Idexx Laboratories

By person

29 insiders · 718 transactions

38.7×

Jonathan J. Mazelsky holds 38.7 times base salary in stock. $44.59M of shares against $1.15M in salary for 2025.

Salary from the company's own proxy. The shares are what Jonathan J. Mazelsky last reported holding, valued at $532.08, the price Common Stock was last bought or sold at on the open market here, on 4 Sep 2026.

Insider

Role

Bought

Sold

Net

Holding

Of company

Worth

Change

AYERS JONATHAN W

Director

—

$311.03M (245) scheduled

−$311.03M

158,256

0.2009%

$84.21M

−70.1%

MCKEON BRIAN P

EVP, CFO and Treasurer

—

$100.51M (66) scheduled

−$100.51M

49,600

0.0630%

$26.39M

+44.8%

MAZELSKY JONATHAN JAY

President and CEO

—

$79.60M (79) scheduled

−$79.60M

83,803

0.1064%

$44.59M

+520.6%

TWIGGE GIOVANI

Senior Vice President

—

$43.99M (29) scheduled

−$43.99M

20,329

0.0258%

$10.82M

+10.5%

POLEWACZYK JAMES F

Executive Vice President

—

$35.68M (25) scheduled

−$35.68M

10,711

0.0136%

$5.70M

−28.7%

Lane Michael

Executive Vice President

—

$26.81M (33) scheduled

−$26.81M

8,024

0.0102%

$4.27M

+122.1%

SZOSTAK M ANNE

Director

—

$20.42M (32) scheduled

−$20.42M

778

0.0010%

$413.96K

−94.6%

Hunt Nimrata

Executive Vice President

—

$17.23M (14) scheduled

−$17.23M

18,141

0.0230%

$9.65M

+74.1%

FENNELL GEORGE

Executive Vice President

—

$16.66M (14) scheduled

−$16.66M

10,433

0.0132%

$5.55M

+104.6%

Turner Kathy V

Senior Vice President

—

$16.12M (24) scheduled

−$16.12M

7,380

0.0094%

$3.93M

+135.3%

HENDERSON REBECCA M

Director

—

$13.87M (14) scheduled

−$13.87M

14,696

0.0187%

$7.82M

−31.5%

JUNIUS DANIEL M

Director

—

$11.37M (11) scheduled

−$11.37M

3,561

0.0045%

$1.89M

—

Vandebroek Sophie V.

Director

—

$10.49M (13) scheduled

−$10.49M

9,078

0.0115%

$4.83M

+51.3%

Studer Jacqueline

CVP, Gen. Counsel & Secretary

—

$8.64M (16) scheduled

−$8.64M

4,389

0.0056%

$2.34M

+77.0%

Claflin Bruce L.

Director

$280.06K (2)

$6.63M (5) scheduled

−$6.35M

1,721

0.0022%

$915.71K

—

END WILLIAM T

Director

—

$4.78M (5)

−$4.78M

31,786

0.0403%

$16.91M

−40.8%

Erickson Michael G

Executive Vice President

—

$3.63M (8) scheduled

−$3.63M

15,092

0.0192%

$8.03M

+59.4%

Underberg Sharon E.

EVP, GC & Corporate Secretary

—

$3.55M (1) scheduled

−$3.55M

7,138

0.0091%

$3.80M

+2,039%

CRAIG THOMAS

Director

—

$1.02M (1) scheduled

−$1.02M

24,471

0.0311%

$13.02M

+7.8%

Kingsley Lawrence D

Director

$1.23M (5)

$1.17M (1) scheduled

+$57.64K

9,568

0.0121%

$5.09M

—

Emerson Andrew

EVP, CFO and Treasurer

—

4,421

0.0056%

$2.35M

+79.6%

Schreck Michael

Executive Vice President

—

3,089

0.0039%

$1.64M

+397.6%

Johnson Michael Perkins

Executive Vice President

—

2,795

0.0035%

$1.49M

+1,607%

ESSIG STUART

Director

—

2,236

0.0028%

$1.19M

—

Smith Martin Alexander

Executive Vice President

—

2,157

0.0027%

$1.15M

+1,702%

COLLINS Asha

Director

—

779

0.0010%

$414.49K

—

HOOLEY JOSEPH L

Director

—

325

0.0004%

$172.93K

—

Britt Irene Chang

Director

—

208

0.0003%

$110.67K

—

Peacock Karen

Director

—

102

0.0001%

$54.27K

+10,100%

Individual transactions

Insider

Date

Role

Action

Price

Amount

Emerson Andrew

20 Aug 2026

EVP, CFO and Treasurer

Exercised, kept

265

$178.26

$47.24K

Underberg Sharon E.

