I am short TSLA, 240 calls and 265 calls. TSLA makes great cars but they have negative profit margins and an absolutely absurd, dotcom-bubble-era valuation.
i think gambling on earnings is a terrible idea and should only be done for fun

The gambling analogy for options has no place in the Options forum on ET. US equity options are the most common type of equity derivative, they are sold and bought year round - including during earnings.
Be aware of the risk - below is a common disclaimer you might read on your brokers website.
"Options involve risks and are not suitable for everyone. Option trading can be speculative in nature and carry substantial risk of loss. Only invest with risk capital."
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Here's my short term trade:
With TSLA at 241.80
June 300/305 bear call spread for a net credit of $25
Yield = 25/475 = 5.26% in 46 days or 42% annualized
Prob = 89%
Expectation = .89(25) - .09(475) - .02(238) = 22.25 - 42.75 - 4.76 = -25
Price........... Profit / Loss........ ROM %
181.35............... 25.00............. 5.26%
219.71............... 25.00............. 5.26%
260.10............... 25.00............. 5.26%
300.00............... 25.00............. 5.00%
300.25................. 0.00............. 0.00%
300.48.............. (23.20).......... -4.64%
305.00............ (475.00)......... -94.74%
340.87............ (475.00)......... -94.74%
381.25............ (475.00)......... -94.74%
- TSLA earnings Wednesday May 4.
- TSLA at $241.80.
- TSLA 52-week high $286.00.
- On Tuesday May 3 buy TSLA 275.00 weekly call at $1.00.
- 10x trade if TSLA surpasses 52-week high after earnings.
- Need about plus 20% post earnings jump.

How'd you calculate your probability of success?