OTTR · Otter Tail Corp

Track OTTR — free

$92.87 +0.00 (+0.00%) At close · Aug 14

Market Cap

$3.90B

41.99M

Options Chain

Underlying $92.87 · at close Aug 14, 2026 Options Calculator

Positioning

Aug 21, 2026 · 4 days to expiry · 38 contracts · mixed snapshot sessions · Jun 25, 2026–Aug 11, 2026; 26 unknown

Put / call OI

—

dated and unknown snapshot sessions

Open interest

—

dated and unknown snapshot sessions

Volume

—

dated and unknown snapshot sessions

Chain

Click any strike for greeks, breakeven and the calculator

Expiry

Aug 21 4d Sep 18 32d Oct 16 60d Jan 15 151d

Calls						Puts
OI	Vol	IV	Δ	Last	Strike	Last	Δ	IV	Vol	OI
0	1	295.8%	0.992	$51.79		—	—	—	—	0
Call · $45 In the money Snapshot session Aug 11, 2026 Last $51.79 Breakeven $96.79 Implied vol 295.8% Delta 0.992 ≈99% ITM Gamma 0.001 Theta -0.07 Vega 0.002 Open interest 0 Model this call Put · $45 Snapshot session Unknown Last — Breakeven — Implied vol — Delta — Gamma — Theta — Vega — Open interest 0 Model this put
0	—	255.7%	0.991	—		—	—	—	—	0
Call · $50 In the money Snapshot session Unknown Last — Breakeven — Implied vol 255.7% Delta 0.991 ≈99% ITM Gamma 0.001 Theta -0.068 Vega 0.004 Open interest 0 Model this call Put · $50 Snapshot session Unknown Last — Breakeven — Implied vol — Delta — Gamma — Theta — Vega — Open interest 0 Model this put
0	—	218.5%	0.99	—		$1.93	—	—	1	1
Call · $55 In the money Snapshot session Unknown Last — Breakeven — Implied vol 218.5% Delta 0.99 ≈99% ITM Gamma 0.001 Theta -0.065 Vega 0.004 Open interest 0 Model this call Put · $55 Snapshot session Jun 25, 2026 Last $1.93 Breakeven $53.07 Implied vol — Delta — Gamma — Theta — Vega — Open interest 1 Model this put
0	—	184.5%	0.988	—		—	—	—	—	0
Call · $60 In the money Snapshot session Unknown Last — Breakeven — Implied vol 184.5% Delta 0.988 ≈99% ITM Gamma 0.002 Theta -0.063 Vega 0.004 Open interest 0 Model this call Put · $60 Snapshot session Unknown Last — Breakeven — Implied vol — Delta — Gamma — Theta — Vega — Open interest 0 Model this put
0	—	153.3%	0.986	—		—	—	—	—	0
Call · $65 In the money Snapshot session Unknown Last — Breakeven — Implied vol 153.3% Delta 0.986 ≈99% ITM Gamma 0.002 Theta -0.06 Vega 0.004 Open interest 0 Model this call Put · $65 Snapshot session Unknown Last — Breakeven — Implied vol — Delta — Gamma — Theta — Vega — Open interest 0 Model this put
0	—	124.4%	0.983	—		$0.15	-0.053	169.7%	1	0
Call · $70 In the money Snapshot session Unknown Last — Breakeven — Implied vol 124.4% Delta 0.983 ≈98% ITM Gamma 0.003 Theta -0.058 Vega 0.005 Open interest 0 Model this call Put · $70 Snapshot session Jul 29, 2026 Last $0.15 Breakeven $69.85 Implied vol 169.7% Delta -0.053 ≈5% ITM Gamma 0.006 Theta -0.213 Vega 0.009 Open interest 0 Model this put
0	—	85.7%	0.99	—		—	-0.065	135.4%	—	0
Call · $75 In the money Snapshot session Unknown Last — Breakeven — Implied vol 85.7% Delta 0.99 ≈99% ITM Gamma 0.003 Theta -0.025 Vega 0.002 Open interest 0 Model this call Put · $75 Snapshot session Unknown Last — Breakeven — Implied vol 135.4% Delta -0.065 ≈6% ITM Gamma 0.009 Theta -0.198 Vega 0.016 Open interest 0 Model this put
0	—	—	—	—		$2.87	-0.067	94.1%	1	1
Call · $80 In the money Snapshot session Unknown Last — Breakeven — Implied vol — Delta — Gamma — Theta — Vega — Open interest 0 Model this call Put · $80 Snapshot session Jun 25, 2026 Last $2.87 Breakeven $77.13 Implied vol 94.1% Delta -0.067 ≈7% ITM Gamma 0.014 Theta -0.141 Vega 0.017 Open interest 1 Model this put
0	3	38.6%	0.982	$8.28		$1.20	-0.116	69.8%	1	17
Call · $85 In the money Snapshot session Jul 24, 2026 Last $8.28 Breakeven $93.28 Implied vol 38.6% Delta 0.982 ≈98% ITM Gamma 0.011 Theta -0.02 Vega 0.005 Open interest 0 Model this call Put · $85 Snapshot session Jul 31, 2026 Last $1.20 Breakeven $83.80 Implied vol 69.8% Delta -0.116 ≈12% ITM Gamma 0.028 Theta -0.159 Vega 0.017 Open interest 17 Model this put
21	3	53.8%	0.71	$3.89		$1.15	-0.277	50.3%	1	11
