ZURA BIO LTD ZURA
CLASS A ORD SHS · Common Stock · CUSIP G9TY5A101
- SectorHealth care
- IndustryBiological Products, (No Diagnostic Substances)
- HeadquartersLa Jolla, CA
- FilingsSEC EDGAR
* Summed across managers. Shares that two managers' reports both contain – a subsidiary's holdings that its parent's report includes too, or a sub-adviser's in its client's – are counted once. Holder counts are more reliable. Shares outstanding: 95.8m as of 2026-08-11, from the company's own SEC filing; the percentage can still exceed 100%: lent-out shares are counted by the lender and the buyer, and some reports overlap without saying so. Implied quarter-end price ≈ $5.88. Options: 3 managers hold calls ($837.8k notional), 2 hold puts ($630.7k).
Trends to Q2 2026
Institutional holders
Managers reporting a position, each quarter
Numbers
| Quarter | Holders |
|---|---|
| Q1 2023 | 3 |
| Q2 2023 | 39 |
| Q3 2023 | 42 |
| Q4 2023 | 45 |
| Q1 2024 | 46 |
| Q2 2024 | 58 |
| Q3 2024 | 78 |
| Q4 2024 | 88 |
| Q1 2025 | 74 |
| Q2 2025 | 65 |
| Q3 2025 | 66 |
| Q4 2025 | 74 |
| Q1 2026 | 94 |
| Q2 2026 | 95 |
Buyers vs sellers
Managers adding to or starting a position, vs cutting or selling out
Numbers
| Quarter | Bought or added | Cut or sold out |
|---|---|---|
| Q3 2024 | 53 | 13 |
| Q4 2024 | 51 | 24 |
| Q1 2025 | 29 | 38 |
| Q2 2025 | 33 | 49 |
| Q3 2025 | 31 | 38 |
| Q4 2025 | 45 | 30 |
| Q1 2026 | 59 | 35 |
| Q2 2026 | 58 | 43 |
Calls vs puts
Options held, notional value, last 4 quarters. P/C = puts ÷ calls
Numbers
| Quarter | Calls | Puts | P/C |
|---|---|---|---|
| Q3 2025 | $372.5k | $610.1k | 1.64 |
| Q4 2025 | $96.4k | $4.2m | 43.96 |
| Q1 2026 | $595 | $2.6m | 4344.00 |
| Q2 2026 | $837.8k | $630.7k | 0.75 |
Biggest buyers
| MPM BIOIMPACT LLC | New | +4.5m |
| BlackRock, Inc. | Added | +3.2m |
| Saturn V Capital Management LP | Added | +1.4m |
| ADAR1 Capital Management, LLC | Added | +1.1m |
| GEODE CAPITAL MANAGEMENT, LLC | Added | +1.1m |
| STATE STREET CORP | Added | +806.7k |
| Vestal Point Capital, LP | Added | +663.0k |
| QVT Financial LP | Added | +584.6k |
| GOLDMAN SACHS GROUP INC | Added | +421.0k |
| VANGUARD PORTFOLIO MANAGEMENT LLC | New | +407.5k |
Biggest sellers
| Pfizer Inc | Reduced | -2.3m |
| Cormorant Asset Management, LP | Sold out | -1.4m |
| MILLENNIUM MANAGEMENT LLC | Reduced | -1.4m |
| Affinity Asset Advisors, LLC | Reduced | -1.1m |
| Point72 Asset Management, L.P. | Sold out | -872.7k |
| MARSHALL WACE, LLP | Sold out | -852.3k |
| SILVERARC CAPITAL MANAGEMENT, LLC | Sold out | -560.7k |
| Qube Research & Technologies Ltd | Sold out | -450.3k |
| MORGAN STANLEY | Reduced | -367.0k |
| JANE STREET GROUP, LLC | Sold out | -278.9k |
Biggest calls
| SUSQUEHANNA INTERNATIONAL GROUP, LLP | New | $516.8k87.6k shares |
| JANE STREET GROUP, LLC | New | $180.5k30.6k shares |
| SIMPLEX TRADING, LLC | Added | $140.4k23.8k shares |
Biggest puts
| SIMPLEX TRADING, LLC | Reduced | $349.3k59.2k shares |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP | Reduced | $281.4k47.7k shares |
Options at notional value: the value of the shares the contracts control, as filers report them, not what the options cost. Not included in the holders, shares or buying above.
