argenx SE (ARGX) Ownership
ARGX ownership summary
as of October 17, 2026- Institutions
- 46.1% of shares outstanding
- Insiders
- 0.00% of shares outstanding
- Shares outstanding
- 62.9M
- Float
- 1.56B shares available to trade
- Short interest
- 2.16% 1.4M shares short
- Days to cover
- 5.51 short interest up 3.0% vs prior month
- Institutions 46.13%
- Other investors 53.87%
ARGX top institutional holders
20 largest| # | Holder | % of shares | Shares | Value | Change | Reported |
|---|---|---|---|---|---|---|
| 1 | FMR Inc | 8.36% | 5.2M | $4.29B | +240,418 (+4.8%) | June 30, 2026 |
| 2 | T. Rowe Price Associates, Inc. | 4.28% | 2.7M | $2.19B | −696,908 (−20.6%) | June 30, 2026 |
| 3 | HHG PLC | 4.06% | 2.5M | $2.08B | +83,568 (+3.4%) | March 31, 2026 |
| 4 | Jupiter Topco LLC | 3.95% | 2.5M | $2.03B | +2.5M (0.0%) | June 30, 2026 |
| 5 | Capital World Investors | 3.52% | 2.2M | $1.80B | −56,446 (−2.5%) | June 30, 2026 |
| 6 | Artisan Partners Limited Partnership | 2.41% | 1.5M | $1.24B | +40,796 (+2.8%) | June 30, 2026 |
| 7 | venBio Select Advisor LLC | 1.60% | 1.0M | $819.1M | — | June 30, 2026 |
| 8 | Wellington Management Company LLP | 1.49% | 931K | $762.2M | −90,909 (−8.9%) | June 30, 2026 |
| 9 | BlackRock Inc | 1.24% | 777K | $636.7M | −31,100 (−3.8%) | June 30, 2026 |
| 10 | RTW INVESTMENTS, LLC | 1.13% | 709K | $581.1M | — | June 30, 2026 |
| 11 | Morgan Stanley - Brokerage Accounts | 1.03% | 643K | $526.8M | +82,412 (+14.7%) | June 30, 2026 |
| 12 | Amvescap Plc. | 0.71% | 444K | $363.7M | −150,707 (−25.3%) | June 30, 2026 |
| 13 | Bank of America Corp | 0.64% | 400K | $327.8M | +117 (+0.0%) | June 30, 2026 |
| 14 | AllianceBernstein L.P. | 0.63% | 396K | $324.1M | −26,643 (−6.3%) | June 30, 2026 |
| 15 | Bellevue Group AG | 0.48% | 301K | $246.6M | −12,000 (−3.8%) | June 30, 2026 |
| 16 | Sands Capital Management, LLC | 0.48% | 299K | $244.6M | −41,686 (−12.3%) | June 30, 2026 |
| 17 | Bessemer Group Inc | 0.43% | 268K | $219.3M | +203,528 (+316.8%) | June 30, 2026 |
| 18 | William Blair Investment Management, LLC | 0.42% | 265K | $216.8M | −1,450 (−0.5%) | June 30, 2026 |
| 19 | SEI Investments Co | 0.41% | 255K | $208.9M | −31,893 (−11.1%) | June 30, 2026 |
| 20 | ClearBridge Advisors, LLC | 0.41% | 254K | $207.9M | +22,420 (+9.7%) | June 30, 2026 |
Value at the latest close. Change = shares bought or sold in the latest quarterly filing (13F). In the top 20, 8 holders added 3.1M shares and 10 cut 1.1M.
