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There’s nothing more frustrating than watching a winning trade slip away before you can even act on it.
Recently, I’ve been working a calendar spread strategy on S&P 500 index options (SPX) — selling short-dated calls and buying longer-dated calls at the same strike.
It’s a setup designed to capture time decay when the market stays range-bound, and it’s been working exactly as intended.
The interesting thing about SPX options is that they have live pricing overnight. So at 7 a.m. ET, I could see my position sitting at a 22% gain — well above my profit target.
Everything looked perfect…
But here’s the catch: My broker doesn’t allow me to execute trades until the market opens. So I had to sit there and watch. By the time 9:30 a.m. rolled around, that 22% gain had turned into a 7% loss.
Why Calendar Spreads Need Range-Bound Markets
The structure of this trade is simple in theory but precise in execution. You’re selling time in the short-dated option and buying it in the long-dated option. The profit comes from the difference in how fast those options decay.
But that only works when the underlying stays within a specific range. If the market makes a big move in either direction, the spread can work against you quickly. That’s exactly what happened between 7 a.m. and the open — the market moved and my edge evaporated.
The strategy itself was sound. The timing was right. But the inability to execute when the opportunity was there cost me the trade.
The Broker Problem You Don’t Think About Until It Costs You
This isn’t just about one trade. It’s about infrastructure.
Most traders don’t think about broker execution windows until they run into a situation like this. SPX options are priced overnight, but not all platforms let you trade them during those hours.
That gap between when you can see the opportunity and when you can act on it creates real slippage.
It’s a reminder that the tools you use matter just as much as the strategy you’re running. You can have the right setup, the right risk management, and the right timing — but if your platform won’t let you execute, none of it matters.
I’m not abandoning the strategy. It’s still solid and the market conditions are starting to line up again. But this experience reinforced something important: When you’re trading structures that move overnight, you need a broker that can keep up.
Otherwise, you’re just watching profits disappear before the bell even rings.
Graham Lindman
Graham Lindman Trading
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