Charles River (CRL) finance chief sells 6,645 shares after exercising 2,345 options

Rhea-AI Filing Summary

Charles River Laboratories International, Inc. senior vice president of finance and chief accounting officer Michael Gunnar Knell reported option exercises and share sales on 2026-08-06. He exercised stock options covering 2,345 shares of common stock at strike prices of $179.66, $194.12, and $208.44 per share and reported open-market sales totaling 6,645 shares of common stock at prices between $258.53 and $265.17 per share, executed in multiple trades at weighted average prices for several tranches.

Insider Trade Summary

Exercise and sale activity reported; no spread calculated

Exercise and Sale 15 txns

Insider Knell Michael Gunnar

Role SVP, Finance and CAO

Sold 6,645 shs ($1.73M)

Approx. gross sale proceeds $1.73M

Approx. exercise cost $460K

Type	Security	Shares	Price	Value
Exercise	Stock Options (Right to Buy)	404	$0.00	$0.00
Exercise	Stock Options (Right to Buy)	1,205	$0.00	$0.00
Exercise	Stock Options (Right to Buy)	736	$0.00	$0.00
Sale	Common Stock F1	1,274	$259.07	$330K
Sale	Common Stock F2	901	$260.63	$235K
Sale	Common Stock F3	810	$261.45	$212K
Sale	Common Stock F4	213	$262.37	$56K
Sale	Common Stock F5	620	$263.94	$164K
Sale	Common Stock F6	482	$265.17	$128K
Exercise	Common Stock	404	$179.66	$73K
Exercise	Common Stock	1,205	$194.12	$234K
Exercise	Common Stock	736	$208.44	$153K
Sale	Common Stock	404	$258.53	$104K
Sale	Common Stock	1,205	$258.53	$312K
Sale	Common Stock	736	$258.53	$190K

Holdings After Transaction: Stock Options (Right to Buy) — 1,138 shares (Direct); Common Stock — 11,852 shares (Direct)

Footnotes (6)

1. F1. This transaction was executed in multiple trades at prices ranging from $258.77 to $259.43. The price reported above reflects the weighted average sale price. The reporting person hereby undertakes to provide upon request to the SEC staff, the issuer or a security holder of the issuer full information regarding the number of shares and prices at which the transaction was effected.
2. F2. This transaction was executed in multiple trades at prices ranging from $259.97 to $260.94. The price reported above reflects the weighted average sale price. The reporting person hereby undertakes to provide upon request to the SEC staff, the issuer or a security holder of the issuer full information regarding the number of shares and prices at which the transaction was effected.
3. F3. This transaction was executed in multiple trades at prices ranging from $261.00 to $261.84. The price reported above reflects the weighted average sale price. The reporting person hereby undertakes to provide upon request to the SEC staff, the issuer or a security holder of the issuer full information regarding the number of shares and prices at which the transaction was effected.
4. F4. This transaction was executed in multiple trades at prices ranging from $262.26 to $262.50. The price reported above reflects the weighted average sale price. The reporting person hereby undertakes to provide upon request to the SEC staff, the issuer or a security holder of the issuer full information regarding the number of shares and prices at which the transaction was effected.
5. F5. This transaction was executed in multiple trades at prices ranging from $263.39 to $264.29. The price reported above reflects the weighted average sale price. The reporting person hereby undertakes to provide upon request to the SEC staff, the issuer or a security holder of the issuer full information regarding the number of shares and prices at which the transaction was effected.
6. F6. This transaction was executed in multiple trades at prices ranging from $264.91 to $265.60. The price reported above reflects the weighted average sale price. The reporting person hereby undertakes to provide upon request to the SEC staff, the issuer or a security holder of the issuer full information regarding the number of shares and prices at which the transaction was effected.

Key Figures

Shares sold: 6,645 shares Options exercised: 2,345 shares Sale price example: $259.07 per share +4 more

7 metrics

Shares sold 6,645 shares Total CRL common shares sold across all sale transactions on 2026-08-06

Options exercised 2,345 shares Total underlying common shares from option exercises (code M) on 2026-08-06

Sale price example $259.07 per share One reported weighted average sale price for 1,274 CRL shares (footnote F1)

Lowest option strike $179.66 per share Exercise price for 404 stock options (right to buy) originally exercisable from 2021-05-29

Highest option strike $208.44 per share Exercise price for 736 stock options (right to buy) originally exercisable from 2025-05-31

Sale price range $258.53–$265.17 per share Approximate range of reported sale prices across all common stock sale tranches

Transaction date 2026-08-06 Date of all reported option exercises and related common stock sales

Key Terms

Stock Options (Right to Buy), exercise or conversion of derivative security, weighted average sale price, multiple trades

4 terms

Stock Options (Right to Buy) financial

"The security title is listed as Stock Options (Right to Buy)."

exercise or conversion of derivative security financial

"The transaction code description states exercise or conversion of derivative security."

weighted average sale price financial

"The price reported above reflects the weighted average sale price."

multiple trades financial

"This transaction was executed in multiple trades at prices ranging from..."

