Monolithic Power Systems (MPWR) shares fall after disappointing Q3 guidance
Monolithic Power Systems (MPWR) shares are trading down 5.7% on 28 April 2026, after the company issued Q3 earnings guidance that disappointed investors. The semiconductor firm's stock is currently at $1,497.82, extending losses from yesterday's session.
The negative investor reaction follows a Q4 revenue forecast of $610.0 million (midpoint), which signals a sequential decline. This outlook is attributed to delays in Nvidia's Blackwell chips. The guidance overshadowed Q3 results that surpassed expectations, with revenue reaching $620.1 million, a 30.6% increase, and earnings per share at $4.08, up 31.8%.
Rosenblatt Downgrade on Competition Concerns
Rosenblatt responded to the guidance by downgrading Monolithic Power Systems to neutral. The analyst firm cited concerns over heightened competition from rivals such as Infineon and Renesas, adding pressure to the stock. The company's valuation, which stood at over 90 times trailing earnings prior to the report, amplified the subsequent sell-off.
The current decline deepens losses for Monolithic Power Systems, which fell 4.5% yesterday following geopolitical tensions impacting the broader semiconductor sector. This contrasts with gains earlier in the week, including a 4.2% rise on 23 April after the company reported record 2025 earnings.
Monolithic Power Systems is trading at $1,497.82, down from yesterday's close of $1,587.57.
Why Nvidia's Blackwell Delays Are Weighing on Monolithic Power Systems' Outlook
Monolithic Power Systems, or MPWR, designs and manufactures integrated circuits, which are essentially the tiny, complex brains that power countless electronic devices. Think of them as the specialised component supplier for a vast array of electronics, from consumer gadgets to industrial applications and automotive systems. Their customers are other companies that build these devices, and MPWR makes its money by providing the high-performance, energy-efficient power solutions that enable these products to function.
Today's downward move stems directly from Monolithic Power Systems' Q4 revenue forecast, which projected a midpoint of $610.0 million. This figure signals a sequential decline in revenue and disappointed investors, particularly because it was attributed to delays in Nvidia's Blackwell chips. When a key customer like Nvidia experiences delays in launching a highly anticipated product, it creates a ripple effect down the supply chain, directly impacting component suppliers like MPWR, who were expecting to sell chips for those products. This overshadows what were otherwise strong Q3 results, and was compounded by a downgrade from Rosenblatt citing increased competition.
This specific guidance has seen Monolithic Power Systems' shares trading down by 5.7% today, 28 April 2026, with the stock currently at $1,497.82, a notable drop from yesterday's close of $1,587.57.
Imagine a bespoke furniture maker who relies on a specific, custom-milled type of timber from a single supplier for their next big collection. If that timber supplier announces unexpected delays, the furniture maker's production schedule and, crucially, their expected sales for the upcoming quarter are immediately impacted, even if they've just finished a highly successful previous collection. The market is reacting to the delay of a critical "component" for MPWR's future business, not just its past performance.
Monolithic Power Systems
Monolithic Power Systems, Inc. (MPWR) develops and markets semiconductor-based power electronics solutions across diverse sectors, including computing, automotive, industrial, communications, and consumer markets. The company's offerings encompass direct current (DC) to DC integrated circuits, essential for voltage conversion and control in various electronic systems such as portable devices, wireless LAN access points, computers, and medical equipment. Additionally, it provides lighting control integrated circuits for backlighting applications in LCD panels found in notebooks, monitors, and televisions, as well as for general illumination products. MPWR distributes its products through third-party channels and directly to original equipment manufacturers and other end customers across Asia, Europe, and the United States. The company was established in 1997.