Ticker · CUSIP 45168D104

IDXX

IDEXX LABS INC
Healthcare·Diagnostics & Research
···Share
Holders (tracked)
20
Combined shares
4,331,283
Combined value
$2.93B
Last close
$569.95
Quarter
2025Q4
Tracked holders · last 8 quarters
+2 vs previous quarter over the last 8.
20162024Q12025Q4
Price is -15.8% vs the avg quarter-end implied price across tracked holders.

SEC event timeline

28 events
  1. Ron Baron (Baron Capital / BAMCO) trimmed2026-02-17
    −86,088 shares · 2025Q4
    Position
  2. AQR Capital Management trimmed2026-02-17
    −20,379 shares · 2025Q4
    Position
  3. Ken Griffin (Citadel Advisors) trimmed2026-02-17
    −9,733 shares · 2025Q4
    Position
  4. D.E. Shaw & Co. added2026-02-17
    +1,281 shares · 2025Q4
    Position
  5. Two Sigma Investments trimmed2026-02-17
    −2,759 shares · 2025Q4
    Position
  6. Izzy Englander (Millennium Mgmt) trimmed2026-02-17
    −60,049 shares · 2025Q4
    Position
  7. Steve Cohen (Point72) opened position2026-02-17
    +11,204 shares · 2025Q4
    Position
  8. T. Rowe Price added2026-02-17
    +258,015 shares · 2025Q4
    Position
  9. Jeremy Grantham (GMO) added2026-02-17
    +505 shares · 2025Q4
    Position
  10. Paul Tudor Jones (Tudor Investment) opened position2026-02-17
    +800 shares · 2025Q4
    Position
  11. Wellington Management added2026-02-17
    +592,834 shares · 2025Q4
    Position
  12. Ray Dalio (Bridgewater Associates) trimmed2026-02-13
    −1,246 shares · 2025Q4
    Position
  13. Wally Weitz (Weitz Investment) trimmed2026-02-12
    −21,500 shares · 2025Q4
    Position
  14. Norges Bank (Norway SWF) opened position2026-02-10
    +491,131 shares · 2025Q4
    Position
  15. Ken Fisher (Fisher Asset Mgmt) opened position2026-02-09
    +304 shares · 2025Q4
    Position
  16. Paul Tudor Jones (Tudor Investment) exited2025-12-09
    −17,927 shares · 2025Q3
    Position
  17. AQR Capital Management trimmed2025-11-14
    −88,165 shares · 2025Q3
    Position
  18. Izzy Englander (Millennium Mgmt) trimmed2025-11-14
    −15,259 shares · 2025Q3
    Position
  19. D.E. Shaw & Co. trimmed2025-11-14
    −22,304 shares · 2025Q3
    Position
  20. T. Rowe Price added2025-11-14
    +158,107 shares · 2025Q3
    Position
  21. Wellington Management trimmed2025-11-14
    −1,793 shares · 2025Q3
    Position
  22. Ron Baron (Baron Capital / BAMCO) trimmed2025-11-14
    −148,491 shares · 2025Q3
    Position
  23. Bill Nygren (Harris / Oakmark) opened position2025-11-14
    +455 shares · 2025Q3
    Position
  24. Jeremy Grantham (GMO) opened position2025-11-13
    +1,485 shares · 2025Q3
    Position
  25. Ray Dalio (Bridgewater Associates) added2025-11-13
    +4,779 shares · 2025Q3
    Position
  26. Norges Bank (Norway SWF) exited2025-11-13
    −413,832 shares · 2025Q3
    Position
  27. Norges Bank (Norway SWF) added2025-11-12
    +4,866 shares · 2024Q3
    Position
  28. Wally Weitz (Weitz Investment) trimmed2025-11-10
    −3,500 shares · 2025Q3
    Position

