Key Takeaways
- A call option gives you the right, not the obligation, to buy an asset at a set strike price. The most you can lose as the buyer is the premium you paid, but that premium can disappear entirely.
- Tiger Brokers has launched extended-hours US options trading on its Tiger Trade platform. More trading hours means more chances to trade, but it does not make a call cheaper or less risky.
- The true cost of a call includes the premium, the time value that decays, and the gap between the buying and selling price. Understanding those pieces is core derivatives knowledge for CFA Level 1.
The Story: Options Trading Moves Outside Regular Hours
Tiger Brokers, the online brokerage listed on Nasdaq under the ticker TIGR, has announced extended-hours US stock options trading on its Tiger Trade platform for investors worldwide. In the version aimed at Australian investors, users can trade options on 24 popular US stocks, including Apple, NVIDIA and Tesla. They can do so up to two hours before the regular market opens and for 15 minutes after it closes.
The appeal is easy to see. Extra hours at the edges of the session give investors more windows to react to news, such as earnings released after the close or an overnight move in a stock they follow.
But a longer trading window raises a question every candidate should be able to answer: when you buy a call option, what exactly are you paying for, and does trading at a different time change that bill? That is the heart of this call option explained walkthrough.
Call Option Explained: Rights, Strikes and Premium
A call option is a contract that gives the buyer the right to buy an underlying asset at a fixed price, called the strike price, on or before a set expiry date. The buyer is not forced to do anything. If the market price ends up above the strike, the right is valuable. If it does not, the buyer can simply let the contract expire.
That flexibility is not free. The buyer pays an upfront amount called the premium to the seller (the writer) of the call. This premium is the maximum loss for the buyer. The seller sits on the other side of the trade, collecting the premium but taking on an obligation to deliver the asset if the buyer exercises. For a standard US equity option, one contract normally covers 100 shares, so a premium quoted per share is not the same as the cash that leaves your account.
Take a call on a stock such as NVIDIA. You are not buying the shares. You are buying a claim that only pays off if the shares rise far enough, soon enough. Two forces shape the premium: how far the stock is already above the strike (intrinsic value) and how much the market is willing to pay for the chance that it moves further before expiry (time value). The course covers how these combine and how to read them on a payoff diagram.
What a Call Actually Costs You Beyond the Premium
The quoted premium is only the first line of the bill. Time value shrinks as expiry approaches, so a call can lose value even if the stock goes nowhere. A buyer needs the stock to move in the right direction, and by enough, to come out ahead. This is why a call that looks cheap can be an expensive bet.
The second cost is the bid-ask spread, the gap between what buyers will pay and what sellers will accept. Every time you buy at the ask and later sell at the bid, you give up part of that gap. In liquid conditions the spread can be narrow. In thinner conditions it tends to widen, and that matters directly for the Tiger launch.
The third cost is opportunity and risk of timing. Buying a call because of an after-hours headline means acting quickly on incomplete information.
Why Extended Hours Change the Experience but Not the Maths
Extended hours do not change what a call is. The contract has the same strike, expiry and payoff shape. What can change is the trading environment around it, which is why the spread can matter more than the schedule.
The scope of the Australian offering is worth noting. Access covers 24 popular stocks, with a window of up to two hours before the open and 15 minutes after the close. Popular, heavily traded underlyings are where liquidity is most likely to hold up, which is a sensible place to start. Convenience and cost are separate questions, and a broker can change when you can trade without changing what the call buyer pays for time value.
What to Watch and How to Test Yourself
If extended-hours options catch on, watch whether spreads in the early and late windows stay reasonable on the eligible stocks. That detail will tell you more about real trading cost than the headline of longer hours.
For the CFA Level 1 exam, you will be expected to recognise who holds the right and who holds the obligation, identify the maximum loss and gain for each side, and describe how the underlying price, strike and time to expiry influence a call's value. Questions often hide these ideas inside short scenarios, so understanding beats memorising.
A good check is to explain, in your own words and without notes, why a call buyer can lose the whole premium even when the stock barely moves. If that is shaky, try a free 30 question mini mock from EduFite to see where your derivatives understanding stands. The full EduFite course then builds the mechanics and structured practice that turn a news item like this into exam-ready skill.
FAQ
What is a call option in simple terms?
A call option is a contract that gives the buyer the right, but not the obligation, to buy an asset at a fixed strike price on or before expiry. The buyer pays a premium for that right.
What is the most a call option buyer can lose?
The premium paid. If the underlying price does not rise enough before expiry, the call can expire worthless and the buyer loses the whole premium, but no more.
Does extended-hours options trading make calls cheaper?
No. The contract terms and the logic of pricing stay the same. Trading outside regular hours can mean fewer participants and wider bid-ask spreads, which can raise the effective cost of trading.
What did Tiger Brokers announce?
Tiger Brokers announced extended-hours US stock options trading on its Tiger Trade platform. For Australian investors, this covers options on 24 popular US stocks, from up to two hours before the regular open until 15 minutes after the close.