Call · $90 In the money Snapshot session Aug 10, 2026 Last $3.89 Breakeven $93.89 Implied vol 53.8% Delta 0.71 ≈71% ITM Gamma 0.062 Theta -0.213 Vega 0.035 Open interest 21 Model this call Put · $90 Snapshot session Aug 6, 2026 Last $1.15 Breakeven $88.85 Implied vol 50.3% Delta -0.277 ≈28% ITM Gamma 0.065 Theta -0.194 Vega 0.035 Open interest 11 Model this put
Underlying $92.87
19	1	29%	0.244	$0.60		—	-0.769	27.5%	—	0
Call · $95 Snapshot session Aug 5, 2026 Last $0.60 Breakeven $95.60 Implied vol 29% Delta 0.244 ≈24% ITM Gamma 0.107 Theta -0.106 Vega 0.036 Open interest 19 Model this call Put · $95 In the money Snapshot session Unknown Last — Breakeven — Implied vol 27.5% Delta -0.769 ≈77% ITM Gamma 0.11 Theta -0.097 Vega 0.028 Open interest 0 Model this put
55	50	60.3%	0.138	$0.50		—	-0.92	47.2%	—	0
Call · $100 Snapshot session Jul 20, 2026 Last $0.50 Breakeven $100.50 Implied vol 60.3% Delta 0.138 ≈14% ITM Gamma 0.036 Theta -0.156 Vega 0.019 Open interest 55 Model this call Put · $100 In the money Snapshot session Unknown Last — Breakeven — Implied vol 47.2% Delta -0.92 ≈92% ITM Gamma 0.031 Theta -0.08 Vega 0.019 Open interest 0 Model this put
10	10	84.7%	0.104	$0.48		—	-0.954	64.8%	—	0
Call · $105 Snapshot session Jul 17, 2026 Last $0.48 Breakeven $105.48 Implied vol 84.7% Delta 0.104 ≈10% ITM Gamma 0.021 Theta -0.176 Vega 0.019 Open interest 10 Model this call Put · $105 In the money Snapshot session Unknown Last — Breakeven — Implied vol 64.8% Delta -0.954 ≈95% ITM Gamma 0.015 Theta -0.07 Vega 0.011 Open interest 0 Model this put
1	1	108.1%	0.086	$0.10		—	-0.943	93.7%	—	0
Call · $110 Snapshot session Jul 20, 2026 Last $0.10 Breakeven $110.10 Implied vol 108.1% Delta 0.086 ≈9% ITM Gamma 0.014 Theta -0.196 Vega 0.02 Open interest 1 Model this call Put · $110 In the money Snapshot session Unknown Last — Breakeven — Implied vol 93.7% Delta -0.943 ≈94% ITM Gamma 0.012 Theta -0.12 Vega 0.011 Open interest 0 Model this put
0	—	—	—	—		—	-0.959	108.4%	—	0
Call · $115 Snapshot session Unknown Last — Breakeven — Implied vol — Delta — Gamma — Theta — Vega — Open interest 0 Model this call Put · $115 In the money Snapshot session Unknown Last — Breakeven — Implied vol 108.4% Delta -0.959 ≈96% ITM Gamma 0.008 Theta -0.106 Vega 0.012 Open interest 0 Model this put
0	—	—	—	—		—	-0.964	126.6%	—	0
Call · $120 Snapshot session Unknown Last — Breakeven — Implied vol — Delta — Gamma — Theta — Vega — Open interest 0 Model this call Put · $120 In the money Snapshot session Unknown Last — Breakeven — Implied vol 126.6% Delta -0.964 ≈96% ITM Gamma 0.006 Theta -0.113 Vega 0.011 Open interest 0 Model this put
0	—	—	—	—		—	-0.967	141.8%	—	0
Call · $125 Snapshot session Unknown Last — Breakeven — Implied vol — Delta — Gamma — Theta — Vega — Open interest 0 Model this call Put · $125 In the money Snapshot session Unknown Last — Breakeven — Implied vol 141.8% Delta -0.967 ≈97% ITM Gamma 0.005 Theta -0.116 Vega 0.006 Open interest 0 Model this put
0	—	—	—	—		—	-0.977	148.1%	—	0
Call · $130 Snapshot session Unknown Last — Breakeven — Implied vol — Delta — Gamma — Theta — Vega — Open interest 0 Model this call Put · $130 In the money Snapshot session Unknown Last — Breakeven — Implied vol 148.1% Delta -0.977 ≈98% ITM Gamma 0.004 Theta -0.09 Vega 0.006 Open interest 0 Model this put
0	—	—	—	—		—	-0.961	185.3%	—	0
Call · $135 Snapshot session Unknown Last — Breakeven — Implied vol — Delta — Gamma — Theta — Vega — Open interest 0 Model this call Put · $135 In the money Snapshot session Unknown Last — Breakeven — Implied vol 185.3% Delta -0.961 ≈96% ITM Gamma 0.005 Theta -0.178 Vega 0.012 Open interest 0 Model this put

About this data

Each contract's last price, volume, greeks, implied volatility and open interest belongs to the snapshot session shown in its details; unknown means the provider omitted the timestamp. This chain has mixed snapshot sessions · Jun 25, 2026–Aug 11, 2026; 26 unknown. Cross-contract positioning totals are shown only when every returned row has the same known session. 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.

Key facts CIK 1466593 CUSIP 689648103 13F (30d) 337 filings 318 filers Visit website Investor relations