Jonathan Jay Mazelsky's Net Worth

$80.9 Million

Estimate Recalculated Dec 3, 2025 08:10PM EST

Who is Jonathan Jay Mazelsky

Jonathan Jay Mazelsky has an estimated net worth of $80.9 Million. This is based on reported shares across multiple companies, which include IDEXX LABORATORIES INC /DE, and DENTSPLY SIRONA Inc..

SEC CIK

Jonathan Jay Mazelsky's CIK is 0001556270

Past Insider Trading and Trends

2023 was Jonathan Jay Mazelsky's most active year for acquiring shares with 21 total transactions. Jonathan Jay Mazelsky's most active month to acquire stocks was the month of January. 2020 was Jonathan Jay Mazelsky's most active year for disposing of shares, totalling 34 transactions. Jonathan Jay Mazelsky's most active month to dispose stocks was the month of January. 2021 saw Jonathan Jay Mazelsky paying a total of $1,400,078.75 for 60,301 shares, this is the most they've acquired in one year. In 2023 Jonathan Jay Mazelsky cashed out on 54,334 shares for a total of $11,450,557.23, their largest year based on trade value.

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IDEXX LABORATORIES INC /DE

President and CEO
Updated Aug 07, 2024
Form 4
-0.21%
-170.00
$455.08
-$77.36K
Aug 07, 2024
81.73K
Options
Aug 05
Form 4
-0.67%
-550.00
Mar 04, 2024
81.50K
Grant
Feb 29
Form 4
$206.94
$99.95K
Feb 22, 2024
82.05K
Options
Feb 21
Form 4
22.38%
19.67K
$560.56
-$1.03M
Feb 16, 2024
108.98K
Options
Feb 14
Form 4
-9.96%
-12.00K
$320.23
-$6.06M
Feb 09, 2024
108.51K
Sale
Feb 07
Form 4
-8.25%
-7.13K
$296.29
-$2.59M
Dec 06, 2023
79.23K
Sale
Dec 04
Form 4
-13.45%
-13.42K
$295.77
-$5.81M
Sep 05, 2023
86.35K
Sale
Aug 31
Form 4
-0.20%
-170.00
$504.08
-$85.69K
Aug 08, 2023
83.37K
Options
Aug 05
Form 4
-0.82%
-602.00
May 19, 2023
72.70K
Grant
May 18
Form 4
$178.26
$99.83K
May 05, 2023
73.30K
Options
May 04
Form 4
-1.94%
-1.66K
$503.65
-$834.55K
Feb 16, 2023
83.55K
Options
Feb 14
Form 4
380.74%
38.04K
Feb 10, 2023
118.85K
Grant
Feb 08
Form 4
-12.91%
-10.50K
$248.24
-$3.38M
Nov 16, 2022
70.80K
Sale
Nov 14
Form 4
-17.51%
-13.23K
$217.25
-$3.81M
Nov 09, 2022
62.31K
Sale
Nov 07
Form 4
-0.29%
-179.00
$407.78
-$72.99K
Aug 08, 2022
61.51K
Options
Aug 05
Form 4
$141.60
$99.97K
May 23, 2022
51.30K
Options
May 20
Form 4
-0.98%
-500.00
Mar 07, 2022
50.59K
Grant
Mar 04
Form 4
63.56%
37.53K
$505.53
-$719.37K
Feb 16, 2022
96.58K
Options
Feb 14
Form 4
-10.83%
-6.00K
$675.21
-$4.05M
Aug 17, 2021
49.43K
Sale
Aug 13 - Aug 16
Form 4
-0.27%
-179.00
$705.76
-$126.33K
Aug 09, 2021
65.03K
Options
Aug 05
Form 4
-0.90%
-500.00
May 20, 2021
55.21K
Grant
May 18
Form 4
$67.85
$100.08K
Feb 24, 2021
55.70K
Options
Feb 22
Form 4
-6.45%
-13.87K
$294.58
-$6.15M
Feb 19, 2021
201.12K
Sale
Feb 17
Form 4
55.79%
28.88K
$544.08
-$787.28K
Feb 17, 2021
80.65K
Options
Feb 14
Form 4
-12.30%
-5.81K
$269.50
-$2.24M
Nov 09, 2020
41.41K
Sale
Nov 05 - Nov 06
Form 4
-0.33%
-179.00
$395.71
-$70.83K
Aug 07, 2020
54.68K
Options
Aug 05
Form 4
82.04%
42.76K
$288.78
-$349.42K
Feb 19, 2020
94.89K
Options
Feb 14
Form 4
-15.78%
-8.00K
$161.84
-$1.59M
Feb 07, 2020
42.69K
Sale
ScheduledFeb 05
Form 4
$45.84
$100.30K
Jan 16, 2020
36.86K
Options
ScheduledJan 15
Form 4
27.99K
Nov 05, 2019
62.64K
Options
Nov 04
Form 4
$47.20
$536.12K
Aug 09, 2019
48.45K
Options
Aug 08
Form 4
21.19%
12.04K
$152.12
-$2.13M
Aug 07, 2019
68.85K
Sell-Options
Aug 05
Form 4
77.26%
22.65K
$206.94
-$157.69K
Feb 19, 2019
51.96K
Options
Feb 14
Form 4
-1.50%
-446.00
$196.80
-$87.77K
Dec 07, 2018
29.29K
Options
Dec 05
Form 4
98.40%
27.45K
$178.26
-$138.69K
Feb 16, 2018
55.34K
Options
Feb 14
Form 4
-1.66%
-471.00
$159.78
-$75.26K
Dec 07, 2017
27.85K
Options
Dec 05
Form 4
-4.00%
-1.18K
$154.98
-$182.88K
Sep 06, 2017
28.28K
Options
Sep 01
Form 4
92.11%
25.61K
$141.60
-$101.81K
Feb 16, 2017
53.41K
Options
Feb 14
Form 4
-1.11%
-311.00
$114.10
-$35.49K
Dec 07, 2016
27.75K
Options
Dec 05
Form 4
$47.53
$104.76K
Nov 21, 2016
21.25K
Options
Nov 18
Form 4
-2.88%
-765.00
$113.16
-$86.57K
Sep 02, 2016
25.79K
Options
Sep 01
Form 4
197.73%
45.91K
$67.85
-$34.47K
Feb 17, 2016
69.13K
Options
Feb 14
Form 4
-1.33%
-311.00
$70.40
-$21.89K
Dec 08, 2015
23.14K
Options
Dec 05
Form 4
-3.17%
-765.00
$70.54
-$53.96K
Sep 03, 2015
23.37K
Options
Sep 01
Form 4
137.11%
15.05K
$159.08
-$28.00K
Feb 18, 2015
26.04K
Options
Feb 14
Form 4
$95.06
$95.06K
Dec 29, 2014
7.62K
Options
Dec 23
Form 4
-1.54%
-155.00
$148.62
-$23.04K
Dec 09, 2014
9.94K
Options
Dec 05
Form 4
-3.67%
-383.00
$123.97
-$47.48K
Sep 03, 2014
10.05K
Options
Sep 01
Form 4
119.08%
11.21K
$124.00
-$12.65K
Feb 19, 2014
20.63K
Options
Feb 14 - Feb 14
Form 4
441.35%
26.91K
Dec 09, 2013
33.00K
Grant
Dec 05
Form 4
-5.26%
-383.00
$93.82
-$35.93K
Sep 04, 2013
6.90K
Options
Sep 01
Form 4
261.47%
15.47K
Feb 19, 2013
21.39K
Grant
Feb 14
Form 4
12.60K
Sep 05, 2012
12.60K
Grant
Sep 01
Form 3
Aug 16, 2012
Showing 54 results

