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

Signature
/s/ Saria Tseng
Issuer symbol
MPWR
Transactions as of
26 Nov 2025
Net transactions value
-$18,529,316
Form type
4
Filing time
28 Nov 2025, 10:19:51 UTC
Previous filing
28 Nov 2025
Next filing
30 Dec 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 26 Nov 2025 0001312593

Transactions Table

Type Sym Class Transaction Value $ Shares Change % * Price $ Shares After Date Ownership Footnotes
transaction MPWR Common Stock Sale $221,467 -240 -0.13% $922.78 187,091 26 Nov 2025 Direct F1
transaction MPWR Common Stock Sale $1,108,248 -1,200 -0.64% $923.54 185,891 26 Nov 2025 Direct F2
transaction MPWR Common Stock Sale $1,226,573 -1,327 -0.71% $924.32 184,564 26 Nov 2025 Direct F3
transaction MPWR Common Stock Sale $1,042,169 -1,126 -0.61% $925.55 183,438 26 Nov 2025 Direct F4
transaction MPWR Common Stock Sale $9,593,567 -10,360 -5.6% $926.02 173,078 26 Nov 2025 Direct F5
transaction MPWR Common Stock Sale $1,711,071 -1,845 -1.1% $927.41 171,233 26 Nov 2025 Direct F6
transaction MPWR Common Stock Sale $913,742 -984 -0.57% $928.60 170,249 26 Nov 2025 Direct F7
transaction MPWR Common Stock Sale $2,079,751 -2,238 -1.3% $929.29 168,011 26 Nov 2025 Direct F8
transaction MPWR Common Stock Sale $632,726 -680 -0.4% $930.48 167,331 26 Nov 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.