ZLAB · Zai Lab Ltd

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$18.31 -0.31 (-1.66%) At close · Jul 29

Market Cap

$27.26B

1.46B

Options Chain

15-min delayed Underlying $18.31 · at close Jul 29, 2026 Options Calculator

Positioning

Aug 21, 2026 · 22 days to expiry · 24 contracts

Put / call OI

1.38

Put-heavy positioning

Open interest

500

contracts outstanding

Volume

236

traded today

Max pain

$20.00

$1.69 above spot

ATM implied vol

86.5%

market's expected move

Open interest by strike

Calls Puts

2.5

7.5

12.5

17.5

22.5

Chain

Click any strike for greeks, breakeven and the calculator

Expiry

Aug 21 22d Sep 18 50d Dec 18 141d Jan 15 169d Mar 19 232d Dec 17 505d

Calls						Puts
OI	Vol	IV	Δ	Last	Strike	Last	Δ	IV	Vol	OI
0	—	683.8%	0.978	—		$0.05	—	—	56	0
Call · $2.5 In the money Last — Breakeven — Implied vol 683.8% Delta 0.978 ≈98% ITM Gamma 0.002 Theta -0.036 Vega 0.002 Open interest 0 Model this call Put · $2.5 Last $0.05 Breakeven $2.45 Implied vol — Delta — Gamma — Theta — Vega — Open interest 0 Model this put
0	—	471.8%	0.954	—		—	—	—	—	0
Call · $5 In the money Last — Breakeven — Implied vol 471.8% Delta 0.954 ≈95% ITM Gamma 0.005 Theta -0.046 Vega 0.005 Open interest 0 Model this call Put · $5 Last — Breakeven — Implied vol — Delta — Gamma — Theta — Vega — Open interest 0 Model this put
0	—	331.7%	0.929	—		—	—	—	—	0
Call · $7.5 In the money Last — Breakeven — Implied vol 331.7% Delta 0.929 ≈93% ITM Gamma 0.009 Theta -0.045 Vega 0.007 Open interest 0 Model this call Put · $7.5 Last — Breakeven — Implied vol — Delta — Gamma — Theta — Vega — Open interest 0 Model this put
0	—	237.5%	0.899	—		—	-0.081	205.8%	—	0
Call · $10 In the money Last — Breakeven — Implied vol 237.5% Delta 0.899 ≈90% ITM Gamma 0.017 Theta -0.042 Vega 0.008 Open interest 0 Model this call Put · $10 Last — Breakeven — Implied vol 205.8% Delta -0.081 ≈8% ITM Gamma 0.017 Theta -0.031 Vega 0.006 Open interest 0 Model this put
0	—	166.5%	0.857	—		$0.38	-0.129	151.2%	1	1
Call · $12.5 In the money Last — Breakeven — Implied vol 166.5% Delta 0.857 ≈86% ITM Gamma 0.031 Theta -0.038 Vega 0.01 Open interest 0 Model this call Put · $12.5 Last $0.38 Breakeven $12.12 Implied vol 151.2% Delta -0.129 ≈13% ITM Gamma 0.031 Theta -0.031 Vega 0.01 Open interest 1 Model this put
0	—	109.6%	0.78	—		$0.65	-0.177	84.7%	10	11
Call · $15 In the money Last — Breakeven — Implied vol 109.6% Delta 0.78 ≈78% ITM Gamma 0.061 Theta -0.033 Vega 0.014 Open interest 0 Model this call Put · $15 Last $0.65 Breakeven $14.35 Implied vol 84.7% Delta -0.177 ≈18% ITM Gamma 0.07 Theta -0.021 Vega 0.011 Open interest 11 Model this put
9	5	136.1%	0.589	$3.60		$0.85	-0.402	37%	29	235
Call · $17.5 In the money Last $3.60 Breakeven $21.10 Implied vol 136.1% Delta 0.589 ≈59% ITM Gamma 0.065 Theta -0.053 Vega 0.017 Open interest 9 Model this call Put · $17.5 Last $0.85 Breakeven $16.65 Implied vol 37% Delta -0.402 ≈40% ITM Gamma 0.239 Theta -0.013 Vega 0.017 Open interest 235 Model this put
Underlying $18.31
98	10	77.2%	0.31	$0.76		$2.15	-0.7	75%	22	31
Call · $20 Last $0.76 Breakeven $20.76 Implied vol 77.2% Delta 0.31 ≈31% ITM Gamma 0.104 Theta -0.027 Vega 0.016 Open interest 98 Model this call Put · $20 In the money Last $2.15 Breakeven $17.85 Implied vol 75% Delta -0.7 ≈70% ITM Gamma 0.106 Theta -0.024 Vega 0.016 Open interest 31 Model this put
93	86	90.2%	0.177	$0.90		$3.00	—	—	12	12
Call · $22.5 Last $0.90 Breakeven $23.40 Implied vol 90.2% Delta 0.177 ≈18% ITM Gamma 0.065 Theta -0.023 Vega 0.013 Open interest 93 Model this call Put · $22.5 In the money Last $3.00 Breakeven $19.50 Implied vol — Delta — Gamma — Theta — Vega — Open interest 12 Model this put
7	2	120.1%	0.161	$0.45		—	—	—	—	0
Call · $25 Last $0.45 Breakeven $25.45 Implied vol 120.1% Delta 0.161 ≈16% ITM Gamma 0.046 Theta -0.029 Vega 0.009 Open interest 7 Model this call Put · $25 In the money Last — Breakeven — Implied vol — Delta — Gamma — Theta — Vega — Open interest 0 Model this put
2	2	160.7%	0.136	$0.05		—	—	—	—	0
Call · $30 Last $0.05 Breakeven $30.05 Implied vol 160.7% Delta 0.136 ≈14% ITM Gamma 0.031 Theta -0.035 Vega 0.01 Open interest 2 Model this call Put · $30 In the money Last — Breakeven — Implied vol — Delta — Gamma — Theta — Vega — Open interest 0 Model this put
1	1	193%	0.12	$0.05		—	—	—	—	0
Call · $35 Last $0.05 Breakeven $35.05 Implied vol 193% Delta 0.12 ≈12% ITM Gamma 0.023 Theta -0.038 Vega 0.011 Open interest 1 Model this call Put · $35 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 1704292 CUSIP 98887Q104 13F (30d) 25 filings 13 filers Visit website Investor relations