MPWR EVP sells 30 shares under 10b5-1 plan
MONOLITHIC POWER SYSTEMS INC EVP Maurice Sciammas reported a small pre-planned stock sale by a family trust.
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Form Type
4
Rhea-AI Filing Summary
MONOLITHIC POWER SYSTEMS INC EVP Maurice Sciammas reported a small pre-planned stock sale by a family trust. On May 4, 2026, the Clement Sciammas Trust sold 30 shares of MPWR common stock at $1,588.73 per share in an open-market transaction.
After this sale, the Clement Sciammas Trust held 1,209 shares. The filing also shows other indirect holdings in various Sciammas family trusts and GRATs, and 178,644 shares held directly. The sale was executed under a Rule 10b5-1 trading plan adopted on November 19, 2025, indicating it was pre-arranged.
Insider Trade Summary 10b5-1
Net Seller: 30 shares
Net Sell
12 txns
Insider
Sciammas Maurice
Role
EVP, WW Sales & Marketing
Sold
30 shs ($48K)
| Type | Security | Shares | Price | Value |
|---|---|---|---|---|
| Sale | Common Stock | 30 | $1,588.73 | $48K |
| holding | Common Stock | -- | -- | -- |
| holding | Common Stock | -- | -- | -- |
| holding | Common Stock | -- | -- | -- |
| holding | Common Stock | -- | -- | -- |
| holding | Common Stock | -- | -- | -- |
| holding | Common Stock | -- | -- | -- |
| holding | Common Stock | -- | -- | -- |
| holding | Common Stock | -- | -- | -- |
| holding | Common Stock | -- | -- | -- |
| holding | Common Stock | -- | -- | -- |
| holding | Common Stock | -- | -- | -- |
Holdings After Transaction:
Common Stock — 1,209 shares (Indirect, Clement Sciammas Trust);
Common Stock — 178,644 shares (Direct);
Common Stock — 1,299 shares (Indirect, Rosalind Sciammas Brokerage Account);
Common Stock — 1,699 shares (Indirect, The Joseph Roger Sciammas 2020 Irrevocable Trust);
Common Stock — 2,000 shares (Indirect, Rosalind Sciammas Family 2021 Trust);
Common Stock — 49,460 shares (Indirect, Sciammas Family Trust);
Common Stock — 26,660 shares (Indirect, Various Sciammas GRATs);
Common Stock — 1,699 shares (Indirect, The Patrick Francis Sciammas 2020 Irrevocable Trust);
Common Stock — 4,015 shares (Indirect, By Sciammas Trust 2020);
Common Stock — 1,000 shares (Indirect, Peter Rafferty and Eric Toothill 2021Trust);
Common Stock — 1,699 shares (Indirect, The Chloe Liliane Sciammas 2020 Irrevocable Trust);
Common Stock — 5,000 shares (Indirect, Clement Sciammas Family 2021 Trust)
Footnotes (1)
- F1. This transaction was made pursuant to a Rule 10b5-1 trading plan adopted on 11/19/2025.
Key Figures
Shares sold: 30 shares
Sale price: $1,588.73 per share
Trust holdings after sale: 1,209 shares
+4 more
7 metrics
Shares sold
30 shares
Open-market sale by Clement Sciammas Trust on May 4, 2026
Sale price
$1,588.73 per share
Price for the 30 MPWR shares sold on May 4, 2026
Trust holdings after sale
1,209 shares
Clement Sciammas Trust position following the 30-share sale
Direct holdings
178,644 shares
Common stock held directly by Maurice Sciammas as of May 4, 2026
Sciammas Family Trust holdings
49,460 shares
Indirect holdings in Sciammas Family Trust
Various Sciammas GRATs holdings
26,660 shares
Indirect holdings in various Sciammas GRATs
Net share change
30 shares net-sell
transactionSummary netBuySellShares and netBuySellDirection
Key Terms
Rule 10b5-1 trading plan, open-market sale, indirect ownership, Sciammas Family Trust, +1 more
5 terms
Rule 10b5-1 trading plan regulatory
"This transaction was made pursuant to a Rule 10b5-1 trading plan adopted on 11/19/2025."
A Rule 10b5-1 trading plan is a pre-arranged schedule that allows company insiders to buy or sell stock at specific times, even if they have inside information. It helps prevent accusations of unfair trading by making these transactions look planned and transparent, rather than sneaky or illegal.
open-market sale financial
"Transaction code S described as a sale in open market or private transaction."
An open-market sale is when a shareholder sells existing shares directly on a public exchange to any willing buyer, rather than through a private deal. Think of it like putting goods on a busy market stall where price is set by supply and demand; for investors it matters because such sales increase available supply, can put short-term downward pressure on the stock price, and signal changes in liquidity or investor confidence.
indirect ownership financial
"Ownership type is marked as indirect with various Sciammas family trusts and GRATs."
Sciammas Family Trust financial
"Nature of ownership listed as Sciammas Family Trust for 49,460 common shares."
Various Sciammas GRATs financial
"Nature of ownership listed as Various Sciammas GRATs for 26,660 common shares."
FAQ
AI-generated questions and answers. How Rhea-AI works. Not financial advice.
What did MPWR EVP Maurice Sciammas report in this Form 4 filing?
EVP Maurice Sciammas reported that the Clement Sciammas Trust sold 30 shares of Monolithic Power Systems common stock at $1,588.73 per share on May 4, 2026. The sale was an open-market transaction executed under a pre-arranged Rule 10b5-1 plan.
Was the MPWR insider sale by Maurice Sciammas part of a Rule 10b5-1 plan?
Yes. The filing states the transaction was made under a Rule 10b5-1 trading plan adopted on November 19, 2025. Such plans pre-schedule trades, indicating the timing of this 30-share sale was set in advance rather than decided opportunistically.
What other MPWR holdings associated with Maurice Sciammas are shown in the Form 4?
The filing lists several indirect holdings in family trusts and GRATs, including 49,460 shares in the Sciammas Family Trust and 26,660 shares in various Sciammas GRATs. It also reports 178,644 shares of common stock held directly by Maurice Sciammas.
AI-generated analysis. How Rhea-AI works. Not financial advice.
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