Major shareholders (over 5%)
Anyone who owns more than 5% of a class of the company's shares has to say so: on Schedule 13D if they may try to influence or control the company, on 13G if they're a passive investor, and update it as the stake changes. Each holder's latest filing, from 19 Dec 2024 on; percentages are of the share class, as the holder worked them out.
| Holder | Stake |
|---|---|
| AI Biotechnology LLC 13D · may seek influence -1.7 pts · filed 2026-03-02 | 18.2% |
Athanor Capital
13D · may seek influence
no change · filed 2026-01-27
Stated purposeThe securities reported herein were acquired by the Reporting Persons for investment purposes in the ordinary course of business. The Reporting Persons acquired the securities without the purpose or effect of changing or influencing the control of the Issuer and do not have any present plans or proposals that relate to or would result in any of the actions described in Items 4(a) through 4(j) of Schedule 13D. The Reporting Persons may, from time to time, review their investment in the Issuer and may engage in discussions with management or the board of directors of the Issuer regarding the Issuer's business, operations and prospects, subject to applicable law. The Reporting Persons reserve the right to determine in the future whether to change the purpose or purposes described above or wh… Full filing |
15.7% |
| Venrock Healthcare Capital Partners III, L.P. 13G · passive investor no change · filed 2026-05-15 | 9.9% |
| SUVRETTA CAPITAL MANAGEMENT, LLC 13G · passive investor +1.3 pts · filed 2026-05-12 | 9.9% |
Fell to 5% or below in the last year: GREAT POINT PARTNERS LLC (4.4%, 2026-05-15), JPMORGAN CHASE & CO (4.7%, 2026-05-06), Deep Track Capital, LP (0.4%, 2025-11-14)
Insider purchases and sales since 1 Apr 2026
Shares bought or sold by the company's own officers, directors and 10% owners, in the open market or privately, as they reported to the SEC on Form 4 (due within two business days of the trade). Grants, option exercises, shares withheld for tax and gifts aren't included.
Officers and directors buying vs selling
Number of people, by quarter (10% owners not included)
Numbers
| Quarter | Buying | Bought | Selling | Sold | Sold under a plan |
|---|---|---|---|---|---|
| Q4 2024 | 0 | — | 1 | $2.7m | — |
| Q1 2025 | 0 | — | 0 | — | — |
| Q2 2025 | 0 | — | 0 | — | — |
| Q3 2025 | 0 | — | 0 | — | — |
| Q4 2025 | 0 | — | 0 | — | — |
| Q1 2026 | 0 | — | 0 | — | — |
| Q2 2026 | 0 | — | 0 | — | — |
| Q3 2026 | 0 | — | 0 | — | — |
None reported since 1 Apr 2026.
Holders, Q2 2026
| Manager | Shares | Change |
|---|---|---|
| MONTANOVA CAPITAL, LLC 1.17% of their portfolio | 9.4m $55.7m | Added +376.0k |
| Venrock Adviser, LLC 1.15% of their portfolio | 6.4m $38.0m | Unchanged |
| MPM BIOIMPACT LLC 1.61% of their portfolio | 4.5m $26.4m | New |
| JPMORGAN CHASE & CO 0.00% of their portfolio | 4.4m $24.5m | Reduced -104.1k |
| GREAT POINT PARTNERS LLC 5.86% of their portfolio | 4.2m $24.9m | Unchanged |
| BRAIDWELL LP 0.87% of their portfolio | 4.0m $23.5m | Reduced -8.7k |
| Siren, L.L.C. 0.45% of their portfolio | 3.7m $22.0m | Unchanged |
| BlackRock, Inc. 0.00% of their portfolio | 3.6m $21.3m | Added +3.2m |
| Commodore Capital LP 1.14% of their portfolio | 3.2m $19.2m | Unchanged |
| ADAGE CAPITAL PARTNERS GP, L.L.C. 0.02% of their portfolio | 2.8m $16.2m | Unchanged |
| Saturn V Capital Management LP 1.78% of their portfolio | 2.1m $12.4m | Added +1.4m |
