% 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 NIOBW 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 | BOOTHBAY FUND MANAGEMENT, LLC | 520,000520,000 | $2M | — | — |
| 2 | Caption Management, LLC | 668,553668,553 | $1M | — | ADD 8% |
| 3 | ARISTEIA CAPITAL, L.L.C. | 662,240662,240 | $1M | — | ADD 19% |
| 4 | Altshuler Shaham Ltd | 479,999479,999 | $820,798 | — | — |
| 5 | PEAK6 LLC | 352,780352,780 | $603,254 | — | TRIM -13% |
| 6 | Blue Owl Capital Holdings LP | 320,100320,100 | $524,964 | — | TRIM -63% |
| 7 | Oasis Management Co Ltd. | 100,000100,000 | $446,000 | — | — |
| 8 | JANE STREET GROUP, LLC | 201,052201,052 | $343,799 | — | — |
| 9 | WOLVERINE ASSET MANAGEMENT LLC | 195,282195,282 | $333,932 | — | TRIM -20% |
| 10 | Linden Advisors LP | 194,210194,210 | $326,273 | — | — |
| 11 | Ethic Inc. | 21,93121,931 | $97,812 | — | NEW |
| 12 | Ionic Capital Management LLC | 47,42347,423 | $81,093 | — | ADD 60% |
| 13 | Limestone Investment Advisors LP | 42,92142,921 | $73,395 | — | — |
| 14 | D. E. Shaw & Co., Inc. | 44,21144,211 | $72,506 | — | — |
| 15 | VR Advisory Services Ltd | 15,35615,356 | $26,259 | — | — |
| 16 | NewEdge Advisors, LLC | 18,31318,313 | $18,313 | — | TRIM -5% |
| 17 | Flaharty Asset Management, LLC | 10,00010,000 | $17,100 | — | — |
| 18 | Sanctuary Advisors, LLC | 10,00010,000 | $17,100 | — | — |
| 19 | EQUITEC PROPRIETARY MARKETS, LLC | 4,0004,000 | $6,840 | — | — |
| 20 | UBS Group AG | 1,4861,486 | $2,541 | — | NEW |
| 21 | PITTENGER & ANDERSON INC | 300300 | $513 | — | — |
| 22 | TD Capital Management LLC | 150150 | $257 | — | — |
| 23 | OSAIC HOLDINGS, INC. | 7575 | $128 | — | — |
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 |
|---|---|---|---|---|---|---|---|
| BOOTHBAY FUND MANAGEMENT, LLC | — | — | — | 40K | 510K | 520K | $2M |
| Caption Management, LLC | — | — | — | 136K | 618K | 669K | $1M |
| ARISTEIA CAPITAL, L.L.C. | — | — | 455K | 598K | 558K | 662K | $1M |
| Altshuler Shaham Ltd | 490K | 490K | 490K | 480K | 480K | 480K | $820,798 |
| PEAK6 LLC | — | — | — | 404K | 404K | 353K | $603,254 |
| Blue Owl Capital Holdings LP | 767K | 767K | 546K | 546K | 876K | 320K | $524,964 |
| Oasis Management Co Ltd. | 100K | 100K | 100K | 100K | 100K | 100K | $446,000 |
| JANE STREET GROUP, LLC | 201K | 201K | 201K | 201K | 201K | 201K | $343,799 |
| WOLVERINE ASSET MANAGEMENT LLC | 95K | 96K | 78K | 118K | 245K | 195K | $333,932 |
| Linden Advisors LP | 194K | 194K | 194K | 194K | 194K | 194K | $326,273 |
| Ethic Inc. | — | — | — | — | — | 22K | $97,812 |
| Ionic Capital Management LLC | — | — | — | 198K | 30K | 47K | $81,093 |
| Limestone Investment Advisors LP | — | — | 61K | 61K | 43K | 43K | $73,395 |
| D. E. Shaw & Co., Inc. | 44K | 44K | 44K | 44K | 44K | 44K | $72,506 |
| VR Advisory Services Ltd | 15K | 15K | 15K | 15K | 15K | 15K | $26,259 |
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 | 23 | 3,910,382 | — | $8M |
| 2025-Q4 | 23 | 4,412,298 | — | $10M |
| 2025-Q3 | 23 | 3,499,179 | — | $7M |
| 2025-Q2 | 21 | 2,785,831 | — | $2M |
| 2025-Q1 | 21 | 2,555,690 | — | $598,440 |
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 | |
|---|---|---|---|
| ARISTEIA CAPITAL, L.L.C. | +104,339 | — | ADD |
| Caption Management, LLC | +50,797 | — | ADD |
| Ethic Inc. | +21,931 | — | OPEN |
| Ionic Capital Management LLC | +17,842 | — | ADD |
| BOOTHBAY FUND MANAGEMENT, LLC | +10,000 | — | — |
| Biggest sellers | Δ shares | Δ value | |
|---|---|---|---|
| Blue Owl Capital Holdings LP | −556,048 | — | TRIM |
| PEAK6 LLC | −51,572 | — | TRIM |
| K2 PRINCIPAL FUND, L.P. | −50,100 | — | CLOSE |
| WOLVERINE ASSET MANAGEMENT LLC | −49,476 | — | TRIM |
| NewEdge Advisors, LLC | −1,021 | — | 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).
| 2024-Q4 |
| 24 |
| 3,406,675 |
| — |
| $460,805 |
| 2024-Q3 | 23 | 4,224,501 | — | $725,042 |
| 2024-Q2 | 26 | 4,582,593 | — | $1M |
| 2024-Q1 | 25 | 3,742,389 | — | $2M |
| 2023-Q4 | 22 | 3,661,526 | — | $2M |
| 2023-Q3 | 24 | 3,433,156 | — | $2M |
| 2023-Q2 | 21 | 2,907,934 | — | $2M |
| 2023-Q1 | 23 | 3,275,379 | — | $2M |
