Sifting through countless of stocks in the Capital Markets 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 Affiliated Managers Group, Inc., Miami International Holdings 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 Affiliated Managers Group, Inc., Miami International Holdings and Inc. compare based on key financial metrics to determine which better meets your investment needs.

About Affiliated Managers Group, Inc., Miami International Holdings and Inc.

Affiliated Managers Group, Inc., through its affiliates, operates as an investment management company providing investment management services to mutual funds, institutional clients,retails and high net worth individuals in the United States. It provides advisory or sub-advisory services to mutual funds. These funds are distributed to retail, high net worth and institutional clients directly and through intermediaries, including independent investment advisors, retirement plan sponsors, broker-dealers, major fund marketplaces, and bank trust departments. The company also offers investment products in various investment styles in the institutional distribution channel, including small, small/mid, mid, and large capitalization value and growth equity, and emerging markets. In addition, it offers quantitative, alternative, and fixed income products, and manages assets for foundations and endowments, defined benefit, and defined contribution plans for corporations and municipalities. Affiliated Managers Group provides investment management or customized investment counseling and fiduciary services. Affiliated Managers Group, Inc. was formed in 1993 and is based in West Palm Beach, Florida with additional offices in Prides Crossing, Massachusetts; Stamford, Connecticut; London, United Kingdom; Dubai, United Arab Emirates; Sydney, Australia; Hong Kong; Tokyo, Japan, Zurich, Switzerland and Delaware.

Miami International Holdings, Inc., through its subsidiaries, builds and operates various financial marketplaces in the United States. It operates through Options, Equities, and International segments. The company’s markets include options through MIAX Options, MIAX Pearl, MIAX Emerald, and MIAX Sapphire; U.S. equities through MIAX Pearl Equities; U.S. futures and options on futures through MIAX Futures; and international listings through BSX and TISE. It also trades Hard Red Spring Wheat futures and options on MIAX Futures; provides clearing services for U.S. futures and options on futures through MIAX Futures Clearing; and owns Dorman Trading, a full-service futures commission merchant provides execution and clearing services for introducing brokers, retail customers, institutional clients, and professional traders. In addition, the company offers financial markets and securities services to public and private companies. Miami International Holdings, Inc. was incorporated in 2007 and is headquartered in Princeton, New Jersey.

Latest Capital Markets and Affiliated Managers Group, Inc., Miami International Holdings, Inc. Stock News

As of August 27, 2026, Affiliated Managers Group, Inc. had a $9.6 billion market capitalization, compared to the Capital Markets median of $3.4 million. Affiliated Managers Group, Inc.’s stock is up 28.5% in 2026, up 5.1% in the previous five trading days and up 63.71% in the past year.

Currently, Affiliated Managers Group, Inc.’s price-earnings ratio is 12.8. Affiliated Managers Group, Inc.’s trailing 12-month revenue is $2.3 billion with a 37.7% net profit margin. Year-over-year quarterly sales growth most recently was 29.9%. Analysts expect adjusted earnings to reach $36.985 per share for the current fiscal year. Affiliated Managers Group, Inc. does not currently pay a dividend.

As of August 27, 2026, Miami International Holdings, Inc. had a $4.4 billion market cap, putting it in the 65th percentile of all stocks. Miami International Holdings, Inc.’s stock is down 0.7% in 2026, up 6.6% in the previous five trading days and up 29.94% in the past year.

Currently, Miami International Holdings, Inc.’s price-earnings ratio is 26.6. Miami International Holdings, Inc.’s trailing 12-month revenue is $1.5 billion with a 9.7% net profit margin. Year-over-year quarterly sales growth most recently was 18.2%. Analysts expect adjusted earnings to reach $1.720 per share for the current fiscal year. Miami International Holdings, Inc. does not currently pay a dividend.

How We Compare Affiliated Managers Group, Inc., Miami International Holdings 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 Affiliated Managers Group, Inc., Miami International Holdings and Inc.’s stock grades to see how they measure up against one another.

