Analyst Report: MPWR
1. EXECUTIVE SUMMARY
Monolithic Power Systems fell 8.99% to $1,167.93 on Thursday, October 22, on volume of 1,479,300 shares, 2.18x its 50-session average. The best-supported driver is a sector-wide chip selloff that followed a supply warning from Lam Research on its October 21 earnings call (24/7 Wall St). No source ties MPWR's drop to a company-specific event, and no source explains why it fell more than most peers: MU fell 6.26%, NVDA 4.40%, AVGO 4.31% and AMD 8.10%, while MRVL fell 8.70% and the S&P 500 fell 1.21%. Valuation is one candidate, which is my inference and not a sourced cause. Two price-target cuts earlier in the week and a cash-conversion concern raised by Trefis add to the pressure ahead of third-quarter results on October 29.
2. THE CATALYST
Lam Research's chief financial officer, Doug Bettinger, said on the October 21 call that "this revenue guide would have been a bit higher if not for some near-term supply chain constraints that we are actively managing" (24/7 Wall St, October 22). Lam's CEO added that clean-room space and component supply constraints would keep limiting chipmakers' ability to meet end demand into calendar 2027 (24/7 Wall St).
The market reacted on Thursday. According to 24/7 Wall St, the selling hit chip designers exposed to AI data centres hardest, which is where MPWR's power-chip business sits, though the article does not name MPWR. StockStory, syndicated on Yahoo Finance, listed MPWR among stocks that fell in the afternoon session. The research assistant could only read its summary, which gives no MPWR-specific reason. Intel also fell, 8.04% over the period, which 24/7 Wall St takes as evidence that the selling reached chipmakers regardless of business model.
The prior session, October 21, had closed up 2.77% at $1,283.32 in an afternoon AI-hardware rally that Yahoo Finance attributed to strong AI hardware demand and solid corporate earnings (meta description only). Thursday's decline therefore erased that gain and more.
| Date | Close | Change | Volume |
|---|---|---|---|
| Oct 19 | $1,253.66 | +3.53% | 862,100 |
| Oct 20 | $1,248.74 | -0.39% | 509,200 |
| Oct 21 | $1,283.32 | +2.77% | 610,500 |
| Oct 22 | $1,167.93 | -8.99% | 1,479,300 |
3. COMPANY PROFILE
Monolithic Power Systems provides semiconductor-based power electronics. Its direct current to direct current products convert and control voltages in cloud and on-premises servers, AI systems, memory, storage, notebooks, infotainment and network infrastructure. It sells across China, Taiwan, South Korea, Southeast Asia, Europe, the United States and Japan. The market capitalisation is $57.40bn. Semiconductor peers in the site's comparison set include MU, NVDA, AMD, INTC, AVGO and MRVL.
Second-quarter 2026 revenue was about $980.6m, up 47.6% year on year, with diluted EPS of $5.22 (Ad-hoc News, October 21). On the July 30 call, management said enterprise data grew 45% from fiscal Q1 2026, book-to-bill stayed above 1, and channel inventory in enterprise data remained very low (Trefis, October 22). Management had already flagged second-half headwinds on the Q1 call (TIKR, around July 20).
4. DEEP DIVE ANALYSIS
Do fundamentals justify the move? The brief contains no MPWR-specific deterioration on October 22. Lam's warning concerns supply limits on chipmakers, and the read-across to a power-chip designer is indirect. The size of the fall relative to NVDA and AVGO is unexplained by any source. The stock trades at a trailing P/E of 78.1 and a forward P/E of 33.1. Trefis cites about 78x trailing earnings against about 23x for the S&P 500. High-multiple stocks tend to fall further in a broad risk-off session, which is my inference.
Analyst actions. TD Cowen cut its target to $1,700 from $1,850 and kept Buy (MarketBeat, MarketScreener, October 19 to 20). Wells Fargo cut to $1,550 from $1,800 and kept Overweight (Ad-hoc News, October 20; MarketScreener dates it October 19). Both preceded the October 22 session, so they add valuation pressure without explaining a single-day drop. MarketBeat shows a "Moderate Buy" consensus with an average target of about $1,725. Defense World gives about $1,707 and FactSet via MarketScreener about $1,823, so providers differ. Headline-only reports of a Citi Buy reiteration and KeyCorp raising its Q3 EPS estimate to $7.10 are unverified.
Cash conversion. Trefis calculates that free cash flow fell 23% year on year in fiscal Q2 while revenue rose 47.6%. It puts trailing 12-month free cash flow at about 17.8% of revenue, down from 28%, with dividends at 56% of free cash flow. These are Trefis's calculations.
Sector reversal. Micron's June message was that chip supply would stay tight beyond 2027, framed as supporting pricing power (CNBC, June 24). Lam's October warning frames the same constraint as a cap on revenue. The research assistant identified this shift as the sector story to watch.
Comparable episodes. Trefis says MPWR has fallen 30% or more within a calendar year in five of the last ten years, and fell 34% in the 2025 tariff shock against 19% for the S&P 500 ETF. In July, Wells Fargo cut its target to $1,700 from $1,860 about nine days before Q2 results and raised it to $1,800 on July 31 (TIKR; Defense World). That pre-earnings cut followed by a post-results raise is a pattern Q3 will test.
Bull case. Revenue is growing at close to 48%, book-to-bill is above 1, channel inventory is lean, and analyst targets of $1,550 to $1,700 sit well above the $1,167.93 close. A supply cap on the industry also supports demand visibility.
Bear case. Free cash flow is lagging revenue, the multiple is high, targets are being trimmed into earnings, and the sector narrative has shifted from pricing power to supply-limited revenue.
5. TECHNICAL SNAPSHOT
The close of $1,167.93 sits below both the 50-day average of $1,293.12 and the 200-day average of $1,306.02, and 31.65% below the 52-week high of $1,708.95 set on May 26. It remains well above the 52-week low of $827.63. It is also the lowest close in the ten-session table, so no nearby support level shows in the recent closes. The session low of $1,147.17 was the intraday floor. Volume of 1,479,300 was 2.18x the 50-session average, the heaviest in the table, which indicates broad participation in the selling. The stock closed near the lower part of a range that opened at $1,227.18.
6. RISK FACTORS
- Earnings on October 29. Q3 results are due after the close (Ad-hoc News, MarketScreener). The facts panel shows consensus of $7.75 EPS and $1.16bn revenue. Barchart projected $6.53 on October 14, so estimates conflict. Trefis names free cash flow as a share of revenue as the metric to watch.
- Supply constraints. Lam's warning that constraints persist into 2027 could limit customers' output and, by extension, demand for components.
- Further target cuts. Pre-earnings reductions have already come from two brokers.
- Valuation. A trailing P/E of 78.1 leaves the shares sensitive to sector selling.
- Data quality. Some brief items are headline-only or contradictory, including aggregator rating changes and a MarketBeat headline giving the wrong report date.
7. ACTIONABLE OUTLOOK
Short term (1-2 weeks): Direction depends on the October 29 report and on whether the semiconductor group stabilises after Thursday's fall. Volatility is elevated, with daily moves of 3% to 9% in recent sessions. The $1,167.93 close and the $1,147.17 session low are the levels to watch.
Medium term (1-3 months): Free cash flow conversion and management's second-half commentary will carry the most weight. The July precedent, where a pre-earnings target cut was followed by a raise after results, gives a template. Nothing guarantees a repeat.
Long term: The brief contains nothing that changes the growth thesis built on AI and enterprise data demand. The cash-conversion trend and the high multiple remain the main points of debate. This is analysis only and not personal financial advice.