Sifting through countless of stocks in the Semiconductors & Semiconductor Equipment industry can be tedious, and sometimes two stocks are just too similar to judge which is the better investment. If you’re on the fence about investing in Monolithic Power Systems, Inc. or ON Semiconductor Corporation because you’re not sure how they measure up, it’s important to compare them on a few factors before making your decision.

Read on to learn how Monolithic Power Systems, Inc. and ON Semiconductor Corporation compare based on key financial metrics to determine which better meets your investment needs.

About Monolithic Power Systems, Inc. and ON Semiconductor Corporation

Monolithic Power Systems, Inc. provides semiconductor-based power electronics solutions in China, Taiwan, South Korea, Southeast Asia, Europe, the United States, Japan, and internationally. The company offers direct current (DC) to DC solutions to convert and control voltages within a range of electronic systems, such as cloud-based and on-premises CPU servers and workstations, AI systems, memory, storage solutions, notebooks, infotainment, power sources, home appliances, network infrastructure, and satellite communications. It also provides alternating current (AC) to DC; driver metal-oxide-semiconductor field-effect transistors; power management integrated circuits (ICs); and current limit switch and lighting control products. The company serves storage and computing, enterprise data, automotive, communications, consumer, and industrial end markets through third-party distributors and value-added resellers. Monolithic Power Systems, Inc. was incorporated in 1997 and is based in West Palm Beach, Florida.

ON Semiconductor Corporation provides intelligent sensing and power solutions in Hong Kong, Singapore, the United Kingdom, the United States, and internationally. It operates through three segments: Power Solutions Group, Analog and Mixed-Signal Group, and Intelligent Sensing Group. The Power Solutions Group segment offers discrete, module, and integrated semiconductor devices designed to enable power conversion, including power switching, signal conditioning, and circuit protection technologies. Its Analog and Mixed-Signal Group segment designs and develops analog and mixed-signal solutions, including power management, sensor interface, connectivity, and standard products for automotive, industrial automation, AI data centers, computing, and mobile end markets. The Intelligent Sensing Group segment develops complementary metal-oxide-semiconductor image sensors, image signal processors, short-wave infrared sensors, and other products, as well as photon-counting technologies, including single-photon avalanche diode arrays and silicon photomultiplier devices for depth sensing, factory automation, safety systems, and robotics industries. ON Semiconductor Corporation was incorporated in 1992 and is headquartered in Scottsdale, Arizona.

Latest Semiconductors & Semiconductor Equipment and Monolithic Power Systems, Inc., ON Semiconductor Corporation Stock News

As of September 4, 2026, Monolithic Power Systems, Inc. had a $60.1 billion market capitalization, compared to the Semiconductors & Semiconductor Equipment median of $4.8 million. Monolithic Power Systems, Inc.’s stock is up 35% in 2026, down 2.6% in the previous five trading days and up 44.3% in the past year.

Currently, Monolithic Power Systems, Inc.’s price-earnings ratio is 74.7. Monolithic Power Systems, Inc.’s trailing 12-month revenue is $3.3 billion with a 24.5% net profit margin. Year-over-year quarterly sales growth most recently was 47.5%. Analysts expect adjusted earnings to reach $27.431 per share for the current fiscal year. Monolithic Power Systems, Inc. currently has a 0.7% dividend yield.

As of September 4, 2026, ON Semiconductor Corporation had a $29.0 billion market cap, putting it in the 89th percentile of all stocks. ON Semiconductor Corporation’s stock is up 37.4% in 2026, up 2.4% in the previous five trading days and up 54.77% in the past year.

Currently, ON Semiconductor Corporation’s price-earnings ratio is 47.6. ON Semiconductor Corporation’s trailing 12-month revenue is $6.2 billion with a 10.2% net profit margin. Year-over-year quarterly sales growth most recently was 9.2%. Analysts expect adjusted earnings to reach $3.202 per share for the current fiscal year. ON Semiconductor Corporation does not currently pay a dividend.

