CRL executive reports tax-withholding share dispositions

CHARLES RIVER LABORATORIES INTERNATIONAL, INC. senior vice president of finance and chief accounting officer Michael Gunnar Knell reported two small tax-related share dispositions.

Rhea-AI Filing Summary

CHARLES RIVER LABORATORIES INTERNATIONAL, INC. senior vice president of finance and chief accounting officer Michael Gunnar Knell reported two small tax-related share dispositions. On May 26, 2026, 50 shares of common stock were delivered at $160.30 per share, and on May 27, 2026, 37 shares were delivered at $156.73 per share. Both transactions are classified as tax-withholding dispositions to pay an exercise price or tax liability, rather than open-market sales. Following these transactions, Knell directly holds 14,515 shares of common stock.

Insider Trade Summary

Exercise Price or Tax Liability: 87 shares

Exercise Price or Tax Liability 2 txns

Insider Knell Michael Gunnar

Role SVP, Finance and CAO

Type	Security	Shares	Price	Value
Exercise Price or Tax Liability	Common Stock	37	$156.73	$6K
Exercise Price or Tax Liability	Common Stock	50	$160.30	$8K

Holdings After Transaction: Common Stock — 14,515 shares (Direct)

Key Figures

Tax-withholding shares (total): 87 shares First tax-withholding trade size: 50 shares First disposition price: $160.30 per share +3 more

6 metrics

Tax-withholding shares (total) 87 shares Total F-code tax-withholding dispositions reported

First tax-withholding trade size 50 shares Common stock on May 26, 2026

First disposition price $160.30 per share Tax-withholding disposition on May 26, 2026

Second tax-withholding trade size 37 shares Common stock on May 27, 2026

Second disposition price $156.73 per share Tax-withholding disposition on May 27, 2026

Shares held after transactions 14,515 shares Direct common stock ownership after May 27, 2026

Key Terms

tax-withholding disposition, Common Stock, Payment of exercise price or tax liability by delivering securities, Form 4

4 terms

tax-withholding disposition financial

"Both transactions are classified as tax-withholding dispositions to pay an exercise price or tax liability"

A tax-withholding disposition is an event or transaction—such as selling or transferring securities, exercising options, or receiving compensation—that triggers a requirement to hold back part of the payment and remit it to tax authorities. It matters to investors because it reduces the cash they receive immediately and can change the timing and amount of taxable income, like a cashier taking a portion of your sale proceeds to pay taxes before you get the rest.

Common Stock financial

"50 shares of common stock were delivered at $160.30 per share"

Common stock represents ownership shares in a company, giving investors a stake in its success and a say in important decisions through voting rights. It is the most common type of stock traded on markets and can provide income through dividends, as well as potential for value growth. For investors, holding common stock means sharing in the company’s profits and risks.

Payment of exercise price or tax liability by delivering securities financial

"transaction_code_description: Payment of exercise price or tax liability by delivering securities"

Form 4 regulatory

"This post-transaction holding figure is disclosed in the Form 4 for each transaction line"

Form 4 is a official document that company insiders, such as executives or major shareholders, file with regulators whenever they buy or sell company shares. It provides transparency about how those with inside knowledge are trading, helping investors see if insiders are confident in the company's prospects or may be selling for personal reasons. This information can influence investor decisions by revealing insiders' perspectives on the company's value.

FAQ

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

What insider activity did CRL executive Michael Gunnar Knell report on this Form 4?

Michael Gunnar Knell reported two tax-withholding dispositions of Charles River common stock. He delivered 50 shares on May 26, 2026 and 37 shares on May 27, 2026 to cover an exercise price or tax liability, rather than executing open-market sales.

How many CRL shares were disposed of for tax withholding by the SVP, Finance and CAO?

A total of 87 Charles River common shares were disposed of for tax purposes. The transactions consisted of 50 shares at $160.30 per share and 37 shares at $156.73 per share, both classified as payment of an exercise price or tax liability by delivering securities.

At what prices were the CRL tax-withholding share dispositions executed?

The tax-withholding dispositions occurred at two different prices. On May 26, 2026, 50 shares were delivered at $160.30 per share. On May 27, 2026, 37 shares were delivered at $156.73 per share, both involving Charles River common stock.

How many CRL shares does Michael Gunnar Knell hold after these Form 4 transactions?

After the reported tax-withholding dispositions, Michael Gunnar Knell directly holds 14,515 shares of Charles River common stock. This post-transaction holding figure is disclosed in the Form 4 for each transaction line and reflects his remaining direct ownership position.

Do these CRL Form 4 entries represent open-market sales by the executive?

The entries do not represent open-market sales. Both transactions are coded as “F” and described as payment of an exercise price or tax liability by delivering securities, indicating tax-withholding dispositions rather than discretionary market sales of Charles River common stock.

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

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Accepted by SEC EDGAR 05/28/2026 - 04:27 PM EDT 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^*

Knell Michael Gunnar

(Last) (First) (Middle)

C/O CHARLES RIVER LABORATORIES

251 BALLARDVALE STREET

(Street)

WILMINGTON MASSACHUSETTS 01887

(City) (State) (Zip)

UNITED STATES

(Country)

2. Issuer Name and Ticker or Trading Symbol
CHARLES RIVER LABORATORIES INTERNATIONAL, INC. [ CRL ]

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

	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	SVP, Finance and CAO

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
05/26/2026

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	05/26/2026		F		50	D	$160.3	14,552	D
Common Stock	05/27/2026		F		37	D	$156.73	14,515	D

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

Explanation of Responses:

	/s/ Michael G. Knell	05/27/2026
	** 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)