Calendar vs Diagonal Spreads: What Changes
Calendar vs diagonal spreads: same short call, one different long strike. See what moving that long strike does to net delta and to the payoff shape.
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Half-Penny Tick Sizes Under Rule 612
Half-penny tick sizes under SEC Rule 612: which stocks qualify for the $0.005 increment, and how the time weighted average quoted spread is measured.
Why Market Makers Lose Money: Adverse Selection
Why do market makers lose money? Adverse selection is the main channel. See how markout curves measure it, plus inventory risk and queue position costs.
When Short Options Get Assigned Early
What makes a short option get assigned early: the dividend case, the interest case, the borrow case, and the margin call a short spread leg can produce.
What It Costs to Trade a Stock, Measured
Commissions are zero, but every stock trade pays the bid-ask spread. See the real cost of trading stocks, measured in basis points across 12 household names.
Why Are Spreads Wider at the Open? Real Data
Why are spreads wider at the open? Tick-level quotes price the opening premium half hour by half hour, show how fast it fades, and what premarket really costs.
Sector Scorecard H1 2026: Winners and Losers
All eleven S&P 500 sector ETFs ranked for H1 2026: the winners and losers, the Q1-to-Q2 rotation, breadth inside each sector, and what each costs to trade.
What Is a Bid-Ask Spread? Real Costs
Learn what a bid-ask spread is, how to calculate it, and what it costs per trade, with real spreads measured from tick-level quote data on US stocks.