What filters should I set to find undervalued bank stocks?

Set P/B below 1.0-1.2x as the primary filter, add profitability floors (ROE above 7-8%, ROAA above 0.70%), and include P/E below 10-12x for a second valuation check. The profitability thresholds are what separate genuinely undervalued banks from value traps where the low price is deserved.

The difference between a cheap bank stock and an undervalued one comes down to fundamentals. A bank trading at a low price relative to its book value or earnings is only undervalued if its financial performance doesn't justify the discount. Your screening filters need to capture both sides: a low price and healthy operations.

Start with Price to Book

Price to Book (P/B) is the primary valuation filter for bank stocks. Banks trading below 1.0x book value are priced below the accounting value of their net assets, which can signal a genuine bargain or a reflection of real problems. Banks in the 1.0x to 1.2x range may also be underpriced if their profitability supports a higher multiple.

The ROE-P/B framework explains why these thresholds matter. A bank that earns exactly its cost of equity (roughly 8-10% for most banks) should theoretically trade at 1.0x book value. Banks earning above their cost of equity deserve a premium, and banks earning below it are rationally discounted. When you find a bank with strong ROE trading at or below 1.0x book, the market may be mispricing it.

For a broader net, consider adding Price to Tangible Book Value (P/TBV) as a secondary filter. Tangible book strips out goodwill and other intangible assets, giving a more conservative picture of a bank's underlying asset value. This matters more for banks that have made acquisitions, since acquired goodwill can inflate standard book value.

Add Profitability Floors

Without profitability filters, a low-P/B screen will fill up with struggling banks. The market discounts banks with weak earnings for good reason, so you need floors that separate value from value traps.

The two most useful profitability floors:

ROE above 7-8%: This ensures the bank earns close to or above its cost of equity. A bank with P/B of 0.7x and ROE of 3% is cheap because its earnings can't justify a higher price. A bank with P/B of 0.7x and ROE of 10% looks mispriced.

ROAA above 0.70%: Return on Average Assets measures profitability independent of leverage. Some banks inflate ROE through aggressive leverage rather than strong operations. Pairing ROAA with ROE catches banks that are genuinely well-run, not just levered up.

Layer in an Earnings Filter

P/E ratio gives you a complementary valuation view from the earnings side. Bank P/E ratios typically range from 8x to 15x, so screening for P/E below 10x to 11x identifies banks trading at the cheaper end of that spectrum.

Combining P/B and P/E filters narrows results to banks that appear inexpensive on both an asset basis and an earnings basis. A bank that screens cheap on only one measure may have specific circumstances worth investigating, but banks discounted on both dimensions are stronger screening candidates.

Don't Ignore Asset Quality

Many value screens skip credit quality filters, which is a common and costly oversight. Deteriorating loan portfolios are the single most frequent reason markets discount bank stocks, and often rightfully so. Adding asset quality filters helps you distinguish between banks that are cheap due to market sentiment and banks that are cheap because of real credit problems.

Two filters to consider:

Non-Performing Assets (NPA) ratio below 1.5-2.0%: This screens out banks with elevated problem loans. Lower is better, but setting the threshold too tight will exclude banks operating in normal credit environments.

Texas Ratio below 50%: The Texas Ratio compares non-performing assets to tangible equity plus loan loss reserves. A ratio above 100% has historically signaled serious trouble. Screening below 50% keeps the focus on banks with manageable credit exposure.

These filters won't catch every credit problem (some issues emerge between reporting periods), but they screen out the most obvious cases where a low valuation reflects genuine distress.

Alternative Valuation Approaches

The Graham Number offers a different angle on valuation. It calculates a maximum fair price using earnings per share (EPS) and book value per share (BVPS), producing a single number you can compare directly against the current stock price. Banks trading below their Graham Number may deserve closer investigation.

The Margin of Safety metric extends this by showing the percentage discount or premium to the Graham Number. Screening for a positive Margin of Safety means you're only looking at banks priced below what the Graham formula suggests they're worth.

Putting the Screen Together

A practical starting combination:

P/B below 1.2x

ROE above 7%

ROAA above 0.70%

P/E below 12x

NPA ratio below 1.5%

Sort results by P/B ascending to see the most discounted banks first. This combination should produce a manageable list of banks that are cheap on multiple measures while maintaining minimum quality standards.

You can tighten or loosen individual thresholds depending on how many results you want. If the screen returns too few banks, try widening P/B to 1.3x or dropping the ROE floor to 6%. If it returns too many, tighten P/E to 10x or add the Texas Ratio filter below 40%.

Adjusting for Bank Size

These filter thresholds work as starting points, but they don't apply equally to every type of bank.

Community banks (under $10 billion in assets) often trade at lower P/B multiples than larger banks simply because they're less liquid and less widely followed by analysts. A P/B of 0.8x on a community bank might reflect thin trading volume rather than fundamental problems. Community banks also tend to run slightly lower ROE than their larger peers due to higher efficiency ratios, so consider dropping the ROE floor to 6-7% for this group.

Regional and larger banks attract more analyst coverage, and their prices tend to reflect available information more efficiently. A low P/B on a well-covered regional bank is more likely to signal that the market sees something specific it doesn't like. Pay closer attention to the reasons behind the discount for these names.

After the Screen

No screen replaces the work of reading financial filings and understanding why a particular bank is trading at a discount. A screen is a starting point that narrows the universe from hundreds of banks down to a manageable review list.

For each bank that passes your filters, dig into what's behind the numbers. Some discounts reflect temporary market dislocations, investor neglect of small or obscure names, or overreaction to a single bad quarter. Other discounts reflect genuine problems: deteriorating credit quality, concentrated loan portfolios, management turnover, or shrinking margins. The screen can't distinguish between these on its own.

Look at whether the bank's metrics are stable or trending in the wrong direction. A bank with strong current ROE but declining net interest margin and rising non-performing loans may be at the front end of a problem that hasn't fully materialized. The screen captures a snapshot; the filings tell you the trajectory.