STRO · Sutro Biopharma, Inc.

Track STRO — free Ask ALVIS about STRO

$25.28 +1.13 (+4.68%)

Market Cap

$400.18M

16.57M

Options Chain

15-min delayed Underlying $25.28 · today Options Calculator

Positioning

Aug 21, 2026 · 14 days to expiry · 34 contracts

Put / call OI

0.42

Call-heavy positioning

Open interest

194

contracts outstanding

Volume

traded today

Max pain

$20.00

$5.28 below spot

ATM implied vol

159.7%

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 14d Sep 18 42d Nov 20 105d Feb 19 196d

Calls						Puts
OI	Vol	IV	Δ	Last	Strike	Last	Δ	IV	Vol	OI
1	2	823.5%	0.988	$14.32		—	—	—	—	0
Call · $2.5 In the money Last $14.32 Breakeven $16.82 Implied vol 823.5% Delta 0.988 ≈99% ITM Gamma 0.001 Theta -0.047 Vega 0.002 Open interest 1 Model this call Put · $2.5 Last — Breakeven — Implied vol — Delta — Gamma — Theta — Vega — Open interest 0 Model this put
0	—	489.4%	0.985	—		—	—	—	—	0
Call · $5 In the money Last — Breakeven — Implied vol 489.4% Delta 0.985 ≈99% ITM Gamma 0.002 Theta -0.033 Vega 0.002 Open interest 0 Model this call Put · $5 Last — Breakeven — Implied vol — Delta — Gamma — Theta — Vega — Open interest 0 Model this put
0	—	369%	0.979	—		—	—	—	—	0
Call · $7.5 In the money Last — Breakeven — Implied vol 369% Delta 0.979 ≈98% ITM Gamma 0.003 Theta -0.033 Vega 0.003 Open interest 0 Model this call Put · $7.5 Last — Breakeven — Implied vol — Delta — Gamma — Theta — Vega — Open interest 0 Model this put
3	5	270.5%	0.978	$9.06		$1.35	-0.044	346.9%	1	2
Call · $10 In the money Last $9.06 Breakeven $19.06 Implied vol 270.5% Delta 0.978 ≈98% ITM Gamma 0.004 Theta -0.026 Vega 0.003 Open interest 3 Model this call Put · $10 Last $1.35 Breakeven $8.65 Implied vol 346.9% Delta -0.044 ≈4% ITM Gamma 0.005 Theta -0.057 Vega 0.005 Open interest 2 Model this put
0	—	274.4%	0.943	—		$2.45	-0.057	273.2%	4	4
Call · $12.5 In the money Last — Breakeven — Implied vol 274.4% Delta 0.943 ≈94% ITM Gamma 0.008 Theta -0.057 Vega 0.006 Open interest 0 Model this call Put · $12.5 Last $2.45 Breakeven $10.05 Implied vol 273.2% Delta -0.057 ≈6% ITM Gamma 0.008 Theta -0.055 Vega 0.006 Open interest 4 Model this put
2	4	192%	0.943	$12.49		$1.00	-0.073	214.1%	1	1
Call · $15 In the money Last $12.49 Breakeven $27.49 Implied vol 192% Delta 0.943 ≈94% ITM Gamma 0.012 Theta -0.04 Vega 0.007 Open interest 2 Model this call Put · $15 Last $1.00 Breakeven $14.00 Implied vol 214.1% Delta -0.073 ≈7% ITM Gamma 0.013 Theta -0.052 Vega 0.007 Open interest 1 Model this put
6	2	185.1%	0.885	$11.20		$1.50	-0.095	164.8%	1	3
Call · $17.5 In the money Last $11.20 Breakeven $28.70 Implied vol 185.1% Delta 0.885 ≈88% ITM Gamma 0.021 Theta -0.065 Vega 0.011 Open interest 6 Model this call Put · $17.5 Last $1.50 Breakeven $16.00 Implied vol 164.8% Delta -0.095 ≈9% ITM Gamma 0.021 Theta -0.049 Vega 0.007 Open interest 3 Model this put
16	1	156.3%	0.823	$9.20		$1.96	-0.238	268%	20	27
Call · $20 In the money Last $9.20 Breakeven $29.20 Implied vol 156.3% Delta 0.823 ≈82% ITM Gamma 0.034 Theta -0.074 Vega 0.012 Open interest 16 Model this call Put · $20 Last $1.96 Breakeven $18.04 Implied vol 268% Delta -0.238 ≈24% ITM Gamma 0.023 Theta -0.147 Vega 0.015 Open interest 27 Model this put
