Silicon Motion director reports 16,700 ADS stake

Silicon Motion Technology CORP director Duann Shii Tyng filed an initial ownership report on Form 3.

Rhea-AI Filing Summary

Silicon Motion Technology CORP director Duann Shii Tyng filed an initial ownership report on Form 3. The filing shows direct ownership of 16,700 American depositary shares. Each American depositary share represents four ordinary shares of Silicon Motion Technology Corp., as described in the footnote.

Insider Trade Summary

1 transaction reported

Mixed 1 txn

Insider DUANN SHII TYNG

Role Director

Type	Security	Shares	Price	Value
holding	American depositary shares	--	--	--

Holdings After Transaction: American depositary shares — 16,700 shares (Direct)

Footnotes (1)

1. F1. Each American depositary share represents four ordinary shares, US$0.01 par value per share, of Silicon Motion Technology Corp.

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

What does the Silicon Motion (SIMO) Form 3 filing by Duann Shii Tyng show?

The Form 3 shows initial ownership of Silicon Motion shares. Director Duann Shii Tyng reports holding 16,700 American depositary shares, establishing the baseline equity position as a company insider for future Form 4 or Form 5 transaction reporting.

How many Silicon Motion (SIMO) American depositary shares does Duann Shii Tyng hold?

Duann Shii Tyng holds 16,700 American depositary shares. This position is reported as directly owned in the Form 3 filing and represents the insider’s disclosed stake in Silicon Motion at the time of the initial ownership report.

What is the share ratio for Silicon Motion (SIMO) American depositary shares?

Each Silicon Motion American depositary share represents four ordinary shares. The footnote explains that every ADS corresponds to four ordinary shares with a par value of US$0.01 per share of Silicon Motion Technology Corp.

Does the Silicon Motion (SIMO) Form 3 indicate recent insider buying or selling?

The Form 3 does not show specific buy or sell transactions. It functions as an initial statement of beneficial ownership, disclosing Duann Shii Tyng’s direct holding of 16,700 American depositary shares without detailing recent trade activity.

What insider role does Duann Shii Tyng have at Silicon Motion (SIMO)?

Duann Shii Tyng is identified as a director of Silicon Motion. The Form 3 flags the reporting person as a board member, requiring disclosure of equity holdings in the company through this initial beneficial ownership statement.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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Accepted by SEC EDGAR 03/27/2026 - 03:50 PM EDT Learn about SEC filing dates

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

OMB APPROVAL

OMB Number:			3235-0104
Estimated average burden
hours per response:			0.5

1. Name and Address of Reporting Person^*

DUANN SHII TYNG

(Last) (First) (Middle)

C/O SILICON MOTION TECHNOLOGY CORP.

FLAT C, 19/F, WING CHEONG COMMERCIAL BLD

(Street)

HONG KONG ISLAND 00000

(City) (State) (Zip)

TAIWAN, PROVINCE OF CHINA

(Country)

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

3. Issuer Name and Ticker or Trading Symbol
Silicon Motion Technology CORP [ SIMO ]

3a. Foreign Trading Symbol

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

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

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

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)
American depositary shares(1)	16,700	D

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

Explanation of Responses:

1. Each American depositary share represents four ordinary shares, US$0.01 par value per share, of Silicon Motion Technology Corp.

	/s/ Shii Tyng Duann	03/27/2026
	** 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)