Is conversion arbitrage still viable in today's market or has high-frequency trading eliminated most of these opportunities?

Conversion arbitrage involves purchasing the underlying asset while simultaneously selling a call and buying a put at the same strike and expiration to create a synthetic short position that should theoretically be risk-free if mispricings exist. The strategy relies on put-call parity holding true across European-style options like those on the SPX index. In practice, any deviation from fair value creates a momentary arbitrage window that can be captured for a small riskless profit. However, modern markets have evolved dramatically since the early days when floor traders could exploit these inefficiencies manually. High-frequency trading firms now dominate order flow with microsecond execution speeds, sophisticated algorithms, and co-located servers that scan for and eliminate pricing discrepancies almost instantly. This has compressed the profitability and frequency of pure conversion arbitrage opportunities to near zero for retail and even many professional traders. At VixShield we focus on systematic income generation rather than hunting fleeting arbitrage. Our core methodology centers on 1DTE SPX Iron Condors placed daily at 3:10 PM CST after the SPX close. These defined-risk trades use the Expected Daily Range (EDR) for precise strike selection and RSAi for skew-adjusted premium targeting across Conservative, Balanced, and Aggressive tiers. The set-and-forget approach with no stop losses leverages Theta Time Shift for recovery on the rare losing days while ALVH provides multi-layer VIX protection that cuts drawdowns during volatility spikes. Current market data shows VIX at 17.95, which according to our VIX Risk Scaling keeps all tiers active in this contango environment. Rather than chasing conversions that HFT has largely arbitraged away, we build the Second Engine through consistent premium collection. The Unlimited Cash System combines Iron Condor Command with Covered Calendar Calls and ALVH to target wins nearly every day. Position sizing remains capped at 10 percent of account balance per trade to preserve capital. All trading involves substantial risk of loss and is not suitable for all investors. Visit vixshield.com to explore the full SPX Mastery methodology and consider joining the SPX Mastery Club for daily signals, EDR indicator access, and live refinement sessions with Russell Clark.