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HALO · ARGX in the 13F filings

Two to four stocks side by side among the 95 tracked managers: who lists them, how that has moved, who bought and sold in a quarter, and which managers hold more than one.

HALOARGX
Quarter
Q2 2026Q1 2026Q4 2025Q3 2025Q2 2025Q1 2025Q4 2024Q3 2024Q2 2024Q1 2024Q4 2023

Holders over time

Tracked managers listing each stock every quarter, at least, or their combined reported value. A gap is a quarter in which no tracked manager listed it. Click a quarter to compare there.
  • HALO
  • ARGX
0102030202120222023202420252026
Holders and value by quarter
QuarterHALOARGX
Q3 20208 holders, $540m8 holders, $3.6bn
Q4 20209 holders, $752m7 holders, $4.1bn
Q1 20217 holders, $712m8 holders, $4.1bn
Q2 20217 holders, $769m9 holders, $4.6bn
Q3 20217 holders, $648m8 holders, $4.5bn
Q4 20218 holders, $635m9 holders, $5.3bn
Q1 20227 holders, $611m8 holders, $5.3bn
Q2 202210 holders, $634m13 holders, $6.5bn
Q3 20228 holders, $537m14 holders, $5.3bn
Q4 20229 holders, $886m13 holders, $5.5bn
Q1 20236 holders, $339m13 holders, $5.9bn
Q2 20236 holders, $394m18 holders, $6.6bn
Q3 20233 holders, $527m21 holders, $8.7bn
Q4 20236 holders, $407m17 holders, $6.3bn
Q1 20245 holders, $326m13 holders, $6.8bn
Q2 20245 holders, $384m14 holders, $7.9bn
Q3 20245 holders, $409m13 holders, $10.7bn
Q4 20248 holders, $335m14 holders, $12.3bn
Q1 20259 holders, $539m17 holders, $11.8bn
Q2 202510 holders, $422m18 holders, $10.8bn
Q3 202514 holders, $1.1bn16 holders, $13.8bn
Q4 202513 holders, $885m16 holders, $14.8bn
Q1 202611 holders, $710m11 holders, $12.3bn
Q2 202611 holders, $732m14 holders, $15.0bn
HALO

Halozyme Therapeutics Inc

Holders
13
Reported value
$885m
Buyers
13
Sellers
23

Breadth -10 among 92 comparable managers.

Pharmaceuticals and biotechnologyBiological productsHealthcare: biopharma and medtech · L3VLUP
ARGX

Argenx Se

Holders
16
Reported value
$14.8bn
Buyers
14
Sellers
16

Breadth -2 among 92 comparable managers.

Pharmaceuticals and biotechnologyBiological productsHealthcare: biopharma and medtech · L3VLUP

Who holds both, Q4 2025

Among the 24 tracked managers listing any of them. "Only" is about listed positions: a manager may hold the other below its listed range.

Only HALO (8)

Arrowstreet Capital LP, Bridgewater Associates LP, D. E. Shaw & Co., Freestone Grove Partners LP, Marshall Wace LLP, Millennium Management LLC, Renaissance Technologies LLC, Voloridge Investment Management LLC

Only ARGX (11)

Acadian Asset Management LLC, Artisan Partners LP, Balyasny Asset Management LLC, Citadel Advisors LLC, Fidelity (FMR LLC), Invesco Ltd, Moore Capital Management LP, T. Rowe Price Associates Inc, Two Sigma Advisers LP, Wellington Management Group LLP, Woodline Partners LP

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. Buyers and sellers count comparable managers (those that filed both quarters) by shares, so a rise in value with no rise in shares is the price. Large books are listed to their largest positions. These are 95 tracked managers, not the institutional market.

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