How We Compare Monolithic Power Systems, Inc. and ON Semiconductor Corporation Stock Grades

Stock evaluation requires access to huge amounts of data and the knowledge and time to sift through it all, make sense of financial ratios, read income statements and analyze recent stock movements. AAII created A+ Investor, a robust data suite that condenses data research in an actionable and customizable way suitable for investors of all knowledge levels, to help investors streamline and work through such data.

AAII’s proprietary stock grades come with A+ Investor. These offer intuitive A‐F grades for each of five key investing factors: value, growth, momentum, earnings estimate revisions and quality. Here, we’ll take a closer look at Monolithic Power Systems, Inc. and ON Semiconductor Corporation’s stock grades to see how they measure up against one another.

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Monolithic Power Systems, Inc. and ON Semiconductor Corporation Growth Grades

Company	Ticker	Growth
Monolithic Power Systems, Inc.	MPWR	B
ON Semiconductor Corporation	ON	C

The foundation of growth investing is seeking out stocks of companies exhibiting strong, consistent and prolonged growth that is expected to continue into the future.

In order to compute the growth score and assign it a letter grade, the percentile ranks for each of three components‐consistency of annual sales growth, five-year sales growth rankings adjusted for extreme levels, and consistency of positive annual cash from operations‐must be determined. These three rank figures are added together, and the sum is ranked against the entire stock universe to arrive at a company’s Growth Score to create an equal distribution of grades.

The companies in the bottom 20% of the stock universe receive Growth Grades of F, considered to be very weak, while those in the top 20% receive A grades, which are considered very strong.

Monolithic Power Systems, Inc. has a Growth Score of 69, which is Strong. ON Semiconductor Corporation has a Growth Score of 43, which is Average.

The Growth Grade Winner: Monolithic Power Systems, Inc.

As you can clearly see from the Growth Grade breakdown above, Monolithic Power Systems, Inc. has a more attractive growth grade than ON Semiconductor Corporation. For investors who focus solely on how a company is growing relative to other companies in the same industry, Monolithic Power Systems, Inc. could be a good stock to add to their portfolio. However, it’s important for investors to analyze multiple factors based on a wide range of metrics before deciding whether to buy.

Monolithic Power Systems, Inc. and ON Semiconductor Corporation’s Quality Grades

Company	Ticker	Quality
Monolithic Power Systems, Inc.	MPWR	B
ON Semiconductor Corporation	ON	A

Like the Value Grade, AAII’s A+ Investor Quality Grade comes from the percentile rank of key metrics. Specifically, the Quality Score is the percentile rank of the average of the percentile ranks of return on assets (ROA), return on invested capital (ROIC), gross profit relative to assets, buyback yield, change in total liabilities to assets, accruals, Z double prime bankruptcy risk (Z) score and the F-Score.

The score is variable, meaning it can consider all eight measures or, should any of the eight measures not be valid, the remaining measures that are valid. To be assigned a Quality Score, stocks must have a valid (non-null) measure and corresponding ranking for at least four of the eight quality measures.

The Quality Score is used to assess the underlying “quality” of a particular stock. A higher-quality stock possesses traits associated with upside potential and reduced downside risk. Backtesting of the Quality Grade shows that stocks with higher grades, on average, outperformed stocks with lower grades over the period of 1998 through 2019.

Stocks receive better grades (higher scores) for having higher scores for the quality subcomponents and worse grades (lower scores) for lower scores for the subcomponents.

Monolithic Power Systems, Inc. has a Quality Score of 73, which is Strong. ON Semiconductor Corporation has a Quality Score of 82, which is Very Strong.

The Quality Grade Winner: ON Semiconductor Corporation

As you can clearly see from the Quality Grade breakdown above, ON Semiconductor Corporation has a better overall quality grade than Monolithic Power Systems, Inc.. For investors who are looking for companies with higher quality than others in the same industry, ON Semiconductor Corporation could be a good stock to add to their portfolios. However, it’s important for investors to analyze multiple factors based on a wide range of metrics before deciding whether to buy.

