Sifting through countless of stocks in the Insurance 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 Aon plc or Old Republic International 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 Aon plc and Old Republic International Corporation compare based on key financial metrics to determine which better meets your investment needs.

About Aon plc and Old Republic International Corporation

Aon plc operates as a professional services firm in the United States, rest of the Americas, the United Kingdom, Ireland, rest of Europe, the Middle East, Africa, and the Asia Pacific. It operates through Risk Capital and Human Capital segments. The company offers commercial risk solutions comprising retail and insurance brokerage, specialty solutions, global risk consulting, captives management, and affinity programs; health solutions, such as consulting and brokerage, consumer benefits, and talent advisory services; and wealth solutions, including retirement consulting and investments. It also provides treaty and facultative reinsurance; strategy and technology group solutions; insurance-linked securities, capital raising, strategic advice, restructuring, and merger and acquisition services; and risk management products and solutions, capital market solutions, and corporate finance advisory services. In addition, the company offers strategic design advice and actuarial services; pension risk transfer and integrated pension administration; and investment advisory services on developing and maintaining investment programs across various plan types, including defined benefit plans, defined contribution plans, master trusts, and pooled employer plans for corporations, public pensions, endowments, and foundations. Aon plc was incorporated in 1979 and is headquartered in Dublin, Ireland.

Old Republic International Corporation, through its subsidiaries, provides insurance underwriting and related services in the United States and Canada. It operates in two segments, Specialty Insurance and Title Insurance. The Specialty Insurance segment provides lines of coverages, such as accident and health, aviation, commercial auto, commercial multi-peril, commercial property, cyber, environmental, excess and surplus, home and auto warranty, automobile extended warranty, general liability, inland marine, travel accident, and workers' compensation, as well as financial indemnity, including directors and officers, errors and omissions, fidelity, and surety coverages. This segment offers its products to transportation, commercial construction, healthcare, education, retail and wholesale trade, forest products, energy, general manufacturing, and financial services industries. The Title Insurance segment insures against losses arising out of defects, liens and encumbrances affecting the insured title to real estate purchasers and investors. This segment also provides escrow closing and construction disbursement services; and real estate information products; national default management services; and various other services pertaining to real estate transfers and loan transactions. The company was founded in 1923 and is based in Chicago, Illinois.

Latest Insurance and Aon plc, Old Republic International Corporation Stock News

As of July 31, 2026, Aon plc had a $76.5 billion market capitalization, compared to the Insurance median of $7.1 million. Aon plc’s stock is up 2.2% in 2026, down 0.3% in the previous five trading days and up 1.47% in the past year.

Currently, Aon plc’s price-earnings ratio is 19.9. Aon plc’s trailing 12-month revenue is $17.6 billion with a 22.3% net profit margin. Year-over-year quarterly sales growth most recently was 2.2%. Analysts expect adjusted earnings to reach $19.077 per share for the current fiscal year. Aon plc currently has a 0.9% dividend yield.

As of July 31, 2026, Old Republic International Corporation had a $10.3 billion market cap, putting it in the 78th percentile of all stocks. Old Republic International Corporation’s stock is down 5.3% in 2026, up 2.2% in the previous five trading days and up 19.23% in the past year.

Currently, Old Republic International Corporation’s price-earnings ratio is 10.7. Old Republic International Corporation’s trailing 12-month revenue is $9.4 billion with a 11.7% net profit margin. Year-over-year quarterly sales growth most recently was 13.5%. Analysts expect adjusted earnings to reach $2.943 per share for the current fiscal year. Old Republic International Corporation currently has a 8.7% dividend yield.

How We Compare Aon plc and Old Republic International 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 Aon plc and Old Republic International Corporation’s stock grades to see how they measure up against one another.

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Aon plc and Old Republic International Corporation Growth Grades

Company	Ticker	Growth
Aon plc	AON	A
Old Republic International Corporation	ORI	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.

Aon plc has a Growth Score of 100, which is Very Strong. Old Republic International Corporation has a Growth Score of 56, which is Average.

The Growth Grade Winner: Aon plc

As you can clearly see from the Growth Grade breakdown above, Aon plc has a more attractive growth grade than Old Republic International Corporation. For investors who focus solely on how a company is growing relative to other companies in the same industry, Aon plc 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.

Aon plc and Old Republic International Corporation’s Quality Grades

Company	Ticker	Quality
Aon plc	AON	A
Old Republic International Corporation	ORI	C

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.

Aon plc has a Quality Score of 84, which is Very Strong. Old Republic International Corporation has a Quality Score of 59, which is Average.

The Quality Grade Winner: Aon plc

As you can clearly see from the Quality Grade breakdown above, Aon plc has a better overall quality grade than Old Republic International Corporation. For investors who are looking for companies with higher quality than others in the same industry, Aon plc 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.

Aon plc and Old Republic International Corporation’s Momentum Grades

Company	Ticker	Momentum
Aon plc	AON	C
Old Republic International Corporation	ORI	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%.

Aon plc has a Momentum Score of 53, which is Average. Old Republic International Corporation has a Momentum Score of 59, which is Average.

The Momentum Stock Winner: No Clear Winner

Neither Aon plc or Old Republic International Corporation has a strong enough Momentum Grade to be considered a “winner.” Investors considering these companies should do additional due diligence and research to see if either could be a good addition to their portfolios. It’s important to look at a wide range of financial metrics in order to determine if Aon plc or Old Republic International Corporation is the better investment when it comes to momentum.

Other Aon plc and Old Republic International Corporation Grades

In addition to Growth, Momentum and Quality, 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 Aon plc and Old Republic International Corporation pass any of our 60+ stock screens that have outperformed the market since their creation.

So, Which Is the Better Investment, Aon plc or Old Republic International Corporation Stock?

Overall, Aon plc stock has a Growth Score of 100, Momentum Score of 53 and Quality Score of 84.

Old Republic International Corporation stock has a Growth Score of 56, Momentum Score of 59 and Quality Score of 59.

Comparing Aon plc and Old Republic International 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.