Who owns GMAB
Which tracked institutional funds hold GMAB, how they are positioned, and who is buying versus exiting — from SEC Form 13F-HR filings. See GMAB company fundamentals →
Ownership as of the 2026-Q2 13F filings (latest filed 2026-09-02). 13F is disclosed up to 45 days after quarter-end, so the most recent quarter fills in over the following weeks.
How the tape is positioned
55 tracked funds added or opened GMAB while 31 trimmed or exited it between 2026-Q1 and 2026-Q2 — the tape is split. When large holders disagree on a name, the funds moving first are sometimes ahead of the story.
A prompt to read the filings, not a verdict. 13F is a quarter-end snapshot disclosed up to 45 days late; a fund adds or exits for mandate, benchmark, and timing reasons that have nothing to do with a view on the stock. This is a starting question, not a signal to trade.
Conviction spread
GMAB’s largest tracked holder by dollar value, Paradigm Biocapital Advisors LP, sizes it at 6.8% of its own reported 13F book, while the median holder sizes it at 0.0% of theirs — a 6.7pp conviction gap — its largest holder concentrates the name more heavily than the typical one.
Book-share is each fund’s reported value in GMAB divided by its whole reported 13F book, so it is comparable across funds of different sizes and is unaffected by stock splits. A higher share means a fund has committed more of its book to the name — a starting question about conviction, not a verdict or a signal to trade.
Institutional & insider positioning
Between 2026-Q1 and 2026-Q2, across 280 tracked filers holding GMAB, 151 increased or opened the position and 137 reduced or closed it; over the same quarter, there were no open-market insider Form 4s.
This fuses two public signals for the same quarter — how tracked institutions changed their positions and whether insiders bought or sold in the open market. It describes what was filed; it is a starting question, not a verdict or a signal to trade.
New buyers & exits
Funds opening or closing a position in GMAB between the 2026-Q1 and 2026-Q2 13F filings, and the largest changes among funds holding it in both. New buyers and exits are counted on fund presence (split-invariant); adds and trims are measured on reported value.
New buyers 13
- CITADEL ADVISORS LLC$68M
- Dixon Mitchell Investment Counsel Inc.$11M
- Caption Management, LLC$5M
- Point72 Asset Management, L.P.$4M
- Woodline Partners LP$4M
- IMC-Chicago, LLC$2M
Full exits 13
- INGALLS & SNYDER LLC$2M
- NATIXIS ADVISORS, LLC$2M
- Dorsey Wright & Associates$2M
- Advisors Preferred, LLC$1M
- DIVERSIFY WEALTH MANAGEMENT, LLC$1M
- Y-Intercept (Hong Kong) Ltd$1M
Largest adds
- Paradigm Biocapital Advisors LP$147M
- DEERFIELD MANAGEMENT COMPANY, L.P.$123M
- Sofinnova Investments, Inc.$91M
- Deep Track Capital, LP$57M
- TWO SIGMA INVESTMENTS, LP$34M
- Qube Research & Technologies Ltd$28M
Largest trims
- ALLIANCEBERNSTEIN L.P.$62M
- Orbis Allan Gray Ltd$35M
- RENAISSANCE TECHNOLOGIES LLC$22M
- MORGAN STANLEY$14M
- LPL Financial LLC$1M
- XTX Topco Ltd$1M
Institutional holders
One row per tracked fund, most shares held first (every row is from one quarter; reported value breaks ties). “% of value” is the fund’s share of this security’s tracked institutional value — not of shares outstanding.
