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  4. [Form 4] MONOLITHIC POWER SYSTEMS INC Insider Trading Activity

Monolithic Power (NASDAQ: MPWR) EVP sells 7,565 shares at $1,700

Filing Impact
(Very High)
Filing Sentiment
(Very Negative)
Form Type
4

Rhea-AI Filing Summary

Monolithic Power Systems' EVP & General Counsel, Saria Tseng, reported an open-market sale of company stock. On May 27, 2026, she sold 7,565 shares of Common Stock at a price of $1,700 per share, and now holds 144,218 shares directly.

The filing also shows an indirect holding of 1,000 shares attributed to the C&T Discovery Foundation, recorded as a holding entry rather than a new trade.

Positive

  • None.

Negative

  • None.
Insider Tseng Saria
Role EVP & General Counsel
Sold 7,565 shs ($12.86M)
Type Security Shares Price Value
Sale Common Stock 7,565 $1,700.00 $12.86M
holding Common Stock -- -- --
Holdings After Transaction: Common Stock — 144,218 shares (Direct, null); Common Stock — 1,000 shares (Indirect, C&T Discovery Foundation)
Footnotes (1)
Shares sold 7,565 shares Open-market sale of Common Stock on May 27, 2026
Sale price per share $1,700.00 per share Price reported for the 7,565-share sale
Direct holdings after transaction 144,218 shares Total Common Stock directly held following the sale
Indirect holdings 1,000 shares Common Stock held indirectly via C&T Discovery Foundation
Net shares sold 7,565 shares Net-sell direction from transaction summary
open-market sale financial
"transaction_action: "open-market sale" for the 7,565-share Common Stock transaction"
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.
indirect ownership financial
"direct_or_indirect: "I" with nature_of_ownership "C&T Discovery Foundation""
Common Stock financial
"security_title: "Common Stock" for both transactions on May 27, 2026"
Common stock represents ownership shares in a company, giving investors a stake in its success and a say in important decisions through voting rights. It is the most common type of stock traded on markets and can provide income through dividends, as well as potential for value growth. For investors, holding common stock means sharing in the company’s profits and risks.
transaction code S financial
"transaction_code: "S" described as "Sale in open market or private transaction""
Form 4 Insider Transactions: What Each Field Means →
SEC Form 4
FORM 4UNITED 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*
Tseng Saria
(Last)(First)(Middle)
1555 PALM BEACH LAKES BLVD.
(Street)
WEST PALM BEACH FLORIDA 33401
(City)(State)(Zip)
UNITED STATES
(Country)		2. Issuer Name and Ticker or Trading Symbol
MONOLITHIC POWER SYSTEMS INC [ MPWR ] 		5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)
Director10% Owner
XOfficer (give title below)Other (specify below)
EVP & General Counsel
2a. Foreign Trading Symbol
3. Date of Earliest Transaction (Month/Day/Year)
05/27/2026		6. Individual or Joint/Group Filing (Check Applicable Line)
XForm 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)
CodeVAmount(A) or (D)Price
Common Stock05/27/2026S7,565D$1,700144,218D
Common Stock1,000IC&T Discovery Foundation
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)
CodeV(A)(D)Date ExercisableExpiration DateTitleAmount or Number of Shares
Explanation of Responses:
Remarks:
/s/ Saria Tseng05/29/2026
** Signature of Reporting PersonDate
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)

Source: View Original Filing on SEC EDGAR

FAQ

What insider transaction did MPWR executive Saria Tseng report?

Saria Tseng reported an open-market sale of Monolithic Power Systems common stock. She sold 7,565 shares at $1,700 per share on May 27, 2026, according to the Form 4, reflecting a routine disposition of part of her direct holdings.

How many MPWR shares does Saria Tseng hold after the reported sale?

After the sale, Saria Tseng directly holds 144,218 shares of Monolithic Power Systems common stock. The Form 4 also reports an additional 1,000 shares held indirectly through the C&T Discovery Foundation, which are listed as an indirect ownership position.

Was the MPWR insider transaction an open-market sale or another type of trade?

The Form 4 classifies the transaction as an open-market sale of common stock. The transaction code is “S,” described as a sale in open market or private transaction, with 7,565 shares sold at a reported price of $1,700 per share.

Does Saria Tseng have any indirect ownership in MPWR shares?

Yes. The filing lists 1,000 shares of Monolithic Power Systems common stock held indirectly. These shares are attributed to the C&T Discovery Foundation and are recorded as a holding entry, separate from her directly held shares.

What is the net share change from Saria Tseng’s MPWR transactions?

The transaction summary shows a net sell of 7,565 shares of Monolithic Power Systems common stock. There was one sale transaction and one holding entry, resulting in a net-sell direction based on the reported non-derivative activity in the Form 4.