Mazelsky Jonathan Jay — Insider Trades & Holdings | InsiderBid

Mazelsky Jonathan Jay

Form 4 filings across 3 companies. Net figures count open-market buys and sales only. EDGAR profile ↗

Lifetime net: -$51.4M

Positions by company

Reported holding is the most recent post-transaction share count on a Table I row.

Every company this insider has reported trading in, with the value bought and sold at each and the date they last traded.
Ticker	Company	Bought	Sold	Net	Shares held	Last trade
XRAY	DENTSPLY SIRONA Inc.	$101.4K	$0	+$101.4K	61,668.53	Dec 31
IDXX	Idexx Laboratories INC /de	$0	$51.5M	-$51.5M	83,803.3	Nov 4
PODD	Insulet Corp	$0	$0	$0	1,496	Sep 30

DENTSPLY SIRONA Inc.

+$101.4K

Bought

$101.4K

Sold

$0

Held

61,668.53

Idexx Laboratories INC /de

-$51.5M

Bought

$0

Sold

$51.5M

Held

83,803.3

Insulet Corp

$0

Bought

$0

Sold

$0

Held

1,496

Filing record

How quickly this filer reports. Section 16 allows two business days from the transaction.

1 of 19 filings we hold was filed after the two-business-day deadline. The furthest past the deadline was 10 business days late.

Form 4 filings made after the two-business-day deadline, with the transaction date, the filing date and the number of business days between them.
Traded	Filed	Company	Past deadline	Largest line	Source
Aug 15, 2025	Sep 3, 2025	IDXXIdexx Laboratories INC /de	10days	—	Filing ↗

Idexx Laboratories INC /de

10days

Traded Aug 15, 2025 · filed Sep 3, 2025Filing ↗

Counted in business days from the transaction date, or the deemed execution date where the filing reports one, excluding weekends and federal holidays.

Trade history

The 72 most recent Form 4 transactions.

Insider transactions, newest first: date, security, transaction type, size and a link to the filing each row came from.
Date	Ticker	Company	Type	Shares	Price	Value	Δ Own	Filing
Dec 31	XRAY	DENTSPLY SIRONA Inc.	AGRANT◆⚠	2,637.95	$11.37	$30K	—	Open the original filing on SEC.gov
Nov 4	IDXX	Idexx Laboratories INC /de	MEXER◆	25,140

