Ticker · CUSIP 04016X101

ARGX

ADR

ARGENX SE

Healthcare·Biotechnology

···Share

Holders (tracked)

Combined shares

5,411,396

Combined value

$4.55B

Last close

$849.04

Quarter

2025Q4

Price is +1.0% vs the avg quarter-end implied price across tracked holders.

Price · 1Y$849.04+252.84 (+42.41%)H $929.61 · L $532.27 · Avg Vol 374K

Tracked holders · last 8 quarters

+3 vs previous quarter over the last 8.

SEC event timeline

19 events

Ken Griffin (Citadel Advisors) trimmed2026-02-17
−362,708 shares · 2025Q4
Position
D.E. Shaw & Co. trimmed2026-02-17
−123,495 shares · 2025Q4
Position
Two Sigma Investments trimmed2026-02-17
−35,604 shares · 2025Q4
Position
Izzy Englander (Millennium Mgmt) trimmed2026-02-17
−287,060 shares · 2025Q4
Position
Steve Cohen (Point72) opened position2026-02-17
+9,500 shares · 2025Q4
Position
T. Rowe Price trimmed2026-02-17
−278,085 shares · 2025Q4
Position
Paul Tudor Jones (Tudor Investment) opened position2026-02-17
+2,148 shares · 2025Q4
Position
Wellington Management trimmed2026-02-17
−50,750 shares · 2025Q4
Position
Ron Baron (Baron Capital / BAMCO) trimmed2026-02-17
−13,975 shares · 2025Q4
Position
AQR Capital Management added2026-02-17
+469 shares · 2025Q4
Position
Sands Capital Management added2026-02-13
+340,245 shares · 2025Q4
Position
AQR Capital Management added2025-11-14
+920 shares · 2025Q3
Position
Izzy Englander (Millennium Mgmt) trimmed2025-11-14
−82,326 shares · 2025Q3
Position
Two Sigma Investments added2025-11-14
+250,278 shares · 2025Q3
Position
D.E. Shaw & Co. added2025-11-14
+31,064 shares · 2025Q3
Position
T. Rowe Price trimmed2025-11-14
−1,339,567 shares · 2025Q3
Position
Wellington Management added2025-11-14
+324,653 shares · 2025Q3
Position
Ron Baron (Baron Capital / BAMCO) trimmed2025-11-14
−13,039 shares · 2025Q3
Position
Sands Capital Management opened position2025-11-13
+16,625 shares · 2025Q3
Position

Insider activity

No insider transactions in the last 30 days.

View full insider history for ARGX →

Follow-the-investor returns

If you'd copied each holder of ARGX…

Cost basis inferred from each manager's quarter-over-quarter position changes. Sorted by % return on the position they're still holding.

Investor	First in	Cost basis	Return	Position value today
Ron Baron (Baron Capital / BAMCO)	2017Q4	$243.37	+248.9%	$130.5M
T. Rowe Price	2017Q2	$265.12	+220.2%	$2.85B
Wellington Management	2019Q4	$544.97	+55.8%	$576.7M
Izzy Englander (Millennium Mgmt)	2017Q4	$575.70	+47.5%	$51.3M
Steve Cohen (Point72)	2018Q1	$583.86	+45.4%	$3.8M
Steve Cohen (Point72)	2018Q1	$583.86	+45.4%	$3.8M
AQR Capital Management	2024Q4	$691.39	+22.8%	$2.0M
Paul Tudor Jones (Tudor Investment)	2021Q2	$703.20	+20.7%	$1.8M
Two Sigma Investments	2025Q1	$715.83	+18.6%	$219.5M
D.E. Shaw & Co.	2018Q2	$816.44	+4.0%	$3.1M
D.E. Shaw & Co.	2018Q2	$816.44	+4.0%	$3.1M
D.E. Shaw & Co.	2018Q2	$816.44	+4.0%	$3.1M
Ken Griffin (Citadel Advisors)	2019Q1	$833.53	+1.9%	$297.9M
Ken Griffin (Citadel Advisors)	2019Q1	$833.53	+1.9%	$297.9M
Ken Griffin (Citadel Advisors)	2019Q1	$833.53	+1.9%	$297.9M
Sands Capital Management	2025Q3	$836.13	+1.5%	$303.0M

Who moved on this name in 2025Q4

Position changes reported for the latest quarter, grouped by direction.

