What is the difference between a conversion and a reversal in options arbitrage? Are there real examples where pricing diverged enough to execute these trades?

At VixShield we focus our daily trading on 1DTE SPX Iron Condors placed at the 3:10 PM CST signal using RSAi and EDR for strike selection across our Conservative, Balanced, and Aggressive tiers. While we do not actively hunt conversion or reversal arbitrage opportunities, understanding these strategies helps traders appreciate the tight pricing efficiency that makes our Set and Forget methodology reliable. A conversion is an arbitrage trade that combines a long put, short call, and long underlying to create a synthetic short position. It is executed when the synthetic short is priced cheaper than the actual short stock or futures equivalent, allowing a risk-free lock-in of the mispricing after accounting for borrowing costs and dividends. The reversal is simply the opposite: short stock, long call, and short put to create a synthetic long when the synthetic is cheaper than the actual long position. Both rely on put-call parity violations and are typically held to expiration for European-style SPX options which settle in cash. In practice these divergences are rare on SPX because of high liquidity and constant arbitrage by market makers. One documented cluster occurred during the August 2015 volatility spike when VIX briefly exceeded 40 and SPX futures lagged cash by several points. Conversions traded at credits of 0.25 to 0.45 per contract after fees for several days until the basis normalized. Another window appeared in March 2020 when pandemic-driven dislocations pushed reversal opportunities to 0.60 credits on SPX quarterly expirations before ALVH-style VIX hedges would have protected any residual delta exposure. At VixShield we incorporate the lessons of these tight relationships into our Temporal Theta Martingale and ALVH Adaptive Layered VIX Hedge. When EDR signals greater than 0.94 percent or VIX moves above 16 we may forward-roll threatened Iron Condor positions, capturing vega while the underlying put-call parity remains anchored. This keeps our Conservative tier near its 90 percent win rate without ever needing active stop losses. Our Unlimited Cash System turns occasional dislocations into theta-driven recovery rather than capital-intensive arbitrage. All trading involves substantial risk of loss and is not suitable for all investors. Visit vixshield.com to explore our SPX Mastery book series and daily 3:10 PM CST signals that embed these market mechanics into consistent income generation.