Loomis, Sayles & Company
ARGX icon

Loomis, Sayles & Company’s argenx ARGX Stock Holding History

Loomis, Sayles & Company’s Portfolio ARGX Stock Details ARGX Fund Activity
Bought
Maintained
Sold
Quarter Market Value Status Shares Change in
Stake 		Trade Value Portfolio Weight Portfolio Position
2026
Q1 		$1.15M Buy
+1,574
New +$1.23M ﹤0.01% 494
2025
Q4 		– Sell
-1,441
Closed -$1.06M – 704
2025
Q3 		$1.06M Buy
+1,441
New +$950K ﹤0.01% 483
2023
Q4 		– Sell
-86
Closed -$42K – 973
2023
Q3 		$42K Sell
86
-16
-16% -$7.83K ﹤0.01% 628
2023
Q2 		$40K Hold
102
– – ﹤0.01% 647
2023
Q1 		$38K Buy
102
+30
+42% +$11.1K ﹤0.01% 656
2022
Q4 		$27K Sell
72
-45,861
-100% -$17.2M ﹤0.01% 708
2022
Q3 		$16.2M Sell
45,933
-28,060
-38% -$10.4M 0.03% 241
2022
Q2 		$28M Sell
73,993
-14,877
-17% -$4.79M 0.05% 184
2022
Q1 		$28M Buy
88,870
+10,933
+14% +$3.18M 0.04% 240
2021
Q4 		$27.3M Buy
77,937
+7,142
+10% +$2.17M 0.03% 266
2021
Q3 		$21.4M Buy
70,795
+1,972
+3% +$625K 0.03% 295
2021
Q2 		$20.7M Buy
68,823
+2,694
+4% +$766K 0.03% 299
2021
Q1 		$18.2M Buy
66,129
+139
+0.2% +$43.9K 0.02% 299
2020
Q4 		$19.4M Sell
65,990
-8,799
-12% -$2.42M 0.03% 260
2020
Q3 		$19.6M Sell
74,789
-11,790
-14% -$2.83M 0.03% 235
2020
Q2 		$19.5M Sell
86,579
-184,579
-68% -$32.8M 0.03% 224
2020
Q1 		$35.7M Sell
271,158
-43,637
-14% -$6.39M 0.07% 98
2019
Q4 		$50.5M Sell
314,795
-6,975
-2% -$943K 0.09% 94
2019
Q3 		$36.7M Buy
321,770
+44,226
+16% +$5.98M 0.07% 116
2019
Q2 		$39.3M Buy
277,544
+6,016
+2% +$764K 0.07% 117
2019
Q1 		$33.9M Buy
271,528
+2,456
+0.9% +$289K 0.07% 120
2018
Q4 		$25.9M Buy
269,072
+20,509
+8% +$1.82M 0.06% 137
2018
Q3 		$18.9M Buy
248,563
+66,811
+37% +$5.92M 0.04% 232
2018
Q2 		$15.1M Buy
181,752
+15,507
+9% +$1.39M 0.03% 314
2018
Q1 		$13.4M Buy
+166,245
New +$12.6M 0.03% 351

Other funds holding ARGX

Fidelity Investments
Fidelity Investments Boston, Massachusetts $1.9T AUM 41.92% 1-Year Est. Return
T. Rowe Price Associates
T. Rowe Price Associates Baltimore, Maryland $865B AUM 30.76% 1-Year Est. Return
Janus Henderson Group
Janus Henderson Group London, United Kingdom $209B AUM 37.72% 1-Year Est. Return
Capital World Investors
Capital World Investors Los Angeles, California $733B AUM 35.63% 1-Year Est. Return
Artisan Partners
Artisan Partners Milwaukee, Wisconsin $62.3B AUM 26.25% 1-Year Est. Return
Wellington Management Group
Wellington Management Group Boston, Massachusetts $535B AUM 26.23% 1-Year Est. Return
ACA
Avoro Capital Advisors New York $10.2B AUM 149.19% 1-Year Est. Return
BlackRock
BlackRock New York $5.72T AUM 30.48% 1-Year Est. Return
RI
RTW Investments New York $10B AUM 135.35% 1-Year Est. Return
Invesco
Invesco Atlanta, Georgia $1.02T AUM 30.18% 1-Year Est. Return

Loomis, Sayles & Company's ARGX Position: Q1 2026 in Review

Loomis, Sayles & Company opened a new position in argenx (ARGX) in Q1 2026: 1,574 shares worth $1.15M. The stake represents ﹤0.01% of the portfolio and ranks #494 among its holdings. This is a return to the name: Loomis, Sayles & Company previously reported a position in ARGX as recently as Q3 2025.

Loomis, Sayles & Company first reported a position in ARGX in Q1 2018 and has held it in 25 quarters since. The position peaked at $50.5M in Q4 2019. 476 funds tracked by Wall St. Rank hold ARGX as of Q1 2026.

  • Loomis, Sayles & Company held 1,574 shares of argenx worth $1.15M as of Q1 2026.
  • argenx was a new Loomis, Sayles & Company position in Q1 2026.
  • argenx made up ﹤0.01% of Loomis, Sayles & Company's portfolio in Q1 2026, its #494 holding.
  • Loomis, Sayles & Company first reported a position in argenx in Q1 2018 and has held it in 25 quarters since.
  • Loomis, Sayles & Company's argenx position peaked at $50.5M in Q4 2019.
  • 476 funds tracked by Wall St. Rank held argenx as of Q1 2026.

Based on Loomis, Sayles & Company's 13F filing for Q1 2026, filed 14 May 2026.