SPX to SPY Conversion: How the Ratio Works
Understand the precise relationship between the S&P 500 index and its most popular ETF, including why the ratio drifts over time and how to calculate conversions accurately.
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Guides, explainers, and insights on converting between stock market indices, futures contracts, and ETFs.
NDX to QQQ: The Nasdaq 100 ETF Ratio
The Nasdaq 100 to QQQ ratio is approximately 38.5:1. Learn how this ratio is determined, why it changes, and how to convert between NDX index points and QQQ share prices.
Read More →Index to ETF Conversion: The Complete Guide
A comprehensive guide covering all major index-to-ETF conversions: SPX/SPY, NDX/QQQ, DJI/DIA, and RUT/IWM. Understand conversion ratios, why they drift, and how to use them.
Read More →ES Futures vs SPX: How E-mini Futures Track the Index
How E-mini S&P 500 futures relate to the SPX index, including basis, fair value, cost of carry, and why prices diverge during different market conditions.
Read More →SPY vs SPX: What Every Trader Should Know
SPY and SPX options are not the same. Learn the key differences in settlement, exercise style, tax treatment under Section 1256, and contract sizing that matter for your trading.
Read More →Dow Futures to DIA: How YM Relates to the Dow Jones
How YM (E-mini Dow futures) relates to the DJIA and DIA ETF. Includes conversion ratios, contract specs, and practical examples for Dow traders.
Read More →Russell 2000 Futures to IWM: RTY Conversion Explained
How RTY (E-mini Russell 2000 futures) relates to the RUT index and IWM ETF. Includes conversion ratios, contract specs, and practical examples for small-cap traders.
Read More →NQ Futures to QQQ: Converting Nasdaq Futures to ETF Prices
How NQ (E-mini Nasdaq 100 futures) relates to NDX and QQQ. Includes the ~40:1 conversion ratio, contract specs, and practical examples for Nasdaq traders.
Read More →SPX vs SPY Taxes: Section 1256 and the 60/40 Advantage
SPX index options qualify for Section 1256 tax treatment — 60% long-term, 40% short-term gains regardless of hold time. Here's exactly how much you save versus trading SPY options.
Read More →Futures Premium Explained: Why ES Trades Above or Below SPX
ES futures typically trade at a small premium above SPX due to cost of carry — interest rates minus dividend yield. Learn the fair value formula, how to calculate the basis, and what it means for reading pre-market direction.
Read More →Pre-Market Futures: What They Tell You About Today's Market Open
How to read pre-market ES and NQ futures to predict the market open. Learn the implied open formula, key time windows from overnight to 9:30 AM ET, and the common mistakes traders make before the bell.
Read More →Options Strike Conversion: SPX Strikes to SPY Equivalents
Convert any SPX option strike to its SPY equivalent using the live ratio. Covers contract size differences, European vs. American exercise, 60/40 tax treatment, and when to use SPX, SPY, or XSP options.
Read More →Futures Basis Explained: Cost of Carry for Index Futures
Futures basis is the gap between ES and SPX driven by cost of carry — financing rate minus dividend yield. Learn the fair value formula, how basis decays to zero at expiration, what the roll costs you, and how to strip out carry to read pre-market direction correctly.
Read More →After-Hours Trading: Which Instrument to Watch When Markets Close
When stock markets close, ES futures are the instrument to monitor — not SPY. Learn the overnight instrument hierarchy, which time windows carry genuine signal, and how to translate ES prices into SPY for accurate after-hours risk management.
Read More →Why Is SPY Not Exactly 1/10 of SPX? The NAV Drift Explained
SPY was designed to trade at 1/10 of SPX, but the ratio drifts over time due to the 0.0945% expense ratio, dividend cash drag from SPY's Unit Investment Trust structure, and index rebalancing timing. Learn exactly why and when it matters.
Read More →Micro E-mini (MES) vs ES vs SPY: Which Contract Is Right for You?
Compare contract size, margin requirements, liquidity, and tax treatment across MES ($5/pt), ES ($50/pt), and SPY shares. Includes hedge sizing math and a practical decision framework for small-account traders and hedgers.
Read More →ES Futures Quarterly Roll Dates: When and How to Roll Your Position
ES futures expire the third Friday of March, June, September, and December. Learn the 8-day roll window, how the calendar spread is priced from cost of carry, and what rolling costs you versus holding SPY.
Read More →Need to convert between index, futures, and ETF prices?
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