% of shares outstanding not shown: no SEC cover-page share count falls within 120 days of the 2026-Q1 quarter end, so any percentage would rest on a count that cannot speak for this quarter. Holder share counts are shown as filed.
Crowding percentile withheld — no market cap for IOBTQ 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 | Ikarian Capital, LLC | 1,386,5651.4M | $81,391 | — | — |
| 2 | BOOTHBAY FUND MANAGEMENT, LLC | 451,852451,852 | $26,524 | — | — |
| 3 | GSA CAPITAL PARTNERS LLP | 348,352348,352 | $20,000 | — | NEW |
| 4 | MARSHALL WACE, LLP | 301,291301,291 | $18,077 | — | TRIM -30% |
| 5 | XTX Topco Ltd | 265,792265,792 | $15,602 | — | ADD 1575% |
| 6 | MORGAN STANLEY | 206,215206,215 | $12,105 | — | TRIM -62% |
| 7 | MILLENNIUM MANAGEMENT LLC | 194,158194,158 | $11,397 | — | ADD 40% |
| 8 | CITIGROUP INC | 72,49572,495 | $4,255 | — | TRIM -35% |
| 9 | JANE STREET GROUP, LLC | 57,97457,974 | $3,403 | — | NEW |
| 10 | Beacon Pointe Advisors, LLC | 42,60042,600 | $2,501 | — | TRIM -92% |
| 11 | GEODE CAPITAL MANAGEMENT, LLC | 33,30733,307 | $1,955 | — | — |
| 12 | UBS Group AG | 30,98030,980 | $1,828 | — | TRIM -29% |
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 |
|---|---|---|---|---|---|---|---|
| Ikarian Capital, LLC | — | — | — | 1.5M | 1.4M | 1.4M | $81,391 |
| BOOTHBAY FUND MANAGEMENT, LLC | — | — | — | 591K | 452K | 452K | $26,524 |
| GSA CAPITAL PARTNERS LLP | — | — | — | — | — | 348K | $20,000 |
| MARSHALL WACE, LLP | 2.1M | 2.1M | 2.1M | 1.1M | 429K | 301K | $18,077 |
| XTX Topco Ltd | 28K | 50K | 29K | 179K | 16K | 266K | $15,602 |
| MORGAN STANLEY | 859K | 789K | 654K | 668K | 539K | 206K | $12,105 |
| MILLENNIUM MANAGEMENT LLC | — | — | — | 1.4M | 139K | 194K | $11,397 |
| CITIGROUP INC | 5 | — | 314 | 1K | 111K | 72K | $4,255 |
| JANE STREET GROUP, LLC | — | 24K | 26K | — | — | 58K | $3,403 |
| Beacon Pointe Advisors, LLC | — | — | — | — | 506K | 43K | $2,501 |
| GEODE CAPITAL MANAGEMENT, LLC | 33K | 33K | 33K | 33K | 33K | 33K | $1,955 |
| UBS Group AG | 47K | 12K | 13K | 7K | 44K | 31K | $1,828 |
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 | 12 | 3,391,581 |
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 | |
|---|---|---|---|
| GSA CAPITAL PARTNERS LLP | +348,352 | — | OPEN |
| XTX Topco Ltd | +249,928 | — | ADD |
| JANE STREET GROUP, LLC | +57,974 | — | OPEN |
| MILLENNIUM MANAGEMENT LLC | +55,442 | — | ADD |
| Biggest sellers | Δ shares | Δ value | |
|---|---|---|---|
| NOVO HOLDINGS A/S | −2,512,453 | — | CLOSE |
| BANK OF AMERICA CORP /DE/ | −799,953 | — | CLOSE |
| Beacon Pointe Advisors, LLC | −463,400 | — | TRIM |
| Dauntless Investment Group, LLC | −451,641 | — | CLOSE |
| MORGAN STANLEY | −332,967 | — | TRIM |
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 quarter-end close — rather than differencing two filings' own reported values, which would mix the quarter's price move into the trade figure. No licensed quarter-end close is stored for this line, so the dollar columns are withheld; share counts stand.
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).
| — |
| $199,038 |
| 2025-Q4 | 22 | 7,848,183 | — | $5M |
| 2025-Q3 | 21 | 9,895,875 | — | $4M |
| 2025-Q2 | 26 | 18,182,707 | — | $25M |
| 2025-Q1 | 22 | 19,111,617 | — | $21M |
| 2024-Q4 | 27 | 19,737,862 | — | $18M |
| 2024-Q3 | 20 | 23,636,882 | — | $25M |
| 2024-Q2 | 20 | 26,721,876 | — | $31M |
| 2024-Q1 | 18 | 31,781,378 | — | $55M |
| 2023-Q4 | 18 | 31,682,403 | — | $60M |
| 2023-Q3 | 19 | 29,668,665 | — | $42M |
| 2023-Q2 | 15 | 12,246,779 | — | $24M |
| 2023-Q1 | 17 | 13,917,553 | — | $26M |
| 2022-Q4 | 17 | 14,281,285 | — | $33M |
| 2022-Q3 | 21 | 15,335,558 | — | $42M |
| 2022-Q2 | 18 | 15,453,557 | — | $72M |
| 2022-Q1 | 19 | 14,858,855 | — | $77M |
| 2021-Q4 | 20 | 15,038,466 | — | $93M |
