Who owns ARGX
Which tracked institutional funds hold ARGX, how they are positioned, and who is buying versus exiting — from SEC Form 13F-HR filings. See ARGX 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
216 tracked funds added or opened ARGX while 75 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
ARGX’s largest tracked holder by dollar value, FMR LLC, sizes it at 0.2% of its own reported 13F book, while the median holder sizes it at 0.1% of theirs — a 0.1pp conviction gap — its largest holder concentrates the name more heavily than the typical one.
Book-share is each fund’s reported value in ARGX 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 477 tracked filers holding ARGX, 254 increased or opened the position and 229 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 ARGX 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 29
- Jupiter Topco LLC$2.3B
- Capital Research Global Investors$82M
- CANADA PENSION PLAN INVESTMENT BOARD$56M
- WESTFIELD CAPITAL MANAGEMENT CO LP$53M
- Woodline Partners LP$51M
- ARROWSTREET CAPITAL, LIMITED PARTNERSHIP$37M
Full exits 39
- JANUS HENDERSON GROUP PLC$1.8B
- LORD, ABBETT & CO. LLC$111M
- PGGM Investments$52M
- BESSEMER GROUP INC$47M
- Amundi$45M
- Handelsbanken Fonder AB$40M
Largest adds
- FMR LLC$1.2B
- BlackRock, Inc.$470M
- Capital World Investors$393M
- Artisan Partners Limited Partnership$328M
- Avoro Capital Advisors LLC$198M
- MORGAN STANLEY$187M
Largest trims
- Fiera Capital Corp$75M
- ALLIANCEBERNSTEIN L.P.$66M
- BRAIDWELL LP$46M
- TD Asset Management Inc$36M
- D. E. Shaw & Co., Inc.$30M
- Rock Springs Capital Management LP$23M
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 |
|---|---|---|---|---|
| FMR LLC added | 5,231,452 | $4.9B | 19.5% | 2026-Q2 |
| PRICE T ROWE ASSOCIATES INC /MD/ trimmed | 2,678,047 | $2.5B | 10.0% | 2026-Q2 |
| Jupiter Topco LLC new | 2,474,015 | $2.3B | 9.2% | 2026-Q2 |
| Capital World Investors trimmed | 2,199,770 | $2.0B | 8.2% | 2026-Q2 |
| Artisan Partners Limited Partnership added | 1,508,778 | $1.4B | 5.6% | 2026-Q2 |
| Avoro Capital Advisors LLC | 1,000,000 | $928M | 3.7% | 2026-Q2 |
| WELLINGTON MANAGEMENT GROUP LLP trimmed | 930,548 | $863M | 3.5% | 2026-Q2 |
| BlackRock, Inc. added | 777,237 | $721M | 2.9% | 2026-Q2 |
| RTW INVESTMENTS, LP | 709,446 | $658M | 2.6% | 2026-Q2 |
| MORGAN STANLEY added | 643,123 | $597M | 2.4% | 2026-Q2 |
| Invesco Ltd. trimmed | 443,990 | $412M | 1.7% | 2026-Q2 |
| BANK OF AMERICA CORP /DE/ added | 400,234 | $371M | 1.5% | 2026-Q2 |
| ALLIANCEBERNSTEIN L.P. trimmed | 395,661 | $289M | 1.2% | 2026-Q2 |
| Bellevue Group AG trimmed | 301,000 | $279M | 1.1% | 2026-Q2 |
| SANDS CAPITAL MANAGEMENT, LLC trimmed | 298,599 | $277M | 1.1% | 2026-Q2 |
| WILLIAM BLAIR INVESTMENT MANAGEMENT, LLC trimmed | 264,617 | $245M | 1.0% | 2026-Q2 |
| SEI INVESTMENTS CO trimmed | 255,073 | $237M | 1.0% | 2026-Q2 |
| Clearbridge Investments, LLC added | 253,776 | $235M | 0.9% | 2026-Q2 |
