FIBK · First Interstate Bancsystem Inc

Track FIBK — free Ask ALVIS about FIBK

$37.75 -0.34 (-0.89%)

Market Cap

$3.70B

97.14M

Options Chain

15-min delayed Underlying $37.75 · today Options Calculator

Positioning

Aug 21, 2026 · 23 days to expiry · 18 contracts

Put / call OI

0.02

Call-heavy positioning

Open interest

contracts outstanding

Volume

traded today

Max pain

$20.00

$17.75 below spot

ATM implied vol

39.4%

market's expected move

Open interest by strike

Calls Puts

22.5

Chain

Click any strike for greeks, breakeven and the calculator

Expiry

Aug 21 23d Sep 18 51d Dec 18 142d Mar 19 233d

Calls						Puts
OI	Vol	IV	Δ	Last	Strike	Last	Δ	IV	Vol	OI
7	4	203.9%	0.927	$16.80		—	—	—	—	0
Call · $20 In the money Last $16.80 Breakeven $36.80 Implied vol 203.9% Delta 0.927 ≈93% ITM Gamma 0.007 Theta -0.054 Vega 0.012 Open interest 7 Model this call Put · $20 Last — Breakeven — Implied vol — Delta — Gamma — Theta — Vega — Open interest 0 Model this put
0	—	172.9%	0.914	—		—	—	—	—	0
Call · $22.5 In the money Last — Breakeven — Implied vol 172.9% Delta 0.914 ≈91% ITM Gamma 0.01 Theta -0.052 Vega 0.012 Open interest 0 Model this call Put · $22.5 Last — Breakeven — Implied vol — Delta — Gamma — Theta — Vega — Open interest 0 Model this put
0	—	144.5%	0.898	—		—	—	—	—	0
Call · $25 In the money Last — Breakeven — Implied vol 144.5% Delta 0.898 ≈90% ITM Gamma 0.014 Theta -0.05 Vega 0.019 Open interest 0 Model this call Put · $25 Last — Breakeven — Implied vol — Delta — Gamma — Theta — Vega — Open interest 0 Model this put
0	—	93.4%	0.842	—		—	-0.117	77.1%	—	0
Call · $30 In the money Last — Breakeven — Implied vol 93.4% Delta 0.842 ≈84% ITM Gamma 0.028 Theta -0.043 Vega 0.022 Open interest 0 Model this call Put · $30 Last — Breakeven — Implied vol 77.1% Delta -0.117 ≈12% ITM Gamma 0.028 Theta -0.031 Vega 0.022 Open interest 0 Model this put
6	1	47.2%	0.697	$4.75		$0.60	-0.254	35%	1	1
Call · $35 In the money Last $4.75 Breakeven $39.75 Implied vol 47.2% Delta 0.697 ≈70% ITM Gamma 0.081 Theta -0.032 Vega 0.031 Open interest 6 Model this call Put · $35 Last $0.60 Breakeven $34.40 Implied vol 35% Delta -0.254 ≈25% ITM Gamma 0.099 Theta -0.023 Vega 0.032 Open interest 1 Model this put
Underlying $37.75
45	1	39.4%	0.223	$0.60		—	—	—	—	0
Call · $40 Last $0.60 Breakeven $40.60 Implied vol 39.4% Delta 0.223 ≈22% ITM Gamma 0.083 Theta -0.023 Vega 0.025 Open interest 45 Model this call Put · $40 In the money Last — Breakeven — Implied vol — Delta — Gamma — Theta — Vega — Open interest 0 Model this put
5	5	61.3%	0.113	$0.05		—	—	—	—	0
Call · $45 Last $0.05 Breakeven $45.05 Implied vol 61.3% Delta 0.113 ≈11% ITM Gamma 0.034 Theta -0.024 Vega 0.018 Open interest 5 Model this call Put · $45 In the money Last — Breakeven — Implied vol — Delta — Gamma — Theta — Vega — Open interest 0 Model this put
0	—	—	—	—		—	—	—	—	0
Call · $50 Last — Breakeven — Implied vol — Delta — Gamma — Theta — Vega — Open interest 0 Model this call Put · $50 In the money Last — Breakeven — Implied vol — Delta — Gamma — Theta — Vega — Open interest 0 Model this put
0	—	—	—	—		—	—	—	—	0
Call · $55 Last — Breakeven — Implied vol — Delta — Gamma — Theta — Vega — Open interest 0 Model this call Put · $55 In the money Last — Breakeven — Implied vol — Delta — Gamma — Theta — Vega — Open interest 0 Model this put

About this data

Greeks, implied volatility, open interest and the last price come from the latest daily snapshot and are 15-minute delayed. Bid and ask are not included on this plan.

In-the-money strikes are tinted, deepening toward the money, and the bar beside each open-interest figure scales to the heaviest strike shown. Max pain is the listed strike where the most open interest would expire worthless — a positioning reference, not a forecast.

Key facts CIK 860413 CUSIP 32055Y201 13F (30d) 61 filings 60 filers Visit website Investor relations