SPRO Bull Call Spread Strategy
SPRO (Spero Therapeutics, Inc.), in the Healthcare sector, (Biotechnology industry), listed on NASDAQ.
Spero Therapeutics, Inc. is a biopharmaceutical firm in the clinical development stage, primarily focused on discovering, advancing, and commercializing innovative treatments for multi-drug resistant (MDR) bacterial infections and rare diseases within the United States. The company's pipeline includes several key therapeutic candidates: tebipenem pivoxil hydrobromide (HBr), an oral carbapenem-class antibiotic designed to address complicated urinary tract infections (cUTIs), including pyelonephritis, in adult patients. SPR206, an intravenously administered agent specifically developed to combat MDR Gram-negative bacterial infections in hospital environments. SPR720, an oral antibiotic targeting non-tuberculous mycobacterial (NTM) pulmonary disease. Spero Therapeutics has also forged several strategic alliances: A licensing agreement with Meiji Seika Pharma Co., Ltd. supports the ongoing development of tebipenem HBr. A separate licensing deal with Everest Medicines grants rights for the development, manufacturing, and commercialization of SPR206 across Greater China, South Korea, and various Southeast Asian nations.
SPRO (Spero Therapeutics, Inc.) trades in the Healthcare sector, specifically Biotechnology, with a market capitalization of approximately $68.9M, a trailing P/E of 4.07, a beta of 1.48 versus the broader market, a 52-week range of 1.08-3.08, average daily share volume of 1.3M, a public-listing history dating back to 2017, approximately 25 full-time employees. These structural characteristics shape how SPRO stock options price implied volatility around earnings windows, capital events, and macro-driven sector rotations.
A beta of 1.48 indicates SPRO has historically moved more than the broader market, amplifying both the directional payoff and the realized volatility relative to an index-equivalent position. The trailing P/E of 4.07 is on the value side, where IV often compresses outside event windows because forward growth expectations are already discounted into the share price. SPRO pays a dividend, which adjusts put-call parity and shifts the ex-dividend pricing across the listed chain.
What is a bull call spread on SPRO?
A bull call spread buys an at-the-money call and sells an out-of-the-money call at a higher strike for defined risk and defined reward bounded by the strike width.
SPRO snapshot
As of August 14, 2026, spot at $1.23, ATM IV 239.10%, IV rank 48.07%, expected move 68.55%. The bull call spread on SPRO below is built from the end-of-day chain, with strikes snapped to listed contracts and premiums pulled from the bid/ask midpoint at a 35-day expiry.
Why this bull call spread structure on SPRO specifically: SPRO IV at 239.10% is mid-range versus its 1-year history, so strategy selection should anchor more to the directional thesis than to the IV regime, with a market-implied 1-standard-deviation move of approximately 68.55% (roughly $0.84 on the underlying). The 35-day window matched to the front-month expiry keeps theta exposure bounded while still capturing the post-snapshot move; longer-dated SPRO expiries trade a higher absolute premium for lower per-day decay. Position sizing on SPRO should anchor to the underlying notional of $1.23 per share and to the trader's directional view on SPRO stock.
SPRO bull call spread setup
The SPRO bull call spread below is built from the end-of-day chain, with each option leg priced at the bid/ask midpoint of its listed strike. With SPRO at $1.23 on that close, the first option leg uses a $1.23 strike; additional legs (when the strategy has them) anchor to spot-relative offsets. Premiums come from the bid/ask midpoint on the listed SPRO chain at a 35-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 SPRO shares for the stock leg in covered calls and collars).
| Action | Type | Strike / Basis | Premium (est) |
|---|---|---|---|
| Buy 1 | Call | $1.23 | N/A |
| Sell 1 | Call | $1.29 | N/A |
SPRO bull call spread 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
Max profit equals strike width minus net debit times 100; max loss equals net debit times 100. Breakeven is long-call strike plus net debit.
SPRO bull call spread payoff curve
Modeled P&L at expiration across a range of underlying prices for the bull call spread on SPRO. 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 bull call spread on SPRO
Bull call spreads on SPRO reduce the cost of a bullish SPRO stock position by selling a higher-strike call; suited to moderate-move theses where price reaches but does not vastly exceed the short strike.
SPRO thesis for this bull call spread
The market-implied 1-standard-deviation range for SPRO extends from approximately $0.39 on the downside to $2.07 on the upside. A SPRO bull call spread caps both the risk and the reward of a bullish position; relative to an outright long call on SPRO, the spread reduces the cost basis but limits the maximum profit to the strike width minus net debit. Current SPRO IV rank near 48.07% is mid-range against its 1-year distribution, so the IV signal is neutral; the bull call spread thesis on SPRO should anchor more to the directional view and the expected-move geometry. As a Healthcare name, SPRO options can move on sector-level news flow (peer earnings, regulatory updates, industry-specific macro data) in addition to SPRO-specific events.
SPRO bull call spread positions are structurally moderately bullish; 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. SPRO positions also carry Healthcare sector concentration risk; news flow inside the sector (peer earnings, regulatory shifts, supply-chain headlines) can move SPRO alongside the broader basket even when SPRO-specific fundamentals are unchanged. Long-premium structures like a bull call spread on SPRO are particularly exposed to IV-crush risk through scheduled events (earnings, FDA decisions, central-bank meetings) where IV typically contracts post-event regardless of the directional outcome. Always rebuild the position from current SPRO chain quotes before placing a trade.
Frequently asked questions
- What is a bull call spread on SPRO?
- A bull call spread on SPRO is the bull call spread strategy applied to SPRO (stock). The strategy is structurally moderately bullish: A bull call spread buys an at-the-money call and sells an out-of-the-money call at a higher strike for defined risk and defined reward bounded by the strike width. With SPRO stock at $1.23 on the most recent close, the strikes shown on this page are snapped to the nearest listed SPRO chain strike and the premiums come straight from that session's bid/ask midpoint.
- How are SPRO bull call spread max profit and max loss calculated?
- Max profit equals strike width minus net debit times 100; max loss equals net debit times 100. Breakeven is long-call strike plus net debit. For the SPRO bull call spread priced from the end-of-day chain at a 30-day expiry (ATM IV 239.10%), 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 SPRO bull call spread?
- The breakeven for the SPRO bull call spread priced on this page is no defined breakeven on the modeled curve at expiration, derived from the end-of-day chain's premiums. Breakeven is the underlying price at which the strategy's P&L crosses zero ignoring transaction costs and assignment risk. The SPRO market-implied 1-standard-deviation expected move in the same options snapshot is approximately 68.55%; if the move sits well outside the breakeven distance, the structure's risk-reward becomes correspondingly tighter.
- When should you consider a bull call spread on SPRO?
- Bull call spreads on SPRO reduce the cost of a bullish SPRO stock position by selling a higher-strike call; suited to moderate-move theses where price reaches but does not vastly exceed the short strike.
- How does current SPRO implied volatility affect this bull call spread?
- SPRO ATM IV is at 239.10% with IV rank near 48.07%, which is mid-range against its 1-year history. Strategy selection depends more on directional thesis and expected move than on a strong IV signal.