Which funds own ARGX
Argenx Se in the Q2 2026 filings. At least 9 of the 91 current managers on file reported a position, worth $14.4bn between them. It is among the largest positions of fewer than a fifth of the current managers on file. Buying and selling roughly cancelled this quarter, which is what a name looks like when the argument is still live.
- Managers holding
- 9
- at least, of 91 current
- Combined value
- $14.4bn
- as reported
- Opened
- 1
- new this quarter
- Added to
- 3
- already held
- Trimmed or sold out
- 5
- 0 sold out entirely
Only each manager’s largest 200 positions are listed here, so a smaller holder may be missing.
Managers reporting a position
Largest first. Weight is the share of that manager’s whole reported book, which is the number worth quoting: $400m is a rounding error in one book and a defining bet in another.
| Manager | Value | Weight | Shares | Change on the quarter | Action |
|---|---|---|---|---|---|
| Fidelity (FMR LLC) Long-only · $2304bn book | $4.9bn | 0.2% | 5,231,452 | +$1.2bn+240,418 | Added |
| T. Rowe Price Associates Inc Long-only · $999bn book | $2.5bn | 0.2% | 2,678,047 | +$20m-696,908 | Trimmed |
| Janus Henderson Group Ltd Long-only · $245bn book | $2.3bn | 0.9% | 2,474,015 | +$448m-67,717 | Trimmed |
| Capital World Investors Long-only · $846bn book | $2.0bn | 0.2% | 2,199,770 | +$393m-56,446 | Trimmed |
| Artisan Partners LP Long-only · $63.1bn book | $1.4bn | 2.2% | 1,508,778 | +$328m+40,796 | Added |
| Wellington Management Group LLP Long-only · $580bn book | $863m | 0.1% | 930,548 | +$117m-90,909 | Trimmed |
| AllianceBernstein LP Long-only · $302bn book | $289m | 0.1% | 395,661 | -$66m-26,643 | Trimmed |
| Two Sigma Investments LP Quantitative · $138bn book | $172m | 0.1% | 185,638 | +$93m+76,517 | Added |
| Woodline Partners LP Long/short equity · $32.4bn book | $51m | 0.2% | 55,025 | opened55,025 | New |
Ownership through time
At least 14 of the 95 managers whose filings are on file listed ARGX in Q2 2026, against 1 in Q4 2017. 3 managers more than in Q1 2026: 3 started positions; 1 listed it again; 1 no longer listed it among the positions read, which can mean a holding below the listed range or a filing not yet made.
Each manager’s largest 500 positions a quarter are read, so a small holding in a very large book can be missing, and a manager is counted as leaving only where its own filing shows it.
- Q4 2017: 1
- Q1 2018: 2
- Q2 2018: 1
- Q3 2018: 2
- Q4 2018: 4
- Q1 2019: 5
- Q2 2019: 6
- Q3 2019: 6
- Q4 2019: 6
- Q1 2020: 6
- Q2 2020: 9
- Q3 2020: 8
- Q4 2020: 7
- Q1 2021: 8
- Q2 2021: 9
- Q3 2021: 8
- Q4 2021: 9
- Q1 2022: 8
- Q2 2022: 13
- Q3 2022: 14
- Q4 2022: 13
- Q1 2023: 13
- Q2 2023: 18
- Q3 2023: 21
- Q4 2023: 17
- Q1 2024: 13
- Q2 2024: 14
- Q3 2024: 13
- Q4 2024: 14
- Q1 2025: 17
- Q2 2025: 18
- Q3 2025: 16
- Q4 2025: 16
- Q1 2026: 11
- Q2 2026: 14
- Q4 2017: $1.3m
- Q1 2018: $72m
- Q2 2018: $704k
- Q3 2018: $19m
- Q4 2018: $569m
- Q1 2019: $1.0bn
- Q2 2019: $1.3bn
- Q3 2019: $1.1bn
- Q4 2019: $1.7bn
- Q1 2020: $1.4bn
- Q2 2020: $3.0bn
- Q3 2020: $3.6bn
- Q4 2020: $4.1bn
- Q1 2021: $4.1bn
- Q2 2021: $4.6bn
- Q3 2021: $4.5bn
- Q4 2021: $5.3bn
- Q1 2022: $5.3bn
- Q2 2022: $6.5bn
- Q3 2022: $5.3bn
- Q4 2022: $5.5bn
- Q1 2023: $5.9bn
- Q2 2023: $6.6bn
- Q3 2023: $8.7bn
- Q4 2023: $6.3bn
- Q1 2024: $6.8bn
- Q2 2024: $7.9bn
- Q3 2024: $10.7bn
- Q4 2024: $12.3bn
- Q1 2025: $11.8bn
- Q2 2025: $10.8bn
- Q3 2025: $13.8bn
- Q4 2025: $14.8bn
- Q1 2026: $12.3bn
- Q2 2026: $15.0bn
Between the quarter ends of Q1 2026 and Q2 2026. Each change in shares is valued at the Q2 2026 price, so the price’s own move is left out; a 13F shows the two quarter ends, not when in between anything was bought or sold.
