Most retail traders don't lose money on earnings straddles because their thesis is wrong. They lose because of position sizing — and nobody enforces the cap when it matters.

The math nobody does before earnings:

An ATM straddle prices in the market's expected move — derived from IV. If a stock is trading $100 with a front-week ATM straddle priced at $6, the market is pricing roughly a 6% move on the print. Your edge isn't predicting direction — it's whether realized moves have historically exceeded that priced-in expected move for this specific name.

Where accounts actually blow up:

Not from being wrong on direction. From sizing a straddle at 8-10% of account value because "this one's a high conviction play" — and then eating a 60%+ IV crush plus a smaller-than-priced move. One bad earnings week erases a quarter of gains.

The fix — a hard-enforced risk cap, not a mental one:

• Max 2% of account per single earnings straddle

• Max 6% of account per earnings week (covers weeks with 3+ reports)

• The cap is enforced at the order-ticket level, not "remembered" under pressure

The reason this works isn't the numbers themselves — it's that they're automated and non-negotiable. Discretionary risk management fails exactly when volatility is highest, which is the one moment earnings straddles guarantee.

If you're trading earnings weekly and want this enforced automatically (broker-connected risk-cap bot + weekly expected-move breakdowns), that's exactly what we built Earnings Straddle Map for. Happy to answer sizing/IV questions in the comments either way.