STRO Strangle Strategy
STRO (Sutro Biopharma, Inc.), in the Healthcare sector, (Biotechnology industry), listed on NASDAQ.
Sutro Biopharma, Inc. is a clinical-stage biotechnology company focused on the discovery, development, and manufacturing of innovative therapeutic products. Its primary objective is to create protein-based treatments for challenging conditions like cancer and autoimmune disorders. The company achieves this through its proprietary XpressCF+ platform, a unique technology that integrates cell-free protein synthesis with precise, site-specific drug conjugation. Currently, Sutro's pipeline features two lead antibody-drug conjugate (ADC) candidates, both undergoing Phase 1 clinical evaluation. STRO-001 targets the CD74 protein, designed for individuals with multiple myeloma and non-Hodgkin lymphoma. The second candidate, STRO-002, is engineered to bind to folate receptor-alpha, intended for the treatment of ovarian and endometrial cancers.
STRO (Sutro Biopharma, Inc.) trades in the Healthcare sector, specifically Biotechnology, with a market capitalization of approximately $295.3M, a beta of 1.55 versus the broader market, a 52-week range of 6.7-43.85, average daily share volume of 314K, a public-listing history dating back to 2018, approximately 269 full-time employees. These structural characteristics shape how STRO stock options price implied volatility around earnings windows, capital events, and macro-driven sector rotations.
A beta of 1.55 indicates STRO has historically moved more than the broader market, amplifying both the directional payoff and the realized volatility relative to an index-equivalent position.
What is a strangle on STRO?
A long strangle buys an OTM call and an OTM put at offset strikes, cheaper than a straddle but requiring a larger underlying move to profit since both wings start out-of-the-money.
Current STRO snapshot
As of June 30, 2026, spot at $32.83, ATM IV 144.40%, IV rank 23.77%, expected move 41.40%. The strangle on STRO below is built from the same end-of-day chain, with strikes snapped to listed contracts and premiums pulled from the bid/ask midpoint at a 17-day expiry.
Why this strangle structure on STRO specifically: STRO IV at 144.40% is on the cheap side of its 1-year range, which favors premium-buying structures like a STRO strangle, with a market-implied 1-standard-deviation move of approximately 41.40% (roughly $13.59 on the underlying). The 17-day window matched to the front-month expiry keeps theta exposure bounded while still capturing the post-snapshot move; longer-dated STRO expiries trade a higher absolute premium for lower per-day decay. Position sizing on STRO should anchor to the underlying notional of $32.83 per share and to the trader's directional view on STRO stock.
STRO strangle setup
The STRO strangle below is built from the end-of-day chain, with each option leg priced at the bid/ask midpoint of its listed strike. With STRO near $32.83, the first option leg uses a $34.47 strike; additional legs (when the strategy has them) anchor to spot-relative offsets. Premiums come from the bid/ask midpoint on the listed STRO chain at a 17-day expiry; the cross-strike IV skew is reflected directly in the per-leg values rather than approximated. Quantity sizing assumes one contract per option leg (or 100 STRO shares for the stock leg in covered calls and collars).
| Action | Type | Strike / Basis | Premium (est) |
|---|---|---|---|
| Buy 1 | Call | $34.47 | N/A |
| Buy 1 | Put | $31.19 | N/A |
STRO strangle risk and reward
- Net Premium / Debit
- N/A
- Max Profit (per contract)
- Unbounded
- Max Loss (per contract)
- Unbounded
- Breakeven(s)
- None on modeled curve
- Risk / Reward Ratio
- N/A
Upside max profit is unbounded; downside max profit is bounded at the put strike minus the combined debit (reached at zero). Max loss equals the combined debit times 100 (reached anywhere between the two OTM strikes). Two breakevens at call-strike plus debit and put-strike minus debit.
STRO strangle payoff curve
Modeled P&L at expiration across a range of underlying prices for the strangle on STRO. Each row is one sampled price point from the computed payoff curve; the full curve uses 200 price points internally before being summarized into 10 rows here.
When traders use strangle on STRO
Strangles on STRO are the cheaper cousin of the straddle - traders use them when they want a large directional move but are willing to give up the inner-strike sensitivity in exchange for a lower up-front debit on the STRO chain.
STRO thesis for this strangle
The market-implied 1-standard-deviation range for STRO extends from approximately $19.24 on the downside to $46.42 on the upside. A STRO long strangle is the OTM cousin of the straddle: lower up-front cost but the underlying has to travel further past either OTM strike before the position turns profitable at expiration. Current STRO IV rank near 23.77% sits in the lower third of its 1-year distribution, where IV often re-expands toward the mean; this favors premium-buying structures and disadvantages premium-selling structures on STRO at 144.40%. As a Healthcare name, STRO options can move on sector-level news flow (peer earnings, regulatory updates, industry-specific macro data) in addition to STRO-specific events.
STRO strangle positions are structurally neutral / high-volatility (long premium, OTM); the modeled P&L assumes European-style exercise at expiration and ignores early assignment, transaction costs, dividends paid before expiry on the stock leg (when present), and the bid-ask spread on the listed chain. STRO positions also carry Healthcare sector concentration risk; news flow inside the sector (peer earnings, regulatory shifts, supply-chain headlines) can move STRO alongside the broader basket even when STRO-specific fundamentals are unchanged. Always rebuild the position from current STRO chain quotes before placing a trade.
Frequently asked questions
- What is a strangle on STRO?
- A strangle on STRO is the strangle strategy applied to STRO (stock). The strategy is structurally neutral / high-volatility (long premium, OTM): A long strangle buys an OTM call and an OTM put at offset strikes, cheaper than a straddle but requiring a larger underlying move to profit since both wings start out-of-the-money. With STRO stock trading near $32.83, the strikes shown on this page are snapped to the nearest listed STRO chain strike and the premiums come straight from the end-of-day bid/ask midpoint.
- How are STRO strangle max profit and max loss calculated?
- Upside max profit is unbounded; downside max profit is bounded at the put strike minus the combined debit (reached at zero). Max loss equals the combined debit times 100 (reached anywhere between the two OTM strikes). Two breakevens at call-strike plus debit and put-strike minus debit. For the STRO strangle priced from the end-of-day chain at a 30-day expiry (ATM IV 144.40%), the computed maximum profit is unbounded per contract and the computed maximum loss is unbounded per contract. Live intraday quotes will differ as the chain moves through the trading session.
- What is the breakeven for a STRO strangle?
- The breakeven for the STRO strangle priced on this page is no defined breakeven on the modeled curve at expiration, derived from end-of-day chain premiums. Breakeven is the underlying price at which the strategy's P&L crosses zero ignoring transaction costs and assignment risk. The current STRO market-implied 1-standard-deviation expected move is approximately 41.40%; if the move sits well outside the breakeven distance, the structure's risk-reward becomes correspondingly tighter.
- When should you consider a strangle on STRO?
- Strangles on STRO are the cheaper cousin of the straddle - traders use them when they want a large directional move but are willing to give up the inner-strike sensitivity in exchange for a lower up-front debit on the STRO chain.
- How does current STRO implied volatility affect this strangle?
- STRO ATM IV is at 144.40% with IV rank near 23.77%, which is on the low end of its 1-year range. Premium-buying structures (long call, long put, debit spreads) are relatively cheap in this regime; premium-selling structures collect less credit per unit risk.