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 ($55.3k this quarter). Holder counts are more reliable. Shares outstanding: 65.0m as of 2025-08-04, 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 ≈ $1.05. Options: 1 managers hold calls ($0 notional), 1 hold puts ($0).
Trends to Q2 2025
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 |
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 2023 | 28 | 9 |
| Q4 2023 | 34 | 9 |
| Q1 2024 | 19 | 24 |
| Q2 2024 | 36 | 16 |
| Q3 2024 | 53 | 13 |
| Q4 2024 | 51 | 24 |
| Q1 2025 | 29 | 38 |
| Q2 2025 | 33 | 49 |
Calls vs puts
Options held, notional value, last 4 quarters. P/C = puts ÷ calls
Numbers
| Quarter | Calls | Puts | P/C |
|---|---|---|---|
| Q3 2024 | $1.2m | $1.1m | 0.91 |
| Q4 2024 | $522.0k | $290.5k | 0.56 |
| Q1 2025 | $258 | $15.5k | 60.00 |
| Q2 2025 | $0 | $0 | — |
Biggest buyers
| JPMORGAN CHASE & CO | Added | +2.1m |
| FMR LLC | Added | +566.5k |
| MILLENNIUM MANAGEMENT LLC | Added | +485.7k |
| GOLDMAN SACHS GROUP INC | Added | +179.7k |
| MORGAN STANLEY | Added | +165.3k |
| TWO SIGMA INVESTMENTS, LP | Added | +150.9k |
| Alberta Investment Management Corp | New | +133.2k |
| RBF Capital, LLC | New | +120.0k |
| Y-Intercept (Hong Kong) Ltd | New | +107.9k |
| JANE STREET GROUP, LLC | New | +107.7k |
Biggest sellers
| RA CAPITAL MANAGEMENT, L.P. | Sold out | -3.2m |
| Allostery Investments LP | Sold out | -2.3m |
| BlackRock, Inc. | Reduced | -2.1m |
| ADAR1 Capital Management, LLC | Reduced | -1.8m |
| Deep Track Capital, LP | Reduced | -1.6m |
| GEODE CAPITAL MANAGEMENT, LLC | Reduced | -585.8k |
| Woodline Partners LP | Sold out | -520.3k |
| SPHERA FUNDS MANAGEMENT LTD. | Sold out | -421.2k |
| Venrock Adviser, LLC | Reduced | -391.9k |
| STATE STREET CORP | Reduced | -377.9k |
Biggest calls
| CONCOURSE FINANCIAL GROUP SECURITIES, INC. | Unchanged | $00 shares |
Biggest puts
| CONCOURSE FINANCIAL GROUP SECURITIES, INC. | Unchanged | $00 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 in Q2 2025
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 |
|---|---|---|---|---|---|
| Q3 2023 | 0 | — | 0 | — | — |
| Q4 2023 | 0 | — | 1 | $8.0m | — |
| Q1 2024 | 0 | — | 0 | — | — |
| Q2 2024 | 1 | $496.0k | 0 | — | — |
| Q3 2024 | 0 | — | 2 | $10.5m | — |
| Q4 2024 | 0 | — | 1 | $2.7m | — |
| Q1 2025 | 0 | — | 0 | — | — |
| Q2 2025 | 0 | — | 0 | — | — |
None reported in Q2 2025.
Holders, Q2 2025
| Manager | Shares | Change |
|---|---|---|
| MONTANOVA CAPITAL, LLC 0.19% of their portfolio | 4.9m $5.1m | Unchanged |
| JPMORGAN CHASE & CO 0.00% of their portfolio | 4.7m $4.9m | Added +2.1m |
| Venrock Adviser, LLC 0.36% of their portfolio | 4.6m $4.9m | Reduced -391.9k |
| GREAT POINT PARTNERS LLC 2.16% of their portfolio | 3.2m $3.3m | Unchanged |
| Pfizer Inc 0.54% of their portfolio | 3.0m $3.1m | Unchanged |
| BRAIDWELL LP 0.09% of their portfolio | 2.5m $2.6m | Unchanged |
| Point72 Asset Management, L.P. 0.01% of their portfolio | 2.4m $2.5m | Unchanged |
| Deep Track Capital, LP 0.06% of their portfolio | 1.7m $1.8m | Reduced -1.6m |
| ARMISTICE CAPITAL, LLC 0.06% of their portfolio | 1.5m $1.6m | Unchanged |
| ADAR1 Capital Management, LLC 0.17% of their portfolio | 997.5k $1.0m | Reduced -1.8m |
| MILLENNIUM MANAGEMENT LLC 0.00% of their portfolio | 789.3k $828.8k | Added +485.7k |
| BlackRock, Inc. 0.00% of their portfolio | 578.1k $607.0k | Reduced -2.1m |
| FMR LLC 0.00% of their portfolio | 569.1k $597.6k | Added +566.5k |
| VANGUARD GROUP INC 0.00% of their portfolio | 517.1k $543.0k | Reduced -325.0k |
| GEODE CAPITAL MANAGEMENT, LLC 0.00% of their portfolio | 407.2k $427.7k | Reduced -585.8k |
| GOLDMAN SACHS GROUP INC 0.00% of their portfolio | 302.7k $317.8k | Added +179.7k |
| MORGAN STANLEY 0.00% of their portfolio | 249.2k $261.7k | Added +165.3k |
