Sifting through countless of stocks in the Banks 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 First Interstate BancSystem, Inc. or 1st Source 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 First Interstate BancSystem, Inc. and 1st Source Corporation compare based on key financial metrics to determine which better meets your investment needs.

About First Interstate BancSystem, Inc. and 1st Source Corporation

First Interstate BancSystem, Inc. operates as a bank holding company for First Interstate Bank that provides a range of banking products and services in the United States. The company offers various traditional depository products, including checking, savings, and time deposits; and repurchase agreements primarily for commercial and municipal depositors. It also provides a range of trust, employee benefit, investment management, insurance, agency, and custodial services, including administration of estates and personal trusts; manages investment accounts for individuals; employee benefit plans and charitable foundations; and insurance planning. The company’s loan portfolio includes real estate loans, such as commercial real estate, construction, residential, agricultural, and other real estate loans; consumer loans, including direct personal loans, credit card loans and lines of credit, and indirect loans; variable and fixed rate commercial loans for small and medium-sized manufacturing, wholesale, retail, and service businesses for working capital needs and business expansions; and agricultural loans. In addition, it offers marketing, credit review, loan servicing, credit cards servicing, mortgage loan sales and servicing, indirect consumer loan and processing, loan collection services, other operational, and specialized staff support services, as well as online and mobile banking services. The company serves individuals, businesses, municipalities, and other entities in various industries, including agriculture, construction, education, governmental services, healthcare, hospitality, housing, professional services, real estate development, retail, technology, tourism, and wholesale trade. First Interstate BancSystem, Inc. was formerly known as First Interstate Bancsystem Of Montana, Inc. and changed its name to First Interstate BancSystem, Inc. in June 1993. The company was founded in 1879 and is headquartered in Billings, Montana.

1st Source Corporation operates as the bank holding company for 1st Source Bank that provides commercial and consumer banking services, trust and wealth advisory services, and insurance products to individual and business clients in the United States. The company’s consumer banking services, which include checking and savings accounts; certificates of deposit; health savings and individual retirement accounts; online and mobile banking products; consumer loans, real estate mortgage loans, and home equity lines of credit; and financial planning, financial literacy, and other consultative services, as well as debit and credit cards. It also provides commercial, small business, agricultural, and real estate loans for financing of industrial and commercial properties, equipment, inventories, accounts receivables, acquisition, and general corporate purposes; and commercial leasing, treasury management, payment services, Fedwires, ACH and merchant services, and retirement planning services, as well as construction and permanent loans and tax equity investments for community solar, commercial and industrial, small utility scale, university, and municipal projects. In addition, the company offers trust, investment, agency, and custodial services for individual, estate and trust, corporate, and not-for-profit customers, as well as employee benefit plans and charitable foundations. Further, it provides equipment loan and lease products for construction equipment, aircraft, autos and light trucks, and medium and heavy-duty trucks; and financing services for construction equipment, new and pre-owned private and cargo aircraft, and various vehicle types for fleet purposes. Additionally, it offers property, casualty, individual and group health, and life insurance products and services for individuals and businesses; and owns and manages available-for-sale investment securities. 1st Source Corporation was founded in 1863 and is headquartered in South Bend, Indiana.

Latest Banks and First Interstate BancSystem, Inc., 1st Source Corporation Stock News

As of July 31, 2026, First Interstate BancSystem, Inc. had a $3.6 billion market capitalization, compared to the Banks median of $716.9 million. First Interstate BancSystem, Inc.’s stock is up 10.4% in 2026, up 1.2% in the previous five trading days and up 32.94% in the past year.

Currently, First Interstate BancSystem, Inc.’s price-earnings ratio is 12.4. First Interstate BancSystem, Inc.’s trailing 12-month revenue is $1.0 billion with a 30.6% net profit margin. Year-over-year quarterly sales growth most recently was 3.6%. Analysts expect adjusted earnings to reach $2.710 per share for the current fiscal year. First Interstate BancSystem, Inc. currently has a 4.9% dividend yield.

