Recent activity in Monolithic Power Systems (MPWR) options is drawing fresh attention, with a September 2026 call contract showing unusually high implied volatility and suggesting expectations for a sizable move in the stock.

At a share price of US$1,339.08, Monolithic Power Systems has seen short term share price momentum cool, with a roughly 11% decline over 90 days. However, the year to date share price return of 43.02% and 1 year total shareholder return of 82.58% still point to strong longer term gains.

If this kind of options driven interest has you looking beyond a single semiconductor stock, it may be worth scanning a wider set of power and grid related opportunities through the 35 power grid technology and infrastructure stocks

After a sharp cooling in Monolithic Power Systems' short term momentum but very strong returns over the past year, the real fork in the road is simple: Do you pay up at US$1,339 now or wait for a reset based on the underlying valuation picture next?

Most Popular Narrative: 25.5% Undervalued

Based on the most followed valuation narrative, Monolithic Power Systems' fair value of $1,797.14 sits well above the last close at $1,339.08. This frames the current options action against a story of upside that relies heavily on growth, margins and premium pricing power.

Expectations for long-term automotive segment growth, driven by secular shifts toward EVs, zonal and 48V/800V in-car architectures, and increased semiconductor content per vehicle, are supporting high valuation multiples. However, these trends may already be fully priced in, leading to risk of eventual slower revenue growth as the rollout curve flattens.

Want to see what has to happen across AI servers, autos and margins for that valuation to hold? The earnings mix, growth rates and future P/E assumptions driving this fair value may surprise you.

Result: Fair Value of $1,797.14 (UNDERVALUED)

However, the Monolithic Power Systems story also leans on rich P/E assumptions and high AI and automotive growth expectations, so any disappointment on margins or demand could quickly challenge this upside narrative.

Another View on Monolithic Power Systems Valuation

While the popular narrative flags Monolithic Power Systems as 25.5% undervalued, the current P/E of 96.8x presents a different picture. It is higher than the US Semiconductor industry at 55.8x, the peer average at 96.4x, and above the fair ratio of 46x. That gap raises a simple question for investors: Is the story strong enough to justify paying more than double the fair ratio?

Next Steps

With sentiment split between rich valuation and strong momentum in Monolithic Power Systems, it makes sense to move quickly and test the numbers yourself. To see both sides of the story in one place, review the 2 key rewards and 2 important warning signs.

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This article by Simply Wall St is general in nature. We provide commentary based on historical data and analyst forecasts only using an unbiased methodology and our articles are not intended to be financial advice. It does not constitute a recommendation to buy or sell any stock, and does not take account of your objectives, or your financial situation. We aim to bring you long-term focused analysis driven by fundamental data. Note that our analysis may not factor in the latest price-sensitive company announcements or qualitative material. Simply Wall St has no position in any stocks mentioned.