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Affiliated Managers Group, Inc., Miami International Holdings and Inc. Stock Value Grades

Company	Ticker	Value
Affiliated Managers Group, Inc.	AMG	B
Miami International Holdings, Inc.	MIAX	D

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.

AAII’s A+ Investor Value Grade derives from a stock’s value score. The Value Score is the percentile rank of the average of the percentile ranks of the price-to-sales ratio, price-earnings ratio, enterprise-value-to-EBITDA (EV/EBITDA) ratio, shareholder yield, price-to-book-value ratio and price-to-free-cash-flow ratio. The score is variable, meaning it can consider all six ratios or, should any of the six ratios not be valid, the remaining ratios that are valid. To be assigned a Value Score, stocks must have a valid (non-null) ratio and corresponding ranking for at least two of the six valuation ratios.

Stocks with a Value Score from 81 to 100 are considered deep value, those with a score between 61 and 80 are a good value and so on.

Affiliated Managers Group, Inc. has a Value Score of 67, which is Value. Miami International Holdings, Inc. has a Value Score of 28, which is Expensive.

The Value Stock Winner: Affiliated Managers Group, Inc.

As you can clearly see from the Value Grade breakdown above, Affiliated Managers Group, Inc. is considered to have better value than Miami International Holdings, Inc.. For investors who focus solely on a company’s valuation, Affiliated Managers Group, 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.

Affiliated Managers Group, Inc., Miami International Holdings and Inc.’s Quality Grades

Company	Ticker	Quality
Affiliated Managers Group, Inc.	AMG	A
Miami International Holdings, Inc.	MIAX	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.

Affiliated Managers Group, Inc. has a Quality Score of 85, which is Very Strong. Miami International Holdings, Inc. has a Quality Score of 91, which is Very Strong.

The Quality Grade Winner: It’s a Tie!

Looking at the Quality Grade breakdown above, both Affiliated Managers Group, Inc., Miami International Holdings and Inc. have a grade of A. For investors who focus solely on a company’s overall quality, you will need to conduct further research into both companies to see if they are a good fit for your portfolio. As a good rule of thumb, you should always analyze multiple factors based on a wide range of metrics before choosing a company to invest in.

Affiliated Managers Group, Inc., Miami International Holdings and Inc.’s Momentum Grades

Company	Ticker	Momentum
Affiliated Managers Group, Inc.	AMG	A
Miami International Holdings, Inc.	MIAX	C

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%.

Affiliated Managers Group, Inc. has a Momentum Score of 83, which is Very Strong. Miami International Holdings, Inc. has a Momentum Score of 53, which is Average.

The Momentum Grade Winner: Affiliated Managers Group, Inc.

As you can clearly see from the Momentum Grade breakdown above, Affiliated Managers Group, Inc. is considered to have stronger momentum compared to Miami International Holdings, Inc.. For those specifically looking for companies that have stronger momentum compared to other companies in the same industry, Affiliated Managers Group, Inc. 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 Affiliated Managers Group, Inc., Miami International Holdings and Inc. Grades

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

Growth investing builds on the idea that stocks of companies exhibiting strong, consistent and prolonged growth outperform those of slower-growth companies. AAII measures growth through consistency of annual sales growth, five-year sales growth rankings adjusted for extreme levels, and consistency of positive annual cash from operations.

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 Affiliated Managers Group, Inc., Miami International Holdings and Inc. pass any of our 60+ stock screens that have outperformed the market since their creation.

So, Which Is the Better Investment, Affiliated Managers Group, Inc., Miami International Holdings or Inc. Stock?

Overall, Affiliated Managers Group, Inc. stock has a Value Score of 67, Momentum Score of 83 and Quality Score of 85.

Miami International Holdings, Inc. stock has a Value Score of 28, Momentum Score of 53 and Quality Score of 91.

Comparing Affiliated Managers Group, Inc., Miami International Holdings 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.