As of July 31, 2026, 1st Source Corporation had a $2.2 billion market cap, putting it in the 55th percentile of all stocks. 1st Source Corporation’s stock is up 44.7% in 2026, up 4.2% in the previous five trading days and up 47.78% in the past year.

Currently, 1st Source Corporation’s price-earnings ratio is 12.9. 1st Source Corporation’s trailing 12-month revenue is $442.4 million with a 38.6% net profit margin. Year-over-year quarterly sales growth most recently was 15.9%. Analysts expect adjusted earnings to reach $7.240 per share for the current fiscal year. 1st Source Corporation currently has a 1.9% dividend yield.

How We Compare First Interstate BancSystem, Inc. and 1st Source 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 First Interstate BancSystem, Inc. and 1st Source Corporation’s stock grades to see how they measure up against one another.

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First Interstate BancSystem, Inc. and 1st Source Corporation Stock Value Grades

Company	Ticker	Value
First Interstate BancSystem, Inc.	FIBK	B
1st Source Corporation	SRCE	B

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.

First Interstate BancSystem, Inc. has a Value Score of 61, which is Value. 1st Source Corporation has a Value Score of 64, which is Value.

The Value Stock Winner: It’s a Tie!

Looking at the Value Grade breakdown above, both First Interstate BancSystem, Inc. and 1st Source Corporation have a Value Grade of B. For investors who focus solely on a company’s valuation, you will need to conduct further research into both of these companies’ other metrics to see if they could be good additions to your portfolio. It’s important for investors to analyze multiple factors based on a wide range of metrics before deciding whether to buy.

First Interstate BancSystem, Inc. and 1st Source Corporation’s Momentum Grades

Company	Ticker	Momentum
First Interstate BancSystem, Inc.	FIBK	B
1st Source Corporation	SRCE	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%.

First Interstate BancSystem, Inc. has a Momentum Score of 64, which is Strong. 1st Source Corporation has a Momentum Score of 80, which is Strong.

The Momentum Grade Winner: It’s a Tie!

Looking at the Momentum Grade breakdown above, both First Interstate BancSystem, Inc. and 1st Source Corporation have a grade of B. 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.

First Interstate BancSystem, Inc. and 1st Source Corporation’s Estimate Revisions Grades

Company	Ticker	Earnings Estimate
First Interstate BancSystem, Inc.	FIBK	B
1st Source Corporation	SRCE	B

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

Estimate revisions offer an indication of what analysts are thinking about the short-term prospects of a firm. Estimate revisions are based on the statistical significance of a firm’s last two quarterly earnings surprises and the percentage change in its consensus estimate for the current fiscal year over the past month and past three months.

First Interstate BancSystem, Inc. has a Earnings Estimate Score of 77, which is Positive. 1st Source Corporation has a Earnings Estimate Score of 73, which is Positive.

The Earnings Estimate Revisions Grade Winner: It’s a Tie!

Looking at the Earnings Estimate Revisions Grade breakdown above, both First Interstate BancSystem, Inc. and 1st Source Corporation have a grade of B. For those focusing solely on a company’s estimate revisions, other financial metrics will need to be evaluated to determine whether First Interstate BancSystem, Inc. or 1st Source Corporation is a better fit.

Other First Interstate BancSystem, Inc. and 1st Source Corporation Grades

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

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.

AAII’s A+ Investor Quality Grade comes from the ranking of key metrics. Specifically, the quality grade is the percentile rank of the composite 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 F-Score.

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 First Interstate BancSystem, Inc. and 1st Source Corporation pass any of our 60+ stock screens that have outperformed the market since their creation.

So, Which Is the Better Investment, First Interstate BancSystem, Inc. or 1st Source Corporation Stock?

Overall, First Interstate BancSystem, Inc. stock has a Value Score of 61, Momentum Score of 64 and Estimate Revisions Score of 77.

1st Source Corporation stock has a Value Score of 64, Momentum Score of 80 and Estimate Revisions Score of 73.

Comparing First Interstate BancSystem, Inc. and 1st Source 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.