Filings Radar

SEC 8-K and 6-K filings classified by Claude with reasoning, plus Form 4 insider transactions. Ingested from EDGAR’s filing stream in near-real time, reconciled overnight.

MONOLITHIC POWER SYSTEMS INC (MPWR)

CIK 0001280452 4 material events

Insider activity (SEC Form 4)

Open-market buys and sells only — the deliberate trades. Zero here doesn’t mean no filings: grants, option exercises and tax withholding (below) are compensation, not market trades.

Open-market · last 30 days: 0 buyers bought $0 2 sellers sold $114K
Open-market · last 90 days: 0 buyers bought $0 3 sellers sold $20.7M
InsiderRoleDateTransactionSharesValue
Tseng Saria EVP & General Counsel 2026-08-31 Gift 2000 $0
Tseng Saria EVP & General Counsel 2026-08-31 Gift 2000 $0
CHANG KUO WEI HERBERT Director 2026-08-24 Open-market sell 50 $64K
DEAN ROBERT W II Interim CFO 2026-08-24 Open-market sell 32 $42K
DEAN ROBERT W II Interim CFO 2026-08-24 J 5 $0
DEAN ROBERT W II Interim CFO 2026-08-17 Open-market sell 6 $8K
CHANG KUO WEI HERBERT Director 2026-08-11 Open-market sell 50 $71K
DEAN ROBERT W II Interim CFO 2026-08-05 Open-market sell 105 $141K
Sciammas Maurice EVP, WW Sales & Marketing 2026-08-04 Gift 25000 $0
Sciammas Maurice EVP, WW Sales & Marketing 2026-08-04 Gift 25000 $0
Sciammas Maurice EVP, WW Sales & Marketing 2026-08-03 Open-market sell 10b5-1 30 $40K
DEAN ROBERT W II Interim CFO 2026-07-25 Grant/award 1359 $0
Sciammas Maurice EVP, WW Sales & Marketing 2026-07-15 Open-market sell 10b5-1 527 $692K
Sciammas Maurice EVP, WW Sales & Marketing 2026-07-15 Open-market sell 10b5-1 274 $361K
Sciammas Maurice EVP, WW Sales & Marketing 2026-07-15 Open-market sell 10b5-1 409 $541K
Sciammas Maurice EVP, WW Sales & Marketing 2026-07-15 Open-market sell 10b5-1 464 $617K
Sciammas Maurice EVP, WW Sales & Marketing 2026-07-15 Open-market sell 10b5-1 776 $1.0M
Sciammas Maurice EVP, WW Sales & Marketing 2026-07-15 Open-market sell 10b5-1 1460 $2.0M
Sciammas Maurice EVP, WW Sales & Marketing 2026-07-15 Open-market sell 10b5-1 1864 $2.5M
Sciammas Maurice EVP, WW Sales & Marketing 2026-07-15 Open-market sell 10b5-1 1506 $2.0M
Most recent 20 reported transactions. Open-market buys (P) and sells (S) are the deliberate ones; grants and option exercises are compensation. Not investment advice.

Risk Radar (year-over-year Risk Factors)

← All Risk Radar

Fiscal period ending 2025-12-31 versus 2024-12-31view filing on EDGAR →

An unresolved material weakness in deferred income tax accounting — now explicitly rendering controls ineffective — combined with a multi-period financial restatement and active SEC investigation risk marks a sharp governance and compliance deterioration. Regulatory exposure compounds across three fronts: global minimum tax uncertainty (deferred tax benefit down $200M), expanded China investment-law risk against a 92%+ Asia revenue base, and a materially heavier AI/cybersecurity compliance burden. Supply chain and customer-concentration risks also escalated, leaving no major risk theme flat or improving.

5 company-specific · 3 common-mode

Company-specific changes

Revised

Material weakness in deferred income tax accounting persists unresolved into 2025. Prior year was remediated; now explicitly uneffective. Adds SEC investigation/sanctions risk.

We face risks in connection with our internal control over financial reporting and the identified material weakness. Effective internal control over financial reporting is necessary for us to provide…

New

Financial restatement spanning multiple periods creates material new risks: investor confidence erosion, litigation exposure, regulatory inquiries, and reputational harm. Concrete accounting error disclosed.