| Fund | Shares | Reported value | % of value | Quarter |
|---|---|---|---|---|
| Paradigm Biocapital Advisors LP added | 13,133,131 | $361M | 13.0% | 2026-Q2 |
| Orbis Allan Gray Ltd trimmed | 11,368,161 | $312M | 11.3% | 2026-Q2 |
| ALLIANCEBERNSTEIN L.P. trimmed | 8,644,877 | $232M | 8.4% | 2026-Q2 |
| DEERFIELD MANAGEMENT COMPANY, L.P. added | 6,865,000 | $189M | 6.8% | 2026-Q2 |
| Deep Track Capital, LP added | 5,650,000 | $155M | 5.6% | 2026-Q2 |
| ARROWSTREET CAPITAL, LIMITED PARTNERSHIP | 4,975,324 | $137M | 4.9% | 2026-Q2 |
| BlackRock, Inc. added | 4,671,252 | $128M | 4.6% | 2026-Q2 |
| Sofinnova Investments, Inc. added | 4,045,215 | $111M | 4.0% | 2026-Q2 |
| RENAISSANCE TECHNOLOGIES LLC trimmed | 3,517,850 | $97M | 3.5% | 2026-Q2 |
| TWO SIGMA INVESTMENTS, LP added | 3,506,843 | $96M | 3.5% | 2026-Q2 |
| Harding Loevner LP trimmed | 3,086,318 | $87M | 3.1% | 2026-Q2 |
| FIRST TRUST ADVISORS LP added | 2,756,522 | $76M | 2.7% | 2026-Q2 |
| CITADEL ADVISORS LLC added | 2,475,991 | $68M | 2.5% | 2026-Q2 |
| Qube Research & Technologies Ltd added | 1,689,284 | $46M | 1.7% | 2026-Q2 |
| MORGAN STANLEY trimmed | 1,630,161 | $45M | 1.6% | 2026-Q2 |
| FEDERATED HERMES, INC. added | 1,449,376 | $40M | 1.4% | 2026-Q2 |
| GOLDMAN SACHS GROUP INC added | 1,279,231 | $35M | 1.3% | 2026-Q2 |
| FRANKLIN RESOURCES INC added | 1,202,923 | $33M | 1.2% | 2026-Q2 |
| Pictet Asset Management Holding SA trimmed | 1,065,927 | $29M | 1.1% | 2026-Q2 |
| UBS Group AG added | 961,053 | $26M | 1.0% | 2026-Q2 |
| Perpetual Ltd added | 919,048 | $25M | 0.9% | 2026-Q2 |
| NORTHERN TRUST CORP trimmed | 916,600 | $25M | 0.9% | 2026-Q2 |
| MILLENNIUM MANAGEMENT LLC added | 910,604 | $25M | 0.9% | 2026-Q2 |
| Russell Investments Group, Ltd. added | 883,430 | $24M | 0.9% | 2026-Q2 |
| ENVESTNET ASSET MANAGEMENT INC trimmed | 829,687 | $23M | 0.8% | 2026-Q2 |
| MARSHALL WACE, LLP added | 829,659 | $23M | 0.8% | 2026-Q2 |
| Alyeska Investment Group, L.P. added | 804,374 | $22M | 0.8% | 2026-Q2 |
| FMR LLC trimmed | 764,694 | $21M | 0.8% | 2026-Q2 |
| JPMORGAN CHASE & CO added | 744,815 | $19M | 0.7% | 2026-Q2 |
| AMERICAN CENTURY COMPANIES INC added | 599,953 | $16M | 0.6% | 2026-Q2 |
| CIBC WORLD MARKET INC. added | 514,764 | $14M | 0.5% | 2026-Q2 |
| OPPENHEIMER ASSET MANAGEMENT INC. trimmed | 447,426 | $12M | 0.4% | 2026-Q2 |
| SUPERSTRING CAPITAL MANAGEMENT LP added | 430,600 | $12M | 0.4% | 2026-Q2 |
| MOORE CAPITAL MANAGEMENT, LP added | 420,487 | $12M | 0.4% | 2026-Q2 |
| Dixon Mitchell Investment Counsel Inc. new | 416,000 | $11M | 0.4% | 2026-Q2 |
| Quantinno Capital Management LP added | 333,388 | $9M | 0.3% | 2026-Q2 |
| Hudson Bay Capital Management LP added | 330,000 | $9M | 0.3% | 2026-Q2 |
| SummitTX Capital, L.P. added | 318,408 | $9M | 0.3% | 2026-Q2 |