Monolithic Power Systems, Inc. and ON Semiconductor Corporation’s Momentum Grades

Company	Ticker	Momentum
Monolithic Power Systems, Inc.	MPWR	C
ON Semiconductor Corporation	ON	B

Momentum grades help to uncover stocks experiencing anomalously high rates of return; research finds that stocks with high relative levels of momentum tend to outperform, whereas those with low levels of momentum tend to continue underperforming. Momentum is based on the price change of a stock over a specified period relative to all other stocks.

Typically, AAII looks at the weighted relative strength over the trailing four quarters. The weighted four-quarter relative strength rank is the relative price change for each of the past four quarters. The most recent quarterly price change is given a weight of 40% and each of the three previous quarters are given a weighting of 20%.

Monolithic Power Systems, Inc. has a Momentum Score of 54, which is Average. ON Semiconductor Corporation has a Momentum Score of 67, which is Strong.

The Momentum Grade Winner: ON Semiconductor Corporation

As you can clearly see from the Momentum Grade breakdown above, ON Semiconductor Corporation is considered to have stronger momentum compared to Monolithic Power Systems, Inc.. For those specifically looking for companies that have stronger momentum compared to other companies in the same industry, ON Semiconductor Corporation could be a good stock to invest in. However, it’s important for investors to analyze multiple factors based on a wide range of metrics before deciding whether to buy.

Other Monolithic Power Systems, Inc. and ON Semiconductor Corporation Grades

In addition to Quality, Momentum and Growth, A+ Investor also provides grades for Value and Estimate Revisions.

Earnings estimate revisions scores take into account the magnitude of a company’s earnings surprise in its last two reported fiscal quarters. Often, surprises beget further surprises‐or at least continued sales growth (the exact opposite is generally true, too).

Successful stock investing involves buying low and selling high, so stock valuation is an important consideration for stock selection. Buying stocks that are going to go up typically means buying stocks that are undervalued in the first place, although momentum investors may argue that point.

These 2 key factors, when combined with the above, provide a holistic view into a particular stock. Further, by joining A+ Investor you can see whether Monolithic Power Systems, Inc. and ON Semiconductor Corporation pass any of our 60+ stock screens that have outperformed the market since their creation.

So, Which Is the Better Investment, Monolithic Power Systems, Inc. or ON Semiconductor Corporation Stock?

Overall, Monolithic Power Systems, Inc. stock has a Growth Score of 69, Momentum Score of 54 and Quality Score of 73.

ON Semiconductor Corporation stock has a Growth Score of 43, Momentum Score of 67 and Quality Score of 82.

Comparing Monolithic Power Systems, Inc. and ON Semiconductor Corporation’s grades, scores and metrics can act as a solid basis to determine whether they may be a good investment or not. You’ll also want to look at your portfolio’s asset allocation as well as your risk tolerance and financial goals to see if either of these stocks would make a good fit for you. AAII can help you figure out which investments align with your individual needs and preferences.

Investors are encouraged to do their own due diligence and research. In this way, individuals can effectively become managers of their own assets‐without having to rely on others for financial independence. You can count on AAII for timeless articles on financial planning and stock-picking, unbiased research and actionable analysis.

A+ Investor adds to our qualitative teaching with a powerful data suite to help you whittle down investment choices to find stocks, exchange-traded funds (ETFs) or mutual funds that meet your needs.

AAII Disclaimer

We make no representations or warranties that any investor will, or is likely to, achieve profits similar to those shown, because past, hypothetical or simulated performance is not necessarily indicative of future results. Before making an investment decision, you should consider your circumstances and whether the information on our content is applicable to your situation. This information was prepared in good faith, and we accept no liability for any errors or omissions. The full disclaimer can be read here.