Michael Hsing - 12 Nov 2025 Form 4 Insider Report for MONOLITHIC POWER SYSTEMS INC (MPWR)

Signature
/s/ Saria Tseng, attorney-in-fact for Mr. Michael R. Hsing
Issuer symbol
MPWR
Transactions as of
12 Nov 2025
Net transactions value
-$35,724,380
Form type
4
Filing time
13 Nov 2025, 16:15:33 UTC
Previous filing
13 Nov 2025
Next filing
11 Dec 2025

Reporting Owners (1)

Name Relationship Address Signature Signature date CIK
Hsing Michael CEO, Director 1555 PALM BEACH LAKES BLVD., WEST PALM BEACH /s/ Saria Tseng, attorney-in-fact for Mr. Michael R. Hsing 12 Nov 2025 0001308676

Transactions Table

Type Sym Class Transaction Value $ Shares Change % * Price $ Shares After Date Ownership Footnotes
transaction MPWR Common Stock Sale $385,905 -403 -0.04% $957.58 955,266 12 Nov 2025 Direct F1
transaction MPWR Common Stock Sale $2,682,394 -2,799 -0.29% $958.34 952,467 12 Nov 2025 Direct F2
transaction MPWR Common Stock Sale $422,118 -440 -0.05% $959.36 952,027 12 Nov 2025 Direct F3
transaction MPWR Common Stock Sale $387,061 -403 -0.04% $960.45 951,624 12 Nov 2025 Direct F4
transaction MPWR Common Stock Sale $1,830,944 -1,904 -0.2% $961.63 949,720 12 Nov 2025 Direct F5
transaction MPWR Common Stock Sale $2,711,672 -2,817 -0.3% $962.61 946,903 12 Nov 2025 Direct F6
transaction MPWR Common Stock Sale $3,422,245 -3,552 -0.38% $963.47 943,351 12 Nov 2025 Direct F7
transaction MPWR Common Stock Sale $3,148,030 -3,264 -0.35% $964.47 940,087 12 Nov 2025 Direct F8
transaction MPWR Common Stock Sale $5,425,144 -5,619 -0.6% $965.50 934,468 12 Nov 2025 Direct F9
transaction MPWR Common Stock Sale $6,341,845 -6,562 -0.7% $966.45 927,906 12 Nov 2025 Direct F10
transaction MPWR Common Stock Sale $2,925,448 -3,024 -0.33% $967.41 924,882 12 Nov 2025 Direct F11
transaction MPWR Common Stock Sale $2,006,463 -2,072 -0.22% $968.37 922,810 12 Nov 2025 Direct F12
transaction MPWR Common Stock Sale $945,380 -975 -0.11% $969.62 921,835 12 Nov 2025 Direct F13
transaction MPWR Common Stock Sale $706,371 -728 -0.08% $970.29 921,107 12 Nov 2025 Direct F14
transaction MPWR Common Stock Sale $57,337 -59 -0.01% $971.81 921,048 12 Nov 2025 Direct F15
transaction MPWR Common Stock Sale $448,452 -461 -0.05% $972.78 920,587 12 Nov 2025 Direct F16
transaction MPWR Common Stock Sale $290,172 -298 -0.03% $973.73 920,289 12 Nov 2025 Direct F17
transaction MPWR Common Stock Sale $620,080 -633 -0.07% $979.59 919,656 12 Nov 2025 Direct F18
transaction MPWR Common Stock Sale $967,319 -987 -0.11% $980.06 918,669 12 Nov 2025 Direct F19
holding MPWR Common Stock 133,040 12 Nov 2025 by M Hsing 04 Trust
holding MPWR Common Stock 12,825 12 Nov 2025 ZH Family 2020 Trust
* 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 $957.18 to $957.95. 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.
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 $958.06 to $958.88. 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 $959.01 to $959.56. 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.
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 $960.00 to $960.74. 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.
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 $961.07 to $961.98. 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.
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 $962.02 to $962.99. 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 $963.00 to $963.99. 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 $964.00 to $964.92. 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 $965.00 to $965.98. 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.
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 $966.00 to $ 966.99. 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 $967.00 to $967.93. 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 $968.01 to $968.94. 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.
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 $969.14 to $969.98. 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.
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 $970.02 to $970.85. 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 $971.74 to $971.96. 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.
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 $972.05 to $972.98. 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.
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 $973.45 to $973.84. 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 $979.59 to $979.60. 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 $980.00 to $980.25. 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.