Trading in US Market
- Trading Rules
  - US Trading Hours in Australia
  - How to place an order
  - How to modify/cancel an order
  - Whether use the pre and post-market price to calculate the market value and profit or loss of your position
  - Why should the placement of market orders be restricted
  - Other limits for placing US stocks orders
  - Withholding Tax on Publicly Traded Partnerships (PTP) Securities and Trading Arrangements
  - Fractional shares trading in the US stock market
  - US stock 24-hour trading
  - US Stock Moving to T+1 Settlement
- Order Type
  - Time-in-force & pre-market & post-market
  - Limit order
  - Market order
  - Advanced orders
  - Stop limit order
  - Stop order
  - Limit if touched order
  - Market if touched order
  - Trailing stop limit order
  - Trailing stop order
  - Attached order
  - What is Algorithmic Trading for US Stocks
  - Market-on-Close order
  - What is a conditional order?
  - What are order trigger times?
  - OCO order
- Dividend Reinvestment Plan
  - Dividend Reinvestment Plan

Options
- US Stock Options Trading
  - Introduction to Options Contracts
  - Option Trading Rules
  - Stock, ETF & Index Options
  - Options Exercise and Settlement
  - Corporate actions & special situations
- How do we value your options positions?
- 390 Professional Orders Rule

Recurring Investment
- Recurring Investment for US Stocks
  - Recurring Investment Introduction
  - How to Start Recurring Investment
  - Recurring Investment FAQs
  - Recurring Investment Calculator
  - Popular Section
- Recurring Investment for Australian Stocks
  - Recurring Investment for Australian Stocks
  - How to Start a Recurring Investment Plan
  - Recurring Investment FAQs
  - Popular Section
  - Recurring Investment Calculator

Corporate actions
- View dividends details

Paper Trading
- How to place a paper order
- Stock Paper Trading Rules
- US Margin Paper Trading Account
- Portfolio Introduction

How do we value your options positions?

The value and profit or loss (P/L) of your options positions are all calculated based on the mark price. The mark price is a reference price used to determine the fair value of an option.

There are two ways to find the mark price of an option:

Go to the option's quotes page.
Check the options chain.

Mark price calculation by options type:

Options Type	Mark Price Calculation
US stock options and index options	Mark Price = (Best Bid + Best Ask) / 2

Helpful？

Star Tech Companies

No. Symbol 5D % Chg

Sign up to unlock

View More

Warren Buffett Portfolio

No. Symbol 20D % Chg

American Express

Bank of America

Log In for the Full List

View More