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Seilern Investment Management’s Idexx Laboratories IDXX Stock Holding History

Seilern Investment Management’s Portfolio IDXX Stock Details IDXX Fund Activity
Bought
Maintained
Sold
Quarter Market Value Status Shares Change in
Stake 		Trade Value Portfolio Weight Portfolio Position
2026
Q2 		$51.4M Buy
97,560
+16,729
+21% +$9.38M 6.47% 5
2026
Q1 		$45.4M Sell
80,831
-19,959
-20% -$12.8M 5.42% 10
2025
Q4 		$68.2M Sell
100,790
-40,486
-29% -$27.6M 5.29% 13
2025
Q3 		$90.3M Sell
141,276
-70,900
-33% -$43M 6.52% 5
2025
Q2 		$114M Sell
212,176
-53,773
-20% -$25.7M 7.51% 4
2025
Q1 		$112M Sell
265,949
-7,618
-3% -$3.31M 7.3% 4
2024
Q4 		$113M Buy
+273,567
New +$120M 6.44% 5

Other funds holding IDXX

BlackRock
BlackRock New York $6.73T AUM 46.02% 1-Year Est. Return
Vanguard Capital Management
Vanguard Capital Management Malvern, Pennsylvania $4.68T AUM
Vanguard Portfolio Management
Vanguard Portfolio Management Malvern, Pennsylvania $2.22T AUM
State Street
State Street Boston, Massachusetts $3.37T AUM 44.26% 1-Year Est. Return
Invesco
Invesco Atlanta, Georgia $1.26T AUM 61.52% 1-Year Est. Return
Geode Capital Management
Geode Capital Management Boston, Massachusetts $1.88T AUM 44.46% 1-Year Est. Return
BAMCO Inc
BAMCO Inc New York $66.6B AUM 7.35% 1-Year Est. Return
Morgan Stanley
Morgan Stanley New York $1.89T AUM 35.08% 1-Year Est. Return
Bank of New York Mellon
Bank of New York Mellon New York $609B AUM 40.19% 1-Year Est. Return
Arrowstreet Capital
Arrowstreet Capital Boston, Massachusetts $225B AUM 49.49% 1-Year Est. Return

Seilern Investment Management's IDXX Position: Q2 2026 in Review

Seilern Investment Management increased its Idexx Laboratories (IDXX) stake by 21% in Q2 2026, buying an estimated $9.38M and bringing the position to 97,560 shares worth $51.4M. The position accounts for 6.47% of the portfolio, ranked #5.

Seilern Investment Management first reported a position in IDXX in Q4 2024 and has held it in 7 quarters since. The position peaked at $114M in Q2 2025. 1,293 funds tracked by Wall St. Rank hold IDXX as of Q2 2026.

  • Seilern Investment Management held 97,560 shares of Idexx Laboratories worth $51.4M as of Q2 2026.
  • Seilern Investment Management bought 16,729 Idexx Laboratories shares in Q2 2026, an estimated $9.38M.
  • Idexx Laboratories made up 6.47% of Seilern Investment Management's portfolio in Q2 2026, its #5 holding.
  • Seilern Investment Management first reported a position in Idexx Laboratories in Q4 2024 and has held it in 7 quarters since.
  • Seilern Investment Management's Idexx Laboratories position peaked at $114M in Q2 2025.
  • 1,293 funds tracked by Wall St. Rank held Idexx Laboratories as of Q2 2026.

Based on Seilern Investment Management's 13F filing for Q2 2026, filed 8 Jul 2026.