MRK · Trade Economics

Closed · forced exit dte 3

1x Bullish Put Credit Spread entered on Sep 14, 2026 with an expiration of 2026-09-18.

1. Setup & Quantitative Conviction

Multi-day relative streak metrics and Bayesian mean-reversion model probability

Streak Length—Relative streak

Robust Z-Score—Deviation vs SPY

Reversion Probability—Bayesian model

Underlying Spot$143.37At order generation

2. Option Legs Architecture

Vertical credit spread contract specifications and execution fill marks

Role	Contract Symbol	Strike	Option Type	Expiration	Entry Price	Current/Exit Price
Short Leg	`MRK260918P00145000`	$145.00	Call	2026-09-18	$2.45	$3.05
Long Wing	`MRK260918P00142000`	$142.00	Call	2026-09-18	$1.21	$1.05

3. Feasibility & Mean-Reversion Telemetry

Contextual stop-loss monitoring: required move to breakeven vs. remaining DTE expected volatility

Breakeven Line$143.76Short strike minus credit

Move Needed to Win+0.27%+$0.39 to BE

Expected Move (1σ)±3.27%Volatility over remaining DTE

Feasibility Ratio0.08x EMThreshold: ≤ 1.25x EM

Long Wing Barrier$142.00Structural floor intact

Feasibility Rule Status: Feasible (Recovery Projected). The required move to breakeven (0.27%) represents only 8% of the statistical expected move over the remaining holding window, meaning mean reversion remains highly feasible.

4. Capital & Risk Allocation Economics

Detailed margin requirement, cash premium collected, maximum capped loss, and return on capital

Net Entry Credit$1.24Per share ($100/contract)

Upfront Cash Collected$124.001 contracts total

Gross Margin Required$300.00$3.00 spread width

Max Potential Risk$176.00Capped worst-case loss

Max Return on Capital70.5%Premium / Max Risk

5. Realized Outcome & Capital Preservation

Intraday management, stop-loss trigger, realized P&L, and downside capital shielded

Exit Fill PriceClosedActive

Net Realized P&LClosedResolved

Capital Preserved—Shielded vs full max loss

Resolution Triggerforced exit dte 3Automated risk rule

Risk Management Note: This trade collected $124.00 upfront. When the spread widened, the position management system executed the stop-loss discipline, closing the spread at market. This successfully eliminated tail risk and preserved $0.00 that was otherwise exposed under the full spread width.

6. Broker Execution Audit Trail

Alpaca paper trading order submissions and fills

Time (UTC)	Order ID	Side	Qty	Limit Price	Status
15:45:30	`xpc-7a463313dedc...`	sell_to_open	25	$0.93	filled