Insider activity

No insider transactions in the last 30 days.
View full insider history for IDXX →
Follow-the-investor returns
If you'd copied each holder of IDXX…
Cost basis inferred from each manager's quarter-over-quarter position changes. Sorted by % return on the position they're still holding.
InvestorFirst inCost basisReturnPosition value today
Ron Baron (Baron Capital / BAMCO)2016Q1$104.10+447.5%$1.02B
Wally Weitz (Weitz Investment)2025Q1$419.95+35.7%$20.1M
Ken Fisher (Fisher Asset Mgmt)2020Q2$446.36+27.7%$173K
AQR Capital Management2016Q1$461.41+23.5%$65.4M
Two Sigma Investments2016Q1$501.65+13.6%$4.0M
Paul Tudor Jones (Tudor Investment)2016Q2$527.97+8.0%$456K
T. Rowe Price2016Q1$541.89+5.2%$542.7M
Ray Dalio (Bridgewater Associates)2017Q3$601.03-5.2%$3.5M
Ken Griffin (Citadel Advisors)2016Q1$615.47-7.4%$20.3M
Ken Griffin (Citadel Advisors)2016Q1$615.47-7.4%$20.3M
Ken Griffin (Citadel Advisors)2016Q1$615.47-7.4%$20.3M
D.E. Shaw & Co.2016Q2$621.11-8.2%$931K
Wellington Management2017Q1$623.21-8.5%$444.1M
Bill Nygren (Harris / Oakmark)2025Q3$638.89-10.8%$259K
Steve Cohen (Point72)2017Q3$646.15-11.8%$6.4M
Jeremy Grantham (GMO)2025Q3$648.44-12.1%$1.1M
Izzy Englander (Millennium Mgmt)2016Q1$655.54-13.1%$7.7M
Izzy Englander (Millennium Mgmt)2016Q1$655.54-13.1%$7.7M
Izzy Englander (Millennium Mgmt)2016Q1$655.54-13.1%$7.7M
Norges Bank (Norway SWF)2016Q1$10070.74-94.3%$279.9M

Who moved on this name in 2025Q4

Position changes reported for the latest quarter, grouped by direction.
New positions4
Added to4
Trimmed7
Exited0
—

Institutional ownership over time

Distinct super-investors holding this ticker · combined dollar value, by quarter.
QuarterHoldersCombined value
2022Q1
19
$427.17B
2022Q2
22
$276.44B
2022Q3
22
$4.32B
2022Q4
18
$5.26B
2023Q1
18
$6.82B
2023Q2
19
$6.30B
2023Q3
18
$5.53B
2023Q4
16
$7.42B
2024Q1
16
$7.18B
2024Q2
21
$7.05B
2024Q3
21
$2.66B
2024Q4
21
$2.10B
2025Q1
21
$2.08B
2025Q2
20
$2.04B
2025Q3
18
$2.04B
2025Q4
20
$2.93B
Congress members trading this stock
DateMemberTypeAmount rangeFiling
2026-01-13April McClain DelaneySell$1K – $15KPDF ↗
2025-10-16April McClain DelaneySell (P)$1K – $15KPDF ↗
2025-09-04Byron DonaldsBuy$1K – $15KPDF ↗
2025-09-04Byron DonaldsBuy$1K – $15KPDF ↗
2025-08-07April McClain DelaneySell (P)$1K – $15KPDF ↗
2025-07-09April McClain DelaneySell (P)$1K – $15KPDF ↗
2025-05-15Rob BresnahanBuy$1K – $15KPDF ↗
2025-04-09April McClain DelaneyBuy$1K – $15KPDF ↗
2025-04-08Rob BresnahanSell$1K – $15KPDF ↗
2025-04-07April McClain DelaneyBuy$1K – $15KPDF ↗
2025-04-04April McClain DelaneyBuy$1K – $15KPDF ↗
2025-04-01April McClain DelaneyBuy$1K – $15KPDF ↗

Who owns IDXX

20 super-investors · 2025Q4
Tracked stake
4.33M
shares
Combined value
$2.93B
% of shares outstanding
—
shares-out unknown
Quarter action mix
New4Added4Trim11Held1
#ManagerSharesValue
1Ron Baron
Baron Capital / BAMCO
1.80M$1.22B
2T. Rowe Price952.2K$644M
3Wellington Management779.2K$527M
4Norges Bank
Norway SWF
491.1K$332M
5AQR Capital Management114.8K$78M
6Izzy Englander
Millennium Mgmt
41.3K$28M
7Ken Griffin
Citadel Advisors
35.7K$24M
8Wally Weitz
Weitz Investment
35.3K$24M
9Ken Griffin
Citadel Advisors
19.3K$13M
10Ken Griffin
Citadel Advisors
17.8K$12M
11Izzy Englander
Millennium Mgmt
13.5K$9M
12Steve Cohen
Point72
11.2K$8M
13Two Sigma Investments6.9K$5M
14Ray Dalio
Bridgewater Associates
6.2K$4M
15Izzy Englander
Millennium Mgmt
3.5K$2M
16Jeremy Grantham
GMO
2.0K$1M
17D.E. Shaw & Co.1.6K$1M
18Paul Tudor Jones
Tudor Investment
800$541K
19Bill Nygren
Harris / Oakmark
455$308K
20Ken Fisher
Fisher Asset Mgmt
304$206K

Recent moves

20 transactions
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