Littelfuse (LFUS) director sells shares after option exercises

Rhea-AI Filing Summary

Littelfuse director Kristina A. Cerniglia reported option exercises and a share sale. On February 24, 2026, she exercised stock options covering 911 and 1,432 shares of common stock that were granted in 2019 and 2020 and had vested in annual installments.

The exercises converted into 2,343 common shares, and on the same day she sold 2,343 shares of Littelfuse common stock at $368.38 per share in an open-market transaction. The sale was made under a pre-arranged Rule 10b5-1 trading plan adopted on November 18, 2025, and she held 4,255 shares directly after these transactions.

Insider Trade Summary

Exercise and Sale: 2,343 shares ($492K approx. pre-tax spread)

Exercise and Sale 5 txns

Insider Cerniglia Kristina A.

Role Director

Sold 2,343 shs ($863K)

Approx. gross sale proceeds $863K

Approx. exercise cost $371K

Approx. pre-tax spread $492K

Type	Security	Shares	Price	Value
Exercise	Stock Option (right to buy)	911	$0.00	$0.00
Exercise	Stock Option (right to buy)	1,432	$0.00	$0.00
Exercise	Common Stock	911	$199.24	$182K
Exercise	Common Stock	1,432	$132.08	$189K
Sale	Common Stock	2,343	$368.38	$863K

Holdings After Transaction: Stock Option (right to buy) — 0 shares (Direct); Common Stock — 4,255 shares (Direct)

Footnotes (3)

1. F1. This transaction was effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on November 18, 2025.
2. F2. The option for 911 shares vested in increments of one third annually beginning on the first anniversary of the April 26, 2019 date of grant.
3. F3. The option for 1,432 shares vested in increments of one third annually beginning on the first anniversary of the April 23, 2020 date of grant.

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Form 4 Insider Transactions: What Each Field Means →

Accepted by SEC EDGAR 02/25/2026 - 04:47 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).

X

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^*

Cerniglia Kristina A.

(Last) (First) (Middle)

6133 NORTH RIVER ROAD, SUITE 500

(Street)

ROSEMONT IL 60018

(City) (State) (Zip)

2. Issuer Name and Ticker or Trading Symbol
LITTELFUSE INC /DE [ LFUS ]

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

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

3. Date of Earliest Transaction (Month/Day/Year)
02/24/2026

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

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

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

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	02/24/2026		M		911	A	$199.24	5,166	D
Common Stock	02/24/2026		M		1,432	A	$132.08	6,598	D
Common Stock	02/24/2026		S		2,343(1)	D	$368.38	4,255	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 Option (right to buy)	$199.24	02/24/2026		M			911	(2)	04/26/2026	Common Stock	911	$0	0	D
Stock Option (right to buy)	$132.08	02/24/2026		M			1,432	(3)	04/23/2027	Common Stock	1,432	$0	0	D

Explanation of Responses:

1. This transaction was effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on November 18, 2025.

2. The option for 911 shares vested in increments of one third annually beginning on the first anniversary of the April 26, 2019 date of grant.

3. The option for 1,432 shares vested in increments of one third annually beginning on the first anniversary of the April 23, 2020 date of grant.

Remarks:

	/s/Ryan K. Stafford, Power of Attorney	02/25/2026
	** 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.