NGS · Natural Gas Services Group Inc

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$35.53 -0.23 (-0.64%) At close · Jul 29

Market Cap

$447.62M

12.60M

Options Chain

15-min delayed Underlying $35.53 · at close Jul 29, 2026 Options Calculator

Positioning

Aug 21, 2026 · 22 days to expiry · 20 contracts

Put / call OI

0.38

Call-heavy positioning

Open interest

contracts outstanding

Volume

traded today

Max pain

$37.50

$1.97 above spot

ATM implied vol

60.8%

market's expected move

Open interest by strike

Calls Puts

32.5

37.5

42.5

47.5

52.5

Chain

Click any strike for greeks, breakeven and the calculator

Expiry

Aug 21 22d Sep 18 50d Oct 16 78d Jan 15 169d

Calls						Puts
OI	Vol	IV	Δ	Last	Strike	Last	Δ	IV	Vol	OI
0	—	74.5%	0.842	—		—	—	—	—	0
Call · $30 In the money Last — Breakeven — Implied vol 74.5% Delta 0.842 ≈84% ITM Gamma 0.037 Theta -0.036 Vega 0.021 Open interest 0 Model this call Put · $30 Last — Breakeven — Implied vol — Delta — Gamma — Theta — Vega — Open interest 0 Model this put
0	—	64.5%	0.738	—		—	-0.198	45.9%	—	0
Call · $32.5 In the money Last — Breakeven — Implied vol 64.5% Delta 0.738 ≈74% ITM Gamma 0.057 Theta -0.042 Vega 0.029 Open interest 0 Model this call Put · $32.5 Last — Breakeven — Implied vol 45.9% Delta -0.198 ≈20% ITM Gamma 0.07 Theta -0.025 Vega 0.022 Open interest 0 Model this put
4	3	62.8%	0.571	$2.53		—	-0.429	58.7%	—	0
Call · $35 In the money Last $2.53 Breakeven $37.53 Implied vol 62.8% Delta 0.571 ≈57% ITM Gamma 0.071 Theta -0.05 Vega 0.035 Open interest 4 Model this call Put · $35 Last — Breakeven — Implied vol 58.7% Delta -0.429 ≈43% ITM Gamma 0.077 Theta -0.044 Vega 0.035 Open interest 0 Model this put
Underlying $35.53
6	1	52.9%	0.367	$1.80		$0.60	-0.619	57.9%	3	3
Call · $37.5 Last $1.80 Breakeven $39.30 Implied vol 52.9% Delta 0.367 ≈37% ITM Gamma 0.082 Theta -0.04 Vega 0.032 Open interest 6 Model this call Put · $37.5 In the money Last $0.60 Breakeven $36.90 Implied vol 57.9% Delta -0.619 ≈62% ITM Gamma 0.076 Theta -0.042 Vega 0.032 Open interest 3 Model this put
4	2	59.3%	0.234	$1.00		$3.05	-0.799	52.6%	7	9
Call · $40 Last $1.00 Breakeven $41.00 Implied vol 59.3% Delta 0.234 ≈23% ITM Gamma 0.059 Theta -0.036 Vega 0.025 Open interest 4 Model this call Put · $40 In the money Last $3.05 Breakeven $36.95 Implied vol 52.6% Delta -0.799 ≈80% ITM Gamma 0.062 Theta -0.027 Vega 0.025 Open interest 9 Model this put
16	2	79.1%	0.211	$0.45		—	-0.878	58.5%	—	0
Call · $42.5 Last $0.45 Breakeven $42.95 Implied vol 79.1% Delta 0.211 ≈21% ITM Gamma 0.041 Theta -0.045 Vega 0.026 Open interest 16 Model this call Put · $42.5 In the money Last — Breakeven — Implied vol 58.5% Delta -0.878 ≈88% ITM Gamma 0.041 Theta -0.021 Vega 0.017 Open interest 0 Model this put
2	1	83.5%	0.149	$0.40		—	-0.956	55.3%	—	0
Call · $45 Last $0.40 Breakeven $45.40 Implied vol 83.5% Delta 0.149 ≈15% ITM Gamma 0.032 Theta -0.039 Vega 0.018 Open interest 2 Model this call Put · $45 In the money Last — Breakeven — Implied vol 55.3% Delta -0.956 ≈96% ITM Gamma 0.022 Theta -0.008 Vega 0.009 Open interest 0 Model this put
0	—	89.5%	0.118	—		—	-0.962	65.7%	—	0
Call · $47.5 Last — Breakeven — Implied vol 89.5% Delta 0.118 ≈12% ITM Gamma 0.025 Theta -0.035 Vega 0.018 Open interest 0 Model this call Put · $47.5 In the money Last — Breakeven — Implied vol 65.7% Delta -0.962 ≈96% ITM Gamma 0.017 Theta -0.009 Vega 0.009 Open interest 0 Model this put
0	—	100.7%	0.108	—		—	—	—	—	0
Call · $50 Last — Breakeven — Implied vol 100.7% Delta 0.108 ≈11% ITM Gamma 0.021 Theta -0.037 Vega 0.019 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	—	111.3%	0.1	—		—	—	—	—	0
Call · $52.5 Last — Breakeven — Implied vol 111.3% Delta 0.1 ≈10% ITM Gamma 0.018 Theta -0.039 Vega 0.019 Open interest 0 Model this call Put · $52.5 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 1084991 CUSIP 63886Q109 13F (30d) 20 filings 20 filers Visit website Investor relations