Originally published July 20, 2026 on The Trading Journal (tredey.com). Archived here as part of the Dependability research record.
SPX closed Friday at $7,457.69. BULL regime with 20d trend still positive but a mild 1.5% 5d pullback. SPX Aug 21 AM-settled 7170/7155 bull put spread, ~$300 credit, ~$1,200 max loss, ~80% POP.
SPX closed Friday at $7,457.69 after a week that saw defensive sectors lead the tape and a sharp energy bid extend on Iran headlines. VIX sits at 18.28 in mild contango versus VIX3M at 20.54 (term ratio 0.91), and the Federal Reserve's July 28–29 meeting is now nine calendar days out — close enough that the front end of the vol curve is starting to price for it.
The trade. Sell the SPX $7,170 put / buy the $7,155 put, expiring Friday morning, August 21, 2026 (AM-settled — standard monthly SPX settles on the Friday opening print, not the close). Net credit ~$300 per contract. Max loss ~$1,200. Breakeven $7,167.00. Probability of profit ~80% based on the −0.20-delta short put.
Why this structure. SPY is +0.6% over 20 sessions and the breadth proxy sits at 75% of large-cap ETFs above their 50-day moving average — the bull trend is intact, but the five-day tape is mildly soft at −1.5%. A pullback expression typically wants a sharper 5-day decline (the −3% threshold); the current drift is too shallow to qualify, and VIX is mid-band at 18.28. That setup favors credit over debit: a bull put spread on SPX keeps the upside open, and if SPX rallies through $7,170, the spread expires worthless for full credit. Cash-settled SPX means no early-assignment risk on the short put on ex-dividend dates or in fast markets.
Expected Move (1 Standard Deviation)
Using VIX 18.28 as the IV estimate, the 1σ expected moves for SPX are:
| Window | Points | Percent |
|---|---|---|
| 1 day | ±71 | ±0.96% |
| 1 week (5 sessions) | ±160 | ±2.14% |
| 30 days (to Aug 21) | ±391 | ±5.24% |
| 1 year (252 sessions) | ±1,132 | ±15.18% |
The 30-day 1σ move is ±391 points. The short strike is 288 points below spot — that puts the short strike ~0.74σ below current. The market is pricing in roughly a 77% probability that SPX stays above $7,170 over the next 30 sessions at the delta level. The 80% POP estimate adds back a small amount of theta decay and a slight skew adjustment on top of that delta-based read.
Market context
| Driver | Reading | Source |
|---|---|---|
| SPX spot | $7,457.69 | Friday close (yfinance) |
| SPX 5d return | −1.54% | Computed from closes |
| SPX 20d return | +0.57% | Computed from closes |
| VIX | 18.28 | Friday close |
| VIX3M | 20.54 | Friday close |
| Term ratio (VIX / VIX3M) | 0.91 | Mild contango |
| SPY % above 50d MA | ~75% | Breadth proxy |
| FOMC | Jul 28–29 (9 calendar days) | Federal Reserve calendar |
| Iran / oil | Brent in the high-$80s, Hormuz risk premium intact | News flow |
| Sector | 5d Return | Read |
|---|---|---|
| XLE (Energy) | +4.72% | Iran catalyst bid |
| XLV (Health Care) | +0.16% | Defensive bid |
| XLP (Consumer Staples) | +1.27% | Defensive bid |
| XLF (Financials) | +0.99% | Steepener trade |
| XLU (Utilities) | −0.53% | Stable |
| XLI (Industrials) | −1.38% | Slowdown concern |
| XLY (Consumer Discretionary) | −1.54% | Cyclical drag |
| XLB (Materials) | −0.71% | Industrial slowdown |
| XLK (Technology) | −5.48% | Rate-sensitivity pain |
Defensive-sector leadership paired with a sharp tech selloff is a late-cycle rotation signature. Breadth is still healthy at ~75% of large-cap ETFs above their 50-day moving average — the bull trend is intact, just less broad than a month ago. Tech (XLK) was the worst-performing sector over five days at −5.48%, which is the kind of single-sector drawdown that normally invites a buy-the-dip expression, except that the 5d SPX move does not meet the −3% pullback threshold required to qualify that path.
