| # | Holder | Shares | Value | % of shares out | Δ QoQ |
|---|---|---|---|---|---|
| 1 | NEEDHAM INVESTMENT MANAGEMENT LLC | 1,670,5501.7M | $7M | 21.64% | ADD 132% |
| 2 | MYDA Advisors LLC | 400,000400,000 | $2M | 5.18% | NEW† |
| 3 | Nantahala Capital Management, LLC | 280,000280,000 | $1M | 3.63% | NEW† |
| 4 | Bleichroeder LP | 270,925270,925 | $1M | 3.51% | ADD 23% |
| 5 | WealthTrust Axiom LLC | 254,108254,108 | $1M | 3.29% | ADD 10% |
| 6 | VANGUARD CAPITAL MANAGEMENT LLC | 194,125194,125 | $852,209 | 2.51% | NEW |
| 7 | Archon Capital Management LLC | 156,805156,805 | $688,374 | 2.03% | NEW |
| 8 | MORGAN STANLEY | 143,794143,794 | $631,256 | 1.86% | ADD 56% |
| 9 | Stonepine Capital Management, LLC | 100,000100,000 | $439,000 | 1.30% | NEW |
| 10 | HighTower Advisors, LLC | 96,56596,565 | $423,920 | 1.25% | — |
| 11 | GEODE CAPITAL MANAGEMENT, LLC | 65,98265,982 | $289,714 | 0.85% | ADD 13% |
| 12 | BOOTHBAY FUND MANAGEMENT, LLC | 50,00050,000 | $219,500 | 0.65% | NEW |
| 13 | Mesirow Financial Investment Management, Inc. | 46,72846,728 | $205,138 | 0.61% | NEW |
| 14 | Manatuck Hill Partners, LLC | 37,50037,500 | $164,625 | 0.49% | NEW |
| 15 | VANGUARD FIDUCIARY TRUST CO | 29,34129,341 | $128,807 | 0.38% | NEW |
| 16 | NORTHERN TRUST CORP | 23,41223,412 | $102,779 | 0.30% | ADD 41% |
| 17 | CITADEL ADVISORS LLC | 23,23523,235 | $102,002 | 0.30% | ADD 5% |
| 18 | BlackRock, Inc. | 16,10516,105 | $70,701 | 0.21% | ADD 9% |
| 19 | XTX Topco Ltd | 10,07610,076 | $44,234 | 0.13% | NEW |
| 20 | UBS Group AG | 715715 | $3,139 | 0.01% | — |
| 21 | Tower Research Capital LLC (TRC) | 657657 | $2,884 | 0.01% | TRIM -22% |
| 22 | Front Row Advisors LLC | 2626 | $114 | 0.00% | — |
| 23 | Banque Transatlantique SA | 1010 | $44 | 0.00% | — |
| 24 | Federation des caisses Desjardins du Quebec | 55 | $22 | 0.00% | — |
| 25 | Financial Perspectives, Inc | 22 | $9 | 0.00% | — |
| 26 | Caitong International Asset Management Co., Ltd | 11 | $4 | 0.00% | NEW |
† a filer this large appearing as NEW usually reflects a renamed or succeeded filing entity (the old name stops filing the same quarter) — not a brand-new position.
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 |
|---|---|---|---|---|---|---|---|
| NEEDHAM INVESTMENT MANAGEMENT LLC | 428K | 700K | 700K | 700K | 720K | 1.7M | $7M |
| MYDA Advisors LLC | — | — | — | — | — | 400K | $2M |
| Nantahala Capital Management, LLC | — | — | — | — | — | 280K | $1M |
| Bleichroeder LP | 95K | 220K | 220K | 220K | 220K | 271K | $1M |
| WealthTrust Axiom LLC | 247K | 254K | 249K | 226K | 232K | 254K | $1M |
| VANGUARD CAPITAL MANAGEMENT LLC | — | — | — | — | — | 194K | $852,209 |
| Archon Capital Management LLC | — | — | — | — | — | 157K | $688,374 |
| MORGAN STANLEY | 37K | 41K | 79K | 78K | 92K | 144K | $631,256 |
| Stonepine Capital Management, LLC | — | — | — | — | — | 100K | $439,000 |
| HighTower Advisors, LLC | 72K | 97K | 97K | 97K | 97K | 97K | $423,920 |
| GEODE CAPITAL MANAGEMENT, LLC | 52K | 54K | 54K | 57K | 58K | 66K | $289,714 |
| BOOTHBAY FUND MANAGEMENT, LLC | — | — | — | — | — | 50K | $219,500 |
| Mesirow Financial Investment Management, Inc. | 23K | 23K | 23K | 23K | — | 47K | $205,138 |
| Manatuck Hill Partners, LLC | — | — | — | — | — | 38K | $164,625 |
| VANGUARD FIDUCIARY TRUST CO | — | — | — | — | — | 29K | $128,807 |
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.
