--- title: "Trading Data Reference Tables" description: "Reference tables for active trading and market microstructure: historical volatility benchmarks, options expiration calendars, margin requirement history." canonical: https://www.getswoopr.com/tables/trading/ source: "Swoopr Investment: https://www.getswoopr.com" --- Reference Data Tables › Trading Data Reference Tables # Trading Data Reference Tables Trading data reference tables cover the numerical benchmarks and structural data that active traders and options investors need for context. What is a normal level of implied volatility for the S&P 500? What are the historical margin requirements that shaped position sizing? When do options expire in a given quarter? These tables collect the reference data that informs those decisions. Search guides, glossary terms, tools and answers Search See all 10 guides Reference Data Tables ## Direct Answer > Trading reference tables provide quantitative context for active market participation. Volatility tables show what VIX levels historically correspond to market stress versus complacency. Options calendars show standard and weekly expiration dates. Margin tables show how margin requirements have changed under different regulatory environments. All three categories are structural inputs that inform execution decisions rather than investment thesis decisions. ## Common questions ### What does a VIX level of 20 mean compared to a level of 40? The VIX measures the market's 30-day implied volatility expectation for the S&P 500, derived from options prices. A VIX of 20 is near the long-run historical average and suggests moderate uncertainty. A VIX of 40 signals high market stress, corresponding to conditions like the 2020 COVID crash or the 2008 financial crisis. Implied volatility at elevated VIX levels makes options expensive as hedges and creates premium-selling opportunities for traders who believe the realized volatility will be lower than what the options imply. ### What is the difference between standard monthly options expiration and weekly options? Standard monthly options expire on the third Friday of each month (or the preceding Thursday if the Friday is a market holiday). Weekly options (also called "weeklys") expire on any Friday other than the standard monthly expiration, and many high-volume products also offer Tuesday and Thursday expirations. Weeklys have shorter time to expiration, which means faster theta decay and lower premium, making them popular for directional plays and income strategies that target a specific event like an earnings release. ## Every guide in this section 10 guides in this section. ## All guides - [Circuit Breakers](https://www.getswoopr.com/tables/trading/circuit-breakers-trading-halts/) Reference table for U.S. market-wide circuit breakers (Level 1: -7%, Level 2: -13%, Level 3: -20%) and LULD single-stock trading halt bands. - [Margin Requirements Reference](https://www.getswoopr.com/tables/trading/margin-requirements-reference/) Reference table for U.S. stock and options margin requirements: Regulation T initial margin (50%), FINRA maintenance margin minimums, portfolio margin. - [Market Hours & Trading Sessions Reference](https://www.getswoopr.com/tables/trading/market-hours-trading-sessions/) Reference table for NYSE, NASDAQ, and major global exchange trading hours in local time and ET, plus 2025 NYSE market holidays and extended hours trading risks. - [Options Expiration Calendar 2025](https://www.getswoopr.com/tables/trading/options-expiration-calendar-2025/) Standard monthly U.S. equity options expiration dates for 2025, including triple witching and quarterly expiry dates. - [Options Greeks Reference Table](https://www.getswoopr.com/tables/trading/options-greeks-reference/) Quick reference table for options greeks: delta, gamma, theta, vega, and rho. - [Options Strategy Payoff Reference](https://www.getswoopr.com/tables/trading/options-strategy-payoff-reference/) Reference table for common options strategies: max profit, max loss, breakeven, and market outlook for long calls, puts, covered calls, spreads, iron condors. - [Pattern Day Trader (PDT) Rule Reference](https://www.getswoopr.com/tables/trading/pattern-day-trader-rule-reference/) Reference table for the FINRA Pattern Day Trader rule: legacy PDT thresholds, $25,000 minimum equity, the 2026 FINRA intraday-margin framework change. - [SEC Rule 144 Resale Reference](https://www.getswoopr.com/tables/trading/sec-rule-144-resale-reference/) Reference table for SEC Rule 144 requirements for reselling restricted and control securities, including holding periods, volume limits. - [Trade Settlement Cycle Reference](https://www.getswoopr.com/tables/trading/settlement-cycle-reference/) Reference table for U.S. and global trade settlement cycles by security type: stocks T+1 (since May 2024), options T+1, Treasuries T+1, mutual funds T+1. - [Short Interest Tracking Reference](https://www.getswoopr.com/tables/trading/short-interest-tracking-reference/) Reference table for short interest metrics: short interest ratio (days to cover), short interest as percentage of float, data sources. ## About the author This guide was written and reviewed by the [Swoopr Editorial Team](https://www.getswoopr.com/authors/swoopr-editorial-team/), which researches and maintains Swoopr Investment's educational library. Corrections and methodology are covered by our [editorial policy](https://www.getswoopr.com/legal/editorial-policy/). Found an error? Tell us and we will fix it.