CULLINAN THERAPEUTICS INC CGEM
COM · Common Stock · CUSIP 230031106 · ISIN US2300311063
- SectorHealth care
- IndustryBiological Products, (No Diagnostic Substances)
- HeadquartersCambridge, MA
- 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 ($29.4k this quarter). Holder counts are more reliable. Shares outstanding: 58.0m as of 2024-07-31, 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 ≈ $17.44. Options: 6 managers hold calls ($3.1m notional), 3 hold puts ($286.0k).
Trends to Q2 2024
Institutional holders
Managers reporting a position, each quarter
Numbers
| Quarter | Holders |
|---|---|
| Q3 2022 | 100 |
| Q4 2022 | 98 |
| Q1 2023 | 104 |
| Q2 2023 | 107 |
| Q3 2023 | 107 |
| Q4 2023 | 114 |
| Q1 2024 | 114 |
| Q2 2024 | 136 |
Buyers vs sellers
Managers adding to or starting a position, vs cutting or selling out
Numbers
| Quarter | Bought or added | Cut or sold out |
|---|---|---|
| Q4 2022 | 52 | 36 |
| Q1 2023 | 49 | 43 |
| Q2 2023 | 51 | 59 |
| Q3 2023 | 48 | 44 |
| Q4 2023 | 65 | 39 |
| Q1 2024 | 59 | 55 |
| Q2 2024 | 97 | 42 |
Calls vs puts
Options held, notional value, last 4 quarters. P/C = puts ÷ calls
Numbers
| Quarter | Calls | Puts | P/C |
|---|---|---|---|
| Q3 2023 | $79.8k | $560.2k | 7.02 |
| Q4 2023 | $96.7k | $109.8k | 1.13 |
| Q1 2024 | $214.7k | $157.6k | 0.73 |
| Q2 2024 | $3.1m | $286.0k | 0.09 |
Biggest buyers
| BVF INC/IL | Added | +2.6m |
| DEERFIELD MANAGEMENT COMPANY, L.P. | Added | +2.1m |
| ALLIANCEBERNSTEIN L.P. | Added | +1.7m |
| Avidity Partners Management LP | New | +1.6m |
| Venrock Adviser, LLC | New | +1.4m |
| Holocene Advisors, LP | New | +1.3m |
| ADAGE CAPITAL PARTNERS GP, L.L.C. | Added | +1.3m |
| MARSHALL WACE, LLP | Added | +1.1m |
| Cormorant Asset Management, LP | New | +1.1m |
| BlackRock Inc. | Added | +1.1m |
Biggest sellers
| MORGAN STANLEY | Reduced | -2.6m |
| BRAIDWELL LP | Reduced | -1.1m |
| Blue Owl Capital Holdings LP | Reduced | -875.7k |
| Logos Global Management LP | Sold out | -700.0k |
| Rubric Capital Management LP | Sold out | -626.9k |
| FRANKLIN RESOURCES INC | Reduced | -252.6k |
| DIMENSIONAL FUND ADVISORS LP | Reduced | -233.6k |
| Parkman Healthcare Partners LLC | Sold out | -178.4k |
| KENNEDY CAPITAL MANAGEMENT LLC | Sold out | -84.2k |
| CITIGROUP INC | Reduced | -63.5k |
Biggest calls
| JANE STREET GROUP, LLC | New | $1.3m74.9k shares |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP | New | $751.7k43.1k shares |
| CITADEL ADVISORS LLC | Added | $594.7k34.1k shares |
| SIMPLEX TRADING, LLC | New | $476.0k27.3k shares |
| GROUP ONE TRADING LLC | New | $12.2k700 shares |
| CONCOURSE FINANCIAL GROUP SECURITIES, INC. | Unchanged | $00 shares |
Biggest puts
| CITADEL ADVISORS LLC | Added | $277.3k15.9k shares |
| GROUP ONE TRADING LLC | Reduced | $8.7k500 shares |
| 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 |
|---|---|
| BIOTECHNOLOGY VALUE FUND L P 13G · passive investor no change · filed 2026-08-14 | 10.0% |
| Lynx1 Capital Management LP 13G · passive investor -4.7 pts · filed 2025-11-14 | 9.8% |
| PRICE T ROWE ASSOCIATES INC /MD/ 13G · institution new · filed 2026-08-14 | 6.2% |
| STATE STREET CORP 13G · institution new · filed 2026-08-07 | 6.0% |
