The One Number That Tells You Which Option to Sell

Finance-focused summary (options / theta / short puts)

Core concept: “theta-based” options trading

• The approach aims to earn theta: the rate at which an option’s value decays as time passes.
• Out-of-the-money (OTM) options often experience faster decay as expiration approaches, which can be a tailwind for option sellers.
• The strategy is less about correctly forecasting price direction (and even volatility) and more about relying on the passage of time to generate returns.

Methodology / framework: how to choose an option to sell

Short put example (simplified “naked short put” case)

• Identify the margin / capital requirement, which depends mainly on:
  • Underlying stock price
  • Strike relative to the stock price
• Changing expiration (e.g., 8 → 15 → 22 → 36 days) is described as having little meaningful effect on the capital requirement in the example shown.
• Changing volatility may affect option credits/prices, but the capital requirement is described as not necessarily changing materially.

Evaluate using “theta return on capital”

• Benchmark referenced: ~0.1% per day (theta expressed as a % of capital).
• Compare expected theta dollars per day to required capital dollars.

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Key example and explicit numbers

Underlying used: Comcast (CMCSA)

• Stock price cited: ~$23.50

Strategy example: sell a naked short put across expirations

• Sell a put with a $23 strike at different times to expiration.
• Starting point: 8 days to expiration
  • Short 23 put
  • Capital / buying power effect: $423
• Move to longer expirations (capital requirement stays roughly the same):
  • 15 days: ~$422
  • 22 days: ~$420
  • 29 days: ~$421
  • 36 days: ~$427

Conclusion from example: In the illustration, capital requirement depends mostly on stock price/strike distance, not expiration length.

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Theta / return-on-capital benchmark and calculations

Benchmark: 0.1% per day

• Example framing:
  • If capital requirement is $100, then 0.1% per day theta = $0.10/day.

Comcast example with different strikes

Strike: $23 (far OTM vs ~$23.50 stock)

• Capital requirement: ~$427
• Theta generated: ~$1.31/day
• Compare to 0.1% of capital:
  • 0.1% of $427 ≈ $0.42/day
  • $1.31/day is ~3× the benchmark
• Interpreted as roughly: ~0.3% per day theta-on-capital (speaker’s estimate)

Lower strike: $22 (more OTM “room”)

• Theta generated: ~$1.13/day
• Speaker notes: moving farther OTM can reduce capital requirements.

Even lower strike: $21

• Capital requirement cited: ~$233 (much lower)
• Theta cited: ~$0.20/day
• Speaker’s comparison: this theta is “~4×” the 0.1% benchmark (as interpreted by the speaker).

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Risk / performance cautions and expectations

• Selling options involves losses sometimes, so returns are not guaranteed to be linear.
• Clarification:
  • Even if each trade generates ~0.1% theta/day, it does not automatically imply massive compounded annual returns (e.g., 500%).
• Portfolio reasoning:
  • With a portfolio of multiple trades/underlyings/strategies, theta can “backstop” directional losses.
  • Expect good days and bad days, but consistent theta generation may help over time.
• Portfolio framing:
  • A diversified approach can be viewed as a “theta machine”—selling options across many positions to smooth outcomes through continuous time decay.

Risk management warning (verbatim meaning):

• “Please do not take any more risk than you are comfortable with.”
• No guarantees are implied; losses still occur.

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Instruments / tickers mentioned

• CMCSA (Comcast)

(No other tickers/assets were explicitly mentioned.)

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Disclaimers (verbatim meaning)

• Not a trade recommendation: “Remember, none of this is a trade recommendation.”
• User responsibility: If you do this stuff, it’s “on you.”
• Risk caution: Do not take more risk than you’re comfortable with.

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Presenters / sources

• Presenter name not provided in the subtitles (speaker refers to themselves as “Tom,” but no last name/source is given).