Ranked by reported Q2 2026 13F market value
Share of total reported institutional value in ARGX held by the largest 10 / 25 filers.
| # | Institution | Shares Held | Market Value | QoQ Change | Ownership % | % of Fund |
|---|---|---|---|---|---|---|
| 1 | FMR LLC | 5.2M | $4.85B | +4.8% | 8.122% | 0.21% |
| 2 | Jupiter Topco LLC | 2.5M | $2.30B | — | 3.841% | 0.94% |
| 3 | Capital World Investors | 2.2M | $2.04B | -2.5% | 3.415% | 0.24% |
| 4 | Artisan Partners Limited Partnership | 1.5M | $1.40B | +2.8% | 2.343% | 2.22% |
| 5 | Avoro Capital Advisors LLC | 1.0M | $927.8M | 0.0% | 1.553% | 8.33% |
| 6 | WELLINGTON MANAGEMENT GROUP LLP | 931K | $863.3M | -8.9% | 1.445% | 0.15% |
| 7 | BlackRock, Inc. | 777K | $721.1M | -3.9% | 1.207% | 0.01% |
| 8 | RTW INVESTMENTS, LP | 709K | $658.2M | 0.0% | 1.102% | 5.62% |
| 9 | MORGAN STANLEY | 643K | $596.7M | +14.7% | 0.999% | 0.03% |
| 10 | Invesco Ltd. | 444K | $411.9M | -25.3% | 0.689% | 0.03% |
| 11 | BANK OF AMERICA CORP /DE/ | 400K | $371.3M | +0.0% | 0.621% | 0.02% |
| 12 | ALLIANCEBERNSTEIN L.P. | 396K | $288.9M | -6.3% | 0.614% | 0.10% |
| 13 | Bellevue Group AG | 301K | $279.3M | -3.8% | 0.467% | 5.88% |
| 14 | SANDS CAPITAL MANAGEMENT, LLC | 299K | $277.0M | -12.3% | 0.464% | 1.03% |
| 15 | CITADEL ADVISORS LLC | 273K | $253.6M | -5.8% | 0.424% | 0.01% |
| 16 | WILLIAM BLAIR INVESTMENT MANAGEMENT, LLC | 265K | $245.5M | -0.5% | 0.411% | 0.74% |
| 17 | SEI INVESTMENTS CO | 255K | $236.7M | -11.1% | 0.396% | 0.21% |
| 18 | Clearbridge Investments, LLC | 254K | $235.4M | +9.7% | 0.394% | 0.19% |
| 19 | JENNISON ASSOCIATES LLC | 226K | $209.9M | -4.8% | 0.351% | 0.13% |
| 20 | FRANKLIN RESOURCES INC | 225K | $208.7M | -3.7% | 0.349% | 0.05% |
| 21 | Pictet Asset Management Holding SA | 198K | $183.8M | +33.7% | 0.308% | 0.18% |
| 22 | TWO SIGMA INVESTMENTS, LP | 186K | $172.8M | +70.7% | 0.289% | 0.13% |
| 23 | AMERIPRISE FINANCIAL INC | 181K | $168.4M | -16.0% | 0.282% | 0.03% |
| 24 | GOLDMAN SACHS GROUP INC | 178K | $165.0M | -23.3% | 0.276% | 0.01% |
| 25 | Legal & General Group Plc | 177K | $164.4M | +17.4% | 0.275% | 0.03% |
denotes a marquee investor (Buffett, Burry, ARK, Tiger Global, Pershing Square, Baupost and other widely-followed managers). “% of Fund” shows how much of that investor’s total 13F portfolio is invested in ARGX — a direct measure of their conviction.
Filings activity in ARGX during Q2 2026, grouped by how each filer changed its position.
Institutions that opened a new ARGX position in Q2 2026
Institutions that fully closed their ARGX position in Q2 2026
8 quarters of 13F filings · Δ columns show change vs prior quarter
| Quarter | Inst. Holders | Δ Holders | Ownership % | Δ Ownership | Total 13F Value | Δ Value |
|---|---|---|---|---|---|---|
| Q2 2026 | 507 | +6.5% | 44.40% | 1.04 pp | $23.39B | +26% |
| Q1 2026 | 476 | 5.4% | 45.44% | 3.18 pp | $18.60B | 16% |
| Q4 2025 | 503 | +9.3% | 48.62% | 0.15 pp | $22.22B | +11% |
| Q3 2025 | 460 | +7.0% | 48.77% | 1.40 pp | $20.06B | +36% |
| Q2 2025 | 430 | 1.1% | 50.17% | 1.58 pp | $14.71B | 8.0% |
| Q1 2025 | 435 | +13% | 51.75% | 0.65 pp | $16.00B | 4.2% |
| Q4 2024 | 384 | +12% | 52.40% | 1.60 pp | $16.70B | +11% |
| Q3 2024 | 344 | — | 54.00% | — | $14.98B | — |
Source: SEC 13F institutional filings. Ownership % requires market cap data and will show once linked. Δ columns compare to the immediately prior filed quarter.
Quick answers to the most common questions about buying ARGX stock.
Based on Q2 2026 13F filings, institutional ownership of argenx SE stands at 44.4%, held across 507 reporting institutions.
FMR LLC is the largest reported institutional holder of ARGX, with approximately 5,231,452 shares worth $4.85B as of Q2 2026.
Yes — 2 widely-followed marquee investors appear among the top 25 institutional holders of ARGX, including CITADEL ADVISORS LLC, TWO SIGMA INVESTMENTS, LP.
Our composite Smart Money Score for ARGX is 52 out of 100 (Neutral). It combines net institutional buying activity, ownership shift, marquee investor presence, and holder-count growth.
77 institutions opened new positions in ARGX during Q2 2026, while 48 fully exited. 351 added to existing positions and 67 trimmed.
ARGX institutional ownership fell by 1.04 percentage points quarter-over-quarter, with a net change of +31 holders.
The top 10 institutions account for 63.1% of all reported 13F value in ARGX, and the top 25 account for 77.9%.
All data is sourced from SEC Form 13F filings, which institutional investment managers with at least $100M in assets are required to file each quarter. We process every 13F filing from EDGAR and recompute the aggregates after each cycle. Insider transactions are sourced from Form 4 filings.
argenx SE (ARGX) Institutional Ownership