Monolithic Power Systems (MPWR) jumped 7.5% to $1,337.18 on November 3, 2026, taking its five-day gain to 9.6% while the chip sector fell 9.4%. Record third-quarter results and a higher growth floor for enterprise data stand behind the strength, and shares sit above their 50- and 200-day averages. The balance of evidence leans positive with high conviction, though the breakout math falls short of 3 to 1.
Why it matters
The trigger was the third-quarter report on October 29, 2026. Revenue reached a record $1,202.4 million, up 63.1% from a year earlier and the first quarter above $1 billion, according to the Motley Fool transcript. Enterprise data brought in $506.7 million, up 164.6%, and communications $187.4 million, up 134.7%. Non-GAAP earnings per share rose 73.2% to $8.19. The guidance mattered as much as the quarter: management raised its enterprise-data growth floor to 150% year over year and outlined $8 billion of capacity by the second half of 2027, as Seeking Alpha reported.
The stock did not simply rally on that. A month later shares are 7.7% lower, and they sit 9.6% below the October 5, 2026 close of $1,479.89. The sector explains why. SOXX is down 21.4% over the month, and a Yahoo Finance report tied the October 23 drop in MPWR and other chip names to warnings that component bottlenecks and cleanroom space would limit equipment makers through 2027. A strong print ran into a sector-wide selloff rather than a verdict on the company.
The five-day split shows how much of the recent move belongs to the stock. The S&P 500 (SPY) lost 2.1% and SOXX lost 9.4%, while MPWR gained 9.6%, which puts it 19.1 points ahead of its sector. Today's 7.5% jump has no company headline behind it. SOXX rose 2.4% today, which accounts for only part of it. The only item dated today is a PR Newswire notice that a law firm is investigating possible breaches of fiduciary duty by directors and officers. That is an investigation, not a finding, and it would not explain a rise. The nearest catalyst is analyst commentary from the day before.
The positive argument is that the selloff was indiscriminate. Morningstar reports that William Blair's Sebastien Naji named MPWR among the stocks that fell further than fundamentals justify. Khaveen Investments, in a Seeking Alpha upgrade, now assumes 36.4% average revenue growth over five years, up from 24%, mostly on enterprise data. The cautious argument comes from the sector rather than the company. Nothing in the coverage suggests MPWR's demand is cracking. But the October 23 warnings say supply constraints, not demand, may cap the industry through 2027, and the legal notices add noise.
Valuation is the cleanest gap. Fourteen analysts rate the stock a strong buy, with a mean price target of $1,820.64 and a range from $1,500 to $2,100. The price is 26.6% below that mean and below even the lowest target. Targets show sentiment, not a floor, and the stock is still 20.9% under its 52-week high of $1,689.89.
What the evidence says
The long-term thesis is intact. The price is above its 40-week average and the weekly trend points up. The stock is up 46.6% this year but 16.1% lower than six months ago, which puts it in a pullback inside a larger uptrend. It is repairing after a peak, not building a new one.
For the next 2 to 6 weeks the balance of evidence leans positive, and conviction is high at 3 of 4 points. The daily trend runs with the weekly uptrend. MPWR has led the S&P 500 over 50 days by 6.8%, and it has led SOXX by 19.3%. The fourth point was not earned, which is why conviction is high rather than maximal. The strongest case against this reading is that today's jump came on volume 13.7% below the 20-day average, so the move has not yet drawn broad participation. SOXX has lost 21.4% in a month, and the stock still trails the S&P 500 over 200 days by 1.9%. Price sits just above the 200-day average, so this may still be a bounce rather than a confirmed turn. It does not tip the balance because the trend alignment and the margin of relative strength are wide, and the stock has held up through a sector drawdown that would normally drag it lower.
Levels that matter
The structure holds above $1,318.93, the 200-day average, which is also where the stock is trading now. A close below it would be the first crack. The $1,300 round number sits just underneath, and the trend ends below $1,274.28, the 50-day average, where the last pullback found its footing.
The breakout level is a daily close above $1,350 on volume above its 20-day average. From there the first target is $1,411.23, a swing zone, at 1.3 to 1 against a stop at $1,301.98, which is the 200-day average minus a quarter of the 14-day ATR of $67.8. The second target is $1,489.84 at 2.9 to 1. The math does not reach 3 to 1. A target beyond $1,489.84, such as the $1,667.95 swing zone, would clear it on paper, but that is a much longer path.
What would change the picture
A weekly close below $1,274.28, the 50-day average, would change the picture. The non-price fact that would do it is management cutting the 150% enterprise-data growth floor or pushing out the $8 billion capacity timeline. That would undercut the case the stock is trading on.
What to watch
- Earnings: the calendar in the data still shows October 29, 2026, the report already out, and the next date is not confirmed here. The number that matters is enterprise-data growth against the 150% floor. Q3 came in at 164.6%.
- Sector events: equipment-maker commentary on bottlenecks and cleanroom space, which hit the stock on October 23 before any company news, and the direction of SOXX after its 21.4% monthly drop.
- Legal: any step beyond the law-firm investigation notices of October 29 and November 3.
- Valuation: at $1,337.18 the stock is 26.6% below the $1,820.64 mean target and below the lowest target of $1,500.