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Form 4 Insider Transactions: What Each Field Means →

Available on EDGAR 08/10/2026 - 04:40 PM Accepted by SEC EDGAR 08/10/2026 - 04:40 PM Learn about SEC filing dates

FAQ

What did CRL executive Michael Gunnar Knell report in this Form 4?

Michael Gunnar Knell reported option exercises for 2,345 shares and open-market sales of 6,645 common shares of Charles River Laboratories International, Inc. on 2026-08-06, at various strike and sale prices detailed in the filing.

How many Charles River (CRL) shares did the insider sell and at what prices?

The insider reported selling 6,645 shares of CRL common stock. The sales occurred in multiple trades at prices ranging from $258.53 to $265.17 per share, with several tranches reported using weighted average sale prices.

How many stock options did the Charles River (CRL) executive exercise?

The executive exercised stock options covering 2,345 shares of CRL common stock. These options carried exercise prices of $179.66, $194.12, and $208.44 per share and had original expiration dates in 2030 and 2034.

Were the Charles River (CRL) insider sales made in multiple trades?

Yes. Several sale tranches were executed in multiple trades within specified price ranges. The reported per-share prices for those tranches are weighted average sale prices, with detailed trade information available upon request as noted in the footnotes.

What role does Michael Gunnar Knell hold at Charles River (CRL)?

Michael Gunnar Knell is identified as SVP, Finance and Chief Accounting Officer of Charles River Laboratories International, Inc. This Form 4 reflects his transactions in the company’s stock and options on 2026-08-06.

Does the Form 4 indicate remaining CRL holdings for the insider?

The reported transactions include exercises and sales, but this Form 4 data does not specify a post-transaction share balance for Michael Gunnar Knell. Only the transaction share amounts and prices are detailed here.

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)
08/06/2026

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	08/06/2026		S		1,274	D	$259.07(1)	14,878	D
Common Stock	08/06/2026		S		901	D	$260.63(2)	13,977	D
Common Stock	08/06/2026		S		810	D	$261.45(3)	13,167	D
Common Stock	08/06/2026		S		213	D	$262.37(4)	12,954	D
Common Stock	08/06/2026		S		620	D	$263.94(5)	12,334	D
Common Stock	08/06/2026		S		482	D	$265.17(6)	11,852	D
Common Stock	08/06/2026		M		404	A	$179.66	12,256	D
Common Stock	08/06/2026		M		1,205	A	$194.12	13,461	D
Common Stock	08/06/2026		M		736	A	$208.44	14,197	D
Common Stock	08/06/2026		S		404	D	$258.53	13,793	D
Common Stock	08/06/2026		S		1,205	D	$258.53	12,588	D
Common Stock	08/06/2026		S		736	D	$258.53	11,852	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
Stock Options (Right to Buy)	$179.66	08/06/2026		M			404	05/29/2021	05/29/2030	Common Stock	404	$0	0	D
Stock Options (Right to Buy)	$194.12	08/06/2026		M			1,205	05/26/2024	05/26/2033	Common Stock	1,205	$0	402	D
Stock Options (Right to Buy)	$208.44	08/06/2026		M			736	05/31/2025	05/31/2034	Common Stock	736	$0	736	D

Explanation of Responses:

1. This transaction was executed in multiple trades at prices ranging from $258.77 to $259.43. The price reported above reflects the weighted average sale price. The reporting person hereby undertakes to provide upon request to the SEC staff, the issuer or a security holder of the issuer full information regarding the number of shares and prices at which the transaction was effected.

2. This transaction was executed in multiple trades at prices ranging from $259.97 to $260.94. The price reported above reflects the weighted average sale price. The reporting person hereby undertakes to provide upon request to the SEC staff, the issuer or a security holder of the issuer full information regarding the number of shares and prices at which the transaction was effected.

3. This transaction was executed in multiple trades at prices ranging from $261.00 to $261.84. The price reported above reflects the weighted average sale price. The reporting person hereby undertakes to provide upon request to the SEC staff, the issuer or a security holder of the issuer full information regarding the number of shares and prices at which the transaction was effected.

4. This transaction was executed in multiple trades at prices ranging from $262.26 to $262.50. The price reported above reflects the weighted average sale price. The reporting person hereby undertakes to provide upon request to the SEC staff, the issuer or a security holder of the issuer full information regarding the number of shares and prices at which the transaction was effected.

5. This transaction was executed in multiple trades at prices ranging from $263.39 to $264.29. The price reported above reflects the weighted average sale price. The reporting person hereby undertakes to provide upon request to the SEC staff, the issuer or a security holder of the issuer full information regarding the number of shares and prices at which the transaction was effected.

6. This transaction was executed in multiple trades at prices ranging from $264.91 to $265.60. The price reported above reflects the weighted average sale price. The reporting person hereby undertakes to provide upon request to the SEC staff, the issuer or a security holder of the issuer full information regarding the number of shares and prices at which the transaction was effected.

	/s/ Michael G. Knell	08/10/2026
	** 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)