| QVT Financial LP 0.72% of their portfolio | 1.9m $11.2m | Added +584.6k |
| ADAR1 Capital Management, LLC 0.49% of their portfolio | 1.8m $10.4m | Added +1.1m |
| ARMISTICE CAPITAL, LLC 0.27% of their portfolio | 1.6m $9.7m | Added +129.0k |
| GEODE CAPITAL MANAGEMENT, LLC 0.00% of their portfolio | 1.6m $9.3m | Added +1.1m |
| Affinity Asset Advisors, LLC 0.42% of their portfolio | 1.5m $8.6m | Reduced -1.1m |
| STEMPOINT CAPITAL LP 1.40% of their portfolio | 1.4m $8.1m | Reduced -138.8k |
| Ikarian Capital, LLC 1.18% of their portfolio | 1.2m $7.2m | Added +25.0k |
| EcoR1 Capital, LLC 0.35% of their portfolio | 1.2m $7.0m | Unchanged |
| Vestal Point Capital, LP 0.16% of their portfolio | 1.2m $6.9m | Added +663.0k |
| STATE STREET CORP 0.00% of their portfolio | 1.0m $5.9m | Added +806.7k |
| Boxer Capital Management, LLC 0.40% of their portfolio | 900.0k $5.3m | Unchanged |
| VANGUARD CAPITAL MANAGEMENT LLC 0.00% of their portfolio | 747.4k $4.4m | Added +260.5k |
| GOLDMAN SACHS GROUP INC 0.00% of their portfolio | 573.9k $3.4m | Added +421.0k |
| Pfizer Inc 1.69% of their portfolio | 538.8k $2.9m | Reduced -2.3m |
| FMR LLC 0.00% of their portfolio | 528.3k $3.1m | Reduced -1.1k |
| MORGAN STANLEY 0.00% of their portfolio | 506.0k $3.0m | Reduced -367.0k |
| NORTHERN TRUST CORP 0.00% of their portfolio | 500.1k $3.0m | Added +396.0k |
| Foresite Capital Management VI LLC 0.41% of their portfolio | 450.0k $2.7m | Unchanged |
| VANGUARD PORTFOLIO MANAGEMENT LLC 0.00% of their portfolio | 407.5k $2.4m | New |
| VANGUARD FIDUCIARY TRUST CO 0.00% of their portfolio | 406.4k $2.4m | Added +174.6k |
| BOOTHBAY FUND MANAGEMENT, LLC 0.04% of their portfolio | 379.2k $2.2m | Added +4.7k |
| KVP Capital Advisors, LP 1.62% of their portfolio | 373.1k $2.2m | Unchanged |
| TWO SIGMA INVESTMENTS, LP 0.00% of their portfolio | 350.9k $2.1m | Added +32.7k |
| RENAISSANCE TECHNOLOGIES LLC 0.00% of their portfolio | 321.7k $1.9m | Added +8.4k |
| CITADEL ADVISORS LLC 0.00% of their portfolio | 300.7k $1.8m | Added +282.8k |
| AMERIPRISE FINANCIAL INC 0.00% of their portfolio | 282.2k $1.7m | Unchanged |
| UBS Group AG 0.00% of their portfolio | 265.3k $1.6m | Added +24.3k |
| Jump Financial, LLC 0.01% of their portfolio | 231.6k $1.4m | Added +203.5k |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC 0.00% of their portfolio | 174.4k $1.0m | Added +143.3k |
| MILLENNIUM MANAGEMENT LLC 0.00% of their portfolio | 137.6k $812.1k | Reduced -1.4m |
| XTX Topco Ltd 0.01% of their portfolio | 136.2k $803.7k | Added +16.5k |
| Alberta Investment Management Corp 0.00% of their portfolio | 133.2k $785.9k | Unchanged |
| Nuveen, LLC 0.00% of their portfolio | 126.2k $744.6k | New |
| Bank of New York Mellon Corp 0.00% of their portfolio | 124.4k $733.8k | New |
| BARCLAYS PLC 0.00% of their portfolio | 105.7k $623.9k | Reduced -64.1k |
| BANK OF AMERICA CORP /DE/ 0.00% of their portfolio | 97.0k $572.5k | Reduced -39.5k |
| ALPS ADVISORS INC 0.00% of their portfolio | 96.4k $568.8k | Added +26.2k |
| BRIDGEWAY CAPITAL MANAGEMENT, LLC 0.01% of their portfolio | 85.3k $503.6k | Unchanged |
| Verdad Advisers, LP 0.38% of their portfolio | 66.9k $394.8k | Reduced -30.2k |
| RHUMBLINE ADVISERS 0.00% of their portfolio | 65.9k $388.7k | New |
| BNP PARIBAS FINANCIAL MARKETS 0.00% of their portfolio | 59.4k $350.7k | Added +52.1k |
| DEUTSCHE BANK AG\ 0.00% of their portfolio | 58.6k $346.0k | New |
