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ARGX in the 13F filings

Argenx Se · CUSIP 04016X101

Sector · Pharmaceuticals and biotechnologyTheme · Biological productsTheme · Healthcare: biopharma and medtech· L3VLUP-defined
Quarter
Q3 2026 · early filersQ2 2026Q1 2026Q4 2025Q3 2025Q2 2025Q1 2025Q4 2024Q3 2024Q2 2024Q1 2024Q4 2023
Quarter end
31 Dec 2025
the date the book describes
Filed
27 Oct 2026
latest of these filings; the earliest 10 Feb 2026
Managers listing it
28
at least, of 95 tracked, among listed positions
Comparable managers
92
filed both Q3 2025 and Q4 2025; 16 listed it in both
Shares listed
17,815,894
combined, among listed positions
Reported value
$15.0bn
combined, at the quarter end

Among the 92 comparable managers: 14 buyers (opened or added shares) and 16 sellers (trimmed or exited), at least, among listed positions. Their net change in shares was -1,205,409.

Managers listing ARGX in Q4 2025

Share of 13F value is the position’s reported value over everything the manager reported that quarter. The share change is against Q3 2025, and only where both filings list the position. A rise in value with no rise in shares is the price, not buying.

28 of 28 holders

ActionFiling
Fidelity (FMR LLC)5,592,319$4.7bn0.24%Trimmed-100,02717 Feb 2026 (the filing on sec.gov)
T. Rowe Price Associates Inc3,362,324$2.8bn0.30%Trimmed-278,08517 Feb 2026 (the filing on sec.gov)
Janus Henderson Group Ltd2,458,164$2.1bn0.92%Trimmed-117,08717 Feb 2026 (the filing on sec.gov)
Capital World Investors1,916,234$1.6bn0.22%Trimmed-43,27011 Feb 2026 (the filing on sec.gov)
Artisan Partners LP1,756,942$1.5bn2.21%Trimmed-429,56817 Feb 2026 (the filing on sec.gov)
Wellington Management Group LLP679,236$571m0.10%Trimmed-50,75017 Feb 2026 (the filing on sec.gov)
Invesco Ltd416,408$350munder 0.1%Added+331,48919 Feb 2026 (the filing on sec.gov)
AllianceBernstein LP414,182$348m0.11%Added+329,42917 Feb 2026 (the filing on sec.gov)
Citadel Advisors LLC350,851$295munder 0.1%Trimmed-362,70817 Feb 2026 (the filing on sec.gov)
Two Sigma Investments LP258,556$217m0.31%Trimmed-35,60417 Feb 2026 (the filing on sec.gov)
Two Sigma Advisers LP135,500$114m0.22%Trimmed-4,20017 Feb 2026 (the filing on sec.gov)
Acadian Asset Management LLC117,887$99m0.16%Added+55,08310 Feb 2026 (the filing on sec.gov)
Millennium Management LLC60,458$51munder 0.1%Trimmed-287,06017 Feb 2026 (the filing on sec.gov)
D. E. Shaw & Co.45,533$38munder 0.1%Trimmed-123,49517 Feb 2026 (the filing on sec.gov)
Woodline Partners LP45,426$38m0.15%Trimmed-124,05017 Feb 2026 (the filing on sec.gov)
Balyasny Asset Management LLC41,923$35munder 0.1%Newnew17 Feb 2026 (the filing on sec.gov)
Jane Street Group LLC28,485$24munder 0.1%Trimmed-21,41912 Feb 2026 (the filing on sec.gov)
Squarepoint Ops LLC28,202$24munder 0.1%Added+9,21713 Feb 2026 (the filing on sec.gov)
Moore Capital Management LP25,000$21m0.30%Added+10,00017 Feb 2026 (the filing on sec.gov)
Susquehanna International Group LLP23,959$20munder 0.1%Newnew17 Feb 2026 (the filing on sec.gov)
Hudson Bay Capital Management LP21,822$18m0.06%Added+11,32213 Feb 2026 (the filing on sec.gov)
Voloridge Investment Management LLC14,112$12munder 0.1%Trimmed-44,37917 Feb 2026 (the filing on sec.gov)
Marshall Wace LLP13,508$11munder 0.1%Added+98313 Feb 2026 (the filing on sec.gov)
AQR Capital Management LLC2,401$2.0munder 0.1%Added+46917 Feb 2026 (the filing on sec.gov)
Verition Fund Management LLC2,345$2.0munder 0.1%Added+1,97113 Feb 2026 (the filing on sec.gov)
Page 1 of 2

Largest increases and reductions, by shares

Q3 2025 to Q4 2025, among managers that listed it in both quarters or opened it.

Increases

Reductions

New positions and exits

At least these many: a manager is shown exiting only where its own filing shows the position gone.

New (3)

Exited (2)

Ownership over time

Every quarter on file. A quarter-end value moves with the price as well as with the shares held; buyers and sellers count comparable managers, by shares.
13 in Q3 2024 to 14 in Q2 2026

Tracked managers listing it, at least.

0102030201820192020202120222023202420252026
the quarter shown share split complete books; unmarked quarters rest on listed positionsClick a quarter to open it.
ARGX by quarter
QuarterHoldersReported valueBuyersSellers
Q4 20171$1.3mn.a.n.a.
Q1 20182$72mn.a.n.a.
Q2 20181$704kn.a.n.a.
Q3 20182$19mn.a.n.a.
Q4 20184$569mn.a.n.a.
Q1 20195$1.0bnn.a.n.a.
Q2 20196$1.3bnn.a.n.a.
Q3 20196$1.1bnn.a.n.a.
Q4 20196$1.7bnn.a.n.a.
Q1 20206$1.4bnn.a.n.a.
Q2 20209$3.0bnn.a.n.a.
Q3 20208$3.6bnn.a.n.a.
Q4 20207$4.1bnn.a.n.a.
Q1 20218$4.1bnn.a.n.a.
Q2 20219$4.6bnn.a.n.a.
Q3 20218$4.5bnn.a.n.a.
Q4 20219$5.3bnn.a.n.a.
Q1 20228$5.3bnn.a.n.a.
Q2 202213$6.5bnn.a.n.a.
Q3 202214$5.3bnn.a.n.a.
Q4 202213$5.5bnn.a.n.a.
Q1 202313$5.9bnn.a.n.a.
Q2 202318$6.6bnn.a.n.a.
Q3 202321$8.7bnn.a.n.a.
Q4 202317$6.3bn126
Q1 202413$6.8bn68
Q2 202414$7.9bn97
Q3 202413$10.7bn77
Q4 202414$12.3bn86
Q1 202517$11.8bn99
Q2 202518$10.8bn89
Q3 202516$13.8bn107
Q4 202516$14.8bn1416
Q1 202611$12.3bn1514
Q2 202614$15.0bn1615

Compare with…

Holders over time, buyers and sellers, and the managers holding both, side by side for up to four stocks.

ARGX and GILD →ARGX and AMGN →ARGX and RVMD →Choose a stock to compare with ARGX →

How much of the picture this is

A 13F is a manager’s long US-listed equity book at a quarter end, filed up to 45 days later. It shows no shorts, cash, bonds or performance, and it is never today’s portfolio. Large books are listed to their largest positions, so a manager missing from this table may still hold a small position below that line. These are 95 tracked managers, not the institutional market.

Which funds own ARGX, latest filings →Back to the 13F Explorer →