Structure details
| P&L field | Value | Math | ||
|---|---|---|---|---|
| Short $7,170 put (mid) | $50.75 | Live yfinance chain at 06:06 ET | ||
| Long $7,155 put (mid) | $47.75 | Live yfinance chain at 06:06 ET | ||
| Net credit | $300.00 per contract | $50.75 − $47.75 = $3.00 per share × 100 multiplier | ||
| Max profit | $300.00 | Credit received, kept in full if spread expires worthless | ||
| Max loss | $1,200.00 | ($15 width − $3.00 credit) × 100 = $12.00 × 100 | ||
| Breakeven | $7,167.00 | $7,170 short strike − $3.00 credit | ||
| POP estimate | ~80% | 1 − \ | −0.20 delta\ | for short-premium structure |
| Risk-reward | 4.0:1 reward-to-risk | $1,200 max loss vs $300 max profit (inverted: $4 risked per $1 made) | ||
| BSM estimate | $310.07 | +3.4% vs live; flat-IV Black-Scholes, within tolerance |
| Greek (per leg, BSM at spot) | Short $7,170 put | Long $7,155 put | Net |
|---|---|---|---|
| Delta | −0.20 | −0.16 | −0.04 |
| Theta | +0.10 | +0.09 | +0.19 per day |
| Vega | −0.27 | −0.24 | −0.51 per 1 vol point |
The trade collects ~$19 per day in theta while the position is open, with a small negative vega tail (long-vol exposure of roughly half a vega point per vol point) that the 15-point width keeps manageable.
Alternatives considered
| Rejected | Reason |
|---|---|
| Bull call vertical on SPX (debit) | Mid-vol regime with VIX 18.28 — debit would pay full premium for a delta 0.55 structure. Credit captures better risk-reward when direction is intact but conviction is moderate. |
| Iron condor on SPX | Range not confirmed (SPY 20d: +0.6%). Directional bias belongs in the structure; condors perform best when the tape is range-bound. |
| Bear put vertical | No bear regime — the trend is up. Short-premium structures outperform in confirmed bull regimes; long puts bleed theta against a positive 20-day drift. |
| SPY instead of SPX | SPY is American-style: short puts carry early-assignment risk on ex-dividend dates and in fast markets. SPX is cash-settled European-style — the institutional default for index-level strategies and the only choice for clean short-premium exposure. |
| Width | Short / Long | Credit | Max Loss | Breakeven | Notes |
|---|---|---|---|---|---|
| 10-wide (conservative) | $7,160 / $7,150 | $209 | $791 | $7,158.41 | Closest to the $1,000 default max-loss target |
| 15-wide (recommended) | $7,170 / $7,155 | $300 | $1,200 | $7,167.00 | Recommended width: matches the 0.20-delta target |
| 25-wide (aggressive) | $7,170 / $7,145 | $507 | $1,993 | $7,164.93 | Higher premium, larger drawdown if breached |
| 50-wide (max cap) | $7,170 / $7,120 | $969 | $4,031 | $7,160.31 | Approaches the position-sizing cap — only for higher-conviction accounts |
Risks to the trade
- FOMC risk (7 calendar days before expiry covers the meeting). If the Fed surprises hawkish or dovish on July 29, SPX can move 2–3% on the day. The $7,170 short strike is 288 points below spot — a 2% intraday move is roughly 149 points, putting the short strike at risk only on a hard downside break. A 3% intraday move (224 points) still leaves the strike intact. Risk amplifies if the move happens late in the week with the trade still open.
- Iran / oil escalation. A sustained oil spike above $95 with no diplomatic off-ramp would tighten financial conditions via the dollar and rates channel. Watch Brent and the DXY for confirmation. A close in SPX below $7,300 on the back of an oil shock would put the short strike in play.