| RBF Capital, LLC 0.01% of their portfolio | 58.2k $343.3k | Unchanged |
| DIMENSIONAL FUND ADVISORS LP 0.00% of their portfolio | 55.1k $325.3k | Added +12.0k |
| WELLS FARGO & COMPANY/MN 0.00% of their portfolio | 53.8k $317.3k | New |
| PRICE T ROWE ASSOCIATES INC /MD/ 0.00% of their portfolio | 48.4k $286.0k | New |
| AMERICAN CENTURY COMPANIES INC 0.00% of their portfolio | 40.5k $238.7k | Added +6.7k |
| WELLINGTON MANAGEMENT GROUP LLP 0.00% of their portfolio | 38.8k $228.9k | Reduced -77.9k |
| MetLife Investment Management, LLC 0.00% of their portfolio | 36.7k $216.8k | New |
| Invesco Ltd. 0.00% of their portfolio | 32.0k $189.0k | New |
| ALLIANCEBERNSTEIN L.P. 0.00% of their portfolio | 31.7k $188.9k | New |
| RAYMOND JAMES FINANCIAL INC 0.00% of their portfolio | 28.8k $170.0k | Added +1.9k |
| EntryPoint Capital, LLC 0.04% of their portfolio | 28.8k $170.0k | New |
| CITIGROUP INC 0.00% of their portfolio | 27.8k $163.8k | Added +18.4k |
| Squarepoint Ops LLC 0.00% of their portfolio | 27.2k $160.3k | Reduced -17.8k |
| MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd. 0.00% of their portfolio | 27.0k $159.5k | New |
| Forefront Analytics, LLC 0.17% of their portfolio | 27.0k $159.1k | Added +12.1k |
| Mariner, LLC 0.00% of their portfolio | 23.1k $136.3k | Reduced -1.6k |
| INSIGNEO ADVISORY SERVICES, LLC 0.00% of their portfolio | 20.6k $121.8k | Reduced -5.0k |
| Police & Firemen's Retirement System of New Jersey 0.00% of their portfolio | 17.4k $102.6k | New |
| MANUFACTURERS LIFE INSURANCE COMPANY, THE 0.00% of their portfolio | 17.0k $100.5k | New |
| LOS ANGELES CAPITAL MANAGEMENT LLC 0.00% of their portfolio | 16.9k $99.8k | New |
| Vanguard Global Advisers, LLC 0.00% of their portfolio | 16.8k $99.2k | Unchanged |
| China Universal Asset Management Co., Ltd. 0.01% of their portfolio | 16.0k $94.4k | Reduced -5.6k |
| Abel Hall, LLC 0.01% of their portfolio | 13.2k $78.1k | Added +40 |
| NEW YORK STATE COMMON RETIREMENT FUND 0.00% of their portfolio | 13.2k $77.9k | New |
| VOYA INVESTMENT MANAGEMENT LLC 0.00% of their portfolio | 11.6k $68.5k | New |
| State of Wyoming 0.01% of their portfolio | 9.9k $58.3k | Added +9.8k |
| Allworth Financial LP 0.00% of their portfolio | 5.8k $34.1k | Reduced -7.5k |
| Legal & General Group Plc 0.00% of their portfolio | 5.7k $33.8k | New |
| Ameritas Investment Partners, Inc. 0.00% of their portfolio | 5.3k $31.6k | New |
| Russell Investments Group, Ltd. 0.00% of their portfolio | 4.7k $27.8k | New |
| Tower Research Capital LLC (TRC) 0.00% of their portfolio | 3.4k $20.0k | New |
| ROYAL BANK OF CANADA 0.00% of their portfolio | 2.8k $17.0k | New |
| SIMPLEX TRADING, LLC 0.00% of their portfolio | 2.6k $15.6k | Reduced -15.9k |
| Steward Partners Investment Advisory, LLC 0.00% of their portfolio | 1.0k $5.9k | Unchanged |
| CALIFORNIA STATE TEACHERS RETIREMENT SYSTEM 0.00% of their portfolio | 812 $4.8k | New |
| NISA INVESTMENT ADVISORS, LLC 0.00% of their portfolio | 702 $4.1k | Unchanged |
| Quarry LP 0.00% of their portfolio | 323 $1.9k | New |
| US BANCORP \DE\ 0.00% of their portfolio | 318 $1.9k | Unchanged |
| Sterling Capital Management LLC 0.00% of their portfolio | 207 $1.2k | New |
| SBI Securities Co., Ltd. 0.00% of their portfolio | 77 $454 | Reduced -29 |
| Caitong International Asset Management Co., Ltd 0.00% of their portfolio | 50 $295 | Added +49 |
| Arax Advisory Partners 0.00% of their portfolio | 24 $142 | Unchanged |