Assenagon Asset Management’s Idexx Laboratories IDXX Stock Holding History

Assenagon Asset 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	$96.5M	Buy	183,233 +97,398	+113%	+$54.6M	0.12%	140
2026 Q1	$48.2M	Buy	85,835 +10,226	+14%	+$6.56M	0.07%	203
2025 Q4	$51.2M	Buy	75,609 +19,741	+35%	+$13.4M	0.07%	210
2025 Q3	$35.7M	Sell	55,868 -6,863	-11%	-$4.17M	0.05%	275
2025 Q2	$33.6M	Sell	62,731 -143,820	-70%	-$68.8M	0.05%	272
2025 Q1	$86.7M	Sell	206,551 -228,498	-53%	-$99.2M	0.14%	125
2024 Q4	$180M	Buy	435,049 +316,048	+266%	+$139M	0.29%	66
2024 Q3	$60.1M	Buy	119,001 +35,750	+43%	+$17.4M	0.11%	159
2024 Q2	$40.6M	Sell	83,251 -32,079	-28%	-$16.1M	0.09%	169
2024 Q1	$62.3M	Buy	115,330 +71,737	+165%	+$39.2M	0.15%	105
2023 Q4	$24.2M	Buy	43,593 +8,831	+25%	+$4.15M	0.06%	255
2023 Q3	$15.2M	Buy	34,762 +11,104	+47%	+$5.54M	0.05%	302
2023 Q2	$11.9M	Sell	23,658 -2,357	-9%	-$1.13M	0.04%	325
2023 Q1	$13M	Buy	26,015 +16,133	+163%	+$7.72M	0.05%	321
2022 Q4	$4.03M	Sell	9,882 -8,628	-47%	-$3.35M	0.01%	582
2022 Q3	$6.03M	Sell	18,510 -368,243	-95%	-$135M	0.02%	444
2022 Q2	$136M	Buy	386,753 +382,948	+10,064%	+$156M	0.5%	34
2022 Q1	$2.08M	Sell	3,805 -86,959	-96%	-$45.7M	0.01%	829
2021 Q4	$59.8M	Buy	90,764 +66,824	+279%	+$41.9M	0.17%	93
2021 Q3	$14.9M	Sell	23,940 -6,362	-21%	-$4.27M	0.05%	241
2021 Q2	$19.1M	Buy	30,302 +24,990	+470%	+$13.8M	0.07%	235
2021 Q1	$2.6M	Sell	5,312 -14,978	-74%	-$7.5M	0.01%	654
2020 Q4	$10.1M	Buy	20,290 +8,763	+76%	+$3.92M	0.04%	244
2020 Q3	$4.53M	Buy	11,527 +6,436	+126%	+$2.38M	0.03%	352
2020 Q2	$1.68M	Sell	5,091 -1,414	-22%	-$409K	0.01%	654
2020 Q1	$1.58M	Sell	6,505 -12,892	-66%	-$3.36M	0.01%	416
2019 Q4	$5.07M	Buy	+19,397	New	+$5.11M	0.03%	238
2019 Q1	–	Sell	-2,059	Closed	-$383K	–	1019
2018 Q4	$383K	Buy	+2,059	New	+$422K	﹤0.01%	876

Other funds holding IDXX

MBI

Montrusco Bolton Investments Montreal, Quebec, Canada $6.46B AUM 26.7% 1-Year Est. Return

CAM

Congress Asset Management Boston, Massachusetts $16.3B AUM 42.69% 1-Year Est. Return

Robeco Institutional Asset Management Rotterdam, Netherlands $81.4B AUM 40.71% 1-Year Est. Return

Rathbones Group Liverpool, United Kingdom $27.1B AUM 20.2% 1-Year Est. Return

SIM

Seilern Investment Management London, United Kingdom $794M AUM 6.63% 1-Year Est. Return

MJRIC

Mogy Joel R Investment Counsel Beverly Hills, California $1.75B AUM 17.81% 1-Year Est. Return

Riverbridge Partners Minneapolis, Minnesota $3.58B AUM 4.02% 1-Year Est. Return

MIM

Manitou Investment Management Toronto, Ontario, Canada $538M AUM 13.79% 1-Year Est. Return

New York State Teachers Retirement System (NYSTRS) Albany, New York $54.2B AUM 43.77% 1-Year Est. Return

BIAS

Beacon Investment Advisory Services Morristown, New Jersey $2.69B AUM 35.07% 1-Year Est. Return

Assenagon Asset Management's IDXX Position: Q2 2026 in Review

Assenagon Asset Management increased its Idexx Laboratories (IDXX) stake by 113% in Q2 2026, buying an estimated $54.6M and bringing the position to 183,233 shares worth $96.5M. The position accounts for 0.12% of the portfolio, ranked #140.

Assenagon Asset Management first reported a position in IDXX in Q4 2018 and has held it in 28 quarters since. The position peaked at $180M in Q4 2024. 290 funds tracked by Wall St. Rank hold IDXX as of Q2 2026.

Assenagon Asset Management held 183,233 shares of Idexx Laboratories worth $96.5M as of Q2 2026.
Assenagon Asset Management bought 97,398 Idexx Laboratories shares in Q2 2026, an estimated $54.6M.
Idexx Laboratories made up 0.12% of Assenagon Asset Management's portfolio in Q2 2026, its #140 holding.
Assenagon Asset Management first reported a position in Idexx Laboratories in Q4 2018 and has held it in 28 quarters since.
Assenagon Asset Management's Idexx Laboratories position peaked at $180M in Q4 2024.
290 funds tracked by Wall St. Rank held Idexx Laboratories as of Q2 2026.

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