Institutional HoldersBeta
Who holds a company, from every 13F filed for the quarter, one row per filer exactly as filed, against the latest share count the company reported.
Share classes (cover page of the 10-Q filed 2026-08-14, as of 2026-08-14)
| Class | Listed | Shares outstanding | Held by 13F filers | % of class | Holders | CUSIP |
|---|---|---|---|---|---|---|
| Common stock | GCTK · NASDAQ | 10,578,822 | 587,976 | 5.6% | 19 | 45824Q804 |
Each class is compared with its own share count; classes are not added together. A class that is not exchange-listed cannot be held by 13F filers.
Top holders (19 of 19 · 45824Q804)
change vs 2026-03-31| # | Filer | Shares | % of class | Value | Change |
|---|---|---|---|---|---|
| 1 | HRT FINANCIAL LP | 205,442 | 1.94% | $65K | +164,811 (+405.6%) |
| 2 | JANE STREET GROUP, LLC | 128,459 | 1.21% | $41K | NEW |
| 3 | CITADEL ADVISORS LLC | 79,530 | 0.75% | $25K | NEW |
| 4 | Ikarian Capital, LLC | 45,830 | 0.43% | $15K | — |
| 5 | GEODE CAPITAL MANAGEMENT, LLC | 34,207 | 0.32% | $11K | -12,794 (-27.2%) |
| 6 | Virtu Financial LLC | 18,726 | 0.18% | $6K | NEW |
| 7 | GRANITE ISLANDS PRIVATE WEALTH, LLC | 15,700 | 0.15% | $5K | NEW |
| 8 | BOOTHBAY FUND MANAGEMENT, LLC | 13,525 | 0.13% | $4K | — |
| 9 | UBS Group AG | 13,343 | 0.13% | $4K | +12,641 (+1800.7%) |
| 10 | CITIGROUP INC | 12,872 | 0.12% | $4K | NEW |
| 11 | SUSQUEHANNA INTERNATIONAL GROUP, LLP | 10,546 | 0.10% | $3K | NEW |
| 12 | ALERUS FINANCIAL NA | 4,000 | 0.04% | $1K | — |
| 13 | Tower Research Capital LLC (TRC) | 3,442 | 0.03% | $1K | — |
| 14 | BARCLAYS PLC | 1,259 | 0.01% | $402 | NEW |
| 15 | PlanVest Financial, Inc | 1,000 | 0.01% | $319 | NEW |
| 16 | Tradewinds Capital Management, LLC | 50 | 0.00% | $16 | NEW |
| 17 | NFSG Corp | 34 | 0.00% | $11 | — |
| 18 | SBI Securities Co., Ltd. | 9 | 0.00% | $3 | — |
| 19 | OSAIC HOLDINGS, INC. | 2 | 0.00% | $0 | — |
Exited since 2026-03-31 (3 filers; largest 3 shown)
| VANGUARD FIDUCIARY TRUST CO | −4,722 |
| MORGAN STANLEY | −1 |
| ROYAL BANK OF CANADA | −1 |
Large holders from 13D/13G (latest per reporting person, last 2 years)
Filed when a holder crosses 5% or changes materially, so often more current than the quarter-end 13F. Percentages are the filer's own, against the share count they used.
| Reporting person | Form | Filed | Event | Shares | % of class |
|---|---|---|---|---|---|
| White Lion Capital LLC | SCHEDULE 13G | 2026-09-02 | 2026-08-26 | 79,734 | 9.99% |
| Armistice Capital, LLC | SCHEDULE 13G/A | 2026-05-15 | 2026-03-31 | 102,115 | 4.99% |
| Steven Boyd | SCHEDULE 13G/A | 2026-05-15 | 2026-03-31 | 102,115 | 4.99% |
| Ikarian Capital, LLC | SCHEDULE 13G | 2026-02-17 | 2025-12-31 | 45,830 | 4.5% |
| Neil Shahrestani | SCHEDULE 13G | 2026-02-17 | 2025-12-31 | 45,830 | 4.5% |
| HAL MINTZ | SCHEDULE 13G/A | 2025-01-03 | 2024-12-31 | 647,055 | 4.9% |
| SABBY MANAGEMENT, LLC | SCHEDULE 13G/A | 2025-01-03 | 2024-12-31 | 647,055 | 4.9% |
| SABBY VOLATILITY WARRANT MASTER FUND LTD | SCHEDULE 13G/A | 2025-01-03 | 2024-12-31 | 647,055 | 4.9% |
Source: SEC Form 13F-HR information tables for the quarter ending 2026-06-30 (filed within 45 days of quarter end; amendments applied; values normalised to dollars), the share count from the company's latest 10-K/10-Q XBRL cover page, and Schedule 13D/13G filings. Each row is a legal 13F filer as filed — related entities (e.g. Vanguard's advisers) are not merged. Retail brokerage accounts are not reported on 13F, so the remainder is mostly retail and insiders.