Lead

Two members of Reddit’s WallStreetBets community posted that they earned sizable profits—one reporting a $128,000 gain and another a rapid 50‑point move that turned a modest position into a large win—by buying same‑day‑to‑expiration (0DTE) call options on the S&P 500 index (SPX) after the market opened.

Background

The SPX tracks the performance of 500 large‑cap U.S. equities and is a benchmark for equity market movements. Traders can buy call options that give the right, but not the obligation, to purchase the index at a predetermined strike price before expiration. A 0DTE call expires at the end of the trading day, making its price highly sensitive to intraday moves. Because the option’s time value erodes to zero at expiration, any favorable price swing can produce large percentage returns, while adverse moves can wipe out the premium paid.

What Happened

  • A user identified as /u/USSZim placed a limit order for 20 contracts of SPX 7380 strike calls, betting that the index would close near 7400 after the market’s overnight low was breached. The trade was executed, and the index immediately moved 50 points higher, resulting in a rapid profit for the trader.
  • Another WallStreetBets participant, posting as /u/nyjets239, disclosed a separate 0DTE SPX call trade that generated a $128,000 gain. The post did not specify the strike price, contract count, or exact market move, but the disclosed profit underscores the magnitude of returns possible with same‑day options.

Market & Industry Implications

The posts illustrate the appeal of 0DTE options among retail traders seeking quick, leveraged exposure to index movements. The reported gains demonstrate that, when market timing aligns with a sharp price swing, 0DTE calls can produce outsized returns relative to the capital deployed. However, the same mechanics that enable large profits also expose traders to total loss of the premium if the index moves opposite to the position.

What to Watch

  • Future activity on 0DTE SPX options, particularly during periods of heightened volatility, as traders may replicate similar strategies.
  • Regulatory scrutiny of retail trading platforms that facilitate high‑frequency, high‑risk option trades.
  • Market liquidity and bid‑ask spreads for near‑expiration SPX options, which can affect execution quality for large orders.