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 Amkor Technology, Inc., Monolithic Power Systems or Inc. 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 Amkor Technology, Inc., Monolithic Power Systems and Inc. compare based on key financial metrics to determine which better meets your investment needs.

About Amkor Technology, Inc., Monolithic Power Systems and Inc.

Amkor Technology, Inc. provides outsourced semiconductor packaging and test services in the United States, Japan, Europe, and the Asia Pacific. It offers turnkey packaging and test services, including semiconductor wafer bump, wafer probe, wafer back-grind, package design, packaging, system-level and final test, and drop shipment services; flip chip scale package products for smartphones, tablets, and other mobile consumer electronic devices; flip chip stacked chip scale packages that are used to stack memory digital baseband, and as applications processors in mobile devices; flip-chip ball grid array packages for various networking, storage, computing, automotive, and consumer applications; and memory products for system memory or platform data storage. The company provides wafer-level CSP packages for power management, transceivers, sensors, wireless charging, codecs, radar, and specialty silicon; wafer-level fan-out packages used in power management, transceivers, radar, and specialty silicon; silicon wafer integrated fan-out technology that replaces a laminate substrate with a thinner structure; leadframe packages for electronic devices and mixed-signal applications; and substrate-based wirebond packages used to connect a die to a substrate. In addition, it offers micro-electro-mechanical systems packages that are miniaturized mechanical and electromechanical devices; and advanced system-in-package modules used in radio frequency and front end modules, basebands, connectivity, fingerprint sensors, display and touch screen drivers, sensors and MEMS, and NAND memory and solid-state drives. Further, the company provides wafer, package, and system level test services, as well as burn-in test and test development services. It serves integrated device manufacturers, fabless semiconductor companies, original equipment manufacturers, and contract foundries. Amkor Technology, Inc. was founded in 1968 and is headquartered in Tempe, Arizona.

Monolithic Power Systems, Inc. designs, develops, markets, and sells semiconductor-based power electronics solutions for the storage and computing, automotive, enterprise data, consumer, communications, and industrial markets in the United States, China, Taiwan, South Korea, Europe, Southeast Asia, Japan, and internationally. The company provides direct current (DC) to DC integrated circuits (ICs) that are used to convert and control voltages of various electronic systems, such as cloud-based and on-premises CPU servers, server artificial intelligence applications, storage applications, notebooks, infotainment, workstation applications, power sources, home appliances, and network infrastructure and satellite communications applications. It also offers alternating current to DC, driver metal-oxide-semiconductor field-effect transistor, power management ICs, current limit switch, and lighting control products. The company sells its products through third-party distributors, value-added resellers, end customers and other resellers, original design manufacturers, and original equipment manufacturers. Monolithic Power Systems, Inc. was incorporated in 1997 and is headquartered in Kirkland, Washington.

Latest Semiconductors & Semiconductor Equipment and Amkor Technology, Inc., Monolithic Power Systems, Inc. Stock News

As of December 2, 2025, Amkor Technology, Inc. had a $10.0 billion market capitalization, compared to the Semiconductors & Semiconductor Equipment median of $2.6 million. Amkor Technology, Inc.’s stock is up 67.6% in 2025, up 27.4% in the previous five trading days and up 43.61% in the past year.

Currently, Amkor Technology, Inc.’s price-earnings ratio is 30.4. Amkor Technology, Inc.’s trailing 12-month revenue is $6.4 billion with a 4.8% net profit margin. Year-over-year quarterly sales growth most recently was 6.7%. Analysts expect adjusted earnings to reach $1.254 per share for the current fiscal year. Amkor Technology, Inc. currently has a 0.9% dividend yield.

As of December 2, 2025, Monolithic Power Systems, Inc. had a $45.6 billion market cap, putting it in the 93rd percentile of all stocks. Monolithic Power Systems, Inc.’s stock is up 60.4% in 2025, up 4.5% in the previous five trading days and up 62.28% in the past year.

Currently, Monolithic Power Systems, Inc.’s price-earnings ratio is 23.6. Monolithic Power Systems, Inc.’s trailing 12-month revenue is $2.7 billion with a 71.2% net profit margin. Year-over-year quarterly sales growth most recently was 18.9%. Analysts expect adjusted earnings to reach $17.698 per share for the current fiscal year. Monolithic Power Systems, Inc. currently has a 0.7% dividend yield.

How We Compare Amkor Technology, Inc., Monolithic Power Systems and Inc. 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 Amkor Technology, Inc., Monolithic Power Systems and Inc.’s stock grades to see how they measure up against one another.

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Amkor Technology, Inc., Monolithic Power Systems and Inc. Growth Grades

Company	Ticker	Growth
Amkor Technology, Inc.	AMKR	B
Monolithic Power Systems, Inc.	MPWR	B

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.

Amkor Technology, Inc. has a Growth Score of 72, which is Strong. Monolithic Power Systems, Inc. has a Growth Score of 70, which is Strong.

The Growth Grade Winner: It’s a Tie!

Looking at the Growth Grade breakdown above, both Amkor Technology, Inc., Monolithic Power Systems and Inc. have a grade of B. For investors who focus solely on a company’s upward growth, further research should be conducted into both companies’ other financial metrics before deciding whether to invest.

Amkor Technology, Inc., Monolithic Power Systems and Inc.’s Quality Grades

Company	Ticker	Quality
Amkor Technology, Inc.	AMKR	C
Monolithic Power Systems, Inc.	MPWR	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.

Amkor Technology, Inc. has a Quality Score of 45, which is Average. Monolithic Power Systems, Inc. has a Quality Score of 83, which is Very Strong.

The Quality Grade Winner: Monolithic Power Systems, Inc.

As you can clearly see from the Quality Grade breakdown above, Monolithic Power Systems, Inc. has a better overall quality grade than Amkor Technology, Inc.. For investors who are looking for companies with higher quality than others in the same industry, Monolithic Power Systems, Inc. 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.

Amkor Technology, Inc., Monolithic Power Systems and Inc.’s Momentum Grades

Company	Ticker	Momentum
Amkor Technology, Inc.	AMKR	A
Monolithic Power Systems, Inc.	MPWR	A

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%.

Amkor Technology, Inc. has a Momentum Score of 90, which is Very Strong. Monolithic Power Systems, Inc. has a Momentum Score of 82, which is Very Strong.

The Momentum Grade Winner: It’s a Tie!

Looking at the Momentum Grade breakdown above, both Amkor Technology, Inc., Monolithic Power Systems and Inc. have a grade of A. For those who focus solely on a company’s momentum, further research will need to be conducted into both companies to see if they fit your individual needs as an investor.

Other Amkor Technology, Inc., Monolithic Power Systems and Inc. Grades

In addition to Momentum, Quality 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 Amkor Technology, Inc., Monolithic Power Systems and Inc. pass any of our 60+ stock screens that have outperformed the market since their creation.

So, Which Is the Better Investment, Amkor Technology, Inc., Monolithic Power Systems or Inc. Stock?

Overall, Amkor Technology, Inc. stock has a Growth Score of 72, Momentum Score of 90 and Quality Score of 45.

Monolithic Power Systems, Inc. stock has a Growth Score of 70, Momentum Score of 82 and Quality Score of 83.

Comparing Amkor Technology, Inc., Monolithic Power Systems and Inc.’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.