NASDAQ: FIBK · Regional Banks
First Interstate BancSystem (FIBK) fair value: undervalued or overvalued?
As of 29 Sep 2026, Faircurve's model values First Interstate BancSystem (FIBK) at $27.90 a share. The stock last closed at $36.00, which puts the model's fair value 22.5% below the price. On the model's bands that reads as Overvalued.
Revalued . Price is the close of 2 Oct 2026. First Interstate BancSystem, Inc.
Faircurve Insights · 29 Sep 2026
First Interstate BancSystem, Inc. functions as the parent company of First Interstate Bank, delivering a comprehensive suite of financial products and services across the United States.
On 29 Sep 2026, Faircurve's model gave a fair value of $27.90 a share, the midpoint of 2,000 simulations. The previous run on 26 Sep 2026 gave $28.59, and the fair value moved -2.4%. The model's calibrated range over 63 trading days is $23.41 to $34.02, built from the fair value since there is no live options data for the stock. This range held the price 60% of the time at this horizon, and the evidence grade is High.
The business scores on quality against comparable companies: BancFirst Corporation (BANF), Renasant Corporation (RNST), First Financial Bancorp. (FFBC), Simmons First National Corporation (SFNC), Park National Corporation (PRK), Independent Bank Corp. (INDB), Community Bank System, Inc. (CBU), CVB Financial Corp. (CVBF). Moves around the last 8 earnings reports show a median size of 2.2%, ignoring direction.
Written from the figures on this page for the 29 Sep 2026 valuation and checked by rule before publishing: every number is one printed here, no forecast, no instruction. The price, the gap and the verdict are the page's own and change daily. Not a recommendation.
What price range does the model give FIBK?
The calibrated range for FIBK over 63 trading days is $23.41 to $34.02. There is no live options data for this stock, so the range is built from the fair value and calibrated weekly against realised prices (n = 4,327 past valuations, refreshed 26 Sep 2026). Ranges built this way held the price 60% of the time at this horizon.
The price is above this range. For names with fair value 15%+ below price, the calibrated range has held the price 40% of the time over 63 trading days, and 58% ended above it; the typical move was −0.1%.
The model's own simulated range, from the 20th to the 80th percentile of its runs, is $21.66 to $35.28. In 17% of the simulations the fair value came out above the price the model ran on.
How does FIBK compare with similar companies?
The companies in regional banks closest to First Interstate BancSystem in market value, each on the same model and the same date.
| Company | Last close | Model fair value | Gap | Model verdict |
|---|---|---|---|---|
| BANF BancFirst Corporation | $108.08 | $92.97 | -14.0% | Fairly valued |
| RNST Renasant Corporation | $39.92 | $34.73 | -13.0% | Fairly valued |
| FFBC First Financial Bancorp. | $31.87 | $27.78 | -12.8% | Fairly valued |
| SFNC Simmons First National Corporation | $22.90 | $20.44 | -10.7% | Overvalued |
| PRK Park National Corporation | $183.15 | $134.97 | -26.3% | Overvalued |
| INDB Independent Bank Corp. | $80.06 | $63.18 | -21.1% | Overvalued |
| CBU Community Bank System, Inc. | $60.69 | $40.50 | -33.3% | Overvalued |
| CVBF CVB Financial Corp. | $22.28 | $15.26 | -31.5% | Overvalued |
When does FIBK report earnings, and how has the stock reacted?
First Interstate BancSystem's next earnings report is scheduled for 28 Oct 2026. Companies can move their dates.
How FIBK moved around its last 8 earnings reports
Each move runs from the last close before the report to the first close after it, so it covers companies that report before the open and after the close. The median size across these 8 reports, ignoring direction, was 2.2%.
| Report date | Two session move |
|---|---|
| 23 Jul 2026 | -0.7% |
| 29 Apr 2026 | -0.5% |
| 28 Jan 2026 | -2.0% |
| 29 Oct 2025 | -2.4% |
| 29 Jul 2025 | -3.5% |
| 29 Apr 2025 | +5.5% |
| 29 Jan 2025 | +0.8% |
| 24 Oct 2024 | -3.2% |
First Interstate BancSystem at a glance
First Interstate BancSystem, Inc. functions as the parent company of First Interstate Bank, delivering a comprehensive suite of financial products and services across the United States.
- Market value
- $3.6B
- Sector
- Financial Services
- Industry
- Regional Banks
- Consensus revenue growth, next fiscal year
- -6.7%
- Analysts with estimates
- 6
- Beta to the US market
- 0.86
- First valued by Faircurve
- 11 Jul 2026
How the fair value is worked out: the model prices First Interstate BancSystem on the share price against the net assets on the balance sheet, adjusted for the earnings analysts expect (price to book value), runs 2,000 simulations across its inputs and takes the midpoint. The full method is documented here.
What changed in the latest valuation?
On 26 Sep 2026 the model's fair value for FIBK was $28.59. As of 29 Sep 2026 it is $27.90, a change of -2.4%. The model revalues every stock it covers each week, and again after an earnings report.
Questions about First Interstate BancSystem's valuation
Is First Interstate BancSystem stock undervalued or overvalued?
On Faircurve's model, FIBK reads as Overvalued as of 29 Sep 2026. The model's fair value is $27.90 a share against a last close of $36.00, a gap of -22.5%.
What is FIBK's fair value?
$27.90 a share as of 29 Sep 2026, the midpoint of 2,000 simulations. The model's own 20th to 80th percentile range is $21.66 to $35.28.
What price range does the model give FIBK?
$23.41 to $34.02 over 63 trading days. Ranges built this way held the price 60% of the time across 4,327 past valuations, refreshed 26 Sep 2026.
When does First Interstate BancSystem report earnings next?
The next report is scheduled for 28 Oct 2026. Companies can move their dates.
How much has FIBK moved on past earnings reports?
Across its last 8 reports the median two session move was 2.2%, ignoring direction. The largest was +5.5% around the report of 29 Apr 2025.
How confident is the model in this valuation?
The model's evidence grade for FIBK is high. For banks, insurers and mortgage real estate investment trusts (REITs) the grade looks at how many comparable companies there are and how closely they agree, how wide the range of outcomes is, and whether the model's valuation methods agree with each other. It is not a probability that the fair value is right, or that the price reaches it.