CUSIP: 98943L107 | NYSE | Healthcare · Biotechnology | Micro Cap | 416 institutional holders
5%+ stakes reported outside the quarterly cycle. A 13D is due within five business days of the event below, so these figures lead the holders table until the filer's next 13F catches up to them.
| Holder | Shares | % of Class | Change | Event Date | vs 13F |
|---|---|---|---|---|---|
| 13G/ABlackRock, Inc. | 3,871,884 | 4.1% | +160,970 | Sep 30, 2026 | 3,753,525 sh (Jun 30, 2026) |
| 13G/AWalters Group | 17,844,973 | 18.8% | New 5%+ stake | Aug 14, 2026 | No 13F filer matched |
| 13D/AMatrix Capital Management Company, LP | 0 | 0.0% | Fell below 5% | Dec 30, 2025 | 13,959,973 sh (Sep 30, 2025) |
| Style | Turnover | Location | Filed | ||||
|---|---|---|---|---|---|---|---|
| 1,286,533 | $3.6M | 0.0% | Index | Very Low | Boston, MA | 2026-11-06 | |
| 706,231 | $2.0M | 0.0% | Index | Low | Austin, TX | 2026-11-04 | |
| 306,660 | $849.4K | 0.0% | Index | Very Low | Overland Park, KS | 2026-11-02 | |
| 122,068 | $338.1K | 0.0% | Core | Low | New York, NY | 2026-11-05 | |
| 115,112 | $318.9K | 6.9% | N/A | N/A | San Diego, CA | 2026-11-03 | |
| 110,000 | $304.7K | 0.0% | Value | Very Low | Lexington, KY | 2026-11-06 | |
| 77,383 | $214.3K | 0.0% | Core | Low | Seattle, WA | 2026-11-06 | |
| 68,745 | $172.6K | 0.0% | Core | Low | Plymouth, MN | 2026-10-13 | |
| 61,412 | $170.1K | 0.0% | ETF | Low | Waltham, MA | 2026-11-02 | |
| 59,536 | $164.9K | 0.0% | Core | Very High | Chicago, IL | 2026-11-04 | |
| 43,898 | $121.6K | 0.0% | Core | Very High | New York, NY | 2026-11-05 | |
| 42,709 | $118.3K | 0.0% | Core | Medium | Frankfurt Am Main, Hong Kong | 2026-11-06 | |
| 20,911 | $57.9K | 0.0% | Core | Medium | New York, NY | 2026-11-04 | |
| 20,529 | $56.9K | 0.0% | Core | Medium | London, United Kingdom | 2026-11-06 | |
| 17,357 | $48.1K | 0.0% | GARP | Medium | Bellevue, WA | 2026-10-23 | |
| 13,000 | $36.0K | 0.0% | Core | Low | New York, NY | 2026-10-26 | |
| 10,750 | $29.8K | 0.0% | Core | Medium | Solana Beach, CA | 2026-10-09 | |
| 10,186 | $28.2K | 0.0% | ETF | Very Low | St. Peters, MO | 2026-11-04 | |
| 2,442 | $6.8K | 0.0% | Core | Medium | Birmingham, AL | 2026-11-04 | |
| 2,350 | $6.5K | 0.0% | Growth | Very Low | Atlanta, GA | 2026-10-19 | |
| 987 | $2.7K | 0.0% | GARP | Medium | Charlotte, NC | 2026-10-22 | |
| 418 | $1.2K | 0.0% | ETF | Very Low | Sylvania, OH | 2026-10-26 | |
| 387 | $1.1K | 0.0% | Index | Very Low | St. Louis, MO | 2026-10-20 | |
| 209 | $579 | 0.0% | ETF | Medium | Scottsdale, AZ | 2026-10-14 | |
| 205 | $568 | 0.0% | Index | Very Low | Foster City, CA | 2026-10-08 | |
| 127 | $352 | 0.0% | Agg Growth | Low | Tokyo, Mexico | 2026-10-22 | |
| 89 | $247 | 0.0% | ETF | Medium | Encinitas, CA | 2026-10-21 | |
| 55 | $152 | 0.0% | Index | Low | San Francisco, CA | 2026-10-08 | |
| 55 | $152 | 0.0% | Growth | Very High | Hong Kong, South Korea | 2026-10-29 | |
| 25 | $69 | 0.0% | Growth | Low | Tampa, FL | 2026-10-16 | |
| 21 | $59 | 0.0% | GARP | High | Meridian, ID | 2026-10-22 |