| Kynam Capital Management, LP 13G · institution new · filed 2026-03-04 | 5.3% |
Fell to 5% or below in the last year: VANGUARD GROUP INC (0.0%, 2026-03-26), CITADEL ADVISORS LLC (3.4%, 2025-11-14), Flynn James E (5.0%, 2025-11-13)
Insider purchases and sales in Q2 2024
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 2022 | 0 | — | 2 | $1.0m | — |
| Q4 2022 | 0 | — | 1 | $53.2k | — |
| Q1 2023 | 0 | — | 5 | $22.5k | — |
| Q2 2023 | 0 | — | 5 | $229.4k | $147.7k |
| Q3 2023 | 0 | — | 0 | — | — |
| Q4 2023 | 0 | — | 5 | $127.4k | — |
| Q1 2024 | 0 | — | 1 | $1.7m | $1.7m |
| Q2 2024 | 0 | — | 1 | $1.8m | $1.8m |
| Date | Insider | Trade | Value |
|---|---|---|---|
| 2024-05-07 | Michaelson Jennifer Chief Scientific Officer | Sold plan | $168.5k5.6k shares |
| 2024-05-06 | Michaelson Jennifer Chief Scientific Officer | Sold plan | $1.6m58.0k shares |
Their holding: how much the trade added to or took from the insider's holding (direct, or the trust or fund named). The same trade is sometimes reported by more than one insider, such as a fund and the director who represents it; totals count it once. A value is left blank where the reported price is far from the market price (usually a typo).
Holders, Q2 2024
| Manager | Shares | Change |
|---|---|---|
| MPM BIOIMPACT LLC 20.73% of their portfolio | 7.6m $133.4m | Unchanged |
| BVF INC/IL 2.81% of their portfolio | 5.8m $100.3m | Added +2.6m |
| BlackRock Inc. 0.00% of their portfolio | 3.6m $61.9m | Added +1.1m |
| DEERFIELD MANAGEMENT COMPANY, L.P. 0.95% of their portfolio | 3.3m $57.2m | Added +2.1m |
| VANGUARD GROUP INC 0.00% of their portfolio | 2.9m $50.1m | Added +1.1m |
| FRANKLIN RESOURCES INC 0.01% of their portfolio | 2.4m $42.6m | Reduced -252.6k |
| ADAGE CAPITAL PARTNERS GP, L.L.C. 0.07% of their portfolio | 2.2m $38.9m | Added +1.3m |
| Blue Owl Capital Holdings LP 9.94% of their portfolio | 2.0m $35.7m | Reduced -875.7k |
| CITADEL ADVISORS LLC 0.03% of their portfolio | 1.9m $33.9m | Added +834.0k |
| STATE STREET CORP 0.00% of their portfolio | 1.9m $33.9m | Added +515.7k |
| ALLIANCEBERNSTEIN L.P. 0.01% of their portfolio | 1.7m $30.1m | Added +1.7m |
| Avidity Partners Management LP 1.16% of their portfolio | 1.6m $27.2m | New |
| Paradigm Biocapital Advisors LP 1.03% of their portfolio | 1.5m $26.9m | Added +194.8k |
| Venrock Adviser, LLC 1.53% of their portfolio | 1.4m $24.1m | New |
| Holocene Advisors, LP 0.10% of their portfolio | 1.3m $23.0m | New |
| Nextech Invest Ltd. 3.58% of their portfolio | 1.2m $21.3m | Unchanged |
| MARSHALL WACE, LLP 0.03% of their portfolio | 1.2m $20.6m | Added +1.1m |
| ORBIMED ADVISORS LLC 0.40% of their portfolio | 1.1m $20.0m | Added +630.0k |
| Cormorant Asset Management, LP 1.14% of their portfolio | 1.1m $19.6m | New |
| Artal Group S.A. 0.47% of their portfolio | 1.1m $18.5m | New |
| RTW INVESTMENTS, LP 0.28% of their portfolio | 1.1m $18.4m | New |
| GEODE CAPITAL MANAGEMENT, LLC 0.00% of their portfolio | 976.5k $17.0m | Added +299.2k |
| TANG CAPITAL MANAGEMENT LLC 1.64% of their portfolio | 921.1k $16.1m | Added +350.0k |
| MORGAN STANLEY 0.00% of their portfolio | 838.3k $14.6m | Reduced -2.6m |
| DIMENSIONAL FUND ADVISORS LP 0.00% of their portfolio | 759.8k $13.2m | Reduced -233.6k |