XRAYAGRANT◆⚠$30K

DENTSPLY SIRONA Inc.Dec 31

2,637.95 sh @ $11.37

IDXXMEXER◆—

Idexx Laboratories INC /deNov 4

25,140 sh

IDXXSSELL$235.7K

Idexx Laboratories INC /deNov 4

331 sh @ $711.95 · -0.4% own

IDXXSSELL$551.3K

Idexx Laboratories INC /deNov 4

775 sh @ $711.31 · -0.9% own

IDXXSSELL$1.1M

Idexx Laboratories INC /deNov 4

1,501 sh @ $710.12 · -1.7% own

IDXXSSELL$921.7K

Idexx Laboratories INC /deNov 4

1,300 sh @ $709.00 · -1.5% own

IDXXSSELL$1.3M

Idexx Laboratories INC /deNov 4

1,840 sh @ $707.84 · -2.1% own

IDXXSSELL$593.9K

Idexx Laboratories INC /deNov 4

840 sh @ $707.00 · -0.9% own

IDXXSSELL$169.3K

Idexx Laboratories INC /deNov 4

240 sh @ $705.59 · -0.3% own

IDXXSSELL$2.8M

Idexx Laboratories INC /deNov 4

3,950 sh @ $703.45 · -4.2% own

IDXXSSELL$1.5M

Idexx Laboratories INC /deNov 4

2,136 sh @ $702.21 · -2.2% own

IDXXSSELL$3.2M

Idexx Laboratories INC /deNov 4

4,540 sh @ $701.36 · -4.5% own

IDXXSSELL$1.2M

Idexx Laboratories INC /deNov 4

1,667 sh @ $700.33 · -1.6% own

IDXXSSELL$2.8M

Idexx Laboratories INC /deNov 4

4,075 sh @ $699.33 · -3.8% own

IDXXSSELL$1.4M

Idexx Laboratories INC /deNov 4

1,945 sh @ $698.26 · -1.8% own

IDXXMEXER$4.5M

Idexx Laboratories INC /deNov 4

25,140 sh @ $178.26 · +30.0% own

PODDAGRANT$18.4K

Insulet CorpSep 30

141 sh @ $130.47 · +10.4% own

XRAYAGRANT◆$30K

DENTSPLY SIRONA Inc.Sep 30

3,323.43 sh @ $9.03

PODDAGRANT—

Insulet CorpJul 1

1,355 sh

XRAYAGRANT◆$30K

DENTSPLY SIRONA Inc.Jun 30

2,841.83 sh @ $10.56

XRAYPBUY↺$101.4K

DENTSPLY SIRONA Inc.Jun 12

10,000 sh @ $10.14 · +19.4% own

XRAYAGRANT—

DENTSPLY SIRONA Inc.Jun 3

22,822 sh · +79.1% own

XRAYAGRANT◆$30K

DENTSPLY SIRONA Inc.Mar 31

2,644.64 sh @ $11.34

IDXXMEXER◆—

Idexx Laboratories INC /deFeb 27

197 sh

IDXXMEXER$99.6K

Idexx Laboratories INC /deFeb 27

197 sh @ $505.53 · +0.2% own

IDXXMEXER◆—

Idexx Laboratories INC /deFeb 26

23,326 sh

IDXXSSELL$1.7M

Idexx Laboratories INC /deFeb 26

2,589 sh @ $663.04 · -3.0% own

IDXXSSELL$662.2K

Idexx Laboratories INC /deFeb 26

1,000 sh @ $662.16 · -1.1% own

IDXXSSELL$793.3K

Idexx Laboratories INC /deFeb 26

1,200 sh @ $661.10 · -1.4% own

IDXXSSELL$1.9M

Idexx Laboratories INC /deFeb 26

2,859 sh @ $659.75 · -3.1% own

IDXXSSELL$2.4M

Idexx Laboratories INC /deFeb 26

3,660 sh @ $658.92 · -3.9% own

IDXXSSELL$1.9M

Idexx Laboratories INC /deFeb 26

2,860 sh @ $657.84 · -2.9% own

IDXXSSELL$882.1K

Idexx Laboratories INC /deFeb 26

1,343 sh @ $656.85 · -1.4% own

IDXXSSELL$975.9K

Idexx Laboratories INC /deFeb 26

1,488 sh @ $655.85 · -1.5% own

IDXXSSELL$727.3K

Idexx Laboratories INC /deFeb 26

1,111 sh @ $654.63 · -1.1% own

IDXXSSELL$765.5K

Idexx Laboratories INC /deFeb 26

1,171 sh @ $653.68 · -1.1% own

IDXXSSELL$1.1M

Idexx Laboratories INC /deFeb 26

1,669 sh @ $652.49 · -1.6% own

IDXXSSELL$713.4K

Idexx Laboratories INC /deFeb 26

1,095 sh @ $651.49 · -1.0% own

IDXXSSELL$833.5K

Idexx Laboratories INC /deFeb 26

1,281 sh @ $650.67 · -1.2% own

IDXXMEXER$3.3M

Idexx Laboratories INC /deFeb 26

23,326 sh @ $141.60 · +27.9% own

IDXXMEXER◆—

Idexx Laboratories INC /deFeb 14

1,099 sh

IDXXMEXER◆—

Idexx Laboratories INC /deFeb 14

958 sh

IDXXFTAX$575.9K

Idexx Laboratories INC /deFeb 14

915 sh @ $629.35 · -1.1% own

IDXXMEXER—

Idexx Laboratories INC /deFeb 14

1,099 sh · +1.3% own

IDXXMEXER—

Idexx Laboratories INC /deFeb 14

958 sh · +1.2% own

IDXXAGRANT◆—

Idexx Laboratories INC /deFeb 12

13,407 sh

XRAYAGRANT◆$1.9K

DENTSPLY SIRONA Inc.Jan 9

153.7 sh @ $12.22

XRAYAGRANT—

DENTSPLY SIRONA Inc.Jan 9

395.16 sh · +1.4% own

XRAYAGRANT◆$1.5K

DENTSPLY SIRONA Inc.Oct 10, 2025

123.36 sh @ $11.98

XRAYAGRANT—

DENTSPLY SIRONA Inc.Oct 10, 2025

359.58 sh · +1.3% own

XRAYAGRANT◆$30K

DENTSPLY SIRONA Inc.Sep 30, 2025

2,386.17 sh @ $12.57

IDXXGGIFT—

Idexx Laboratories INC /deAug 15, 2025

1,051 sh · -1.3% own

IDXXMEXER◆—

Idexx Laboratories INC /deAug 8, 2025

183 sh

IDXXMEXER$109.5K

Idexx Laboratories INC /deAug 8, 2025

183 sh @ $598.49 · +0.2% own

IDXXMEXER◆—

Idexx Laboratories INC /deAug 6, 2025

29,260 sh

IDXXSSELL$422K

Idexx Laboratories INC /deAug 6, 2025

660 sh @ $639.37 · -0.8% own

IDXXSSELL$560.4K

Idexx Laboratories INC /deAug 6, 2025

880 sh @ $636.81 · -1.0% own

IDXXSSELL$1.2M

Idexx Laboratories INC /deAug 6, 2025

1,822 sh @ $636.15 · -2.1% own

IDXXSSELL$2.2M

Idexx Laboratories INC /deAug 6, 2025

3,526 sh @ $635.13 · -3.9% own

IDXXSSELL$1.9M

Idexx Laboratories INC /deAug 6, 2025

3,000 sh @ $632.56 · -3.2% own

IDXXSSELL$4.6M

Idexx Laboratories INC /deAug 6, 2025

7,299 sh @ $631.61 · -7.3% own

IDXXSSELL$3.8M

Idexx Laboratories INC /deAug 6, 2025

6,056 sh @ $630.59 · -5.7% own

IDXXSSELL$2.1M

Idexx Laboratories INC /deAug 6, 2025

3,397 sh @ $629.82 · -3.1% own

IDXXSSELL$958.1K

Idexx Laboratories INC /deAug 6, 2025

1,525 sh @ $628.27 · -1.4% own

IDXXSSELL$686.5K

Idexx Laboratories INC /deAug 6, 2025

1,095 sh @ $626.90 · -1.0% own

IDXXMEXER$2M

Idexx Laboratories INC /deAug 6, 2025

29,260 sh @ $67.85 · +35.1% own

XRAYAGRANT◆$1.2K

DENTSPLY SIRONA Inc.Jul 11, 2025

75.03 sh @ $16.20

XRAYAGRANT—

DENTSPLY SIRONA Inc.Jul 11, 2025

279.35 sh · +1.0% own

XRAYAGRANT◆$25K

DENTSPLY SIRONA Inc.Jul 1, 2025

1,561.29 sh @ $16.01

XRAYAGRANT—

DENTSPLY SIRONA Inc.May 22, 2025

13,880 sh · +99.6% own

XRAYAGRANT◆$934

DENTSPLY SIRONA Inc.Apr 11, 2025

74.87 sh @ $12.47

XRAYAGRANT—

DENTSPLY SIRONA Inc.Apr 11, 2025

147.73 sh · +1.1% own