- AM-settlement timing risk. Because the Aug 21 monthly SPX settles on the Friday morning opening print, the position cannot be managed after Thursday's close. Any overnight news from Thursday 4:00 PM ET through Friday 9:30 AM ET lands directly in the settlement print. Traders uncomfortable with that exposure should size smaller or close before Wednesday's close.
- Tech-led rotation extends. XLK is already −5.5% over five sessions. If the rotation broadens into XLK-adjacent names and QQQ breaks its 200-day moving average, the bull put's negative delta tail becomes a real drag. Monitor QQQ price relative to MA200 (currently $639.53).
- Assignment risk is NOT a concern. SPX is cash-settled European-style. The short put cannot be assigned early on ex-dividend dates or in any other scenario.
Position management
| Trigger | Action | Rationale |
|---|---|---|
| Profit-take at 50% | Close the spread at $150 debit ($150 of the $300 credit captured) | 50% profit capture is the standard theta-decay realization target. At ~$19/day theta, that hits around day 18–22 of the trade. |
| Stop-loss at 2× credit | Close the spread at $600 debit | A loss equal to 2× the credit received indicates the directional thesis is wrong and the trade should be exited rather than held to expiry. |
| Hard stop at the short strike breach | Close immediately if SPX trades below $7,170 on a closing basis | Defines the invalidation point cleanly. Holding through a breach invites max-loss. |
| Time stop one week before expiry (close by Aug 14, 2026) | Close the position regardless of P&L with one week remaining before the August 21 expiry | Gamma risk accelerates into the final week. Avoid the tail unless the trade has already realized the profit-take target. |
| FOMC adjustment | Consider closing before the Wednesday before FOMC (Jul 29) if the position is at less than 50% profit | Binary-event risk into the print. Alternatively, hedge with a long $7,050 put to convert the structure into a put-spread insurance profile at higher cost. |
What to watch today
- Brent crude and the DXY — confirmation or rejection of the defensive-rotation thesis. A break of Brent above $95 with DXY above 100.50 would tighten financial conditions enough to put pressure on the short strike.
- QQQ vs its 200-day MA at $639.53 — QQQ is currently $695.33, well above the long-term average, but the relative weakness in XLK (−5.5% over five days) is the leading indicator.
- VIX term structure — the current 0.91 ratio is mild contango. A flip into backwardation (ratio >1.05) would signal stress and warrant tightening stops or closing the trade early.
- FOMC speaker calendar — any pre-meeting Fed commentary that reframes the rate path will move the curve and the vol surface.
- 2s10s Treasury spread — currently flat at 0 bps. A move into inversion would layer the macro-caution signature on top of the defensive rotation.
Disclosures
Not investment advice. Educational content only. Options trading involves substantial risk of loss, including the full amount of premium paid for long-option structures or the full width of spreads for short-option structures. Past performance is not indicative of future results.
Live chain source. Strikes, mid premiums, and Greeks were pulled from the live yfinance SPX option chain at 06:06 ET on July 20, 2026. The BSM flat-IV estimate of $310.07 credit was 3.4% above the live mid credit of $300.00 — within the live-vs-BSM tolerance. Live values are used throughout this article. Strike selection was driven by the live chain; build the structure in your broker and confirm premiums before placing any orders.
Settlement note. Standard monthly SPX options are AM-settled — they expire on the Friday opening print, not the close. The last trade day for the Aug 21 expiry is Thursday, August 20, 2026. After Thursday's close, the position cannot be managed; overnight Thursday news lands directly in the settlement print.
Disclosure: the journal recommends OptionStrat for visualizing strategy P/L, breakevens, probability of profit, and greeks — the platform it uses daily. "Build this trade" links on this site are affiliate links; the recommendation is on the merits.
Disclaimer. This content is published for informational and educational purposes only. Nothing here is investment advice. Trading options involves substantial risk of loss and is not appropriate for every investor. Past performance, including the journal entries on this site, does not guarantee future results. You are solely responsible for your trading decisions.