Hsing Michael 4
4 · MONOLITHIC POWER SYSTEMS INC · Filed May 20, 2026
Research Summary
AI-generated summary of this filing
Monolithic Power Systems (MPWR) CEO Michael Hsing Sells 40,000 Shares
What Happened
Michael Hsing, CEO and a director of Monolithic Power Systems (MPWR), sold a total of 40,000 shares in a series of open-market transactions on May 18, 2026. The individual trades ranged in price roughly from $1,460 to $1,521 per share, generating aggregate proceeds of approximately $59.31 million. These were sales (code S) — not purchases or option exercises.
Key Details
- Transaction date: May 18, 2026; Form 4 filed May 20, 2026 (filed within the normal two-business-day window).
- Total shares sold: 40,000; Total proceeds: ~$59,310,170.
- Price range across the trades: approximately $1,459.96 to $1,521.56 per share (footnotes give weighted-average price ranges for the individual reported lines).
- Shares owned after transaction: not specified in the provided lines; footnote F1 notes the ending balance includes 29 shares acquired Feb 17, 2026 via the company ESPP.
- Notes/footnotes: Multiple footnotes (F2–F14) indicate the reported line prices are weighted averages and that the filer can provide the exact number of shares sold at each separate price upon request.
Context
- These were open-market sales (routine dispositions) rather than purchases or option exercises; such sales frequently reflect liquidity or diversification decisions rather than direct commentary on company fundamentals.
- No indication in the filing of gifts, exercises, or tax-withholding shares; all reported items are sales (S).
- Filing appears timely (not marked late).
Insider Transaction Report
Form 4
Hsing Michael
DirectorCEO
Transactions
- Sale
Common Stock
[F2][F1]2026-05-18$1462.61/sh−3,424$5,007,977→ 884,839 total - Sale
Common Stock
[F3]2026-05-18$1467.62/sh−5,819$8,540,081→ 879,020 total - Sale
Common Stock
[F4]2026-05-18$1472.84/sh−5,049$7,436,369→ 873,971 total - Sale
Common Stock
[F5]2026-05-18$1476.96/sh−4,082$6,028,951→ 869,889 total - Sale
Common Stock
[F6]2026-05-18$1482.51/sh−5,737$8,505,160→ 864,152 total - Sale
Common Stock
[F7]2026-05-18$1486.76/sh−6,688$9,943,451→ 857,464 total - Sale
Common Stock
[F8]2026-05-18$1491.48/sh−862$1,285,656→ 856,602 total - Sale
Common Stock
[F9]2026-05-18$1499.46/sh−608$911,672→ 855,994 total - Sale
Common Stock
[F10]2026-05-18$1503.05/sh−2,929$4,402,433→ 853,065 total - Sale
Common Stock
[F11]2026-05-18$1507.70/sh−3,769$5,682,521→ 849,296 total - Sale
Common Stock
[F12]2026-05-18$1513.11/sh−551$833,724→ 848,745 total - Sale
Common Stock
[F13]2026-05-18$1518.15/sh−352$534,389→ 848,393 total - Sale
Common Stock
[F14]2026-05-18$1521.43/sh−130$197,786→ 848,263 total
Holdings
- 133,040(indirect: By Trust)
Common Stock
- 12,825(indirect: By Trust)
Common Stock
Footnotes (14)
- [F1]Ending balance includes 29 shares acquired on February 17, 2026 through the Company's qualified ESPP program.
- [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 $1,500.75 to $1,505.70. 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 $1,505.70 to $1,510.67. 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.
- [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 $1,510.68 to $1,515.44. 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 $1,516.26 to $1,519.25. 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.
- [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 $1,521.33 to $1,521.56. 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.
- [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 $1,459.96 to $1,464.86. 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.
- [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 $1,464.97 to $1,469.94. 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.
- [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 $1,469.95 to $1,474.94. 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.
- [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 $1,474.95 to $1,479.85. 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.
- [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 $1,479.99 to $1,484.93. 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.
- [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 $1,484.95 to $1,489.73. 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.
- [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 $1,490.17 to $1,494.10. 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 $,1495.74 to $1,500.72. 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.
Signature
/s/ Saria Tseng, attorney-in-fact for Mr. Michael R. Hsing|2026-05-20