Monolithic Power Systems filings document regulatory disclosures for a fabless semiconductor company focused on power electronics solutions. Its 8-K filings furnish quarterly and annual operating results, earnings commentary, cash dividend declarations, officer-transition disclosures, and other material events tied to financial reporting.
The filing record also includes proxy materials covering annual meeting matters, director and executive compensation disclosures, and stockholder voting procedures. Other filings describe governance amendments such as bylaw changes affecting special-meeting rights, and reporting-controls matters including non-reliance determinations and restatement-related disclosures for previously issued financial statements.
Monolithic Power Systems, Inc. (MPWR) CEO and director Michael Hsing reported selling 30,000 common shares on September 28, 2026, across eight sale entries. The sales were made under a Rule 10b5-1 trading plan adopted May 29, 2026. Separate position entries list 133,040 shares held by M Hsing 04 Trust and 12,825 shares held by ZH Family 2020 Trust.
Monolithic Power Systems, Inc. officer and director Michael Hsing reported a proposed sale of 30,000 common shares, with an aggregate market value of $40,349,049.00 and an approximate sale date of September 28, 2026. The shares comprise 29,961 performance shares and 39 Employee Stock Purchase Plan shares; the remarks describe their acquisition periods as spanning 2023 through 2025.
Monolithic Power Systems, Inc. (MPWR) announced a third quarter 2026 cash dividend of $2.00 per common share. The dividend will be paid to stockholders of record as of the close of business on September 30, 2026, with payment scheduled for October 15, 2026. The company describes itself as a fabless global provider of high-performance, semiconductor-based power electronics solutions, focused on energy-efficient, cost-effective products that support a sustainable future and provide a return on investment to stockholders.
For MONOLITHIC POWER SYSTEMS, INC. (MPWR), EVP & General Counsel Saria Tseng reported internal reallocations of common stock on August 31, 2026. 2,000 shares were transferred as a bona fide gift from her direct holdings to the C&T Family Irrevocable Trust, where she is a trustee, with no funds exchanged and no sale occurring. After the transfer she held 142,218 shares directly, 2,000 shares indirectly through the family trust, and 1,000 shares indirectly through the C&T Discovery Foundation.
MONOLITHIC POWER SYSTEMS, INC. (MPWR) reported insider activity by Interim CFO Robert W. Dean II. On 2026-08-24, he sold 32 shares of common stock in open-market transactions at a weighted average price of $1,297.72 per share to cover tax withholding obligations upon the vesting of restricted stock units. The sale prices ranged from $1,296.07 to $1,298.01. On the same date, he also disposed of 5 shares through a transfer from his direct holdings to an individual who is not an immediate family member sharing the same household; no funds were exchanged, no sale occurred, and he no longer retains any pecuniary interest in those shares. After these transactions, an additional 65 shares of common stock are reported as held indirectly, described as "Held by Parent & Daughter."
For MONOLITHIC POWER SYSTEMS, INC. (MPWR), director Chang Kuo Wei Herbert reported selling 50 shares of common stock on 2026-08-24 in a sale in open market or private transaction at $1,281.57 per share. After this transaction, he directly holds 515 shares of MPWR common stock.
MONOLITHIC POWER SYSTEMS, INC. (MPWR) is the issuer for a planned sale of common stock under Rule 144 by Robert Dean. The notice covers 32 shares of common stock to be sold through Morgan Stanley Smith Barney LLC, with an aggregate market value of $41,526.90 based on information as of August 24, 2026.
The securities to be sold are associated with time-based restricted stock units, with the acquisition date listed as August 22, 2026. The filing also lists prior sales of MPWR common stock by Robert Dean during the preceding three months.
MONOLITHIC POWER SYSTEMS, INC. (MPWR) officer Robert W. Dean II, Interim CFO, reported a small sale of 6 shares of common stock on 2026-08-17 at $1,413.64 per share. The footnote states the sale was made to cover tax withholding obligations upon the vesting of restricted stock units. After this transaction, he holds 7,126 shares directly and 65 shares indirectly held by Parent & Daughter.
Monolithic Power Systems (symbol MPWR) insider Robert Dean filed a notice of proposed sale of 6 shares of common stock through Morgan Stanley Smith Barney LLC Executive Financial Services, with a referenced value of 8128.45 and an anticipated sale date of 08/17/2026 on NASDAQ. The filing also notes time-based restricted stock units related to 6 shares, dated 08/15/2026, issued by the company. Over the prior three months, Dean reported additional sales of 105, 22, and 4 shares of common stock on 08/05/2026, 05/26/2026, and 05/18/2026, respectively, with corresponding transaction values of 141148.35, 35882.23, and 6253.12.
Monolithic Power Systems, Inc. director Chang Kuo Wei Herbert reported selling 50 shares of common stock on 2026-08-11. The sale was a non-derivative transaction in the open market or a private transaction at a price of $1,420.00 per share, leaving him with 565 shares held directly.