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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 Mar 2026
the date the book describes
Filed
27 Oct 2026
latest of these filings; the earliest 12 May 2026
Managers listing it
23
at least, of 95 tracked, among listed positions
Comparable managers
91
filed both Q4 2025 and Q1 2026; 12 listed it in both
Shares listed
17,266,382
combined, among listed positions
Reported value
$12.6bn
combined, at the quarter end

AllianceBernstein LP. Values in this filing are at the previous quarter end's prices; its share count is the quarter end's.

Among the 91 comparable managers: 15 buyers (opened or added shares) and 14 sellers (trimmed or exited), at least, among listed positions. Their net change in shares was -414,012.

Managers listing ARGX in Q1 2026

Share of 13F value is the position’s reported value over everything the manager reported that quarter. The share change is against Q4 2025, and only where both filings list the position. A rise in value with no rise in shares is the price, not buying.

23 of 23 holders

ActionFiling
Fidelity (FMR LLC)4,991,034$3.6bn0.19%Trimmed-601,28515 May 2026 (the filing on sec.gov)
T. Rowe Price Associates Inc3,374,955$2.5bn0.28%Added+12,63115 May 2026 (the filing on sec.gov)
Janus Henderson Group Ltd2,541,732$1.8bn0.88%Added+83,56818 May 2026 (the filing on sec.gov)
Capital World Investors2,256,216$1.6bn0.22%Added+339,98213 May 2026 (the filing on sec.gov)
Artisan Partners LP1,467,982$1.1bn1.72%Trimmed-288,96013 May 2026 (the filing on sec.gov)
Wellington Management Group LLP1,021,457$746m0.14%Added+342,22115 May 2026 (the filing on sec.gov)
Invesco Ltd594,697$434munder 0.1%Added+178,28912 May 2026 (the filing on sec.gov)
AllianceBernstein LP422,304$355m0.11%Added+8,12215 May 2026 (the filing on sec.gov)
Citadel Advisors LLC219,126$160munder 0.1%Trimmed-131,72515 May 2026 (the filing on sec.gov)
Two Sigma Investments LP109,121$80m0.06%Trimmed-149,43515 May 2026 (the filing on sec.gov)
Millennium Management LLC72,365$53munder 0.1%Added+11,90715 May 2026 (the filing on sec.gov)
D. E. Shaw & Co.52,122$38munder 0.1%Added+6,58915 May 2026 (the filing on sec.gov)
Jane Street Group LLC38,438$28munder 0.1%Added+9,95312 May 2026 (the filing on sec.gov)
Hudson Bay Capital Management LP30,000$22m0.08%Added+8,17813 May 2026 (the filing on sec.gov)
Voloridge Investment Management LLC22,651$17m0.07%Added+8,53915 May 2026 (the filing on sec.gov)
Squarepoint Ops LLC18,679$14munder 0.1%Trimmed-9,52315 May 2026 (the filing on sec.gov)
Susquehanna International Group LLP14,392$11munder 0.1%Trimmed-9,56715 May 2026 (the filing on sec.gov)
Balyasny Asset Management LLC13,111$9.6munder 0.1%Trimmed-28,81215 May 2026 (the filing on sec.gov)
AQR Capital Management LLC2,530$1.8munder 0.1%Added+12915 May 2026 (the filing on sec.gov)
Neuberger Berman Group LLC1,445$1.1munder 0.1%Added+12427 Oct 2026 (the filing on sec.gov)
Bridgewater Associates LP1,214$887kunder 0.1%Newnew15 May 2026 (the filing on sec.gov)
Winton Group Ltd760$555kunder 0.1%Newnew12 May 2026 (the filing on sec.gov)
Walleye Capital LLC51$37kunder 0.1%Trimmed-59713 May 2026 (the filing on sec.gov)

Largest increases and reductions, by shares

Q4 2025 to Q1 2026, 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 (2)

Exited (6)

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 →