CPRX · Catalyst Pharmaceuticals, Inc.

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$31.49 +0.00 (+0.00%) At close · Jul 21

Market Cap

$3.85B

122.38M

Options Chain

15-min delayed Underlying $31.49 · at close Jul 21, 2026 Options Calculator

Positioning

Aug 21, 2026 · 26 days to expiry · 27 contracts

Put / call OI

0.19

Call-heavy positioning

Open interest

7,510

contracts outstanding

Volume

1,771

traded today

Max pain

$30.00

$1.49 below spot

ATM implied vol

8.1%

market's expected move

Open interest by strike

Calls Puts

17.5

22.5

Chain

Click any strike for greeks, breakeven and the calculator

Expiry

Aug 21 26d

Calls						Puts
OI	Vol	IV	Δ	Last	Strike	Last	Δ	IV	Vol	OI
0	2	0.2%	1	$16.00		$0.52	—	—	1	1
Call · $15 In the money Last $16.00 Breakeven $31.00 Implied vol 0.2% Delta 1 ≈100% ITM Gamma 0 Theta -0.001 Vega 0 Open interest 0 Model this call Put · $15 Last $0.52 Breakeven $14.48 Implied vol — Delta — Gamma — Theta — Vega — Open interest 1 Model this put
10	1	98.9%	0.992	$13.73		$0.43	—	—	2	55
Call · $17.5 In the money Last $13.73 Breakeven $31.23 Implied vol 98.9% Delta 0.992 ≈99% ITM Gamma 0.003 Theta -0.005 Vega 0.001 Open interest 10 Model this call Put · $17.5 Last $0.43 Breakeven $17.07 Implied vol — Delta — Gamma — Theta — Vega — Open interest 55 Model this put
4	7	74.9%	0.992	$11.36		$0.05	—	—	6	10
Call · $20 In the money Last $11.36 Breakeven $31.36 Implied vol 74.9% Delta 0.992 ≈99% ITM Gamma 0.003 Theta -0.005 Vega 0.001 Open interest 4 Model this call Put · $20 Last $0.05 Breakeven $19.95 Implied vol — Delta — Gamma — Theta — Vega — Open interest 10 Model this put
5	—	53.7%	0.993	—		$0.03	—	—	1	66
Call · $22.5 In the money Last — Breakeven — Implied vol 53.7% Delta 0.993 ≈99% ITM Gamma 0.004 Theta -0.004 Vega 0.001 Open interest 5 Model this call Put · $22.5 Last $0.03 Breakeven $22.47 Implied vol — Delta — Gamma — Theta — Vega — Open interest 66 Model this put
103	25	49%	0.968	$6.50		$0.05	—	—	2	21
Call · $25 In the money Last $6.50 Breakeven $31.50 Implied vol 49% Delta 0.968 ≈97% ITM Gamma 0.017 Theta -0.008 Vega 0.007 Open interest 103 Model this call Put · $25 Last $0.05 Breakeven $24.95 Implied vol — Delta — Gamma — Theta — Vega — Open interest 21 Model this put
335	262	—	—	$1.55		$0.07	-0.112	16%	11	62
Call · $30 In the money Last $1.55 Breakeven $31.55 Implied vol — Delta — Gamma — Theta — Vega — Open interest 335 Model this call Put · $30 Last $0.07 Breakeven $29.93 Implied vol 16% Delta -0.112 ≈11% ITM Gamma 0.145 Theta -0.005 Vega 0.014 Open interest 62 Model this put
Underlying $31.49
15	5	—	—	$0.05		—	—	—	—	—
Call · $35 Last $0.05 Breakeven $35.05 Implied vol — Delta — Gamma — Theta — Vega — Open interest 15 Model this call Put · $35 In the money Not listed at this strike.
2	3	—	—	$0.06		—	—	—	—	—
Call · $40 Last $0.06 Breakeven $40.06 Implied vol — Delta — Gamma — Theta — Vega — Open interest 2 Model this call Put · $40 In the money Not listed at this strike.
2	2	—	—	$0.06		—	—	—	—	—
Call · $45 Last $0.06 Breakeven $45.06 Implied vol — Delta — Gamma — Theta — Vega — Open interest 2 Model this call Put · $45 In the money Not listed at this strike.

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 1369568 CUSIP 14888U101 13F (30d) 76 filings 76 filers Visit website Investor relations