Silicon Motion CEO reports 486,214 ADS stake

Silicon Motion Technology Corp director and President and CEO Wallace Chiachang Kou filed an initial ownership report showing his direct holding of 486,214 American depositary shares.

Accepted by SEC EDGAR 04/09/2026 - 04:05 PM EDT Learn about SEC filing dates

Rhea-AI Filing Summary

Silicon Motion Technology Corp director and President and CEO Wallace Chiachang Kou filed an initial ownership report showing his direct holding of 486,214 American depositary shares.

Each American depositary share represents four ordinary shares of Silicon Motion Technology Corp, highlighting a substantial existing equity stake rather than a new transaction.

Insider Trade Summary

Holdings reported, no transactions

Holdings

Insider KOU WALLACE CHIACHANG

Role President and CEO

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

Holdings: American depositary shares — 486,214 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.

Key Figures

ADS holdings: 486,214 American depositary shares ADS to ordinary share ratio: 4 ordinary shares per ADS

2 metrics

ADS holdings 486,214 American depositary shares Directly owned by President and CEO Wallace Chiachang Kou

ADS to ordinary share ratio 4 ordinary shares per ADS Each American depositary share represents four ordinary shares

Key Terms

American depositary shares, ordinary shares, Form 3

3 terms

American depositary shares financial

"Each American depositary share, represents four ordinary shares, US$0.01 par value per share"

American depositary shares (ADSs) are a way for investors in the United States to buy shares of foreign companies without dealing with international markets directly. They represent ownership in a foreign company's stock and are traded on U.S. stock exchanges, making it easier for American investors to buy, sell, and own parts of companies from around the world.

ordinary shares financial

"represents four ordinary shares, US$0.01 par value per share, of Silicon Motion Technology Corp."

Ordinary shares are a type of ownership stake in a company, giving shareholders a right to participate in the company’s profits and decision-making through voting. They are similar to owning a piece of a business, and their value can rise or fall based on the company's performance. Investors buy ordinary shares to potentially earn dividends and benefit from the company's growth over time.

Form 3 regulatory

"INSIDER FILING DATA (Form 3):"

Form 3 is the initial public filing that officers, directors and large shareholders must submit to report their ownership of a company’s securities when they become insiders. It acts like an opening inventory sheet that gives investors a starting point to see who holds significant stakes and to spot later trades or potential conflicts of interest, helping assess insider confidence and transparency.

FAQ

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

What does Wallace Chiachang Kou’s Form 3 filing for SIMO show?

The filing shows Wallace Chiachang Kou, President and CEO of Silicon Motion Technology Corp, directly holds 486,214 American depositary shares. It is an initial ownership report, indicating existing holdings rather than a new purchase or sale.

How many Silicon Motion (SIMO) ADS does the CEO own according to this filing?

According to the filing, Wallace Chiachang Kou directly owns 486,214 American depositary shares of Silicon Motion Technology Corp. This figure reflects his reported equity position at the time of the Form 3, not a new transaction.

What does one Silicon Motion (SIMO) American depositary share represent?

Each American depositary share represents four ordinary shares of Silicon Motion Technology Corp. This ratio means the CEO’s 486,214 ADS correspond economically to a larger number of underlying ordinary shares in the company.

Is the Silicon Motion (SIMO) Form 3 a buy or sell transaction?

The Form 3 is not a buy or sell transaction; it is an initial ownership statement. It simply discloses Wallace Chiachang Kou’s existing holding of 486,214 American depositary shares as a company insider.

What insider role does Wallace Chiachang Kou hold at Silicon Motion (SIMO)?

Wallace Chiachang Kou serves as President and CEO and also as a director of Silicon Motion Technology Corp. His Form 3 filing reports his direct ownership of 486,214 American depositary shares in the company.

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

Understanding Insider Trading Forms →

See more from StockTitan in Google Search and AI answers. Adds StockTitan as a preferred source · opens Google

Add on Google Not now

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^*

KOU WALLACE CHIACHANG

(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

(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
X	Officer (give title below)		Other (specify below)
	President and CEO

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)	486,214	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/ Wallace Chiachang Kou	04/08/2026
	** 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)