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IDXX · VRTX 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.

IDXXVRTX
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.
  • IDXX
  • VRTX
010203040202120222023202420252026
Holders and value by quarter
QuarterIDXXVRTX
Q3 202018 holders, $2.9bn31 holders, $21.9bn
Q4 202015 holders, $3.5bn30 holders, $18.4bn
Q1 202122 holders, $3.5bn31 holders, $15.4bn
Q2 202118 holders, $4.5bn30 holders, $12.7bn
Q3 202120 holders, $4.6bn35 holders, $10.1bn
Q4 202117 holders, $4.9bn28 holders, $12.4bn
Q1 202218 holders, $4.7bn23 holders, $16.1bn
Q2 202220 holders, $3.5bn25 holders, $18.1bn
Q3 202217 holders, $2.7bn22 holders, $18.4bn
Q4 202213 holders, $3.5bn28 holders, $18.4bn
Q1 202318 holders, $4.2bn26 holders, $21.4bn
Q2 202316 holders, $3.7bn27 holders, $24.7bn
Q3 202315 holders, $3.2bn33 holders, $24.3bn
Q4 202316 holders, $4.1bn32 holders, $28.6bn
Q1 202417 holders, $3.7bn31 holders, $29.8bn
Q2 202413 holders, $3.7bn29 holders, $33.4bn
Q3 202417 holders, $3.8bn27 holders, $33.5bn
Q4 202422 holders, $2.6bn26 holders, $28.5bn
Q1 202517 holders, $2.4bn21 holders, $35.4bn
Q2 202511 holders, $2.5bn21 holders, $32.3bn
Q3 202510 holders, $2.8bn22 holders, $25.9bn
Q4 202514 holders, $5.1bn26 holders, $31.8bn
Q1 202616 holders, $4.7bn25 holders, $31.8bn
Q2 202622 holders, $4.9bn26 holders, $34.6bn
IDXX

Idexx Labs Inc

Holders
17
Reported value
$2.4bn
Buyers
12
Sellers
6

Breadth +6 among 95 comparable managers.

Pharmaceuticals and biotechnologyHealthcare: biopharma and medtech · L3VLUP
VRTX

Vertex Pharmaceuticals Inc

Holders
21
Reported value
$35.4bn
Buyers
10
Sellers
11

Breadth -1 among 95 comparable managers.

Pharmaceuticals and biotechnologyHealthcare: biopharma and medtech · L3VLUPPharmaceutical preparations

Who holds both, Q1 2025

Among the 30 tracked managers listing any of them. "Only" is about listed positions: a manager may hold the other below its listed range.

Only IDXX (9)

Arrowstreet Capital LP, Bridgewater Associates LP, D. E. Shaw & Co., Durable Capital Partners LP, Man Group PLC, Tudor Investment Corp, Verition Fund Management LLC, Voloridge Investment Management LLC, Winton Group Ltd

Only VRTX (13)

ARK Investment Management LLC, Artisan Partners LP, Baillie Gifford & Co, Capital World Investors, Fidelity (FMR LLC), Hudson Bay Capital Management LP, Janus Henderson Group Ltd, MFS Investment Management, Millennium Management LLC, PDT Partners LLC, Renaissance Technologies LLC, 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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