3 Mar 2026

EVP, GC & Corporate Secretary

Exercised, kept

197

$505.53

$99.59K

MAZELSKY JONATHAN JAY

27 Feb 2026

President and CEO

Exercised, kept

197

$505.53

$99.59K

Erickson Michael G

19 Feb 2026

Executive Vice President

Exercised, kept

197

$505.53

$99.59K

Erickson Michael G

19 Feb 2026

Executive Vice President

Exercised, kept

183

$544.08

$99.57K

Erickson Michael G

19 Feb 2026

Executive Vice President

Exercised, kept

483

$206.94

$99.95K

Erickson Michael G

19 Feb 2026

Executive Vice President

Exercised, kept

817

$178.26

$145.64K

Erickson Michael G

19 Feb 2026

Executive Vice President

Exercised, kept

719

$141.60

$101.81K

FENNELL GEORGE

9 Feb 2026

Executive Vice President

Exercised, kept

1,476

$67.85

$100.15K

Underberg Sharon E.

12 Aug 2025

EVP, GC & Corporate Secretary

Exercised, kept

183

$544.08

$99.57K

Hunt Nimrata

12 Aug 2025

Executive Vice President

Exercised, kept

183

$544.08

$99.57K

Hunt Nimrata

12 Aug 2025

Executive Vice President

Exercised, kept

483

$206.94

$99.95K

Hunt Nimrata

12 Aug 2025

Executive Vice President

Exercised, kept

560

$178.26

$99.83K

MAZELSKY JONATHAN JAY

8 Aug 2025

President and CEO

Exercised, kept

183

$598.49

$109.52K

Emerson Andrew

7 Aug 2025

EVP, CFO and Treasurer

Exercised, kept

1,849

$141.60

$261.82K

Erickson Michael G

11 Feb 2025

Executive Vice President

Exercised, kept

1,544

$67.85

$104.76K

FENNELL GEORGE

7 Feb 2025

Executive Vice President

Exercised, kept

1,256

$79.54

$99.90K

MAZELSKY JONATHAN JAY

21 Feb 2024

President and CEO

Exercised, kept

483

$206.94

$99.95K

Underberg Sharon E.

16 Feb 2024

EVP, GC & Corporate Secretary

Exercised, kept

483

$206.94

$99.95K

MCKEON BRIAN P

15 Feb 2024

EVP, CFO and Treasurer

Exercised, kept

483

$206.94

$99.95K

Lane Michael

7 Nov 2023

Executive Vice President

Exercised, kept

560

$178.26

$99.83K

Lane Michael

7 Nov 2023

Executive Vice President

Exercised, kept

706

$141.60

$99.97K

Lane Michael

7 Nov 2023

Executive Vice President

Exercised, kept

462

$67.85

$31.35K

AYERS JONATHAN W

10 May 2023

Director

Exercised, kept

560

$178.26

$99.83K

MCKEON BRIAN P

5 May 2023

EVP, CFO and Treasurer

Exercised, kept

560

$178.26

$99.83K

Underberg Sharon E.

5 May 2023

EVP, GC & Corporate Secretary

Exercised, kept

483

$206.94

$99.95K

MAZELSKY JONATHAN JAY

4 May 2023

President and CEO

Exercised, kept

560

$178.26

$99.83K

Hunt Nimrata

9 Feb 2023

Executive Vice President

Exercised, kept

706

$141.60

$99.97K

MAZELSKY JONATHAN JAY

20 May 2022

President & CEO

Exercised, kept

706

$141.60

$99.97K

TWIGGE GIOVANI

23 Feb 2022

Senior Vice President

Exercised, kept

1,893

$288.78

$546.66K

TWIGGE GIOVANI

23 Feb 2022

Senior Vice President

Exercised, kept

706

$141.60

$99.97K

AYERS JONATHAN W

18 Feb 2022

Director

Exercised, kept

706

$141.60

$99.97K

Turner Kathy V

18 Feb 2022

Senior Vice President

Exercised, kept

706

$141.60

$99.97K

Turner Kathy V

18 Feb 2022

Senior Vice President

Exercised, kept

1,474

$67.85

$100.01K

Underberg Sharon E.

17 Feb 2022

EVP, GC & Corp. Secretary

Exercised, kept

483

$206.94

$99.95K

MCKEON BRIAN P

16 Feb 2022

Executive VP & CFO

Exercised, kept

706

$141.60

$99.97K

Claflin Bruce L.

11 Oct 2021

Director

Exercised, kept

1,921

$160.28

$307.90K

Turner Kathy V

31 Aug 2021

Senior Vice President

Exercised, kept

1,256

$79.54

$99.90K

Hunt Nimrata

10 Aug 2021

Executive Vice President

Exercised, kept

337

$141.60

$47.72K

Hunt Nimrata

10 Aug 2021

Executive Vice President

Exercised, kept

769

$67.85

$52.18K

Showing 250 of 718 transactions. The figures above use every one of them.

By person

Individual transactions

What was left out