Monolithic Power EVP sells 5,000 shares

Monolithic Power Systems EVP & General Counsel Saria Tseng reported multiple share dispositions.

Rhea-AI Filing Summary

Monolithic Power Systems EVP & General Counsel Saria Tseng reported multiple share dispositions. On May 22, 2026, she completed an open-market sale of 5,000 shares of common stock at $1,586.43 per share, leaving 151,783 shares held directly afterward.

The filing also reports a bona fide gift transfer of 200 shares from her direct holdings to an individual who is not an immediate family member sharing the same household. The footnote states no funds were exchanged, no sale occurred, and she no longer retains any pecuniary interest in those shares.

In addition, the filing shows 1,000 shares of common stock held indirectly through the C&T Discovery Foundation.

Insider Trade Summary

Net Seller: 5,000 shares

Net Sell 3 txns

Insider Tseng Saria

Role EVP & General Counsel

Sold 5,000 shs ($7.93M)

Type	Security	Shares	Price	Value
Gift	Common Stock	200	$0.00	$0.00
Sale	Common Stock	5,000	$1,586.43	$7.93M
holding	Common Stock	--	--	--

Holdings After Transaction: Common Stock — 151,783 shares (Direct); Common Stock — 1,000 shares (Indirect, C&T Discovery Foundation)

Footnotes (1)

1. F1. The reported transaction involved a transfer of securities from the reporting person's direct holdings to an individual who is not an immediate family member sharing the same household. No funds were exchanged and no sale of shares occurred in the transfer. Following the completion of the transfer, the reporting person no longer retains any pecuniary interest in the shares.

Key Figures

Shares sold: 5,000 shares Sale price: $1,586.43 per share Direct holdings after sale: 151,783 shares +2 more

5 metrics

Shares sold 5,000 shares Open-market sale of common stock on May 22, 2026

Sale price $1,586.43 per share Average price for 5,000 shares sold

Direct holdings after sale 151,783 shares Common stock held directly following transactions

Gifted shares 200 shares Bona fide gift transfer with no pecuniary interest retained

Indirect holdings 1,000 shares Common stock held indirectly via C&T Discovery Foundation

Key Terms

open-market sale, bona fide gift, pecuniary interest, indirect ownership, +1 more

5 terms

open-market sale financial

"Sale in open market or private 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.

bona fide gift financial

"transaction_action": "gift transfer" ... "Bona fide gift""

A bona fide gift is a genuine, voluntary transfer of money, property, or benefits from one party to another made without expectation of repayment, services, or hidden conditions. Investors care because such gifts can affect company disclosures, related‑party transaction rules, tax treatment, and perceived conflicts of interest; think of it like someone giving you a present with no strings attached — but on a corporate scale, auditors and regulators need to verify it really is unconditional.

pecuniary interest financial

"the reporting person no longer retains any pecuniary interest in the shares"

indirect ownership financial

""ownership_type": "indirect", "ownership_code": "I""

nature of ownership financial

""nature_of_ownership": "C&T Discovery Foundation""

FAQ

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

What insider transactions did MPWR EVP Saria Tseng report on May 22, 2026?

She reported an open-market sale of 5,000 shares of Monolithic Power common stock at $1,586.43 per share and a bona fide gift transfer of 200 shares, plus an updated indirect holding of 1,000 shares.

At what price did MPWR executive Saria Tseng sell shares in this Form 4?

She sold 5,000 shares of Monolithic Power common stock at an average price of $1,586.43 per share. This was an open-market transaction reported with code S, indicating a sale in the market or a private transaction.

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

After the transactions, she holds 151,783 shares directly and 1,000 shares indirectly through the C&T Discovery Foundation. The gift transfer of 200 shares left her with no pecuniary interest in those particular shares.

What is the nature of the 200-share transfer reported by MPWR’s EVP in this filing?

The 200-share transfer is reported as a bona fide gift. The footnote explains it was to a non-immediate-family individual, no funds were exchanged, no sale occurred, and she no longer has any pecuniary interest in those shares.

How many MPWR shares were gifted by Saria Tseng in this Form 4 filing?

She gifted 200 shares of Monolithic Power common stock. The transfer came from her direct holdings, involved no payment, and is characterized as a bona fide gift, with no remaining pecuniary interest retained in those shares.

What indirect holdings in MPWR stock does Saria Tseng report?

She reports an indirect holding of 1,000 shares of Monolithic Power common stock. These shares are held through the C&T Discovery Foundation, as indicated by the nature-of-ownership description in the Form 4 data.

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

Form 4 Insider Transactions: What Each Field Means →

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Accepted by SEC EDGAR 05/27/2026 - 05:07 PM Learn about SEC filing dates

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^*

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)

	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	EVP & General Counsel

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
05/22/2026

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
Common Stock	05/22/2026		G		200	D	$0(1)	156,783	D
Common Stock	05/22/2026		S		5,000	D	$1,586.43	151,783	D
Common Stock								1,000	I	C&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)
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares

Explanation of Responses:

1. The reported transaction involved a transfer of securities from the reporting person's direct holdings to an individual who is not an immediate family member sharing the same household. No funds were exchanged and no sale of shares occurred in the transfer. Following the completion of the transfer, the reporting person no longer retains any pecuniary interest in the shares.

Remarks:

	/s/ Saria Tseng	05/27/2026
	** 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 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)