DENTSPLY SIRONA Inc.

Investor
Updated Oct 15, 2024
Form 4
0.57%
103.22
$24.50
$559.73
Oct 15, 2024
18.13K
Grant
Oct 11
Form 4
0.64%
108.28
$25.80
$556.24
Jul 15, 2024
17.09K
Grant
Jul 12
Form 4
40.08%
994.76
$25.13
$25.00K
Jul 01, 2024
3.48K
Grant
Jun 28
Form 4
145.13%
7.99K
May 24, 2024
13.50K
Grant
May 23
Form 4
0.49%
38.99
$31.45
$395.01
Apr 15, 2024
7.99K
Grant
Apr 12
Form 4
44.59%
761.48
$32.83
$25.00K
Mar 29, 2024
2.47K
Grant
Mar 28
Form 4
0.39%
27.95
$36.80
$238.19
Jan 16, 2024
7.19K
Grant
Jan 12
Form 4
70.38%
702.71
$35.58
$25.00K
Jan 02, 2024
1.70K
Grant
Dec 29
Form 4
0.42%
26.82
$30.71
$139.15
Oct 16, 2023
6.46K
Grant
Oct 13
Form 4
275.53%
729.24
$34.28
$25.00K
Oct 02, 2023
993.91
Grant
Sep 29
Form 4
0.35%
19.85
$41.14
$36.93
Jul 17, 2023
5.70K
Grant
Jul 14
Form 4
263.77
$39.58
$10.44K
Jun 29, 2023
263.77
Grant
Jun 28
Form 4
5.42K
May 26, 2023
5.42K
Grant
May 25
Form 3
May 24, 2023
Showing 14 results