| WELLS FARGO & COMPANY/MN trimmed | 303,639 | $8M | 0.3% | 2026-Q2 |
| BANK OF AMERICA CORP /DE/ added | 259,249 | $7M | 0.3% | 2026-Q2 |
| EAGLE GLOBAL ADVISORS LLC added | 244,730 | $7M | 0.2% | 2026-Q2 |
| ASSETMARK, INC added | 238,803 | $7M | 0.2% | 2026-Q2 |
| BNP PARIBAS FINANCIAL MARKETS added | 227,990 | $6M | 0.2% | 2026-Q2 |
| Caption Management, LLC added | 199,774 | $5M | 0.2% | 2026-Q2 |
| FOLKETRYGDFONDET added | 165,082 | $5M | 0.2% | 2026-Q2 |
| JANE STREET GROUP, LLC added | 164,743 | $5M | 0.2% | 2026-Q2 |
| Tidal Investments LLC trimmed | 162,384 | $4M | 0.2% | 2026-Q2 |
| AIMZ Investment Advisors, LLC | 160,910 | $4M | 0.2% | 2026-Q2 |
| LPL Financial LLC trimmed | 144,321 | $4M | 0.1% | 2026-Q2 |
| Schonfeld Strategic Advisors LLC added | 141,353 | $4M | 0.1% | 2026-Q2 |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC added | 139,125 | $4M | 0.1% | 2026-Q2 |
| Point72 Asset Management, L.P. trimmed | 135,647 | $4M | 0.1% | 2026-Q2 |
| Woodline Partners LP trimmed | 133,387 | $4M | 0.1% | 2026-Q2 |
| ROYAL BANK OF CANADA trimmed | 127,889 | $4M | 0.1% | 2026-Q2 |
| Creative Planning added | 119,169 | $3M | 0.1% | 2026-Q2 |
| AQR CAPITAL MANAGEMENT LLC added | 106,104 | $3M | 0.1% | 2026-Q2 |
| Ishara Investments LP added | 102,500 | $3M | 0.1% | 2026-Q2 |
| Legacy Wealth Asset Management, LLC added | 102,164 | $3M | 0.1% | 2026-Q2 |
| SEI INVESTMENTS CO trimmed | 91,324 | $3M | 0.1% | 2026-Q2 |
| Integrated Quantitative Investments LLC added | 90,718 | $2M | 0.1% | 2026-Q2 |
| US BANCORP \DE\ trimmed | 88,420 | $2M | 0.1% | 2026-Q2 |
| Quadrature Capital Ltd added | 78,569 | $2M | 0.1% | 2026-Q2 |
| Cetera Investment Advisers trimmed | 76,454 | $2M | 0.1% | 2026-Q2 |
| QRG CAPITAL MANAGEMENT, INC. added | 72,643 | $2M | 0.1% | 2026-Q2 |
| IMC-Chicago, LLC added | 71,596 | $2M | 0.1% | 2026-Q2 |
| Madison Asset Management, LLC trimmed | 70,781 | $2M | 0.1% | 2026-Q2 |
| RAYMOND JAMES FINANCIAL INC added | 69,579 | $2M | 0.1% | 2026-Q2 |
| GEODE CAPITAL MANAGEMENT, LLC added | 65,711 | $2M | 0.1% | 2026-Q2 |
| Terra Nova Asset Management LLC added | 64,239 | $2M | 0.1% | 2026-Q2 |
| AMERIPRISE FINANCIAL INC trimmed | 60,207 | $2M | 0.1% | 2026-Q2 |
| Bank of New York Mellon Corp added | 60,106 | $2M | 0.1% | 2026-Q2 |
| STIFEL FINANCIAL CORP trimmed | 58,237 | $2M | 0.1% | 2026-Q2 |
| LEVEL FOUR ADVISORY SERVICES, LLC added | 58,000 | $2M | 0.1% | 2026-Q2 |
| MML INVESTORS SERVICES, LLC added | 55,948 | $2M | 0.1% | 2026-Q2 |
| Vestmark Advisory Solutions, Inc. trimmed | 55,781 | $2M | 0.1% | 2026-Q2 |
| Callan Family Office, LLC trimmed | 55,033 | $2M | 0.1% | 2026-Q2 |
| Mariner, LLC trimmed | 54,677 | $2M | 0.1% | 2026-Q2 |
| BANK OF MONTREAL /CAN/ trimmed | 52,043 | $1M | 0.1% | 2026-Q2 |
