IDEXX director gains 257 shares via RSU vesting

IDEXX Laboratories director M. Anne Szostak increased her equity exposure through a routine equity award vesting.

Rhea-AI Filing Summary

IDEXX Laboratories director M. Anne Szostak increased her equity exposure through a routine equity award vesting. On May 7, 2026, restricted stock units covering 257 shares of common stock converted into 257 directly held shares at an exercise price of $0.00 per share, bringing her direct common stock holdings to 519 shares. She also reports indirect ownership of 1,542 shares held by the Trust of M. Anne Szostak and 259 shares held by The O'Hanian-Szostak Family Foundation, reflecting additional positions managed through these entities.

Insider Trade Summary

257 shares exercised/converted

Exercise 4 txns

Insider SZOSTAK M ANNE

Role Director

Type	Security	Shares	Price	Value
Exercise	Restricted Stock Unit	257	$0.00	$0.00
Exercise	Common Stock	257	$0.00	$0.00
holding	Common Stock	--	--	--
holding	Common Stock	--	--	--

Holdings After Transaction: Restricted Stock Unit — 0 contracts (Direct); Common Stock — 519 shares (Direct); Common Stock — 1,542 shares (Indirect, Trust of M. Anne Szostak); Common Stock — 259 shares (Indirect, The O'Hanian-Szostak Family Foundation)

Footnotes (4)

1. F1. The reporting person is the settlor of the Trust of M. Anne Szostak ("Trust") and the trustee of the Trust, has power to direct the distribution of Trust assets, and has the power to revoke or amend the Trust. The reporting person has a pecuniary interest in the shares held by the Trust.
2. F2. The reporting person is a trustee of The O'Hanian-Szostak Family Foundation ('Foundation') and has power to direct the distribution of assets held by the Foundation.
3. F3. Each restricted stock unit represents a contingent right to receive one share of Issuer common stock that vested in one installment on May 7, 2026.
4. F4. Not applicable.

Key Figures

RSUs converted: 257 shares Direct holdings after transaction: 519 shares Trust holdings: 1,542 shares +3 more

6 metrics

RSUs converted 257 shares Restricted stock units converting into common stock on May 7, 2026

Direct holdings after transaction 519 shares Common stock held directly by M. Anne Szostak after RSU conversion

Trust holdings 1,542 shares Common stock held by the Trust of M. Anne Szostak as indirect ownership

Foundation holdings 259 shares Common stock held by The O'Hanian-Szostak Family Foundation as indirect ownership

Exercise price per RSU $0.00 per share Conversion of restricted stock units into common stock

Transaction date May 7, 2026 Date of RSU conversion and updated holdings reporting

Key Terms

Restricted Stock Unit, derivative security, pecuniary interest, indirect ownership

4 terms

Restricted Stock Unit financial

"Each restricted stock unit represents a contingent right to receive one share of Issuer common stock"

A restricted stock unit is a promise from a company to give an employee shares of stock after certain conditions are met, like staying with the company for a set amount of time. It’s like earning a bonus that turns into company stock once you’ve proven your commitment, making it a way to motivate and reward employees.

derivative security financial

"transaction_code_description": "Exercise or conversion of derivative security""

A derivative security is a financial contract whose value comes from the price or performance of something else, such as a stock, bond, commodity, or market index. For investors it acts like an insurance policy or a wager: it can be used to protect against losses, lock in prices, or amplify gains and losses, so it can change a portfolio’s risk and potential return without owning the underlying asset directly.

pecuniary interest financial

"The reporting person has a pecuniary interest in the shares held by the Trust."

indirect ownership financial

""ownership_type": "indirect", "ownership_code": "I""

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

What insider transaction did IDXX director M. Anne Szostak report?

M. Anne Szostak reported a routine equity award vesting. On May 7, 2026, restricted stock units covering 257 shares of IDEXX Laboratories common stock converted into 257 directly held shares, increasing her direct ownership to 519 shares with no reported open‑market sale.

How many IDEXX (IDXX) shares does M. Anne Szostak now hold directly?

She directly holds 519 shares of IDEXX common stock. After 257 restricted stock units converted into common shares at a zero exercise price, her directly owned position increased to 519 shares as reported in the Form 4 filing.

What indirect IDEXX (IDXX) holdings does M. Anne Szostak report?

She reports indirect ownership through a trust and a foundation. The Form 4 lists 1,542 shares held by the Trust of M. Anne Szostak and 259 shares held by The O'Hanian-Szostak Family Foundation, in addition to her directly owned shares.

What does the restricted stock unit transaction mean for IDXX ownership?

The transaction reflects conversion of compensation into common shares. Each restricted stock unit represented a right to receive one IDEXX common share, vesting in a single installment on May 7, 2026, and increasing M. Anne Szostak’s directly held share count without any disclosed sale.

Were any IDEXX (IDXX) shares sold in this Form 4 transaction?

No share sales are reported in this Form 4. The filing shows an exercise of restricted stock units into 257 common shares and updated ownership totals, but no open‑market sale or disposition transaction is identified in the reported data.

What entities hold IDEXX (IDXX) shares related to M. Anne Szostak?

Shares are held through a trust and a family foundation. The Trust of M. Anne Szostak holds 1,542 shares, and The O'Hanian-Szostak Family Foundation holds 259 shares, both reported as indirect ownership positions associated with the director.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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Accepted by SEC EDGAR 05/11/2026 - 05:10 PM Learn about SEC filing dates

SEC Form 4

FORM 4

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940

OMB APPROVAL

OMB Number:			3235-0287
Estimated average burden
hours per response:			0.5

Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

1. Name and Address of Reporting Person^*

SZOSTAK M ANNE

(Last) (First) (Middle)

ONE IDEXX DRIVE

(Street)

WESTBROOK MAINE 04092

(City) (State) (Zip)

UNITED STATES

(Country)

2. Issuer Name and Ticker or Trading Symbol
IDEXX LABORATORIES INC /DE [ IDXX ]

5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

X	Director		10% Owner
	Officer (give title below)		Other (specify below)

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
05/07/2026

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

4. If Amendment, Date of Original Filed (Month/Day/Year)

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	3. Transaction Code (Instr. 8)		4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5)			5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4)	6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
			Code	V	Amount	(A) or (D)	Price
Common Stock	05/07/2026		M		257	A	$0	519	D
Common Stock								1,542	I	Trust of M. Anne Szostak(1)
Common Stock								259	I	The O'Hanian-Szostak Family Foundation(2)

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	4. Transaction Code (Instr. 8)		5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5)		6. Date Exercisable and Expiration Date (Month/Day/Year)		7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4)		8. Price of Derivative Security (Instr. 5)	9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)	10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares
Restricted Stock Unit	(3)	05/07/2026		M			257	(3)	(3)	Common Stock	257	(4)	0	D

Explanation of Responses:

1. The reporting person is the settlor of the Trust of M. Anne Szostak ("Trust") and the trustee of the Trust, has power to direct the distribution of Trust assets, and has the power to revoke or amend the Trust. The reporting person has a pecuniary interest in the shares held by the Trust.

2. The reporting person is a trustee of The O'Hanian-Szostak Family Foundation ('Foundation') and has power to direct the distribution of assets held by the Foundation.

3. Each restricted stock unit represents a contingent right to receive one share of Issuer common stock that vested in one installment on May 7, 2026.

4. Not applicable.

Remarks:

	/s/ Lily J. Lu, Attorney-in-Fact for M. Anne Szostak	05/11/2026
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.
* Form 4: SEC 1474 (03-26)