2	1	144.2%	0.713	$11.90		$1.40	-0.286	141.5%	2	4
Call · $22.5 In the money Last $11.90 Breakeven $34.40 Implied vol 144.2% Delta 0.713 ≈71% ITM Gamma 0.048 Theta -0.089 Vega 0.016 Open interest 2 Model this call Put · $22.5 Last $1.40 Breakeven $21.10 Implied vol 141.5% Delta -0.286 ≈29% ITM Gamma 0.049 Theta -0.085 Vega 0.016 Open interest 4 Model this put
70	2	166.5%	0.581	$3.00		$2.65	-0.423	152.8%	1	8
Call · $25 In the money Last $3.00 Breakeven $28.00 Implied vol 166.5% Delta 0.581 ≈58% ITM Gamma 0.048 Theta -0.117 Vega 0.019 Open interest 70 Model this call Put · $25 Last $2.65 Breakeven $22.35 Implied vol 152.8% Delta -0.423 ≈42% ITM Gamma 0.052 Theta -0.106 Vega 0.019 Open interest 8 Model this put
Underlying $25.28
15	8	150.9%	0.339	$1.20		$8.00	-0.676	143.5%	8	8
Call · $30 Last $1.20 Breakeven $31.20 Implied vol 150.9% Delta 0.339 ≈34% ITM Gamma 0.049 Theta -0.098 Vega 0.019 Open interest 15 Model this call Put · $30 In the money Last $8.00 Breakeven $22.00 Implied vol 143.5% Delta -0.676 ≈68% ITM Gamma 0.051 Theta -0.089 Vega 0.019 Open interest 8 Model this put
12	6	254.3%	0.347	$2.98		—	-0.834	149.6%	—	0
Call · $35 Last $2.98 Breakeven $37.98 Implied vol 254.3% Delta 0.347 ≈35% ITM Gamma 0.029 Theta -0.167 Vega 0.02 Open interest 12 Model this call Put · $35 In the money Last — Breakeven — Implied vol 149.6% Delta -0.834 ≈83% ITM Gamma 0.034 Theta -0.064 Vega 0.01 Open interest 0 Model this put
1	1	174.5%	0.124	$2.00		—	-0.859	185%	—	0
Call · $40 Last $2.00 Breakeven $42.00 Implied vol 174.5% Delta 0.124 ≈12% ITM Gamma 0.023 Theta -0.063 Vega 0.011 Open interest 1 Model this call Put · $40 In the money Last — Breakeven — Implied vol 185% Delta -0.859 ≈86% ITM Gamma 0.025 Theta -0.07 Vega 0.011 Open interest 0 Model this put
2	2	201.7%	0.103	$2.51		—	-0.945	168.2%	—	0
Call · $45 Last $2.51 Breakeven $47.51 Implied vol 201.7% Delta 0.103 ≈10% ITM Gamma 0.018 Theta -0.064 Vega 0.012 Open interest 2 Model this call Put · $45 In the money Last — Breakeven — Implied vol 168.2% Delta -0.945 ≈95% ITM Gamma 0.014 Theta -0.03 Vega 0.007 Open interest 0 Model this put
0	—	233.4%	0.102	—		—	-0.95	193%	—	0
Call · $50 Last — Breakeven — Implied vol 233.4% Delta 0.102 ≈10% ITM Gamma 0.015 Theta -0.074 Vega 0.007 Open interest 0 Model this call Put · $50 In the money Last — Breakeven — Implied vol 193% Delta -0.95 ≈95% ITM Gamma 0.011 Theta -0.032 Vega 0.007 Open interest 0 Model this put
7	7	247.1%	0.088	$1.97		—	-0.954	215.3%	—	0
Call · $55 Last $1.97 Breakeven $56.97 Implied vol 247.1% Delta 0.088 ≈9% ITM Gamma 0.013 Theta -0.07 Vega 0.007 Open interest 7 Model this call Put · $55 In the money Last — Breakeven — Implied vol 215.3% Delta -0.954 ≈95% ITM Gamma 0.01 Theta -0.034 Vega 0.006 Open interest 0 Model this put
0	—	272.7%	0.09	—		—	-0.956	232.7%	—	0
Call · $60 Last — Breakeven — Implied vol 272.7% Delta 0.09 ≈9% ITM Gamma 0.012 Theta -0.078 Vega 0.008 Open interest 0 Model this call Put · $60 In the money Last — Breakeven — Implied vol 232.7% Delta -0.956 ≈96% ITM Gamma 0.009 Theta -0.035 Vega 0.004 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 1382101 CUSIP 869367201 13F (30d) 18 filings 18 filers Visit website Investor relations