argenx SE (ARGX) shareholders
ARGXNasdaqBiological Products, (No Diagnostic Substances)Fiscal year ends December 31
$960.04−21.29 (-2.17%)
Close on Nov 13, 2026Market cap –P/E 49.1Yield –
Ownership
Institutional holdings as of Jun 30, 2026, from 13F filings
Held by institutions
45.7%
28M of 62M shares
Institutional holders
506
84 new, 48 sold out
Net institutional buying
2M
In Q2 2026
Insider trades, 12 months
0 buys · 0 sales
Open-market trades only
Shares held by institutions
Holders of more than 5%
Latest Schedule 13D (active) or 13G (passive) filed by each holder
| Holder | Shares | % of class | Filing | As of |
|---|---|---|---|---|
| Abigail P. Johnson Joint filing with FMR LLC (9.90%) | 6,178,792 | 9.90% | 13G (passive) amendment | Sep 30, 2026 |
| BlackRock, Inc. | 4,036,853 | 6.80% | 13G (passive) amendment | Dec 31, 2023 |
Top institutional holders
13F holdings as of Jun 30, 2026
| Holder | Shares | % of ARGX | Value | Change | % of portfolio |
|---|---|---|---|---|---|
| FMR LLC | 5,231,452 | 8.45% | $4.85B | +240,418 | 0.21% |
| Price T Rowe Associates Inc /Md/ | 2,678,047 | 4.33% | $2.48B | −696,908 | 0.25% |
| Jupiter Topco LLC | 2,474,015 | 4.00% | $2.30B | New | 0.94% |
| Capital World Investors | 2,199,770 | 3.55% | $2.04B | −56,446 | 0.24% |
| Artisan Partners Limited Partnership | 1,508,778 | 2.44% | $1.40B | +40,796 | 2.22% |
| Avoro Capital Advisors LLC | 1,000,000 | 1.62% | $927.77M | – | 8.33% |
| Wellington Management Group Llp | 930,548 | 1.50% | $863.33M | −90,909 | 0.15% |
| BlackRock, Inc. | 777,237 | 1.26% | $721.10M | −31,100 | 0.01% |
| Rtw Investments, LP | 709,446 | 1.15% | $658.20M | – | 5.62% |
| Morgan Stanley | 643,123 | 1.04% | $596.67M | +82,412 | 0.03% |
| Invesco Ltd. | 443,990 | 0.72% | $411.92M | −150,707 | 0.03% |
| Bank Of America Corp /De/ | 400,234 | 0.65% | $371.33M | +117 | 0.02% |
| Alliancebernstein L.P. | 395,661 | 0.64% | $288.93M | −26,643 | 0.10% |
| Bellevue Group AG | 301,000 | 0.49% | $279.26M | −12,000 | 5.88% |
| Sands Capital Management, LLC | 298,599 | 0.48% | $277.03M | −41,686 | 1.03% |
| Bessemer Group Inc | 267,779 | 0.43% | $248.44M | +203,528 | 0.34% |
| William Blair Investment Management, LLC | 264,617 | 0.43% | $245.49M | −1,450 | 0.74% |
| Sei Investments Co | 255,073 | 0.41% | $236.65M | −31,893 | 0.21% |
| Clearbridge Investments, LLC | 253,776 | 0.41% | $235.45M | +22,420 | 0.19% |
| Jennison Associates LLC | 226,200 | 0.37% | $209.86M | −11,268 | 0.13% |
Institutional buying and selling by quarter
Positions opened, added to, reduced and closed by 13F filers
| Quarter | Holders | Shares held | % of shares | New / added | Reduced / closed | Shares bought | Shares sold |
|---|---|---|---|---|---|---|---|
| Q2 2026 | 506 | 28M | 45.7% | 84 / 181 | 162 / 48 | 4M | 2M |
| Q1 2026 | 477 | 29M | 46.6% | 63 / 177 | 172 / 89 | 2M | 3M |