| NEUBERGER BERMAN GROUP LLC trimmed | 50,557 | $1M | 0.1% | 2026-Q2 |
| Avidity Partners Management LP | 50,000 | $1M | 0.0% | 2026-Q2 |
| Vanguard Personalized Indexing Management, LLC trimmed | 49,511 | $1M | 0.0% | 2026-Q2 |
| DIMENSIONAL FUND ADVISORS LP trimmed | 49,015 | $1M | 0.0% | 2026-Q2 |
| Entropy Technologies, LP new | 48,654 | $1M | 0.0% | 2026-Q2 |
| Pinnacle Financial Partners, Inc. added | 47,573 | $1M | 0.0% | 2026-Q2 |
| FIFTH THIRD BANCORP trimmed | 47,181 | $1M | 0.0% | 2026-Q2 |
| BAROMETER CAPITAL MANAGEMENT INC. added | 45,400 | $1M | 0.0% | 2026-Q2 |
| Vident Advisory, LLC trimmed | 44,400 | $1M | 0.0% | 2026-Q2 |
| ExodusPoint Capital Management, LP new | 43,172 | $1M | 0.0% | 2026-Q2 |
| Nuveen, LLC new | 42,948 | $1M | 0.0% | 2026-Q2 |
| DAVENPORT & Co LLC trimmed | 42,544 | $1M | 0.0% | 2026-Q2 |
| LMR Partners LLP new | 42,196 | $1M | 0.0% | 2026-Q2 |
| WINTON GROUP Ltd added | 40,900 | $1M | 0.0% | 2026-Q2 |
| RHUMBLINE ADVISERS added | 39,985 | $1M | 0.0% | 2026-Q2 |
| Cerity Partners LLC added | 39,904 | $1M | 0.0% | 2026-Q2 |
| TRUIST FINANCIAL CORP trimmed | 38,356 | $1M | 0.0% | 2026-Q2 |
| GRANDFIELD & DODD, LLC added | 37,633 | $1M | 0.0% | 2026-Q2 |
| UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC trimmed | 32,612 | $896K | 0.0% | 2026-Q2 |
| GTS SECURITIES LLC trimmed | 32,116 | $882K | 0.0% | 2026-Q2 |
| CAPITAL FUND MANAGEMENT S.A. trimmed | 31,361 | $861K | 0.0% | 2026-Q2 |
| KEYBANK NATIONAL ASSOCIATION/OH added | 31,068 | $853K | 0.0% | 2026-Q2 |
Ownership over time
Tracked institutional holder count and total shares held by filing quarter (independent scales). The curated-era tail and any mid-ingest latest quarter are handled honestly — a partial quarter is not drawn as a collapse.
Reading this table
Funds hold the same stock for different reasons — an index fund “holds” almost everything, an active manager sizes a name to a mandate and a benchmark, and each fund entered at its own price and time. Because 13F is filed up to 45 days after quarter-end, every row is a backward-looking snapshot; a manager may have traded since. Share-class siblings (a company’s A and C shares) are rolled up to one line so a dual-class name is never double-counted. Compare like-for-like. A large holder is not an endorsement, and a fund exiting is not a warning — this is a starting question, not a verdict.
About 13F filings
A Form 13F is a quarterly disclosure that institutional investment managers with over $100 million in US-listed equities must file with the SEC. In plain English: it is a snapshot of the long stock positions a fund held at the end of a quarter. It covers long US-listed equities only — not short positions, options, cash, or private holdings — and the funds shown are the large sample we track, not the complete 13F universe.