How Does Time Decay (Theta) Reduce an Option's Value on Pluang?

Time decay, measured by the Greek Theta, is the rate at which a US Stock Option on Pluang loses value each day purely because time is passing — it happens even if the underlying share price does not move at all. Theta is expressed as the amount of premium an option sheds per day, all else equal; for example, an option with a Theta of -0.05 loses roughly that much in value over a single trading day. Theta erodes only the time value portion of the premium — the part priced on the probability the position turns profitable before expiry — not the intrinsic value, which is how far the option is in-the-money. Decay is not linear: on Pluang's options chain, Theta stays modest while an option is far from expiry, then accelerates sharply in the final one to two weeks. Option buyers pay this cost daily; option sellers collect it as their written position becomes cheaper to close.

• Theta vs. the other Greeks: Theta is one of the four common Greeks, alongside Delta, Gamma, and Vega, but it isolates a different force from the others — the effect of pure time passing, not a change in the underlying price (Delta) or in implied volatility (Vega).
• Intrinsic value is untouched: Because Theta only touches time value, a deep in-the-money option keeps most of its worth from intrinsic value alone even as Theta erodes its shrinking time-value sliver.
• Why days-to-expiry matters: In practice, this means the number of trading days left to expiry matters as much as direction: a thesis on Pluang that needs several weeks to play out can lose meaningful value to Theta before the underlying share ever moves in your favor, which is why days-to-expiry is worth checking alongside the strike price before opening a position.

Related questions:

Q: Does time decay affect ITM, ATM, and OTM options equally on Pluang?
No — at-the-money options usually carry the highest Theta because they hold the most time value relative to their premium, so they have the most to lose each day. Deep in-the-money options behave more like the underlying share and carry less time value, while deep out-of-the-money options already have little time value left to erode. As an option's moneyness shifts, its Theta changes too — check the contract details screen on Pluang for the current figure rather than assuming it stays constant.

Q: Can I check the current Theta value for an option before trading it on Pluang?
Yes — Pluang's options chain displays the Greeks, including Theta, alongside each contract's strike price and premium on the contract details screen. Reviewing Theta before opening a position tells you approximately how much time value that specific contract is losing per day at current conditions, which is useful for deciding how many days to expiry you actually want to hold. Theta changes as the underlying price moves and as expiry approaches, so treat the displayed value as a snapshot, not a fixed daily cost for the life of the contract.

Q: Does time decay still apply over weekends when markets are closed?
Yes — even though exchanges are closed on Saturday and Sunday, an option's premium still reflects weekend Theta. Pricing models account for calendar days rather than only trading days, so some of the decay attributed to the weekend is typically already priced into Friday's closing value or shows up as a larger drop when trading resumes Monday. This is one reason a position can lose time value between Friday's close and Monday's open even without any change in the underlying share price.

Q: Why does Theta accelerate so sharply right before an option expires on Pluang?
Time value shrinks toward zero as expiry approaches because there are fewer remaining days for the underlying price to move favorably, so the probability premium built into the contract has less time left to justify itself. This effect compounds with how Pluang handles expiry day itself: Pluang force-closes any open options position roughly one hour before market close on the expiry date, rather than letting it run to a passive settlement, so the final trading session is when whatever time value remains gets squeezed out fastest.