| PERCEPTIVE ADVISORS LLC 0.32% of their portfolio | 749.9k $13.1m | New |
| Rock Springs Capital Management LP 0.35% of their portfolio | 658.3k $11.5m | New |
| Foresite Capital Management V, LLC 7.33% of their portfolio | 657.9k $11.5m | New |
| Boxer Capital, LLC 0.60% of their portfolio | 657.9k $11.5m | New |
| TWIN FOCUS CAPITAL PARTNERS, LLC 1.66% of their portfolio | 595.5k $10.4m | New |
| DEUTSCHE BANK AG\ 0.00% of their portfolio | 555.1k $9.7m | Added +5.8k |
| GOLDMAN SACHS GROUP INC 0.00% of their portfolio | 452.8k $7.9m | Added +283.4k |
| RENAISSANCE TECHNOLOGIES LLC 0.01% of their portfolio | 421.7k $7.4m | Added +100.6k |
| BANK OF AMERICA CORP /DE/ 0.00% of their portfolio | 412.7k $7.2m | Added +281.4k |
| AMERIPRISE FINANCIAL INC 0.00% of their portfolio | 403.9k $7.0m | Reduced -16.3k |
| Lynx1 Capital Management LP 2.37% of their portfolio | 377.3k $6.6m | New |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC 0.00% of their portfolio | 370.6k $6.5m | Added +112.8k |
| CenterBook Partners LP 0.37% of their portfolio | 341.3k $6.0m | New |
| NORTHERN TRUST CORP 0.00% of their portfolio | 296.9k $5.2m | Added +32.9k |
| PFM Health Sciences, LP 0.28% of their portfolio | 296.0k $5.2m | Added +40.1k |
| Affinity Asset Advisors, LLC 0.72% of their portfolio | 263.8k $4.6m | Added +5.2k |
| Nuveen Asset Management, LLC 0.00% of their portfolio | 217.8k $3.8m | Added +124.5k |
| D. E. Shaw & Co., Inc. 0.01% of their portfolio | 212.4k $3.7m | Added +150.8k |
| BARCLAYS PLC 0.00% of their portfolio | 197.3k $3.4m | Added +157.1k |
| Qube Research & Technologies Ltd 0.01% of their portfolio | 190.5k $3.3m | Added +75.4k |
| BRAIDWELL LP 0.10% of their portfolio | 176.2k $3.1m | Reduced -1.1m |
| VOLORIDGE INVESTMENT MANAGEMENT, LLC 0.01% of their portfolio | 163.0k $2.8m | New |
| UBS Group AG 0.00% of their portfolio | 160.0k $2.8m | Reduced -6.8k |
| Balyasny Asset Management L.P. 0.01% of their portfolio | 150.7k $2.6m | New |
| Ensign Peak Advisors, Inc 0.00% of their portfolio | 148.8k $2.6m | New |
| Bank of New York Mellon Corp 0.00% of their portfolio | 138.0k $2.4m | Added +43.8k |
| FIRST TRUST ADVISORS LP 0.00% of their portfolio | 136.9k $2.4m | Added +41.1k |
| Assenagon Asset Management S.A. 0.00% of their portfolio | 114.2k $2.0m | New |
| Rafferty Asset Management, LLC 0.01% of their portfolio | 104.7k $1.8m | Added +7.6k |
| JACOBS LEVY EQUITY MANAGEMENT, INC 0.01% of their portfolio | 98.3k $1.7m | New |
| JANE STREET GROUP, LLC 0.00% of their portfolio | 96.6k $1.7m | Added +75.6k |
| Walleye Capital LLC 0.02% of their portfolio | 92.9k $1.6m | New |
| SG Americas Securities, LLC 0.01% of their portfolio | 85.2k $1.5m | Added +75.2k |
| AMERICAN CENTURY COMPANIES INC 0.00% of their portfolio | 76.0k $1.3m | Added +18.8k |
| E Fund Management Co., Ltd. 0.07% of their portfolio | 74.8k $1.3m | New |
| Swiss National Bank 0.00% of their portfolio | 73.6k $1.3m | Added +27.3k |
| WELLINGTON MANAGEMENT GROUP LLP 0.00% of their portfolio | 72.1k $1.3m | Added +3.7k |
| UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC 0.00% of their portfolio | 68.5k $1.2m | New |
