COLB · Columbia Banking System, Inc.

Track COLB — free Ask ALVIS about COLB

$31.17 +0.14 (+0.45%)

Market Cap

$8.78B

282.90M

Options Chain

15-min delayed Underlying $31.17 · today Options Calculator

Positioning

Aug 21, 2026 · 14 days to expiry · 16 contracts

Put / call OI

0.32

Call-heavy positioning

Open interest

2,789

contracts outstanding

Volume

traded today

Max pain

$30.00

$1.17 below spot

ATM implied vol

29.3%

market's expected move

Open interest by strike

Calls Puts

17.5

22.5

Chain

Click any strike for greeks, breakeven and the calculator

Expiry

Aug 21 14d Sep 18 42d Nov 20 105d Feb 19 196d

Calls						Puts
OI	Vol	IV	Δ	Last	Strike	Last	Δ	IV	Vol	OI
0	12	—	—	$16.00		—	—	—	—	0
Call · $15 In the money Last $16.00 Breakeven $31.00 Implied vol — Delta — Gamma — Theta — Vega — Open interest 0 Model this call Put · $15 Last — Breakeven — Implied vol — Delta — Gamma — Theta — Vega — Open interest 0 Model this put
0	2	—	—	$11.54		$0.15	-0.034	178.5%	1	9
Call · $17.5 In the money Last $11.54 Breakeven $29.04 Implied vol — Delta — Gamma — Theta — Vega — Open interest 0 Model this call Put · $17.5 Last $0.15 Breakeven $17.35 Implied vol 178.5% Delta -0.034 ≈3% ITM Gamma 0.007 Theta -0.029 Vega 0.005 Open interest 9 Model this put
1	1	132.6%	0.967	$11.54		$0.50	—	—	2	8
Call · $20 In the money Last $11.54 Breakeven $31.54 Implied vol 132.6% Delta 0.967 ≈97% ITM Gamma 0.009 Theta -0.02 Vega 0.005 Open interest 1 Model this call Put · $20 Last $0.50 Breakeven $19.50 Implied vol — Delta — Gamma — Theta — Vega — Open interest 8 Model this put
2	1	—	—	$7.50		$0.10	-0.086	134.5%	10	2
Call · $22.5 In the money Last $7.50 Breakeven $30.00 Implied vol — Delta — Gamma — Theta — Vega — Open interest 2 Model this call Put · $22.5 Last $0.10 Breakeven $22.40 Implied vol 134.5% Delta -0.086 ≈9% ITM Gamma 0.019 Theta -0.046 Vega 0.009 Open interest 2 Model this put
72	2	—	—	$6.20		$0.10	-0.112	102%	3	205
Call · $25 In the money Last $6.20 Breakeven $31.20 Implied vol — Delta — Gamma — Theta — Vega — Open interest 72 Model this call Put · $25 Last $0.10 Breakeven $24.90 Implied vol 102% Delta -0.112 ≈11% ITM Gamma 0.031 Theta -0.043 Vega 0.01 Open interest 205 Model this put
370	1	20.6%	0.835	$1.45		$0.25	-0.29	38%	10	426
Call · $30 In the money Last $1.45 Breakeven $31.45 Implied vol 20.6% Delta 0.835 ≈84% ITM Gamma 0.199 Theta -0.01 Vega 0.016 Open interest 370 Model this call Put · $30 Last $0.25 Breakeven $29.75 Implied vol 38% Delta -0.29 ≈29% ITM Gamma 0.147 Theta -0.029 Vega 0.021 Open interest 426 Model this put
Underlying $31.17
1.5k	21	44%	0.099	$0.10		$3.50	-0.836	56.5%	1	34
Call · $35 Last $0.10 Breakeven $35.10 Implied vol 44% Delta 0.099 ≈10% ITM Gamma 0.064 Theta -0.016 Vega 0.011 Open interest 1.5k Model this call Put · $35 In the money Last $3.50 Breakeven $31.50 Implied vol 56.5% Delta -0.836 ≈84% ITM Gamma 0.071 Theta -0.031 Vega 0.017 Open interest 34 Model this put
117	1	—	—	$0.10		$7.50	-0.848	111.7%	17	0
Call · $40 Last $0.10 Breakeven $40.10 Implied vol — Delta — Gamma — Theta — Vega — Open interest 117 Model this call Put · $40 In the money Last $7.50 Breakeven $32.50 Implied vol 111.7% Delta -0.848 ≈85% ITM Gamma 0.035 Theta -0.057 Vega 0.012 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 887343 CUSIP 197236102 13F (30d) 255 filings 242 filers Visit website Investor relations