Calendar spread

 

A tent-shaped payoff around a single strike is actually the signature of a calendar spread too, and given only one strike (716C) is shown with a single date tag (8/31), that's the better read: this is a long calendar call spread (a.k.a. horizontal or time spread), not a butterfly. Let me correct the explanation.

What a Calendar Call Spread Actually Is

Unlike a butterfly (three strikes, same expiration), a calendar spread uses one strike, two different expirations:

1. Sell 1 call at the $716 strike, expiring near-term (8/31 — the date shown on your chart)
2. Buy 1 call at the same $716 strike, expiring later (a future date, not shown on this snapshot)

You collect premium from the short-dated call you sell and pay more for the longer-dated call you buy (since it has more time value), so the position costs you a net debit — your $100.50.

Why the Payoff Still Looks Like a Tent

The chart you're looking at shows the position's value at the near-term expiration (8/31) — the date the short call dies:

• If the stock lands right at $716, the short call you sold expires worthless (great for you, since you were short it), while the longer-dated call you still own retains meaningful time value. That's your peak: max profit $167.13.
• If the stock moves far below or above $716, both calls move together (deep in- or out-of-the-money), so their values largely offset each other and the extra time-value edge shrinks — that's why the tent slopes down on both sides.
• Move too far either direction and you're outside $711.57–$720.66, where the trade shows a loss — capped near your $100.50 debit, since even in the worst case you still own a real call (the long-dated one) with some value.

Why Someone Uses This Strategy

1. Profits from time decay working in your favor. The call you sold decays faster than the one you bought, especially as expiration nears — that decay differential is the whole engine of the trade.
2. A bet on "pinning," not direction. Like the butterfly, you're not betting the stock goes way up — you're betting it stays near $716 through the short expiration.
3. Lower cost than owning a long-dated call outright, because the premium collected from the short call partially subsidizes the long call's price.
4. Flexibility after the short leg expires. Once 8/31 passes, if the short call expired worthless, you're left holding the longer-dated call — you can sell it, roll it into a new short call, or let it ride.

When to Use It

• You expect the stock to stay close to a specific strike through the near-term expiration.
• You expect implied volatility on the short-dated option to fall faster than the long-dated one (common heading into a quiet period, or after a known catalyst has passed).
• You want defined, limited risk (capped at your debit) while still keeping some longer-term upside exposure via the back-month call.

When to Avoid It

• If you expect a big move before the near-term expiration — a sharp move blows through the profit zone and calendar spreads underperform.
• Calendar spreads are sensitive to implied volatility differences between the two expirations, which is a subtler risk than a simple directional trade and easy to misjudge as a beginner.

Want me to update the downloadable article file with this corrected version?