Saria Tseng - Nov 26, 2025 Form 4 Insider Report for MONOLITHIC POWER SYSTEMS INC (MPWR)

Role
EVP & General Counsel
Signature
/s/ Saria Tseng
Stock symbol
MPWR
Transactions as of
Nov 26, 2025
Transactions value $
-$18,529,316
Form type
4
Date filed
11/28/2025, 10:19 AM
Previous filing
Nov 28, 2025
SEC
View on sec.gov

Reporting Owners (1)

Name Relationship Address Signature Signature date CIK
Tseng Saria EVP & General Counsel 1555 PALM BEACH LAKES BLVD., WEST PALM BEACH /s/ Saria Tseng 2025-11-26 0001312593

Transactions Table

Type Sym Class Transaction Value $ Shares Change % * Price $ Shares After Date Ownership Footnotes
transaction MPWR Common Stock Sale -$221K -240 -0.13% $922.78 187K Nov 26, 2025 Direct F1
transaction MPWR Common Stock Sale -$1.11M -1.2K -0.64% $923.54 186K Nov 26, 2025 Direct F2
transaction MPWR Common Stock Sale -$1.23M -1.33K -0.71% $924.32 185K Nov 26, 2025 Direct F3
transaction MPWR Common Stock Sale -$1.04M -1.13K -0.61% $925.55 183K Nov 26, 2025 Direct F4
transaction MPWR Common Stock Sale -$9.59M -10.4K -5.65% $926.02 173K Nov 26, 2025 Direct F5
transaction MPWR Common Stock Sale -$1.71M -1.85K -1.07% $927.41 171K Nov 26, 2025 Direct F6
transaction MPWR Common Stock Sale -$914K -984 -0.57% $928.60 170K Nov 26, 2025 Direct F7
transaction MPWR Common Stock Sale -$2.08M -2.24K -1.31% $929.29 168K Nov 26, 2025 Direct F8
transaction MPWR Common Stock Sale -$633K -680 -0.4% $930.48 167K Nov 26, 2025 Direct F9
* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Explanation of Responses:

Id Content
F1 The price is the weighted average sale price for the transactions reported on this line. The prices for the transactions reported on this line range from $922.42 to $922.94. The reporting person undertakes to provide, upon request by the staff of the Securities and Exchange Commission, the issuer, or a security holder of the issuer, full information regarding the number of shares sold at each separate price.
F2 The price is the weighted average sale price for the transactions reported on this line. The prices for the transactions reported on this line range from $923.11 to $923.98. The reporting person undertakes to provide, upon request by the staff of the Securities and Exchange Commission, the issuer, or a security holder of the issuer, full information regarding the number of shares sold at each separate price.
F3 The price is the weighted average sale price for the transactions reported on this line. The prices for the transactions reported on this line range from $924.00 to $924.83. The reporting person undertakes to provide, upon request by the staff of the Securities and Exchange Commission, the issuer, or a security holder of the issuer, full information regarding the number of shares sold at each separate price.
F4 The price is the weighted average sale price for the transactions reported on this line. The prices for the transactions reported on this line range from $925.18 to $925.82. The reporting person undertakes to provide, upon request by the staff of the Securities and Exchange Commission, the issuer, or a security holder of the issuer, full information regarding the number of shares sold at each separate price.
F5 The price is the weighted average sale price for the transactions reported on this line. The prices for the transactions reported on this line range from $926.00 to $926.63. The reporting person undertakes to provide, upon request by the staff of the Securities and Exchange Commission, the issuer, or a security holder of the issuer, full information regarding the number of shares sold at each separate price.
F6 The price is the weighted average sale price for the transactions reported on this line. The prices for the transactions reported on this line range from $927.01 to $927.86. The reporting person undertakes to provide, upon request by the staff of the Securities and Exchange Commission, the issuer, or a security holder of the issuer, full information regarding the number of shares sold at each separate price.
F7 The price is the weighted average sale price for the transactions reported on this line. The prices for the transactions reported on this line range from $928.40 to $928.98. The reporting person undertakes to provide, upon request by the staff of the Securities and Exchange Commission, the issuer, or a security holder of the issuer, full information regarding the number of shares sold at each separate price.
F8 The price is the weighted average sale price for the transactions reported on this line. The prices for the transactions reported on this line range from $929.00 to $929.72. The reporting person undertakes to provide, upon request by the staff of the Securities and Exchange Commission, the issuer, or a security holder of the issuer, full information regarding the number of shares sold at each separate price.
F9 The price is the weighted average sale price for the transactions reported on this line. The prices for the transactions reported on this line range from $930.01 to $930.98. The reporting person undertakes to provide, upon request by the staff of the Securities and Exchange Commission, the issuer, or a security holder of the issuer, full information regarding the number of shares sold at each separate price.