First Interstate BancSystem (FIBK) Options Chain

NASDAQ: FIBKFinanceMajor BanksUSD

34.52-0.42 (-1.20%)

At close: Oct 9, 4:00 PM ET · Delayed 15 min

Expiration date

Expiration: Dec 18, 2026
Days to expiration: 68
Share price: $34.52
Put/call ratio (OI): 0.04
Put/call ratio (volume): 0.06
ATM implied volatility: 37.6%
Expected move: ±$5.61
Open interest (C / P): 110 / 4

FIBK options summary

The FIBK options chain for the December 18, 2026 expiration lists 4 call and 4 put contracts, with 68 days until expiration. Open interest stands at 110 calls and 4 puts, a put/call ratio of 0.04, which is tilted bullish, with calls outnumbering puts. At-the-money implied volatility near the $35.00 strike is 37.6%, which implies the market expects a move of about ±$5.61 (16.2%) in First Interstate BancSystem stock by expiration.

The most open interest sits at the $40.00 call (82 contracts) and the $25.00 put (3 contracts).

Summary generated from market data by MetaCap's automated system. Methodology

FIBK options chain · December 18, 2026

FIBK calls and puts by strike price. Shaded cells are in the money.
Calls							Puts
OI	Vol	IV	Last	Bid	Ask	Strike	Bid	Ask	Last	IV	Vol	OI
—	—	—	—	—	—	25.00	0.05	0.90	0.50	63.2%	1	3
—	—	—	—	—	—	30.00	0.00	0.00	0.50	6.3%	2	0
FIBK $34.52
26	26	36.2%	2.35	0.65	1.95	35.00	1.45	2.60	1.80	39.1%	2	0
82	32	36.2%	0.35	0.05	0.55	40.00	—	—	—	—	—	—
0	23	12.5%	0.50	0.00	0.00	45.00	5.30	8.00	9.13	—	—	1
2	2	50.7%	0.05	0.00	0.35	50.00	—	—	—	—	—	—

In-the-money callsIn-the-money puts. IV = implied volatility, OI = open interest (contracts). Each contract covers 100 shares. Quotes delayed at least 15 minutes.

Frequently asked questions

What is the FIBK put/call ratio?

For the December 18, 2026 expiration, the FIBK put/call ratio based on open interest is 0.04 (4 puts vs 110 calls), and 0.06 based on today's volume. A ratio above 1 means more puts than calls.

What is FIBK's implied volatility?

At-the-money implied volatility for FIBK options expiring December 18, 2026 is about 37.6%, an annualized estimate of how much the market expects First Interstate BancSystem stock to move.

How many FIBK option expiration dates are there?

FIBK has 4 listed expiration dates, from Oct 16, 2026 to Mar 19, 2027.

What does "in the money" mean?

A call is in the money when the strike price is below the current share price; a put is in the money when the strike is above it. In-the-money contracts have intrinsic value and are shaded in the table.