| TWO SIGMA INVESTMENTS, LP 0.00% of their portfolio | 244.9k $257.2k | Added +150.9k |
| Affinity Asset Advisors, LLC 0.03% of their portfolio | 223.3k $234.5k | Unchanged |
| RENAISSANCE TECHNOLOGIES LLC 0.00% of their portfolio | 204.1k $214.3k | Reduced -218.1k |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC 0.00% of their portfolio | 169.2k $177.6k | Reduced -119.4k |
| AQR CAPITAL MANAGEMENT LLC 0.00% of their portfolio | 156.3k $164.1k | Added +100.6k |
| STATE STREET CORP 0.00% of their portfolio | 144.4k $151.6k | Reduced -377.9k |
| Alberta Investment Management Corp 0.00% of their portfolio | 133.2k $139.9k | New |
| RBF Capital, LLC 0.01% of their portfolio | 120.0k $126.0k | New |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP 0.00% of their portfolio | 118.2k $124.1k | Added +53.2k |
| RAYMOND JAMES FINANCIAL INC 0.00% of their portfolio | 114.2k $119.9k | Reduced -30.5k |
| Y-Intercept (Hong Kong) Ltd 0.00% of their portfolio | 107.9k $113.3k | New |
| JANE STREET GROUP, LLC 0.00% of their portfolio | 107.7k $113.1k | New |
| TWO SIGMA ADVISERS, LP 0.00% of their portfolio | 100.1k $105.1k | Added +13.2k |
| NORTHERN TRUST CORP 0.00% of their portfolio | 94.2k $98.9k | Reduced -275.2k |
| Forefront Analytics, LLC 0.08% of their portfolio | 64.0k $67.2k | Reduced -44.3k |
| Jain Global LLC 0.00% of their portfolio | 48.8k $51.2k | New |
| ACADIAN ASSET MANAGEMENT LLC 0.00% of their portfolio | 44.9k $46.0k | New |
| HRT FINANCIAL LP 0.00% of their portfolio | 32.2k $33.0k | New |
| UBS Group AG 0.00% of their portfolio | 31.2k $32.8k | Reduced -27.6k |
| Point72 Asia (Singapore) Pte. Ltd. 0.01% of their portfolio | 30.6k $32.1k | New |
| Catalyst Funds Management Pty Ltd 0.01% of their portfolio | 23.3k $24.5k | New |
| Tower Research Capital LLC (TRC) 0.00% of their portfolio | 22.0k $23.1k | Added +14.2k |
| Cubist Systematic Strategies, LLC 0.00% of their portfolio | 21.5k $22.6k | New |
| Rangeley Capital, LLC 0.03% of their portfolio | 21.0k $22.1k | New |
| Mariner, LLC 0.00% of their portfolio | 16.4k $17.2k | New |
| BNP PARIBAS FINANCIAL MARKETS 0.00% of their portfolio | 15.6k $16.3k | Added +6.3k |
| Quadrature Capital Ltd 0.00% of their portfolio | 15.2k $15.8k | New |
| CIBC WORLD MARKET INC. 0.00% of their portfolio | 15.0k $15.8k | New |
| IEQ CAPITAL, LLC 0.00% of their portfolio | 13.8k $14.5k | New |
| Abel Hall, LLC 0.01% of their portfolio | 13.3k $14.0k | New |
| Ground Swell Capital, LLC 0.02% of their portfolio | 13.3k $14.0k | New |
| R Squared Ltd 0.01% of their portfolio | 10.2k $10.7k | Not comparable |
| BANK OF AMERICA CORP /DE/ 0.00% of their portfolio | 9.9k $10.4k | Reduced -18.8k |
| CITIGROUP INC 0.00% of their portfolio | 9.2k $9.6k | Reduced -26.8k |
| CWM, LLC 0.00% of their portfolio | 7.0k $7.0k | Added +3.5k |
| MAI Capital Management 0.00% of their portfolio | 4.0k $4.2k | Unchanged |
| CLEAR STREET LLC 0.00% of their portfolio | 1.7k $1.8k | Unchanged |
| JONES FINANCIAL COMPANIES LLLP 0.00% of their portfolio | 1.4k $1.4k | Unchanged |
| NISA INVESTMENT ADVISORS, LLC 0.00% of their portfolio | 1.2k $1.3k | Added +522 |
| Point72 (DIFC) Ltd 0.00% of their portfolio | 601 $631 | New |
| ROYAL BANK OF CANADA 0.00% of their portfolio | 554 $0 | Reduced -91 |
| Essential Partners LLC 0.00% of their portfolio | 510 $536 | First filing |
| WELLS FARGO & COMPANY/MN 0.00% of their portfolio | 385 $404 | Reduced -23.7k |
| True Wealth Design, LLC 0.00% of their portfolio | 382 $402 | Added +287 |
| Clearstead Advisors, LLC 0.00% of their portfolio | 239 $251 | New |
| SBI Securities Co., Ltd. 0.00% of their portfolio | 234 $246 | Reduced -558 |
| BARCLAYS PLC 0.00% of their portfolio | 2 $2 | Reduced -55.8k |
| CONCOURSE FINANCIAL GROUP SECURITIES, INC. — of their portfolio | 0 $0 | Unchanged |