FOSTER JAMES C (Chairman, President and CEO) sold 51.5% of their position (33.56K shares) of CHARLES RIVER LABORATORIES INTERNATIONAL, INC. on the open market

Open‑market sale worth $10.07M — a major position exit. Review remaining holdings and any 10b5‑1 plan disclosures.

S · 1 sale

FOSTER JAMES C

Filed: 8/27/2026ACC: 0001100682-26-000140

InsiderFOSTER JAMES CCIK 1141722

→

IssuerCHARLES RIVER LABORATORIES INTERNATIONAL, INC.CIK 1100682

DirectorOfficer· Chairman, President and CEO

Since Mar 2026

-33.56K

Net shares

Net seller

$10.07M

Total sold

Open market trades

0B · 1S

Total transactions

33.56K acquired · 67.12K disposed

Non-Derivative Transactions3

Common Stock

Direct

M · Option Exercise

+21.13K

Price / share

$194.12

Trade value

$4.10M

% of position

66.9%

8/25/2026

31.60K→52.73K

Common Stock

Direct

M · Option Exercise

+12.43K

Price / share

$208.44

Trade value

$2.59M

% of position

23.6%

8/25/2026

52.73K→65.16K

Common Stock

Direct

S · Sale

−33.56K

Price / share

$300.00

Trade value

$10.07M

% of position

51.5%

8/25/2026

65.16K→31.60K

Total

Net shares

+0.00

Net value

-$3.38M

Security	Date	Type	Shares	Price / Share	Trade Value	% of Position	Held Before	Held After
Common Stock Direct	8/25/2026	M · Option Exercise	+21.13K	$194.12	$4.10M	66.9%	31.60K	52.73K
Common Stock Direct	8/25/2026	M · Option Exercise	+12.43K	$208.44	$2.59M	23.6%	52.73K	65.16K
Common Stock Direct	8/25/2026	S · Sale	−33.56K	$300.00	$10.07M	51.5%	65.16K	31.60K
Total			+0.00		-$3.38M

Derivative Transactions2

Stock Options (Right to Buy)

Direct

M · Option Exercise

Converts to

Common Stock

21.13K shares

−21.13K

Strike price

194.12

Held after

7.04K

Exercisable

—

8/25/2026

Stock Options (Right to Buy)

Direct

M · Option Exercise

Converts to

Common Stock

12.43K shares

−12.43K

Strike price

208.44

Held after

12.43K

Exercisable

—

8/25/2026

Security	Converts To	Date	Type	Shares	Strike Price	Exercisable	Held After
Stock Options (Right to Buy) Direct	Common Stock21.13K shares	8/25/2026	M · Option Exercise	−21.13K	194.12	—	7.04K
Stock Options (Right to Buy) Direct	Common Stock12.43K shares	8/25/2026	M · Option Exercise	−12.43K	208.44	—	12.43K

Non-Derivative Holdings (Post-Transaction)5

Common Stock

Indirect

Shares owned10K

Common Stock

Indirect

Shares owned5.42K

Common Stock

Indirect

Shares owned10.78K

Common Stock

Indirect

Shares owned155.61K

Common Stock

Indirect

Shares owned20K

Total

201.81K indirect201.81K

Security Title	Shares Owned	Ownership Type
Common Stock	10K	Indirect
Common Stock	5.42K	Indirect
Common Stock	10.78K	Indirect
Common Stock	155.61K	Indirect
Common Stock	20K	Indirect
Total	201.81K	201.81K indirect

Derivative Holdings (Post-Transaction)0

No derivative holdings reported