NWE · NorthWestern Energy Group, Inc.

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$72.86 +0.31 (+0.43%) At close · Jul 24

Market Cap

$4.48B

61.51M

Options Chain

15-min delayed Underlying $72.86 · today Options Calculator

Positioning

Aug 21, 2026 · 25 days to expiry · 22 contracts

Put / call OI

0.80

Balanced positioning

Open interest

contracts outstanding

Volume

traded today

Max pain

$75.00

$2.14 above spot

ATM implied vol

24.5%

market's expected move

Open interest by strike

Calls Puts

Chain

Click any strike for greeks, breakeven and the calculator

Expiry

Aug 21 25d Sep 18 53d Dec 18 144d Mar 19 235d

Calls						Puts
OI	Vol	IV	Δ	Last	Strike	Last	Δ	IV	Vol	OI
0	—	—	—	—		—	—	—	—	0
Call · $45 In the money Last — Breakeven — Implied vol — Delta — Gamma — Theta — Vega — Open interest 0 Model this call Put · $45 Last — Breakeven — Implied vol — Delta — Gamma — Theta — Vega — Open interest 0 Model this put
0	—	—	—	—		—	—	—	—	0
Call · $50 In the money Last — Breakeven — Implied vol — Delta — Gamma — Theta — Vega — Open interest 0 Model this call Put · $50 Last — Breakeven — Implied vol — Delta — Gamma — Theta — Vega — Open interest 0 Model this put
0	—	—	—	—		—	-0.062	74.2%	—	0
Call · $55 In the money Last — Breakeven — Implied vol — Delta — Gamma — Theta — Vega — Open interest 0 Model this call Put · $55 Last — Breakeven — Implied vol 74.2% Delta -0.062 ≈6% ITM Gamma 0.009 Theta -0.034 Vega 0.03 Open interest 0 Model this put
0	—	41.1%	0.968	—		—	-0.081	55.1%	—	0
Call · $60 In the money Last — Breakeven — Implied vol 41.1% Delta 0.968 ≈97% ITM Gamma 0.009 Theta -0.01 Vega 0.017 Open interest 0 Model this call Put · $60 Last — Breakeven — Implied vol 55.1% Delta -0.081 ≈8% ITM Gamma 0.014 Theta -0.031 Vega 0.031 Open interest 0 Model this put
0	—	30.6%	0.926	—		$1.29	-0.121	39%	1	1
Call · $65 In the money Last — Breakeven — Implied vol 30.6% Delta 0.926 ≈93% ITM Gamma 0.024 Theta -0.015 Vega 0.032 Open interest 0 Model this call Put · $65 Last $1.29 Breakeven $63.71 Implied vol 39% Delta -0.121 ≈12% ITM Gamma 0.027 Theta -0.03 Vega 0.033 Open interest 1 Model this put
0	—	24.4%	0.741	—		$1.20	-0.301	31.3%	5	7
Call · $70 In the money Last — Breakeven — Implied vol 24.4% Delta 0.741 ≈74% ITM Gamma 0.069 Theta -0.029 Vega 0.066 Open interest 0 Model this call Put · $70 Last $1.20 Breakeven $68.80 Implied vol 31.3% Delta -0.301 ≈30% ITM Gamma 0.058 Theta -0.041 Vega 0.066 Open interest 7 Model this put
Underlying $72.86
7	5	25%	0.343	$1.00		—	-0.662	24.1%	—	0
Call · $75 Last $1.00 Breakeven $76.00 Implied vol 25% Delta 0.343 ≈34% ITM Gamma 0.077 Theta -0.035 Vega 0.068 Open interest 7 Model this call Put · $75 In the money Last — Breakeven — Implied vol 24.1% Delta -0.662 ≈66% ITM Gamma 0.079 Theta -0.033 Vega 0.068 Open interest 0 Model this put
3	3	31.8%	0.14	$0.30		—	-0.88	28.9%	—	0
Call · $80 Last $0.30 Breakeven $80.30 Implied vol 31.8% Delta 0.14 ≈14% ITM Gamma 0.037 Theta -0.027 Vega 0.036 Open interest 3 Model this call Put · $80 In the money Last — Breakeven — Implied vol 28.9% Delta -0.88 ≈88% ITM Gamma 0.036 Theta -0.021 Vega 0.036 Open interest 0 Model this put
0	—	—	—	—		—	-0.929	38.6%	—	0
Call · $85 Last — Breakeven — Implied vol — Delta — Gamma — Theta — Vega — Open interest 0 Model this call Put · $85 In the money Last — Breakeven — Implied vol 38.6% Delta -0.929 ≈93% ITM Gamma 0.019 Theta -0.019 Vega 0.021 Open interest 0 Model this put
0	—	—	—	—		—	-0.941	48.9%	—	0
Call · $90 Last — Breakeven — Implied vol — Delta — Gamma — Theta — Vega — Open interest 0 Model this call Put · $90 In the money Last — Breakeven — Implied vol 48.9% Delta -0.941 ≈94% ITM Gamma 0.013 Theta -0.02 Vega 0.022 Open interest 0 Model this put
0	—	—	—	—		—	-0.948	58.7%	—	0
Call · $95 Last — Breakeven — Implied vol — Delta — Gamma — Theta — Vega — Open interest 0 Model this call Put · $95 In the money Last — Breakeven — Implied vol 58.7% Delta -0.948 ≈95% ITM Gamma 0.01 Theta -0.022 Vega 0.022 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 1993004 CUSIP 668074305 13F (30d) 73 filings 73 filers Visit website Investor relations