Started in Q2 2026
Largest increases, by shares
- Fidelity (FMR LLC)4,991,034 to 5,231,452 shares+$223m
- Capital Research Global Investorsnew: 88,511 shares+$82m
- Two Sigma Investments LP109,121 to 185,638 shares+$71m
- Woodline Partners LPnew: 55,025 shares+$51m
- Artisan Partners LP1,467,982 to 1,508,778 shares+$38m
Largest decreases, by shares
- T. Rowe Price Associates Inc3,374,955 to 2,678,047 shares-$647m
- Invesco Ltd594,697 to 443,990 shares-$140m
- Wellington Management Group LLP1,021,457 to 930,548 shares-$84m
- Janus Henderson Group Ltd2,541,732 to 2,474,015 shares-$63m
- Capital World Investors2,256,216 to 2,199,770 shares-$52m
Left it
No manager on file is shown leaving it.
| Manager | Value over time | First listed | Largest | Q2 2026 |
|---|---|---|---|---|
| Fidelity (FMR LLC) | Q4 2018 | $4.9bn | $4.9bn | |
| T. Rowe Price Associates Inc | Q4 2018 | $3.4bn | $2.5bn | |
| Janus Henderson Group Ltd | Q2 2020 | $2.3bn | $2.3bn | |
| Capital World Investors | Q1 2019 | $2.0bn | $2.0bn | |
| Artisan Partners LP | Q3 2018 | $1.9bn | $1.4bn | |
| Wellington Management Group LLP | Q1 2020 | $863m | $863m | |
| Invesco Ltd | Q3 2023 | $434m | $412m | |
| AllianceBernstein LP | Q4 2025 | $355m | $289m | |
| Two Sigma Investments LP | Q1 2025 | $217m | $172m | |
| Capital Research Global Investors | Q2 2026 | $82m | $82m | |
| Squarepoint Ops LLC | Q2 2026 | $54m | $54m | |
| Woodline Partners LP | Q1 2021 | $125m | $51m | |
| Voloridge Investment Management LLC | Q1 2019 | $45m | $17m | |
| Baillie Gifford & Co | Q2 2026 | $15k | $15k | |
| Citadel Advisors LLC | Q2 2023 | $526m | last listed Q4 2025 | |
| MFS Investment Management | Q2 2023 | $286m | last listed Q1 2024 | |
| Millennium Management LLC | Q1 2018 | $256m | last listed Q3 2025 | |
| Point72 Asset Management LP | Q2 2019 | $250m | last listed Q4 2024 | |
| Holocene Advisors LP | Q4 2021 | $201m | last listed Q2 2025 | |
| D. E. Shaw & Co. | Q2 2022 | $177m | last listed Q3 2025 | |
| Lone Pine Capital LLC | Q4 2020 | $158m | last listed Q1 2021 | |
| Marshall Wace LLP | Q3 2022 | $152m | last listed Q2 2025 | |
| Two Sigma Advisers LP | Q1 2025 | $114m | last listed Q4 2025 | |
| Acadian Asset Management LLC | Q3 2025 | $99m | last listed Q4 2025 |
What ARGX is worth
Knowing who owns it is half the question. The other half is what it is worth against the companies it trades beside, which is the one an interviewer will follow up with.
Build the comp set around ARGX →How much of the picture this is
A Form 13F reports US-listed long equity and nothing else: no shorts, no bonds, no cash and no non-US listings. It arrives forty-five days after the quarter ends, so a manager who sold in July still shows the position in a filing published in August. This page reads the managers on file here rather than every filer in the market, and each manager’s largest positions rather than the whole table, so a small position in a very large book may not appear. Say “their last filing showed” rather than “they own”, and the distinction will do you credit.
What to do with a name the funds are buying
Knowing who owns something is the start of a pitch, not the pitch. The next questions are what it is worth and why they were buying.
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The holdings, every quarter, and the week between
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