STX, Oct 2, 2026 · Trading desk

Paper trading, not investment advice. Every account and book on these pages trades paper money: the Alpaca paper accounts DAILY ($1,000,000 from Sep 30, 2026), INTRA1 ($100,000 from Sep 30, 2026) and INTRA2 ($100,000 from Sep 30, 2026); the simulated books SIM-TT ($100,000 from Sep 29, 2026), SIM-V2B ($100,000 from Sep 28, 2026) and SIM-V2B-TOM ($100,000 from Sep 28, 2026), filled at the official close; and market-analysis's ledgers, one contract per position against a $100,000 reporting equity. No real money is at stake. Positions, trades and P&L are published the same day, as the engines record them, with each number's source and cost model labelled. Nothing here is a recommendation to buy, sell or hold any security, and nothing is tailored to you. Each strategy is a pre-registered experiment, read once on a date or at a trade count fixed in advance; until then its record says little either way. I may hold or have held positions in securities shown here. Markets can and do lose money.

Account: MA
Strategy: S-C C1 short straddle, exploration
Book: exploration
Symbol: STX
Asset class: option structure
Side: short
Exposure: neutral
Status: open
Opened: Oct 2, 2026
Closed: —
Quantity: 1
Entry price: 131.927101
Exit price: —
Exit by: —
Book value at entry: —

Record GitHub ledger

Cost model

half of each leg's quoted spread from 15:00 to 16:00 ET plus $0.65 a contract at entry; nothing at expiry

Role	Date	At (ET)	Side	Qty	Asked	Price	Rule's price	Close	Slippage	Against the close	How	Why	The rule's numbers
entry	Oct 2, 2026	—	sell	1	—	131.927101	—	—	—	—	late window	F3	4 trigger numbers rank null verdict F3 cap_pass true cap_reason null 13 numbers k 850 k_dn null k_up null close 848.99 iv30d 0.697606291812654 sector Technology dte_cal 28 marketcap 214308256885 sigma_hold 164.0384085326954 mean_spread 0.13756278260869564 model_entry false entry_cost_usd 908.9687220992437 entry_tier_max 1

Contract	Right	Strike	Expiry	Side	Qty	Entry	Exit	Facts
STX261030C00850000	call	850.00	Oct 30, 2026	short	1	65.720435	—	4 numbers exit_tier null entry_tier 1 entry_source print_vwap entry_spread 0.1270425652173913
STX261030P00850000	put	850.00	Oct 30, 2026	short	1	66.206667	—	4 numbers exit_tier null entry_tier 1 entry_source print_vwap entry_spread 0.148083

variant: C1
risk_usd: 36119.81241488108
graded_at: null
policy_id: sc-1.0
structure: SS
max_loss_usd: null
stress_loss_usd: 36119.81241488108

STX · S-C C1 short straddle, exploration

The trade

Entry and exit

Legs

Notes