| JENNISON ASSOCIATES LLC trimmed | 226,200 | $210M | 0.8% | 2026-Q2 |
| FRANKLIN RESOURCES INC trimmed | 224,930 | $209M | 0.8% | 2026-Q2 |
| CITADEL ADVISORS LLC trimmed | 212,416 | $197M | 0.8% | 2026-Q2 |
| Pictet Asset Management Holding SA added | 198,282 | $184M | 0.7% | 2026-Q2 |
| TWO SIGMA INVESTMENTS, LP added | 185,638 | $172M | 0.7% | 2026-Q2 |
| AMERIPRISE FINANCIAL INC trimmed | 181,464 | $168M | 0.7% | 2026-Q2 |
| GOLDMAN SACHS GROUP INC trimmed | 177,846 | $165M | 0.7% | 2026-Q2 |
| Legal & General Group Plc added | 177,164 | $164M | 0.7% | 2026-Q2 |
| AMERICAN CENTURY COMPANIES INC trimmed | 173,193 | $161M | 0.6% | 2026-Q2 |
| Allspring Global Investments Holdings, LLC trimmed | 170,829 | $155M | 0.6% | 2026-Q2 |
| BNP PARIBAS FINANCIAL MARKETS trimmed | 157,958 | $147M | 0.6% | 2026-Q2 |
| 1832 Asset Management L.P. added | 157,940 | $147M | 0.6% | 2026-Q2 |
| DEUTSCHE BANK AG\ trimmed | 137,335 | $127M | 0.5% | 2026-Q2 |
| BAMCO INC /NY/ trimmed | 136,654 | $127M | 0.5% | 2026-Q2 |
| BARCLAYS PLC added | 134,427 | $125M | 0.5% | 2026-Q2 |
| LAZARD ASSET MANAGEMENT LLC trimmed | 131,996 | $122M | 0.5% | 2026-Q2 |
| Checkpoint Capital L.P. trimmed | 131,283 | $122M | 0.5% | 2026-Q2 |
| EVENTIDE ASSET MANAGEMENT, LLC added | 125,668 | $117M | 0.5% | 2026-Q2 |
| AGF MANAGEMENT LTD added | 125,481 | $116M | 0.5% | 2026-Q2 |
| BNP PARIBAS ASSET MANAGEMENT Holding S.A. trimmed | 121,786 | $113M | 0.5% | 2026-Q2 |
| FIRST TRUST ADVISORS LP trimmed | 101,440 | $94M | 0.4% | 2026-Q2 |
| MILLENNIUM MANAGEMENT LLC added | 94,401 | $88M | 0.4% | 2026-Q2 |
| ORBIMED ADVISORS LLC trimmed | 92,880 | $86M | 0.3% | 2026-Q2 |
| Fiera Capital Corp trimmed | 90,423 | $84M | 0.3% | 2026-Q2 |
| Capital Research Global Investors new | 88,511 | $82M | 0.3% | 2026-Q2 |
| FEDERATED HERMES, INC. trimmed | 87,288 | $81M | 0.3% | 2026-Q2 |
| PINEBRIDGE INVESTMENTS LLC trimmed | 87,050 | $81M | 0.3% | 2026-Q2 |
| Public Sector Pension Investment Board added | 84,300 | $78M | 0.3% | 2026-Q2 |
| Aberdeen Group plc added | 83,822 | $78M | 0.3% | 2026-Q2 |
| TimesSquare Capital Management, LLC trimmed | 83,114 | $77M | 0.3% | 2026-Q2 |
| Candriam S.C.A. added | 80,120 | $74M | 0.3% | 2026-Q2 |
| BANK OF MONTREAL /CAN/ trimmed | 77,213 | $72M | 0.3% | 2026-Q2 |
| Eagle Health Investments LP added | 76,417 | $71M | 0.3% | 2026-Q2 |
| Nuveen, LLC added | 74,128 | $69M | 0.3% | 2026-Q2 |
| NORTHERN TRUST CORP added | 62,219 | $58M | 0.2% | 2026-Q2 |
| UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC added | 61,312 | $57M | 0.2% | 2026-Q2 |
| CANADA PENSION PLAN INVESTMENT BOARD new | 60,577 | $56M | 0.2% | 2026-Q2 |
| Squarepoint Ops LLC added | 58,400 | $54M | 0.2% | 2026-Q2 |
| NOMURA ASSET MANAGEMENT INTERNATIONAL INC. trimmed | 58,267 | $54M | 0.2% | 2026-Q2 |
| USS Investment Management Ltd added | 57,903 | $54M | 0.2% | 2026-Q2 |
| WESTFIELD CAPITAL MANAGEMENT CO LP added | 57,082 | $53M | 0.2% | 2026-Q2 |