| Q4 2025 | 509 | 30M | 48.5% | 99 / 175 | 167 / 52 | 3M | 4M |
| Q3 2025 | 470 | 31M | 49.3% | 91 / 178 | 137 / 57 | 2M | 4M |
| Q2 2025 | 439 | 32M | 52.0% | 54 / 176 | 146 / 59 | 3M | 4M |
| Q1 2025 | 447 | 33M | 53.9% | 83 / 156 | 151 / 27 | 2M | 3M |
| Q4 2024 | 397 | 34M | 55.2% | 80 / 144 | 122 / 34 | 3M | 3M |
| Q3 2024 | 357 | 35M | 56.7% | 55 / 135 | 117 / 32 | 5M | 3M |
| Q2 2024 | 336 | 34M | 55.7% | 52 / 130 | 106 / 41 | 3M | 4M |
| Q1 2024 | 328 | 35M | 57.2% | 44 / 127 | 115 / 61 | 6M | 4M |
| Q4 2023 | 346 | 33M | 54.1% | 66 / 149 | 99 / 58 | 6M | 5M |
| Q3 2023 | 341 | 33M | 52.8% | 78 / 137 | 95 / 23 | 5M | 3M |
Top mutual fund and ETF holders
Latest monthly portfolio reports (Form N-PORT)
361 funds held ARGX in Q2 2026, 5% of their shares through ETFs. Each fund counts once per quarter, from its quarter-end report.
| Fund | Shares | % of ARGX | Value | % of fund | As of |
|---|---|---|---|---|---|
| EUPAC Fund | 1,024,240 | 1.66% | $950.26M | 0.67% | Jun 30, 2026 |
| New Economy Fund | 713,694 | 1.15% | $596.64M | 1.16% | May 31, 2026 |
| Fidelity Growth Company Fund | 609,066 | 0.98% | $509.17M | 0.52% | May 31, 2026 |
| Janus Henderson Forty Fund | 518,956 | 0.84% | $481.47M | 2.02% | Jun 30, 2026 |
| Fidelity OTC Portfolio | 481,926 | 0.78% | $411.48M | 0.95% | Jul 31, 2026 |
| iShares Biotechnology ETF | 368,177 | 0.59% | $341.58M | 3.76% | Jun 30, 2026 |
| Janus Henderson Enterprise Fund | 309,064 | 0.50% | $286.74M | 1.28% | Jun 30, 2026 |
| Invesco American Franchise Fund | 245,620 | 0.40% | $205.34M | 1.12% | May 31, 2026 |
| T. Rowe Price Growth Stock Fund, Inc. | 225,019 | 0.36% | $208.77M | 0.42% | Jun 30, 2026 |
| T. Rowe Price Large-Cap Growth Fund | 211,419 | 0.34% | $196.15M | 0.95% | Jun 30, 2026 |
| Fidelity Contrafund | 210,533 | 0.34% | $195.33M | 0.11% | Jun 30, 2026 |
| Fidelity Puritan Fund | 209,689 | 0.34% | $175.30M | 0.52% | May 31, 2026 |
| T. Rowe Price New Horizons Fund, Inc. | 208,186 | 0.34% | $193.15M | 1.31% | Jun 30, 2026 |
| T. Rowe Price Overseas Stock Fund | 188,952 | 0.31% | $161.33M | 0.65% | Jul 31, 2026 |
| Fidelity Advisor Growth Opportunities Fund | 181,699 | 0.29% | $151.90M | 0.43% | May 31, 2026 |
Short interest
Shares sold short and not yet bought back, as of Oct 30, 2026 (FINRA, reported twice a month)
Short % of shares outstanding
–
1M shares short
Days to cover
3.4
At 0M shares a day
Change since last report
+4.3%
From 1M shares
Short volume, 20 days
59.6%
Of volume reported to FINRA
Shares sold short, last 12 months
Short sale volume counts trades marked short on any given day, including market-maker hedging, so it runs far higher than the share of argenx's stock actually held short. Settlement fails (shares not delivered on time) peaked at 19,757 shares on Aug 19, 2026 over the last 90 days.
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