NWE · NorthWestern Energy Group, Inc. · Options Chain

Track NWE — free

$70.57 -1.21 (-1.69%) At close · Sep 9

S&P 400 member Russell 2000 member Rebalance outlook locked

Market Cap

$4.34B

61.52M

Options Chain

Underlying $70.57 · at close Sep 9, 2026 Options Calculator

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Positioning

Sep 18, 2026 · 8 days to expiry · 26 contracts · mixed daily-bar sessions · Mar 12, 2026–Sep 9, 2026; 15 unknown

Put / call OI

0.28

Call-heavy positioning

Open interest

134

as of Sep 8, 2026

Volume

—

dated and unknown daily-bar sessions

Max pain

$70.00

$0.57 below spot

ATM implied vol

26.8%

market's expected move

Open interest by strike

Calls Puts

100

Chain

Click any strike for greeks, breakeven and the calculator

Expiry

Sep 18 8d Oct 16 36d Dec 18 99d Mar 19 190d

Calls								Puts
OI	Vol	IV	Δ	Bid	Ask	Last	Strike	Last	Bid	Ask	Δ	IV	Vol	OI
—	3	—	—	$29.00	$32.80	$33.50		—	$0.00	$3.40	—	—	—	—
Call · $40 In the money Daily-bar session Jun 26, 2026 Quote as of 2026-09-09 19:55:05.955 UTC Last $33.50 Breakeven $73.50 Implied vol — Delta — Gamma — Theta — Vega — Open interest — OI effective date — Model this call Put · $40 Daily-bar session Unknown Quote as of 2026-09-09 19:46:26.230 UTC Last — Breakeven — Implied vol — Delta — Gamma — Theta — Vega — Open interest — OI effective date — Model this put
—	—	—	—	$24.00	$27.80	—		$0.50	$0.00	$3.40	—	—	5	5
Call · $45 In the money Daily-bar session Unknown Quote as of 2026-09-09 19:55:05.954 UTC Last — Breakeven — Implied vol — Delta — Gamma — Theta — Vega — Open interest — OI effective date — Model this call Put · $45 Daily-bar session Mar 24, 2026 Quote as of 2026-09-09 19:46:26.230 UTC Last $0.50 Breakeven $44.50 Implied vol — Delta — Gamma — Theta — Vega — Open interest 5 OI effective date Sep 8, 2026 Model this put
—	—	—	—	$18.50	$22.80	—		$0.79	$0.00	$3.40	—	—	1	1
Call · $50 In the money Daily-bar session Unknown Quote as of 2026-09-09 19:57:27.678 UTC Last — Breakeven — Implied vol — Delta — Gamma — Theta — Vega — Open interest — OI effective date — Model this call Put · $50 Daily-bar session Mar 12, 2026 Quote as of 2026-09-09 19:46:26.230 UTC Last $0.79 Breakeven $49.21 Implied vol — Delta — Gamma — Theta — Vega — Open interest 1 OI effective date Sep 8, 2026 Model this put
—	2	77%	0.988	$13.50	$17.80	$15.76		—	$0.00	$1.05	—	—	—	—
Call · $55 In the money Daily-bar session Jun 12, 2026 Quote as of 2026-09-09 19:55:05.955 UTC Last $15.76 Breakeven $70.76 Implied vol 77% Delta 0.988 ≈99% ITM Gamma 0.004 Theta -0.021 Vega 0.003 Open interest — OI effective date — Model this call Put · $55 Daily-bar session Unknown Quote as of 2026-09-09 19:58:30.115 UTC Last — Breakeven — Implied vol — Delta — Gamma — Theta — Vega — Open interest — OI effective date — Model this put
—	—	52.1%	0.984	$8.50	$12.80	—		$0.10	$0.00	$2.90	—	—	3	4
Call · $60 In the money Daily-bar session Unknown Quote as of 2026-09-09 19:57:33.679 UTC Last — Breakeven — Implied vol 52.1% Delta 0.984 ≈98% ITM Gamma 0.007 Theta -0.019 Vega 0.004 Open interest — OI effective date — Model this call Put · $60 Daily-bar session Aug 7, 2026 Quote as of 2026-09-09 13:30:02.890 UTC Last $0.10 Breakeven $59.90 Implied vol — Delta — Gamma — Theta — Vega — Open interest 4 OI effective date Sep 8, 2026 Model this put
—	—	44.8%	0.9	$3.70	$8.00	—		$0.20	$0.00	$0.50	—	—	1	12
Call · $65 In the money Daily-bar session Unknown Quote as of 2026-09-09 19:55:42.178 UTC Last — Breakeven — Implied vol 44.8% Delta 0.9 ≈90% ITM Gamma 0.037 Theta -0.057 Vega 0.018 Open interest — OI effective date — Model this call Put · $65 Daily-bar session Aug 26, 2026 Quote as of 2026-09-09 13:50:37.771 UTC Last $0.20 Breakeven $64.80 Implied vol — Delta — Gamma — Theta — Vega — Open interest 12 OI effective date Sep 8, 2026 Model this put
26	5	—	—	$0.00	$4.40	$2.50		$2.55	$0.00	$4.10	—	—	4	7
