AMPH · Amphastar Pharmaceuticals, Inc.

Track AMPH — free

$20.91 +0.73 (+3.62%) At close · Aug 14

Market Cap

$889.47M

42.54M

Options Chain

Underlying $20.91 · at close Aug 14, 2026 Options Calculator

Positioning

Aug 21, 2026 · 5 days to expiry · 26 contracts · mixed snapshot sessions · Jun 26, 2026–Aug 14, 2026; 15 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 5d Sep 18 33d Dec 18 124d Mar 19 215d

Calls						Puts
OI	Vol	IV	Δ	Last	Strike	Last	Δ	IV	Vol	OI
0	—	817.6%	0.996	—		—	—	—	—	0
Call · $2.5 In the money Snapshot session Unknown Last — Breakeven — Implied vol 817.6% Delta 0.996 ≈100% ITM Gamma 0.001 Theta -0.023 Vega 0 Open interest 0 Model this call Put · $2.5 Snapshot session Unknown Last — Breakeven — Implied vol — Delta — Gamma — Theta — Vega — Open interest 0 Model this put
0	—	548%	0.994	—		$0.10	—	—	14	26
Call · $5 In the money Snapshot session Unknown Last — Breakeven — Implied vol 548% Delta 0.994 ≈99% ITM Gamma 0.001 Theta -0.023 Vega 0.001 Open interest 0 Model this call Put · $5 Snapshot session Jul 24, 2026 Last $0.10 Breakeven $4.90 Implied vol — Delta — Gamma — Theta — Vega — Open interest 26 Model this put
0	—	459.3%	0.984	—		$0.05	-0.067	872.4%	11	11
Call · $7.5 In the money Snapshot session Unknown Last — Breakeven — Implied vol 459.3% Delta 0.984 ≈98% ITM Gamma 0.003 Theta -0.045 Vega 0.002 Open interest 0 Model this call Put · $7.5 Snapshot session Jul 24, 2026 Last $0.05 Breakeven $7.45 Implied vol 872.4% Delta -0.067 ≈7% ITM Gamma 0.006 Theta -0.268 Vega 0.004 Open interest 11 Model this put
0	—	289.8%	0.988	—		$0.05	-0.111	958.6%	41	71
Call · $10 In the money Snapshot session Unknown Last — Breakeven — Implied vol 289.8% Delta 0.988 ≈99% ITM Gamma 0.004 Theta -0.021 Vega 0.001 Open interest 0 Model this call Put · $10 Snapshot session Jul 27, 2026 Last $0.05 Breakeven $9.95 Implied vol 958.6% Delta -0.111 ≈11% ITM Gamma 0.008 Theta -0.43 Vega 0.005 Open interest 71 Model this put
0	—	208.2%	0.984	—		—	-0.13	521.3%	—	0
Call · $12.5 In the money Snapshot session Unknown Last — Breakeven — Implied vol 208.2% Delta 0.984 ≈98% ITM Gamma 0.007 Theta -0.02 Vega 0.001 Open interest 0 Model this call Put · $12.5 Snapshot session Unknown Last — Breakeven — Implied vol 521.3% Delta -0.13 ≈13% ITM Gamma 0.016 Theta -0.26 Vega 0.005 Open interest 0 Model this put
0	—	188.1%	0.942	—		$0.15	-0.074	206%	3	2
Call · $15 In the money Snapshot session Unknown Last — Breakeven — Implied vol 188.1% Delta 0.942 ≈94% ITM Gamma 0.024 Theta -0.053 Vega 0.004 Open interest 0 Model this call Put · $15 Snapshot session Aug 4, 2026 Last $0.15 Breakeven $14.85 Implied vol 206% Delta -0.074 ≈7% ITM Gamma 0.027 Theta -0.068 Vega 0.004 Open interest 2 Model this put
0	—	—	—	—		$0.60	-0.175	175.8%	10	12
Call · $17.5 In the money Snapshot session Unknown Last — Breakeven — Implied vol — Delta — Gamma — Theta — Vega — Open interest 0 Model this call Put · $17.5 Snapshot session Jul 13, 2026 Last $0.60 Breakeven $16.90 Implied vol 175.8% Delta -0.175 ≈17% ITM Gamma 0.058 Theta -0.106 Vega 0.006 Open interest 12 Model this put
1.2k	4	48.2%	0.787	$0.45		$1.90	-0.315	85.6%	1	1
Call · $20 In the money Snapshot session Aug 12, 2026 Last $0.45 Breakeven $20.45 Implied vol 48.2% Delta 0.787 ≈79% ITM Gamma 0.239 Theta -0.035 Vega 0.007 Open interest 1.2k Model this call Put · $20 Snapshot session Jun 29, 2026 Last $1.90 Breakeven $18.10 Implied vol 85.6% Delta -0.315 ≈32% ITM Gamma 0.164 Theta -0.071 Vega 0.009 Open interest 1 Model this put
Underlying $20.91
330	3	233%	0.456	$0.20		$3.10	-0.72	92.9%	1	1
Call · $22.5 Snapshot session Aug 14, 2026 Last $0.20 Breakeven $22.70 Implied vol 233% Delta 0.456 ≈46% ITM Gamma 0.067 Theta -0.218 Vega 0.01 Open interest 330 Model this call Put · $22.5 In the money Snapshot session Jun 26, 2026 Last $3.10 Breakeven $19.40 Implied vol 92.9% Delta -0.72 ≈72% ITM Gamma 0.143 Theta -0.072 Vega 0.009 Open interest 1 Model this put
4	4	162.9%	0.215	$0.30		$4.90	-0.935	93.9%	1	1
Call · $25 Snapshot session Jul 20, 2026 Last $0.30 Breakeven $25.30 Implied vol 162.9% Delta 0.215 ≈22% ITM Gamma 0.07 Theta -0.112 Vega 0.007 Open interest 4 Model this call Put · $25 In the money Snapshot session Jun 26, 2026 Last $4.90 Breakeven $20.10 Implied vol 93.9% Delta -0.935 ≈93% ITM Gamma 0.055 Theta -0.027 Vega 0.003 Open interest 1 Model this put
0	—	254.6%	0.157	—		—	—	—	—	0
Call · $30 Snapshot session Unknown Last — Breakeven — Implied vol 254.6% Delta 0.157 ≈16% ITM Gamma 0.037 Theta -0.145 Vega 0.005 Open interest 0 Model this call Put · $30 In the money Snapshot session Unknown Last — Breakeven — Implied vol — Delta — Gamma — Theta — Vega — Open interest 0 Model this put
0	—	319.7%	0.133	—		—	—	—	—	0
Call · $35 Snapshot session Unknown Last — Breakeven — Implied vol 319.7% Delta 0.133 ≈13% ITM Gamma 0.026 Theta -0.16 Vega 0.006 Open interest 0 Model this call Put · $35 In the money Snapshot session Unknown Last — Breakeven — Implied vol — Delta — Gamma — Theta — Vega — Open interest 0 Model this put
0	—	376.6%	0.118	—		—	—	—	—	0
Call · $40 Snapshot session Unknown Last — Breakeven — Implied vol 376.6% Delta 0.118 ≈12% ITM Gamma 0.021 Theta -0.175 Vega 0.006 Open interest 0 Model this call Put · $40 In the money Snapshot session Unknown Last — Breakeven — Implied vol — Delta — Gamma — Theta — Vega — 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 26, 2026–Aug 14, 2026; 15 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 1297184 CUSIP 03209R103 13F (30d) 191 filings 189 filers Visit website Investor relations