Q4 | 6 | 56,979 | — | $605,977 |
| 2022-Q3 | 4 | 45,718 | — | $750,000 |