Call · $70 In the money Daily-bar session Aug 26, 2026 Quote as of 2026-09-09 19:59:59.982 UTC Last $2.50 Breakeven $72.50 Implied vol — Delta — Gamma — Theta — Vega — Open interest 26 OI effective date Sep 8, 2026 Model this call Put · $70 Daily-bar session Jul 29, 2026 Quote as of 2026-09-09 19:59:59.982 UTC Last $2.55 Breakeven $67.45 Implied vol — Delta — Gamma — Theta — Vega — Open interest 7 OI effective date Sep 8, 2026 Model this put
Underlying $70.57
48	8	—	—	$0.00	$0.75	$0.10		—	$2.30	$6.60	-0.933	26.8%	—	—
Call · $75 Daily-bar session Sep 9, 2026 Quote as of 2026-09-09 13:30:09.472 UTC Last $0.10 Breakeven $75.10 Implied vol — Delta — Gamma — Theta — Vega — Open interest 48 OI effective date Sep 8, 2026 Model this call Put · $75 In the money Daily-bar session Unknown Quote as of 2026-09-09 19:55:28.149 UTC Last — Breakeven — Implied vol 26.8% Delta -0.933 ≈93% ITM Gamma 0.047 Theta -0.016 Vega 0.014 Open interest — OI effective date — Model this put
31	18	—	—	$0.00	$0.30	$0.05		$9.60	$7.30	$11.60	-0.957	48%	1	—
Call · $80 Daily-bar session Aug 28, 2026 Quote as of 2026-09-09 19:57:28.635 UTC Last $0.05 Breakeven $80.05 Implied vol — Delta — Gamma — Theta — Vega — Open interest 31 OI effective date Sep 8, 2026 Model this call Put · $80 In the money Daily-bar session Apr 21, 2026 Quote as of 2026-09-09 19:58:46.044 UTC Last $9.60 Breakeven $70.40 Implied vol 48% Delta -0.957 ≈96% ITM Gamma 0.018 Theta -0.021 Vega 0.01 Open interest — OI effective date — Model this put
—	—	—	—	$0.00	$3.40	—		—	$12.30	$16.60	-0.966	66.6%	—	—
Call · $85 Daily-bar session Unknown Quote as of 2026-09-09 19:46:26.230 UTC Last — Breakeven — Implied vol — Delta — Gamma — Theta — Vega — Open interest — OI effective date — Model this call Put · $85 In the money Daily-bar session Unknown Quote as of 2026-09-09 19:55:05.886 UTC Last — Breakeven — Implied vol 66.6% Delta -0.966 ≈97% ITM Gamma 0.011 Theta -0.024 Vega 0.008 Open interest — OI effective date — Model this put
—	—	—	—	$0.00	$3.40	—		—	$17.30	$21.10	—	—	—	—
Call · $90 Daily-bar session Unknown Quote as of 2026-09-09 19:46:26.230 UTC Last — Breakeven — Implied vol — Delta — Gamma — Theta — Vega — Open interest — OI effective date — Model this call Put · $90 In the money Daily-bar session Unknown Quote as of 2026-09-09 19:55:05.886 UTC Last — Breakeven — Implied vol — Delta — Gamma — Theta — Vega — Open interest — OI effective date — Model this put
—	—	—	—	$0.00	$3.40	—		—	$22.30	$26.10	—	—	—	—
Call · $95 Daily-bar session Unknown Quote as of 2026-09-09 19:46:26.230 UTC Last — Breakeven — Implied vol — Delta — Gamma — Theta — Vega — Open interest — OI effective date — Model this call Put · $95 In the money Daily-bar session Unknown Quote as of 2026-09-09 19:55:05.886 UTC Last — Breakeven — Implied vol — Delta — Gamma — Theta — Vega — Open interest — OI effective date — Model this put
—	—	—	—	$0.00	$3.40	—		—	$27.30	$31.10	—	—	—	—
Call · $100 Daily-bar session Unknown Quote as of 2026-09-09 19:46:26.230 UTC Last — Breakeven — Implied vol — Delta — Gamma — Theta — Vega — Open interest — OI effective date — Model this call Put · $100 In the money Daily-bar session Unknown Quote as of 2026-09-09 19:55:05.886 UTC Last — Breakeven — Implied vol — Delta — Gamma — Theta — Vega — Open interest — OI effective date — Model this put

About this data

Each contract's last price, day range and volume belong to the daily-bar session shown in its details; unknown means the source omitted that timestamp. Open interest has its own effective date shown separately; implied volatility and greeks are model values computed when fetched. This chain has mixed daily-bar sessions · Mar 12, 2026–Sep 9, 2026; 15 unknown. Positioning totals are shown only when every returned open-interest value has the same known effective date. Bid and ask are real-time consolidated OPRA readings.

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) 209 filings 207 filers Visit website Investor relations