ARGX top mutual fund and ETF holders
20 largest| # | Holder | % of shares | Shares | Value | Change | Reported |
|---|---|---|---|---|---|---|
| 1 | American Funds EUPAC A | 1.64% | 1.0M | $839.0M | −72,961 (−6.6%) | June 30, 2026 |
| 2 | American Funds New Economy A | 1.17% | 730K | $597.8M | +16,126 (+2.3%) | June 30, 2026 |
| 3 | Fidelity Growth Company Fund | 0.97% | 608K | $498.3M | — | August 31, 2026 |
| 4 | Janus Henderson Forty S | 0.80% | 498K | $408.2M | — | August 31, 2026 |
| 5 | Fidelity OTC | 0.75% | 472K | $386.8M | −9,700 (−2.0%) | August 31, 2026 |
| 6 | iShares Biotechnology ETF | 0.69% | 434K | $355.2M | −3,288 (−0.8%) | September 30, 2026 |
| 7 | Janus Henderson Enterprise D | 0.49% | 309K | $253.2M | — | August 31, 2026 |
| 8 | Fidelity Contrafund | 0.38% | 241K | $197.0M | +11,017 (+4.8%) | August 31, 2026 |
| 9 | T. Rowe Price Growth Stock | 0.34% | 210K | $172.0M | −934 (−0.4%) | August 31, 2026 |
| 10 | Fidelity Puritan | 0.34% | 210K | $171.8M | +13,500 (+6.9%) | July 31, 2026 |
| 11 | T. Rowe Price Lrg Cp Gr I | 0.29% | 180K | $147.6M | −4,017 (−2.2%) | August 31, 2026 |
| 12 | T. Rowe Price New Horizons | 0.28% | 177K | $144.7M | −6,089 (−3.3%) | August 31, 2026 |
| 13 | Fidelity Growth Company K6 | 0.27% | 172K | $140.9M | — | August 31, 2026 |
| 14 | Artisan Mid Cap Investor | 0.27% | 170K | $138.9M | −16,437 (−8.8%) | June 30, 2026 |
| 15 | Fidelity Advisor Growth Opps M | 0.26% | 162K | $132.4M | — | August 31, 2026 |
| 16 | T. Rowe Price Overseas Stock | 0.25% | 157K | $128.9M | −31,555 (−16.7%) | August 31, 2026 |
| 17 | Janus Global Life Science AUSD | 0.25% | 156K | $127.4M | −455 (−0.3%) | June 30, 2026 |
| 18 | Fidelity Select Health Care | 0.24% | 150K | $122.9M | −6,000 (−3.8%) | August 31, 2026 |
| 19 | Janus Henderson Global Life Sciences D | 0.24% | 149K | $121.9M | −15,777 (−9.6%) | August 31, 2026 |
| 20 | Janus Henderson Contrarian D | 0.23% | 144K | $118.2M | — | August 31, 2026 |
Funds report holdings monthly or quarterly; dates differ by fund.
ARGX shares outstanding
Year-end shares outstanding, adjusted for splits.
Who owns ARGX
Institutional investors own 46.1% of argenx's shares and insiders 0.00%. The largest holder is FMR Inc with 8.36% of the shares (5.2M), as of June 30, 2026. Among the top 20 institutions, 8 added shares and 10 reduced their stake in the latest filings. Short interest is 2.16% of the float, or 5.51 days of average trading volume. The share count rose 321.5% since 2014.
Related: ARGX analyst forecast, ARGX key metrics. See the ARGX stock overview for the latest quote and news.
ARGX ownership FAQ
Who owns the most argenx stock?
The largest shareholders of argenx are FMR Inc (8.36%), T. Rowe Price Associates, Inc. (4.28%), HHG PLC (4.06%), Jupiter Topco LLC (3.95%), Capital World Investors (3.52%).
What percentage of argenx is owned by institutions?
Institutions hold 46.1% of argenx's shares outstanding; insiders hold 0.00%.
Which funds own argenx?
The largest fund holders of argenx are American Funds EUPAC A (1.64%), American Funds New Economy A (1.17%), Fidelity Growth Company Fund (0.97%), Janus Henderson Forty S (0.80%), Fidelity OTC (0.75%).
What is argenx's short interest?
1.4M shares of argenx were sold short, 2.16% of the float; at the average daily volume it would take 5.51 days to cover.
How many shares of argenx are outstanding?
argenx has 62.9M shares outstanding, of which 1.56B are in the public float.