| ENVESTNET ASSET MANAGEMENT INC trimmed | 55,346 | $51M | 0.2% | 2026-Q2 |
| Woodline Partners LP added | 55,025 | $51M | 0.2% | 2026-Q2 |
| Rock Springs Capital Management LP trimmed | 52,750 | $49M | 0.2% | 2026-Q2 |
| Ensign Peak Advisors, Inc trimmed | 52,027 | $48M | 0.2% | 2026-Q2 |
| ADAGE CAPITAL PARTNERS GP, L.L.C. trimmed | 50,607 | $47M | 0.2% | 2026-Q2 |
| NOMURA ASSET MANAGEMENT CO LTD trimmed | 49,179 | $46M | 0.2% | 2026-Q2 |
| Jefferies Financial Group Inc. added | 45,068 | $42M | 0.2% | 2026-Q2 |
| DIMENSIONAL FUND ADVISORS LP added | 44,408 | $41M | 0.2% | 2026-Q2 |
| Tri Locum Partners LP added | 41,596 | $39M | 0.2% | 2026-Q2 |
| ARROWSTREET CAPITAL, LIMITED PARTNERSHIP added | 40,062 | $37M | 0.1% | 2026-Q2 |
| Point72 Asset Management, L.P. added | 39,983 | $37M | 0.1% | 2026-Q2 |
| UBS Group AG added | 36,583 | $34M | 0.1% | 2026-Q2 |
| RAYMOND JAMES FINANCIAL INC trimmed | 34,757 | $32M | 0.1% | 2026-Q2 |
| WELLS FARGO & COMPANY/MN trimmed | 34,453 | $32M | 0.1% | 2026-Q2 |
| VICTORY CAPITAL MANAGEMENT INC trimmed | 30,865 | $29M | 0.1% | 2026-Q2 |
| Mediolanum International Funds Ltd added | 29,785 | $27M | 0.1% | 2026-Q2 |
| Artia Global Partners LP | 29,739 | $28M | 0.1% | 2026-Q2 |
| PEREGRINE CAPITAL MANAGEMENT LLC added | 29,732 | $28M | 0.1% | 2026-Q2 |
| ROYAL BANK OF CANADA trimmed | 28,562 | $26M | 0.1% | 2026-Q2 |
| Perpetual Ltd trimmed | 28,246 | $26M | 0.1% | 2026-Q2 |
| BLAIR WILLIAM & CO/IL added | 27,666 | $26M | 0.1% | 2026-Q2 |
| ODDO BHF ASSET MANAGEMENT SAS | 25,009 | $23M | 0.1% | 2026-Q2 |
| TD Asset Management Inc trimmed | 24,675 | $23M | 0.1% | 2026-Q2 |
| GEODE CAPITAL MANAGEMENT, LLC added | 23,861 | $22M | 0.1% | 2026-Q2 |
| Patient Square Capital LP trimmed | 23,000 | $21M | 0.1% | 2026-Q2 |
| Life Cycle Investment Partners Ltd trimmed | 22,490 | $21M | 0.1% | 2026-Q2 |
| VAN ECK ASSOCIATES CORP trimmed | 22,193 | $21M | 0.1% | 2026-Q2 |
| NEW YORK STATE COMMON RETIREMENT FUND trimmed | 22,082 | $20M | 0.1% | 2026-Q2 |
| Soleus Capital Management, L.P. added | 19,955 | $19M | 0.1% | 2026-Q2 |
| LPL Financial LLC trimmed | 19,499 | $18M | 0.1% | 2026-Q2 |
| Jain Global LLC added | 18,913 | $18M | 0.1% | 2026-Q2 |
| VOLORIDGE INVESTMENT MANAGEMENT, LLC trimmed | 18,797 | $17M | 0.1% | 2026-Q2 |
| BRAIDWELL LP trimmed | 17,707 | $16M | 0.1% | 2026-Q2 |
| Bank of New York Mellon Corp trimmed | 16,971 | $16M | 0.1% | 2026-Q2 |
| Assenagon Asset Management S.A. added | 16,531 | $15M | 0.1% | 2026-Q2 |
| MANUFACTURERS LIFE INSURANCE COMPANY, THE trimmed | 16,407 | $15M | 0.1% | 2026-Q2 |
| FIL Ltd added | 16,249 | $15M | 0.1% | 2026-Q2 |
| MIROVA trimmed | 15,891 | $15M | 0.1% | 2026-Q2 |
| JPMORGAN CHASE & CO added | 15,627 | $14M | 0.1% | 2026-Q2 |
| Quantinno Capital Management LP added | 15,550 | $14M | 0.1% | 2026-Q2 |
| HSBC HOLDINGS PLC trimmed | 15,429 | $14M | 0.1% | 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.