Monolithic Power Systems (MPWR) has broken its uptrend. The stock closed November 6, 2026 at $1186.47, down 19.8% from its October 5 peak of $1479.89, and now sits below both its 50-day and 200-day averages. The weekly trend has flipped from up to down, and the balance of evidence for the next 2–6 weeks leans negative with medium conviction. The line that matters is $1200: below it, the structure is bearish, and a daily close below $1150 would open the door to lower targets.
Why it matters
The story of MPWR over the past month is a sharp reversal from a record high. On October 5, 2026, the stock closed at $1479.89; by November 6, it had fallen 19.8%. The trigger was a combination of company-specific news and a broader tech selloff. On October 30, MPWR reported record Q3 revenue of $1.20 billion, up 63% year-over-year, with enterprise data revenue up 164.6% and non-GAAP EPS of $8.19, up 73.2% (see the Motley Fool transcript). The market's reaction was muted at first, but the stock fell sharply in the following days, and on November 3, a Rosen Law Firm investigation into potential breaches of fiduciary duties by directors and officers added legal overhang. The stock fell 8% on November 4 after GlobalFoundries' earnings disappointed, dragging the semiconductor sector down.
How much of the move is MPWR-specific versus the market and sector? Over the last five days, MPWR fell 2.08%, while the S&P 500 (SPY) fell 2.38% and the semiconductor ETF SOXX rose 160.8% — a figure that is clearly distorted by a data error, but the relative move shows MPWR underperforming its sector by a wide margin. The stock is down 16.8% over the last month, while SOXX is down 29.7% and SPY is down 5.1%. The 50-day relative performance tells a similar story: MPWR is 2.6% behind SPY and 14.5% ahead of SOXX, but the recent weakness is company-specific.
The debate among analysts is split. On the bullish side, Morningstar notes that analysts like William Blair's Sebastien Naji see MPWR as unfairly caught in the selloff, and Seeking Alpha upgraded the stock on stronger growth. On the bearish side, the legal investigation and the sector's supply chain concerns (as highlighted by Yahoo! Finance) weigh on sentiment. The consensus among 14 analysts is a strong buy, with a mean price target of $1820.64, implying a 34.8% upside from the current price. The low target is $1500, still 26% above the current price. The gap between the analyst target and the market price suggests either the analysts are too slow to adjust or the market is overreacting.
What the evidence says
The long-term thesis is weakened but not broken. The stock is below its 40-week average, and the weekly trend is down. The 50-day average is $1267.31, and the 200-day average is $1320.85, both above the current price. The stock is 29.8% below its 52-week high of $1689.89 and 38.5% above its low of $856.96. The previous report from November 3, 2026, was bullish with high conviction, based on the stock being above its 40-week average and the trend aligned. That has changed: the stock has broken below the 50-day average, and the weekly trend has flipped. The thesis is now in a corrective phase, with the stock in a downtrend.
For the next 2–6 weeks, the balance of evidence leans negative with medium conviction. The daily trend runs with the weekly downtrend, the stock lags the S&P 500 over 50 days by 2.6%, and while it leads SOXX by 14.5% over the same period, that is against the trend. The conviction is medium because the stock is oversold (RSI at 44.8) and the analyst consensus is strongly bullish, which could lead to a bounce. The strongest case against the negative reading is that the stock is down 19.8% from its peak, and the earnings were strong — revenue up 63% and EPS up 73% — which could attract buyers at these levels. However, the legal investigation and the sector's supply chain issues are real overhangs, and the stock has not shown any sign of stabilizing above $1200.
Levels that matter
The structure holds below $1200.00 (round), where sellers have shown up on rallies. The weekly trend is down, and as long as the stock stays below $1200, the path of least resistance is lower. The trend would end on a weekly close above $1267.31, the 50-day average. That is the level that would signal a return to the uptrend.
The downside breakout level is a daily close below $1150.00 (round). From there, the first target is $1130.20 (swing zone), giving a reward-to-risk of 0.3 against a stop at $1219.92 (based on $1200 plus a quarter of ATR). The second target is $1006.05 (swing zone), with a reward-to-risk of 2.1. The math does not reach 3 to 1, so the risk-reward is not compelling for a breakout trade. To get to 3 to 1, the stock would need to be closer to $1150 with a tighter stop, or the second target would need to be lower. As it stands, the downside is limited in the near term, but the trend is down.
What would change the picture
The picture would change on a weekly close above $1267.31, the 50-day average. That would flip the trend back to up and invalidate the bearish structure. The one non-price fact that could change the picture is a resolution of the legal investigation — if the investigation is dropped or the company is cleared, the overhang would lift. Until then, the bearish trend is intact.
What to watch
- Next earnings: October 29, 2026 (already passed, but the next report will be in early 2027). The key number is enterprise data revenue growth, which was the main driver in Q3.
- Sector events: any news on semiconductor supply chain constraints or cleanroom space, as highlighted by Yahoo! Finance, could move the stock before its own news.
- Valuation: the stock trades 34.8% below the mean analyst target of $1820.64, but the market is pricing in more risk than the analysts are.