Saria Tseng - Nov 25, 2025 Form 4 Insider Report for MONOLITHIC POWER SYSTEMS INC (MPWR)

Signature
/s/ Saria Tseng
Stock symbol
MPWR
Transactions as of
Nov 25, 2025
Transactions value $
-$18,083,638
Form type
4
Date filed
11/28/2025, 10:15 AM
Previous filing
Oct 31, 2025
Next filing
Nov 28, 2025

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 2025-11-25 0001312593

Transactions Table

Type Sym Class Transaction Value $ Shares Change % * Price $ Shares After Date Ownership Footnotes
transaction MPWR Common Stock Sale -$344K -385 -0.19% $894.54 207K Nov 25, 2025 Direct F1
transaction MPWR Common Stock Sale -$1.46M -1.63K -0.79% $895.63 205K Nov 25, 2025 Direct F2
transaction MPWR Common Stock Sale -$1.85M -2.07K -1.01% $896.37 203K Nov 25, 2025 Direct F3
transaction MPWR Common Stock Sale -$677K -754 -0.37% $897.54 203K Nov 25, 2025 Direct F4
transaction MPWR Common Stock Sale -$130K -145 -0.07% $898.38 202K Nov 25, 2025 Direct F5
transaction MPWR Common Stock Sale -$288K -320 -0.16% $899.37 202K Nov 25, 2025 Direct F6
transaction MPWR Common Stock Sale -$312K -346 -0.17% $900.41 202K Nov 25, 2025 Direct F7
transaction MPWR Common Stock Sale -$793K -880 -0.44% $901.58 201K Nov 25, 2025 Direct F8
transaction MPWR Common Stock Sale -$108K -120 -0.06% $902.07 201K Nov 25, 2025 Direct F9
transaction MPWR Common Stock Sale -$145K -160 -0.08% $903.54 201K Nov 25, 2025 Direct F10
transaction MPWR Common Stock Sale -$181K -200 -0.1% $904.39 200K Nov 25, 2025 Direct F11
transaction MPWR Common Stock Sale -$145K -160 -0.08% $905.32 200K Nov 25, 2025 Direct F12
transaction MPWR Common Stock Sale -$247K -272 -0.14% $906.33 200K Nov 25, 2025 Direct F13
transaction MPWR Common Stock Sale -$9.25M -10.2K -5.1% $907.21 190K Nov 25, 2025 Direct F14
transaction MPWR Common Stock Sale -$807K -888 -0.47% $908.49 189K Nov 25, 2025 Direct F15
transaction MPWR Common Stock Sale -$506K -556 -0.29% $909.35 188K Nov 25, 2025 Direct F16
transaction MPWR Common Stock Sale -$327K -359 -0.19% $910.42 188K Nov 25, 2025 Direct F17
transaction MPWR Common Stock Sale -$295K -324 -0.17% $911.92 188K Nov 25, 2025 Direct F18
transaction MPWR Common Stock Sale -$219K -240 -0.13% $912.30 187K Nov 25, 2025 Direct F19
* 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 $894.17 to $894.81. 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 $895.14 to $895.89. 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 $896.01 to $896.98. 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.
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 $897.32 to $897.83. 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.
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 $898.05 to $898.56. 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 $899.01 to $899.90. 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 $900.02 to $900.90. 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 $901.22 to $901.94. 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.
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 $902.01 to $902.14. 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.
F10 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 $903.36 to $903.72. 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.
F11 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 $904.12 to $904.81. 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.
F12 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 $905.07 to $905.53. 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.
F13 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 $906.14 to $906.67. 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.
F14 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 $907.20 to $907.73. 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.
F15 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 $908.02 to $908.89. 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.
F16 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 $909.02 to $909.74. 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.
F17 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 $910.01 to $910.96. 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.
F18 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 $911.85 to $911.95. 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.
F19 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 $912.12 to $912.48. 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.