| OCONNOR, A Distinct Business Unit of UBS ASSET MANAGEMENT AMERICAS (LLC) 0.03% of their portfolio | 62.0k $1.1m | Added +2.6k |
| TWO SIGMA INVESTMENTS, LP 0.00% of their portfolio | 57.4k $1.0m | New |
| RHUMBLINE ADVISERS 0.00% of their portfolio | 54.4k $947.9k | Added +7.6k |
| ADAR1 Capital Management, LLC 0.19% of their portfolio | 53.3k $928.9k | New |
| Invesco Ltd. 0.00% of their portfolio | 49.4k $860.9k | Added +2.0k |
| JPMORGAN CHASE & CO 0.00% of their portfolio | 46.5k $811.6k | Added +7.6k |
| Birchview Capital, LP 0.32% of their portfolio | 40.0k $697.6k | Reduced -10.2k |
| ALGERT GLOBAL LLC 0.02% of their portfolio | 39.9k $695.6k | Reduced -39.8k |
| Legal & General Group Plc 0.00% of their portfolio | 39.3k $684.5k | Added +19.7k |
| Jump Financial, LLC 0.01% of their portfolio | 37.5k $653.3k | Added +15.8k |
| CALIFORNIA STATE TEACHERS RETIREMENT SYSTEM 0.00% of their portfolio | 36.7k $639.3k | Added +12.9k |
| Russell Investments Group, Ltd. 0.00% of their portfolio | 34.3k $598.1k | New |
| STRS OHIO 0.00% of their portfolio | 34.1k $594.7k | Added +2.2k |
| SHERBROOKE PARK ADVISERS LLC 0.08% of their portfolio | 26.0k $453.0k | New |
| NEOS Investment Management LLC 0.02% of their portfolio | 24.0k $419.0k | Added +7.6k |
| MetLife Investment Management, LLC 0.00% of their portfolio | 22.7k $396.3k | Added +9.4k |
| CITIGROUP INC 0.00% of their portfolio | 22.1k $385.5k | Reduced -63.5k |
| TWO SIGMA ADVISERS, LP 0.00% of their portfolio | 20.8k $362.8k | Added +1.2k |
| PRICE T ROWE ASSOCIATES INC /MD/ 0.00% of their portfolio | 20.8k $363.0k | Reduced -2.0k |
| Corebridge Financial, Inc. 0.00% of their portfolio | 20.8k $362.7k | First filing |
| PROFUND ADVISORS LLC 0.01% of their portfolio | 19.4k $337.5k | Added +4.1k |
| JANUS HENDERSON GROUP PLC 0.00% of their portfolio | 18.5k $322.7k | New |
| Y-Intercept (Hong Kong) Ltd 0.02% of their portfolio | 18.0k $314.4k | New |
| HARBOR CAPITAL ADVISORS, INC. 0.02% of their portfolio | 17.5k $305.0k | Added +4.9k |
| MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd. 0.00% of their portfolio | 17.0k $294.3k | First filing |
| Mariner, LLC 0.00% of their portfolio | 16.4k $285.2k | New |
| STATE OF WISCONSIN INVESTMENT BOARD 0.00% of their portfolio | 16.2k $283.3k | Reduced -3.8k |
| NEW YORK STATE COMMON RETIREMENT FUND 0.00% of their portfolio | 15.8k $275.9k | Added +6.3k |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP 0.00% of their portfolio | 15.5k $270.1k | Reduced -19.1k |
| MANUFACTURERS LIFE INSURANCE COMPANY, THE 0.00% of their portfolio | 15.2k $264.7k | Added +4.4k |
| COMMONWEALTH EQUITY SERVICES, LLC 0.00% of their portfolio | 14.6k $255.0k | Reduced -100 |
| MARTINGALE ASSET MANAGEMENT L P 0.01% of their portfolio | 14.0k $244.5k | Reduced -28.5k |
| WELLS FARGO & COMPANY/MN 0.00% of their portfolio | 13.9k $242.3k | Added +4.7k |
| Nebula Research & Development LLC 0.04% of their portfolio | 13.1k $228.9k | Reduced -11.5k |
| VOYA INVESTMENT MANAGEMENT LLC 0.00% of their portfolio | 13.0k $226.2k | New |
| EXCHANGE TRADED CONCEPTS, LLC 0.01% of their portfolio | 12.9k $224.1k | Reduced -4.0k |
| Alpine Global Management, LLC 0.04% of their portfolio | 12.2k $212.1k | New |