Director at Silicon Motion (SIMO) sells 1,500 ADS in open market

Rhea-AI Filing Summary

Silicon Motion Technology CORP director DUANN SHII TYNG sold shares in the company. On this Form 4, the director reported an open-market sale of 1,500 American depositary shares at a price of $245.00 per share. After the transaction, the director directly holds 15,200 American depositary shares.

Each American depositary share represents four ordinary shares of Silicon Motion Technology Corp., so this filing reflects a relatively small, disclosed reduction in the director’s indirect exposure to the company’s ordinary shares while maintaining a meaningful remaining position.

Insights

Equity governance analyst

Director’s 1,500‑ADS sale appears routine relative to remaining stake.

The filing shows director DUANN SHII TYNG executed an open-market sale of 1,500 American depositary shares at $245.00 per ADS. Following the sale, the director continues to hold 15,200 ADS directly, indicating the transaction represents only a portion of the visible position.

The transaction is coded as an open-market sale, with no derivative exercises or tax-withholding events and no remaining derivatives listed. In isolation, this looks like a modest portfolio adjustment rather than a transformational governance or ownership shift, so its impact on the broader investment thesis is limited.

Insider Trade Summary

Net Seller: 1,500 shares

Net Sell 1 txn

Insider DUANN SHII TYNG

Role Director

Sold 1,500 shs ($368K)

Type	Security	Shares	Price	Value
Sale	American depositary shares	1,500	$245.00	$368K

Holdings After Transaction: American depositary shares — 15,200 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

Shares sold: 1,500 American depositary shares Sale price per ADS: $245.00 per American depositary share Shares held after sale: 15,200 American depositary shares +1 more

4 metrics

Shares sold 1,500 American depositary shares Open-market sale on transaction date

Sale price per ADS $245.00 per American depositary share Reported transaction price

Shares held after sale 15,200 American depositary shares Direct ownership following transaction

ADS to ordinary share ratio 1 ADS = 4 ordinary shares Footnote description of American depositary shares

Key Terms

American depositary shares, open-market sale, Form 4, non-derivative

4 terms

American depositary shares financial

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

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.

open-market sale financial

"transaction_action": "open-market sale""

An open-market sale is when a shareholder sells existing shares directly on a public exchange to any willing buyer, rather than through a private deal. Think of it like putting goods on a busy market stall where price is set by supply and demand; for investors it matters because such sales increase available supply, can put short-term downward pressure on the stock price, and signal changes in liquidity or investor confidence.

Form 4 regulatory

"INSIDER FILING DATA (Form 4):"

Form 4 is a official document that company insiders, such as executives or major shareholders, file with regulators whenever they buy or sell company shares. It provides transparency about how those with inside knowledge are trading, helping investors see if insiders are confident in the company's prospects or may be selling for personal reasons. This information can influence investor decisions by revealing insiders' perspectives on the company's value.

non-derivative financial

""transaction_type": "non-derivative""

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

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Accepted by SEC EDGAR 05/07/2026 - 04:15 PM Learn about SEC filing dates

FAQ

What insider transaction did Silicon Motion (SIMO) report on this Form 4?

Silicon Motion reported an open-market sale by a director. Director DUANN SHII TYNG sold 1,500 American depositary shares of Silicon Motion Technology CORP at $245.00 per share, as disclosed in a Form 4 insider trading report filed with regulators.

How many Silicon Motion (SIMO) shares did the director sell and at what price?

The director sold 1,500 American depositary shares at $245.00 each. The Form 4 lists a single non-derivative transaction: an open-market sale of 1,500 ADS of Silicon Motion Technology CORP, with a reported transaction price per share of $245.00.

What are the director’s holdings in Silicon Motion (SIMO) after this transaction?

After the sale, the director holds 15,200 American depositary shares. The Form 4 shows that following the 1,500‑ADS open-market sale, DUANN SHII TYNG directly owns 15,200 American depositary shares of Silicon Motion Technology CORP.

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

Each Silicon Motion ADS represents four ordinary shares. According to the footnote in the Form 4, one American depositary share of Silicon Motion Technology Corp. corresponds to four ordinary shares with a par value of US$0.01 per share.

Was the Silicon Motion (SIMO) Form 4 transaction a buy or a sell?

The Form 4 reports a sale of shares. The transaction is coded as an open-market sale of non-derivative American depositary shares, with the direction classified as “sell” and no offsetting purchase or option exercise activity in this filing.

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).

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^*

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)

HONG KONG

(Country)

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

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

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

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
05/06/2026

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

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

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

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
American depositary shares(1)	05/06/2026		S		1,500	D	$245(1)	15,200	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

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	05/06/2026
	** 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.
* Form 4: SEC 1474 (03-26)