Mar 31, 2026 filings. Quarterly 13F reports arrive up to 45 days after quarter end; this register is filed through May 29, 2026.
118 institutional managers reported holding ZGN for the quarter ended Mar 31, 2026. Together they hold about 25% of shares outstanding; the top 10 hold 19%. 17 opened new positions; 24 closed out. Complete ranked register from SEC 13F filings.
| manager | shares | % out | value (Mar 31, 2026 close) | change | held since |
|---|---|---|---|---|---|
| Temasek Holdings | 27.24M | 10.49% | $283.7M | unchanged | 2025 Q2 |
| Barrow Hanley Mewhinney & Strauss LLC | 4.20M | 1.62% | $43.7M | unchanged | 2025 Q3 |
| T. Rowe Price | 3.96M | 1.52% | $41.2M | unchanged | 2021 Q4 |
| BlackRock | 3.22M | 1.24% | $33.5M | trimmed -1.8% | 2022 Q2 |
| Harris Associates (Oakmark) | 2.91M | 1.12% | $30.3M | trimmed -9.4% | 2025 Q3 |
| Eurizon Capital SGR S.p.A. | 2.01M | 0.77% | $20.9M | opened | 2026 Q1 |
| Point72 | 1.98M | 0.76% | $20.6M | added +959.4% | 2025 Q1 |
| Artisan Partners | 1.84M | 0.71% | $19.2M | trimmed -4.7% | 2023 Q2 |
| American Century Companies INC | 1.57M | 0.61% | $16.4M | added +60.4% | 2022 Q4 |
| UBS | 1.44M | 0.56% | $15.0M | added +72.9% | 2024 Q1 |
| Tabor Asset Management, LP (focused) | 1.44M | 0.55% | $15.0M | added +34.7% | 2023 Q3 |
| Amundi | 1.03M | 0.40% | $10.7M | opened | 2026 Q1 |
| State Street | 976.7k | 0.38% | $10.2M | added +11.1% | 2025 Q2 |
| Osborne Partners Capital Management, LLC | 942.5k | 0.36% | $9.8M | added +34.8% | 2025 Q1 |
| Geode Capital | 731.5k | 0.28% | $7.6M | added +2.3% | 2025 Q2 |
| Portolan Capital Management, LLC | 710.6k | 0.27% | $7.4M | unchanged | 2024 Q4 |
| Walleye Capital LLC | 665.9k | 0.26% | $6.9M | added +1938.7% | 2025 Q4 |
| Bank OF America CORP /DE/ | 583.4k | 0.23% | $6.1M | added +483.2% | 2021 Q4 |
| FIL LTD | 571.7k | 0.22% | $6.0M | trimmed -53.9% | 2021 Q4 |
| Balyasny Asset Management | 554.6k | 0.21% | $5.8M | added +307.3% | 2025 Q4 |
| Qvidtvm Management LLC (focused) | 525.9k | 0.20% | $5.5M | added +10.5% | 2024 Q3 |
| Vanguard Group | 429.0k | 0.17% | $4.5M | added +2.8% | 2024 Q4 |
| SEI Investments CO | 392.2k | 0.15% | $4.1M | trimmed -13.3% | 2023 Q2 |
| Edmond DE Rothschild Holding S.a. | 360.0k | 0.14% | $3.7M | unchanged | 2023 Q4 |
| Fideuram - Intesa Sanpaolo Private Banking S.p.a. | 354.6k | 0.14% | $3.7M | added +82.3% | 2025 Q4 |
| Northern Trust | 327.7k | 0.13% | $3.4M | added +4.5% | 2025 Q2 |
| Federated Hermes, INC. | 323.4k | 0.13% | $3.4M | added +6.9% | 2025 Q1 |
| Squarepoint Ops LLC | 270.0k | 0.10% | $2.8M | opened | 2025 Q2 |
| Goldman Sachs | 247.3k | 0.10% | $2.6M | added +48.6% | 2022 Q2 |
| Two Sigma | 176.6k | 0.07% | $1.8M | trimmed -32.4% | 2023 Q1 |
| NEW York State Common Retirement Fund | 150.6k | 0.06% | $1.6M | trimmed -3% | 2022 Q2 |
| Morgan Stanley | 142.0k | 0.06% | $1.5M | trimmed -33.3% | 2021 Q4 |
| Charles Schwab Investment Management | 134.1k | 0.05% | $1.4M | trimmed -13% | 2025 Q2 |
| Creative Planning | 121.3k | 0.05% | $1.3M | added +43.8% | 2025 Q3 |
| BNY Mellon | 118.4k | 0.05% | $1.2M | trimmed -7.7% | 2025 Q2 |
| Lombard Odier Asset Management (USA) CORP | 115.0k | 0.04% | $1.2M | opened | 2026 Q1 |
| Spectrum Strategic Capital Management, LLC | 114.3k | 0.04% | $1.2M | added +2.5% | 2024 Q3 |
| CastleKnight Management LP | 109.2k | 0.04% | $1.1M | trimmed -31.2% | 2024 Q3 |
| Envestnet Asset Management INC | 108.2k | 0.04% | $1.1M | added +770.8% | 2025 Q1 |
| Renaissance Group LLC | 92.6k | 0.04% | $965k | trimmed -2.7% | 2025 Q1 |
| PDT Partners | 88.7k | 0.03% | $923k | trimmed -48.6% | 2024 Q2 |
| Nuveen | 86.7k | 0.03% | $903k | unchanged | 2022 Q2 |
| Occudo Quantitative Strategies LP | 73.9k | 0.03% | $770k | trimmed -16.4% | 2025 Q2 |
| AQR Capital | 70.7k | 0.03% | $737k | trimmed -0.7% | 2025 Q3 |
| Rhumbline Advisers | 68.0k | 0.03% | $708k | added +0.6% | 2025 Q2 |
| ExodusPoint | 64.5k | 0.03% | $672k | opened | 2026 Q1 |
| Deutsche Bank AG\ | 63.6k | 0.03% | $663k | added +10.7% | 2025 Q2 |
| AllianceBernstein | 53.7k | 0.02% | $559k | unchanged | 2025 Q2 |
| LOS Angeles Capital Management LLC | 51.4k | 0.02% | $536k | added +4% | 2025 Q2 |
| Moore Capital | 50.0k | 0.02% | $521k | unchanged | 2024 Q4 |
Largest 50 of 118 shown; the full ranked, searchable register is at boothcheck.com/holders/ZGN. Related filers are grouped using the filings' own included-manager declarations. Historically, several managers opening new positions in the same quarter said almost nothing about the quarter that followed (59,118 cases since 2013). A filed record, not a forecast. Nothing here is investment advice.