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  4. [Form 4] CHARLES RIVER LABORATORIES INTERNATIONAL, INC. Insider Trading Activity

Charles River (NYSE: CRL) CEO awarded shares, withholds stock to pay tax

Filing Impact
(Very High)
Filing Sentiment
(Neutral)
Form Type
4

Rhea-AI Filing Summary

Charles River Laboratories International Chief Executive Officer Birgit Girshick reported equity compensation and related tax withholding transactions. On May 29, 2026, she received a grant of 9,961 shares of common stock at $180.71 per share. On May 30–31, 2026, a total of 1,582 shares were disposed of as tax-withholding transactions at the same price. After these transactions, she directly owned 39,399 shares and indirectly held 40,417 shares through a revocable trust. A footnote states that unvested restricted stock units vest annually on May 29, 2027, 2028, 2029, and 2030.

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Insider Girshick Birgit
Role Chief Executive Officer
Type Security Shares Price Value
Tax Withholding Common Stock 378 $180.71 $68K
Tax Withholding Common Stock 1,204 $180.71 $218K
Grant/Award Common Stock 9,961 $180.71 $1.80M
holding Common Stock -- -- --
Holdings After Transaction: Common Stock — 39,399 shares (Direct, null); Common Stock — 40,417 shares (Indirect, Revocable Trust)
Footnotes (1)
  1. [object Object]
Stock grant 9,961 shares at $180.71 Common stock award on May 29, 2026
Tax-withheld shares 1,582 shares at $180.71 Tax-withholding dispositions on May 30–31, 2026
Direct holdings after 39,399 shares Direct common stock owned after transactions
Indirect holdings after 40,417 shares Indirect common stock via revocable trust
Tax-withholding count 2 transactions Code F dispositions for tax liability
RSU vesting dates May 29, 2027–2030 Annual vesting of unvested restricted stock units
tax-withholding disposition financial
"transaction_action": "tax-withholding disposition""
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.
restricted stock units financial
"Unvested restricted stock units annually ratably vest on: May 29, 2027"
Restricted stock units are a type of company reward where employees are promised shares of stock, but they only fully own these shares after meeting certain conditions, like staying with the company for a set time. They matter because they can become valuable assets and are often used to motivate employees to help the company succeed.
Revocable Trust financial
""nature_of_ownership": "Revocable Trust""
A revocable trust is a legal arrangement where the person who creates it keeps control and can change or cancel the trust at any time, while naming who will manage and receive the assets later. Think of it like a flexible folder for your investments and property that can be relabeled or reworked as circumstances change; it matters to investors because it determines how ownership is recorded, how easily assets transfer on incapacity or death, and whether holdings bypass public probate proceedings.
grant, award, or other acquisition financial
"transaction_code_description": "Grant, award, or other acquisition""
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Form 4 Insider Transactions: What Each Field Means →
SEC Form 4
FORM 4UNITED 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*
Girshick Birgit
(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)
Director10% Owner
XOfficer (give title below)Other (specify below)
Chief Executive Officer
2a. Foreign Trading Symbol
3. Date of Earliest Transaction (Month/Day/Year)
05/29/2026		6. Individual or Joint/Group Filing (Check Applicable Line)
XForm 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)
CodeVAmount(A) or (D)Price
Common Stock05/29/2026A9,961(1)A$180.7140,981D
Common Stock05/30/2026F1,204D$180.7139,777D
Common Stock05/31/2026F378D$180.7139,399D
Common Stock40,417IRevocable Trust
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)
CodeV(A)(D)Date ExercisableExpiration DateTitleAmount or Number of Shares
Explanation of Responses:
1. Unvested restricted stock units annually ratably vest on: May 29, 2027; May 29, 2028; May 29, 2029; May 29, 2030.
/s/ Birgit Girshick06/02/2026
** Signature of Reporting PersonDate
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)

Source: View Original Filing on SEC EDGAR

FAQ

What did CRL CEO Birgit Girshick report in this Form 4 filing?

Birgit Girshick reported an equity award and related tax withholding transactions. She received 9,961 shares of Charles River Laboratories common stock and had 1,582 shares withheld to satisfy tax obligations tied to this compensation event.

How many CRL shares did the CEO receive as a grant in this Form 4?

The CEO received a grant of 9,961 shares of Charles River Laboratories common stock at a reference price of $180.71 per share. This represents compensation, not an open‑market stock purchase transaction by the executive.

Why were some of Birgit Girshick’s CRL shares disposed of in this filing?

Shares were disposed of solely for tax-withholding purposes. Across May 30–31, 2026, a total of 1,582 Charles River Laboratories shares were withheld to cover tax liabilities associated with the equity award, rather than being sold in the open market.

How many CRL shares does the CEO hold after these transactions?

Following the reported transactions, Birgit Girshick directly owned 39,399 shares of Charles River Laboratories common stock. She also indirectly held 40,417 additional shares through a revocable trust, as disclosed in the indirect ownership entry.

What does the Form 4 say about future vesting of CRL restricted stock units?

The filing notes that unvested restricted stock units will vest annually in equal installments. Vesting dates are May 29, 2027, May 29, 2028, May 29, 2029, and May 29, 2030, providing a multi‑year schedule for these awards to become fully vested.

Does this CRL Form 4 reflect any open-market stock sales by the CEO?

No open-market stock sales are indicated. The only dispositions are coded as tax-withholding transactions, meaning shares were delivered to satisfy tax obligations rather than being sold through market trades for investment purposes.