The restatement of our 2024 annual financial statements and our 2025 quarterly financial statements may affect investor confidence and raise reputational issues and may subject us to additional risks…

Revised

Added specific concession types (prepayments, take-or-pay, tool funding) and working capital impact, escalating supplier negotiation risk and operational constraints.

Risks Associated with Supply and Manufacturing Our ability to increase product sales and revenue may be constrained by the manufacturing capacity of our suppliers. Although we provide our suppliers…

Revised

Top three customer concentration declined from 61% to 54%, but new disclosure of distributor credit, inventory, and covenant risks amplifies volatility exposure materially.

The loss of any significant distributors, value-added resellers or direct or indirect customers, or failure to collect accounts receivable from them could adversely affect our financial position and…

Revised

New G7 Statement exclusion for U.S. multinationals from global minimum tax creates material uncertainty; deferred tax benefit reduced from $1.3B to $1.1B; expanded transfer pricing and permanent establishment risks disclosed.

Risks Associated with Financial Reporting Our worldwide tax rates, financial position and operating results may be affected by changes in the relevant tax laws, interpretation of such tax laws or the…

Also disclosed — common-mode (Semiconductor supply chain constraints, Export controls china restrictions, AI regulatory compliance)
Semiconductor supply chain constraints Revised

Added capacity shortage risks and new risks from diversification (higher costs, regional risks, lost volume discounts). Escalates supply chain vulnerability.

A significant portion of our manufacturing, testing, assembly and packaging capacity comes from suppliers in China, which exposes us to political, cultural, regulatory, economic, foreign exchange…

Export controls china restrictions Revised

New disclosure of U.S. investment law risks in China; Asia revenue concentration increased from 94% to 92% (modest easing). Net effect: escalated regulatory exposure.

Risks Associated with Our Significant Operations in Asia, Particularly in China We derive most of our revenue from direct or indirect sales to customers in Asia and have significant operations in…

AI regulatory compliance Revised

Expanded third-party cloud service exposure, enhanced AI regulatory detail (EU AI Act, state/federal laws, Executive Orders), and more explicit IP/data protection risks from unauthorized AI tool use materially escalate cybersecurity and compliance burden.

Cybersecurity risks, data protection or privacy breaches, cyberattacks, systems integration issues and unauthorized use of AI tools could disrupt our internal operations and/or harm our reputation…

Material year-over-year changes to this company's Risk Factors (Item 1A), found by comparing each annual report to the prior year, judged for materiality, and classified as company-specific or common-mode against the cross-company catalog. Common-mode changes are the macro themes many companies disclose in common; they are collapsed above. A filing marked unchanged had no material change from the prior year; its summary describes the company's standing risks, which remain in force. Fiscal periods are the reporting period ends. Not investment advice.

Dividend Distribution

8-K filed 2026-09-10 confidence 98% Item 8.01

The filing discloses the declaration of a third quarter cash dividend of $2.00 per share to stockholders of record as of September 30, 2026, payable on October 15, 2026. This is a routine but material dividend distribution that affects shareholder value and is a standard capital allocation decision that investors monitor.

View raw filing on EDGAR →

Earnings release

8-K filed 2026-07-30 confidence 99% Item 2.02

This is a clear earnings release for Q2 2026 (quarter ended June 30, 2026) issued on July 30, 2026. The filing discloses comprehensive financial results including revenue of $980.6M (up 47.6% YoY), GAAP net income of $257.3M, diluted EPS of $5.22, and detailed segment performance across all end markets. The press release is attached as Exhibit 99.1 and constitutes the primary disclosure under Item 2.02.

View raw filing on EDGAR →

Shareholder vote

8-K filed 2026-06-12 confidence 98% Item 5.07

Shareholders voted at the June 11, 2026 annual meeting on three matters: election of two Class I directors (Victor K. Lee and Jeff Zhou), ratification of Ernst & Young LLP as independent auditor, and advisory approval of 2025 named executive officer compensation. Detailed voting tallies including for, against, withheld, abstentions, and broker non-votes were disclosed.

View raw filing on EDGAR →

Other material

8-K filed 2026-06-12 confidence 75% Item 8.01

The company announced a quarterly cash dividend of $2.00 per share, representing a material capital allocation decision affecting shareholder returns.

View raw filing on EDGAR →