Monolithic Power Systems stock slips as investors digest restatement overhang and insider-selling disclosures

Monolithic Power Systems (MPWR) is down 3.4% today. Here is some analysis on what might have caused this price movement.

Analysis: The day’s pullback appears tied to investor caution around the company’s recent financial restatement/non-reliance disclosures and a string of insider-selling filings that can pressure sentiment after a strong run. There does not appear to be one single, definitive company announcement today, so the move may reflect profit-taking while the market continues to price in these governance/accounting headlines.

Details:

A February 26, 2026 Form 8-K disclosed an audit committee determination that certain previously issued financial statements should no longer be relied upon, initiating a restatement process.

An April 30, 2026 SEC filing (ARS) reiterated the non-reliance language and indicated certain previously issued reports and communications tied to the affected periods should not be relied upon.

Recent insider-trading filings showed additional executive sales activity in late May 2026, which can weigh on near-term demand for shares even when sales are planned or small in dollar terms.

This could also be a broader semiconductor/AI-related volatility day, with MPWR moving in sympathy with peers given its elevated valuation and sensitivity to risk appetite.

Sources:

U.S. Securities and Exchange Commission (SEC), Monolithic Power Systems Investor Relations, Investing.com, MarketBeat

Disclaimer: This price movement analysis was generated with the help of AI. Please double-check the information provided for mistakes.

$MPWR Insider Trading Activity

$MPWR insiders have traded $MPWR stock on the open market 127 times in the past 6 months. Of those trades, 0 have been purchases and 127 have been sales.

Here’s a breakdown of recent trading of $MPWR stock by insiders over the last 6 months:

MICHAEL HSING (CEO) has made 0 purchases and 45 sales selling 194,923 shares for an estimated $240,375,896.
SARIA TSENG (EVP & General Counsel) has made 0 purchases and 34 sales selling 79,113 shares for an estimated $95,730,670.
MAURICE SCIAMMAS (EVP, WW Sales & Marketing) has made 0 purchases and 15 sales selling 35,575 shares for an estimated $46,525,087.
THEODORE BLEGEN (EVP and CFO) has made 0 purchases and 18 sales selling 24,725 shares for an estimated $28,832,797.
DEMING XIAO (EVP, Global Operations) sold 22,875 shares for an estimated $26,790,369
JEFF ZHOU has made 0 purchases and 4 sales selling 2,000 shares for an estimated $3,250,762.
VICTOR K LEE has made 0 purchases and 8 sales selling 2,000 shares for an estimated $1,995,099.
ROBERT W II DEAN (Interim CFO) has made 0 purchases and 2 sales selling 26 shares for an estimated $42,543.

To track insider transactions, check out Quiver Quantitative's insider trading dashboard. You can access data on insider stock transactions through the Quiver Quantitative API insider transaction endpoint.

$MPWR Hedge Fund Activity

We have seen 557 institutional investors add shares of $MPWR stock to their portfolio, and 559 decrease their positions in their most recent quarter.

Here are some of the largest recent moves:

CORIENT PRIVATE WEALTH LLC removed 2,031,489 shares (-99.2%) from their portfolio in Q1 2026, for an estimated $2,221,128,498
PRICE T ROWE ASSOCIATES INC /MD/ removed 428,440 shares (-25.3%) from their portfolio in Q1 2026, for an estimated $468,434,873
FMR LLC added 423,823 shares (+10.7%) to their portfolio in Q1 2026, for an estimated $463,386,877
JPMORGAN CHASE & CO removed 350,955 shares (-40.7%) from their portfolio in Q4 2025, for an estimated $318,091,573
ROYAL BANK OF CANADA added 296,788 shares (+168.1%) to their portfolio in Q1 2026, for an estimated $324,493,159
INVESCO LTD. added 295,556 shares (+25.9%) to their portfolio in Q4 2025, for an estimated $267,880,136
T. ROWE PRICE INVESTMENT MANAGEMENT, INC. removed 274,380 shares (-36.6%) from their portfolio in Q4 2025, for an estimated $248,687,056

To track hedge funds' stock portfolios, check out Quiver Quantitative's institutional holdings dashboard. You can access data on hedge funds moves and 13F filings through the Quiver Quantitative API 13F endpoint.

$MPWR Congressional Stock Trading

Members of Congress have traded $MPWR stock 3 times in the past 6 months. Of those trades, 3 have been purchases and 0 have been sales.

Here’s a breakdown of recent trading of $MPWR stock by members of Congress over the last 6 months:

SENATOR MARKWAYNE MULLIN has traded it 3 times. They made 3 purchases worth up to $150,000 on 02/04, 01/05 and 0 sales.

To track congressional stock trading, check out Quiver Quantitative's congressional trading dashboard. You can access data on congressional stock trades through the Quiver Quantitative API Congress trades endpoint.

$MPWR Analyst Ratings

Wall Street analysts have issued reports on $MPWR in the last several months. We have seen 3 firms issue buy ratings on the stock, and 0 firms issue sell ratings.

Here are some recent analyst ratings:

Needham issued a "Buy" rating on 05/01/2026
Stifel issued a "Buy" rating on 02/04/2026
Wells Fargo issued a "Overweight" rating on 01/15/2026

To track analyst ratings and price targets for $MPWR, check out Quiver Quantitative's $MPWR forecast page.

$MPWR Price Targets

Multiple analysts have issued price targets for $MPWR recently. We have seen 8 analysts offer price targets for $MPWR in the last 6 months, with a median target of $1662.5.

Here are some recent targets:

N. Quinn Bolton from Needham set a target price of $1750.0 on 05/01/2026
Kevin Cassidy from Rosenblatt set a target price of $1575.0 on 05/01/2026
John Vinh from Keybanc set a target price of $2000.0 on 05/01/2026
Joe Quatrochi from Wells Fargo set a target price of $1860.0 on 05/01/2026
Joshua Buchalter from TD Cowen set a target price of $1850.0 on 05/01/2026
Tore Svanberg from Stifel set a target price of $1500.0 on 04/16/2026
Kelsey Chia from Citigroup set a target price of $1350.0 on 02/09/2026

This article is not financial advice. See Quiver Quantitative's disclaimers for more information. Note that there may be inaccuracies due to mistakes in ticker-mapping, and other anomalies.