Line breaks are honest gaps — quarters with no 13F record, or a suppressed % — never interpolated. % of shares outstanding divides each quarter's as-filed 13F shares by the SEC cover-page share count dated to that same quarter (split-adjusted), not by today's count — so splits and buybacks don't move the line.
| Quarter | Holders | Shares held |
|---|
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 | |
|---|---|---|---|
| NEEDHAM INVESTMENT MANAGEMENT LLC | +950,550 | $4M | ADD |
| MYDA Advisors LLC | +400,000 | $2M | OPEN |
| Nantahala Capital Management, LLC | +280,000 | $1M | OPEN |
| VANGUARD CAPITAL MANAGEMENT LLC | +194,125 | $852,209 | OPEN |
| Archon Capital Management LLC | +156,805 | $688,374 | OPEN |
| Biggest sellers | Δ shares | Δ value | |
|---|---|---|---|
| VANGUARD GROUP INC | −223,466 | $981,016 | CLOSE |
| DRW Securities, LLC | −22,528 | $98,898 | CLOSE |
| JANE STREET GROUP, LLC | −11,578 | $50,827 | CLOSE |
| Tower Research Capital LLC (TRC) | −180 | $790 | TRIM |
| ROYAL BANK OF CANADA | −11 | $48 | 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).
| % shares out |
|---|
| Value held |
|---|
| 2026-Q1 | 26 | 3,870,667 | 50.1% | $17M |
| 2025-Q4 | 20 | 1,731,682 | 22.4% | $7M |
| 2025-Q3 | 20 | 1,734,517 | 22.5% | $8M |
| 2025-Q2 | 20 | 1,741,366 | 22.7% | $9M |
| 2025-Q1 | 20 | 1,523,684 | 23.9% | $6M |
| 2024-Q4 | 20 | 1,120,780 | 17.6% | $5M |
| 2024-Q3 | 18 | 1,210,375 | 19.1% | $7M |
| 2024-Q2 | 19 | 1,004,575 | 16.6% | $6M |
| 2024-Q1 | 17 | 926,391 | 15.3% | $5M |
| 2023-Q4 | 17 | 865,568 | 14.3% | $5M |
| 2023-Q3 | 12 | 546,814 | 9.0% | $3M |
| 2023-Q2 | 12 | 493,358 | 8.7% | $3M |
| 2023-Q1 | 10 | 415,801 | 7.4% | $3M |
| 2022-Q4 | 6 | 307,500 | 5.5% | $2M |
| 2015-Q2 | 1 | 1,269,213 | 20.0% | $952,000 |
| 2015-Q1 | 1 | 1,269,213 | 20.0% | $698,000 |
| 2014-Q4 | 1 | 1,269,213 | 20.3% | $762,000 |
| 2014-Q3 | 1 | 1,269,213 | 20.3% | $953,000 |
| 2014-Q2 | 1 | 1,269,213 | 28.5% | $914,000 |
| 2014-Q1 | 1 | 1,269,213 | 28.5% | $1M |
| 2013-Q4 | 1 | 1,269,213 | 28.5% | $1M |
| 2013-Q3 | 1 | 1,269,213 | 28.5% | $508,000 |
| 2013-Q2 | 1 | 1,269,213 | 28.5% | $762,000 |
