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 2026-08-07, as of 2026-08-04)
| Class | Listed | Shares outstanding | Held by 13F filers | % of class | Holders | CUSIP |
|---|---|---|---|---|---|---|
| Common stock | ZD · NASDAQ | 34,287,208 | 41,001,330 | 119.6% | 267 | 48123V102 |
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 (22 of 22 · 48123VAH5)
change vs 2026-03-31| # | Filer | Shares / principal | % of class | Value | Change |
|---|---|---|---|---|---|
| 1 | TENOR CAPITAL MANAGEMENT Co., L.P. | 45,000,000 | — | $45.6M | -15,000,000 (-25.0%) |
| 2 | D. E. Shaw & Co., Inc. | 42,009,000 | — | $42.1M | +10,000,000 (+31.2%) |
| 3 | Balyasny Asset Management L.P. | 32,500,000 | — | $32.6M | +10,000,000 (+44.4%) |
| 4 | TWO SIGMA INVESTMENTS, LP | 25,000,000 | — | $24.9M | +15,000,000 (+150.0%) |
| 5 | WOLVERINE ASSET MANAGEMENT LLC | 17,500,000 | — | $17.5M | NEW |
| 6 | CAMDEN ASSET MANAGEMENT L P /CA | 15,701,000 | — | $15.6M | — |
| 7 | Jefferies Financial Group Inc. | 13,638,000 | — | $13.7M | +938,000 (+7.4%) |
| 8 | KIM, LLC | 13,165,000 | — | $13.2M | +4,000,000 (+43.6%) |
| 9 | LAZARD ASSET MANAGEMENT LLC | 10,245,000 | — | $102K | -34,000 (-0.3%) |
| 10 | Calamos Advisors LLC | 10,000,000 | — | $10.1M | NEW |
| 11 | BARINGS LLC | 10,000,000 | — | $10.0M | — |
| 12 | Thrivent Financial for Lutherans | 7,015,000 | — | $7.1M | -1,015,000 (-12.6%) |
| 13 | HBK INVESTMENTS L P | 7,000,000 | — | $7.0M | -5,000,000 (-41.7%) |
| 14 | BlackRock, Inc. | 5,085,000 | — | $5.1M | +750,000 (+17.3%) |
| 15 | OAKTREE CAPITAL MANAGEMENT LP | 3,496,000 | — | $3.5M | — |
| 16 | SSI INVESTMENT MANAGEMENT LLC | 2,792,000 | — | $2.8M | +1,250,000 (+81.1%) |
| 17 | MORGAN STANLEY | 2,686,000 | — | $2.7M | +255,000 (+10.5%) |
| 18 | Russell Investments Group, Ltd. | 2,511,000 | — | $2.6M | — |
| 19 | JPMORGAN CHASE & CO | 2,000,000 | — | $2.0M | -1,390,000 (-41.0%) |
| 20 | ZAZOVE ASSOCIATES LLC | 102,000 | — | $103K | -706,000 (-87.4%) |
| 21 | BNP PARIBAS FINANCIAL MARKETS | 34,000 | — | $34K | NEW |
| 22 | ROYAL BANK OF CANADA | 17,000 | — | $17K | NEW |
Exited since 2026-03-31 (3 filers; largest 3 shown)
| Linden Advisors LP | −47,086,000 |
| Ares Systematic Credit Ltd | −500,000 |
| VIRTUS ADVISERS, LLC | −40,000 |
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 |
|---|---|---|---|---|---|
| JANUS HENDERSON GROUP Ltd. | SCHEDULE 13G/A | 2026-09-08 | 2026-08-31 | 3,526,099 | 10.3% |
| LGIM Singapore PTE Ltd | SCHEDULE 13G/A | 2026-08-14 | 2026-06-30 | 7,693 | 0% |
| Legal & General Group Plc | SCHEDULE 13G/A | 2026-08-14 | 2026-06-30 | 1,800,921 | 4.9% |
| Legal & General Investment Management America Inc | SCHEDULE 13G/A | 2026-08-14 | 2026-06-30 | 56,290 | 0.2% |
| Legal & General Investment Management Ltd | SCHEDULE 13G/A | 2026-08-14 | 2026-06-30 | 1,744,631 | 4.7% |
| Legal & General UCITS ETF Plc | SCHEDULE 13G/A | 2026-08-14 | 2026-06-30 | 1,721,283 | 4.7% |
| LGIM Managers (Europe) Limited | SCHEDULE 13G/A | 2026-08-14 | 2026-06-30 | 1,728,976 | 4.7% |
| Vanguard Capital Management | SCHEDULE 13G | 2026-04-30 | 2026-03-31 | 1,998,419 | 5.28% |
| Vanguard Portfolio Management | SCHEDULE 13G | 2026-04-29 | 2026-03-31 | 2,343,118 | 6.19% |
| The Vanguard Group | SCHEDULE 13G/A | 2026-03-27 | 2026-03-13 | 0 | 0% |
| Pale Fire Capital SE | SCHEDULE 13D | 2026-03-03 | 2026-02-24 | 2,597,799 | 6.9% |
| Pale Fire Capital investicni spolecnost a.s. | SCHEDULE 13D | 2026-03-03 | 2026-02-24 | 2,597,799 | 6.9% |
| Pale Fire Capital SICAV a.s. | SCHEDULE 13D | 2026-03-03 | 2026-02-24 | 2,597,799 | 6.9% |
| Senkypl Dusan | SCHEDULE 13D | 2026-03-03 | 2026-02-24 | 2,597,799 | 6.9% |
| Barta Jan | SCHEDULE 13D | 2026-03-03 | 2026-02-24 | 2,597,799 | 6.9% |
| ArrowMark Colorado Holdings, LLC | SCHEDULE 13G/A | 2026-02-17 | 2025-12-31 | 1,367,715 | 3.46% |
| JANUS HENDERSON GROUP PLC | SCHEDULE 13G/A | 2025-11-14 | 2025-09-30 | 3,439,093 | 8.4% |
| BlackRock, Inc. | SCHEDULE 13G/A | 2025-07-17 | 2025-06-30 | 6,292,575 | 15% |
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.