New positions2

Steve Cohen (Point72)
+9,500
$8.0M
Paul Tudor Jones (Tudor Investment)
+2,148
$1.8M

Added to2

Sands Capital Management
+340,245
$286.1M
AQR Capital Management
+469
$394K

Trimmed7

Ken Griffin (Citadel Advisors)
−362,708
$305.0M
Izzy Englander (Millennium Mgmt)
−287,060
$241.4M
D.E. Shaw & Co.
−123,495
$103.9M
Wellington Management
−50,750
$42.7M
Two Sigma Investments
−35,604
$29.9M
Ron Baron (Baron Capital / BAMCO)
−13,975
$11.8M
T. Rowe Price
−278,085
$234K

Exited0

—

Institutional ownership over time

Distinct super-investors holding this ticker · combined dollar value, by quarter.

Quarter	Holders	Shares	Combined value	Δ holders
2022Q1	10	8,660,540	$2.73B	—
2022Q2	12	8,573,198	$3.25B	+2
2022Q3	11	6,456,381	$2.28B	-1
2022Q4	12	5,990,792	$2.27B	+1
2023Q1	11	5,610,251	$2.09B	-1
2023Q2	12	5,968,640	$2.33B	+1
2023Q3	13	6,332,523	$3.11B	+1
2023Q4	11	5,918,361	$2.25B	-2
2024Q1	13	7,519,279	$2.96B	+2
2024Q2	14	8,256,068	$3.55B	+1
2024Q3	12	7,500,522	$4.07B	-2
2024Q4	10	6,858,869	$4.22B	-2
2025Q1	12	7,259,408	$4.30B	+2
2025Q2	12	7,152,614	$3.94B	—
2025Q3	13	6,225,211	$4.59B	+1
2025Q4	16	5,411,396	$4.55B	+3

Who owns ARGX

16 super-investors · 2025Q4

Tracked stake

5.41M

Combined value

$4.55B

% of shares outstanding

—

shares-out unknown

Quarter action mix

New3Added2Trim11

#	Manager	Shares	Value	% of book	Last action
1	T. Rowe Price	3.36M	$2.83B	0.3%	Trim−278.1K
2	Wellington Management	679.2K	$571M	0.1%	Trim−50.8K
3	Sands Capital Management	356.9K	$300M	0.9%	Added+340.2K
4	Ken Griffin Citadel Advisors	350.9K	$295M	0.0%	Trim−362.7K
5	Two Sigma Investments	258.6K	$217M	0.3%	Trim−35.6K
6	Ron Baron Baron Capital / BAMCO	153.7K	$129M	0.4%	Trim−14.0K
7	D.E. Shaw & Co.	75.5K	$63M	0.0%	Trim−123.5K
8	Izzy Englander Millennium Mgmt	60.5K	$51M	0.0%	Trim−287.1K
9	D.E. Shaw & Co.	45.5K	$38M	0.0%	Trim−123.5K
10	Ken Griffin Citadel Advisors	26.6K	$22M	0.0%	Trim−362.7K
11	Ken Griffin Citadel Advisors	24.1K	$20M	0.0%	Trim−362.7K
12	Steve Cohen Point72	5.0K	$4M	0.0%	New+9.5K
13	Steve Cohen Point72	4.5K	$4M	0.0%	New+9.5K
14	D.E. Shaw & Co.	3.6K	$3M	0.0%	Trim−123.5K
15	AQR Capital Management	2.4K	$2M	0.0%	Added+469
16	Paul Tudor Jones Tudor Investment	2.1K	$2M	0.0%	New+2.1K

Recent moves

20 transactions

TRIMT. Rowe Price
−278,085 · 2025Q4
NEWSteve Cohen (Point72)
+9,500 · 2025Q4
NEWPaul Tudor Jones (Tudor Investment)
+2,148 · 2025Q4
TRIMD.E. Shaw & Co.
−123,495 · 2025Q4
ADDAQR Capital Management
+469 · 2025Q4
TRIMTwo Sigma Investments
−35,604 · 2025Q4
TRIMKen Griffin (Citadel Advisors)
−362,708 · 2025Q4
TRIMWellington Management
−50,750 · 2025Q4
TRIMIzzy Englander (Millennium Mgmt)
−287,060 · 2025Q4
TRIMRon Baron (Baron Capital / BAMCO)
−13,975 · 2025Q4
ADDSands Capital Management
+340,245 · 2025Q4
ADDD.E. Shaw & Co.
+31,064 · 2025Q3
ADDAQR Capital Management
+920 · 2025Q3
TRIMIzzy Englander (Millennium Mgmt)
−82,326 · 2025Q3
TRIMRon Baron (Baron Capital / BAMCO)
−13,039 · 2025Q3
ADDTwo Sigma Investments
+250,278 · 2025Q3
TRIMT. Rowe Price
−1,339,567 · 2025Q3
ADDWellington Management
+324,653 · 2025Q3
NEWSands Capital Management
+16,625 · 2025Q3
TRIMT. Rowe Price
−404,610 · 2025Q2

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