Silicom (NASDAQ: SILC) VP Engineering details RSUs, options in Form 3

Rhea-AI Filing Summary

Silicom Ltd. VP Engineering David Castiel filed an initial ownership report showing indirect equity awards held by a trustee. The filing lists restricted share units covering 2,000 underlying ordinary shares that vest on June 14, 2026, and additional RSUs covering 8,000 ordinary shares vesting in three annual tranches of 2,667, 2,667 and 2,666 shares starting one year after January 29, 2026. It also shows share options over 10,000 ordinary shares at an exercise price of 16.4200 per share expiring on June 18, 2032, and further options over 15,000 ordinary shares at 15.0100 per share expiring on June 18, 2033, all subject to continued service. In addition, the report notes 2,000 ordinary shares held indirectly by a trustee.

SEC Form 3

FORM 3

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

INITIAL STATEMENT OF BENEFICIAL OWNERSHIP OF SECURITIES

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940

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1. Name and Address of Reporting Person^*

Castiel David

(Last) (First) (Middle)

14 ATIR YEDA

(Street)

KFAR SAVA 4464323

(City) (State) (Zip)

ISRAEL

(Country)

2. Date of Event Requiring Statement (Month/Day/Year)
03/18/2026

3. Issuer Name and Ticker or Trading Symbol
SILICOM LTD. [ SILC ]

3a. Foreign Trading Symbol
[SILC]

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

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

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

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 Beneficially Owned
1. Title of Security (Instr. 4)	2. Amount of Securities Beneficially Owned (Instr. 4)	3. Ownership Form: Direct (D) or Indirect (I) (Instr. 5)	4. Nature of Indirect Beneficial Ownership (Instr. 5)
Ordinary Shares	2,000	I	By Trustee

Table II - Derivative Securities Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 4)	2. Date Exercisable and Expiration Date (Month/Day/Year)		3. Title and Amount of Securities Underlying Derivative Security (Instr. 4)		4. Conversion or Exercise Price of Derivative Security	5. Ownership Form: Direct (D) or Indirect (I) (Instr. 5)	6. Nature of Indirect Beneficial Ownership (Instr. 5)
	Date Exercisable	Expiration Date	Title	Amount or Number of Shares
Restricted Share Units	(2)	(2)	Ordinary Shares	2,000	(1)	I	By Trustee
Restricted Share Units	(3)	(3)	Ordinary Shares	8,000	(1)	I	By Trustee
Share Option (right to buy)	(4)	06/18/2032	Ordinary Shares	10,000	$16.42	I	By Trustee
Share Option (right to buy)	(5)	06/18/2033	Ordinary Shares	15,000	$15.01	I	By Trustee

Explanation of Responses:

1. Each restricted share unit (RSU) represents the right to receive, following vesting, one share of the Issuer.

2. The RSUs will vest and convert into ordinary shares, on June 14, 2026, subject to the Reporting Person's continuous service relationship with the Issuer on the vesting date.

3. Subject to the Reporting Person's continuous service relationship with the Issuer through each applicable vesting date, (a) 2,667 of the RSUs will vest and convert into ordinary shares one year after the grant date (which grant date is January 29, 2026), (b) 2,667 of the RSUs will vest and convert into ordinary shares on the second annual anniversary of the grant date and (c) 2,666 of the RSUs will vest and convert into ordinary shares on the three year anniversary of the grant date. If a vesting date falls on a non-business date, the next business date shall apply

4. Each option represents an option to purchase one share of the Issuer's ordinary shares upon vesting. The options were granted on June 18, 2024 (the "Grant Date") and will vest as follows: (a) 50% on the second annual anniversary of the Grant Date; and (b) 50% on the third annual anniversary of the Grant Date, subject to the Reporting Person's continuous service relationship with the Issuer through each applicable vesting date.

5. Each option represents an option to purchase one share of the Issuer's ordinary shares upon vesting. The options were granted on June 18, 2025 (the "Grant Date") and will vest as follows: (a) 50% on the second annual anniversary of the Grant Date; and (b) 50% on the third annual anniversary of the Grant Date subject to the Reporting Person's continuous service relationship with the Issuer through each applicable vesting date.

	/s/ Castiel David	03/18/2026
	** 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 5 (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 3: SEC 1473 (03-26)

FAQ

What does the Silicom (SILC) Form 3 filing for David Castiel show?

The Form 3 shows David Castiel’s initial indirect equity holdings in Silicom. It lists restricted share units, stock options with specific exercise prices and expirations, and ordinary shares held by a trustee, all tied to his role as VP Engineering.

How many Silicom (SILC) shares are covered by David Castiel’s RSUs?

David Castiel’s RSUs cover 10,000 underlying ordinary shares in total. One grant relates to 2,000 shares vesting on June 14, 2026, while another grant covers 8,000 shares vesting in three equal annual installments starting one year after January 29, 2026.

What stock options does David Castiel hold in Silicom (SILC)?

He holds two indirect option grants over Silicom ordinary shares. One covers 10,000 shares at 16.4200 per share expiring on June 18, 2032. Another covers 15,000 shares at 15.0100 per share expiring on June 18, 2033, both subject to continued service.

How do David Castiel’s Silicom (SILC) RSUs vest over time?

His RSUs vest based on continued service with Silicom. One grant vests entirely on June 14, 2026. A second grant of 8,000 underlying shares vests in three annual tranches of 2,667, 2,667 and 2,666 shares starting one year after January 29, 2026.

Are David Castiel’s Silicom (SILC) holdings direct or indirect?

All reported holdings are indirect and held by a trustee. The Form 3 indicates indirect ownership for his RSUs, stock options, and 2,000 ordinary shares, with the nature of ownership explicitly described as “By Trustee” in the filing data.

What role does continued service play in David Castiel’s Silicom (SILC) awards?

Continued service is required for vesting of his equity awards. The RSUs and options vest only if he maintains a continuous service relationship with Silicom through each specified vesting date, as detailed in the footnotes to the filing.