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TECX · 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.

TECXARGX
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.
  • TECX
  • ARGX
0102030202120222023202420252026
Holders and value by quarter
QuarterTECXARGX
Q3 2020none listed holders, n.a.8 holders, $3.6bn
Q4 2020none listed holders, n.a.7 holders, $4.1bn
Q1 2021none listed holders, n.a.8 holders, $4.1bn
Q2 2021none listed holders, n.a.9 holders, $4.6bn
Q3 2021none listed holders, n.a.8 holders, $4.5bn
Q4 2021none listed holders, n.a.9 holders, $5.3bn
Q1 2022none listed holders, n.a.8 holders, $5.3bn
Q2 2022none listed holders, n.a.13 holders, $6.5bn
Q3 2022none listed holders, n.a.14 holders, $5.3bn
Q4 2022none listed holders, n.a.13 holders, $5.5bn
Q1 2023none listed holders, n.a.13 holders, $5.9bn
Q2 2023none listed holders, n.a.18 holders, $6.6bn
Q3 2023none listed holders, n.a.21 holders, $8.7bn
Q4 2023none listed holders, n.a.17 holders, $6.3bn
Q1 2024none listed holders, n.a.13 holders, $6.8bn
Q2 20241 holders, $7.1m14 holders, $7.9bn
Q3 20242 holders, $18m13 holders, $10.7bn
Q4 20242 holders, $39m14 holders, $12.3bn
Q1 20252 holders, $20m17 holders, $11.8bn
Q2 20251 holders, $17m18 holders, $10.8bn
Q3 20251 holders, $10m16 holders, $13.8bn
Q4 2025none listed holders, n.a.16 holders, $14.8bn
Q1 2026none listed holders, n.a.11 holders, $12.3bn
Q2 2026none listed holders, n.a.14 holders, $15.0bn
TECX

Tectonic Therapeutic Inc

Holders
2
Reported value
$20m
Buyers
2
Sellers
0

Breadth +2 among 95 comparable managers.

Pharmaceuticals and biotechnologyBiological productsHealthcare: biopharma and medtech · L3VLUP
ARGX

Argenx Se

Holders
17
Reported value
$11.8bn
Buyers
9
Sellers
9

Breadth 0 among 95 comparable managers.

Pharmaceuticals and biotechnologyBiological productsHealthcare: biopharma and medtech · L3VLUP

Who holds both, Q1 2025

Among the 18 tracked managers listing any of them. "Only" is about listed positions: a manager may hold the other below its listed range.

Only TECX (1)

Farallon Capital Management LLC

Only ARGX (16)

Artisan Partners LP, Capital World Investors, Citadel Advisors LLC, D. E. Shaw & Co., Fidelity (FMR LLC), Holocene Advisors LP, Janus Henderson Group Ltd, Marshall Wace LLP, Millennium Management LLC, Moore Capital Management LP, T. Rowe Price Associates Inc, Two Sigma Advisers LP, Two Sigma Investments LP, Verition Fund Management LLC, Voloridge Investment Management LLC, Wellington Management Group LLP

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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