Options Quote Platform: The Complete Guide to Leveraging Level II Data

TL;DR： Options quote platforms display real-time bid and ask prices for call and put options. Level 2 data goes further by revealing the order size at multiple bid/ask levels, allowing traders to assess market depth. Learning how to read an option chain and making effective use of Level 2 data can help you develop more well-grounded entry and execution strategies.

Getting started with options trading begins with understanding options quotes. Behind every options quote is the market’s collective expectation about the direction of the underlying asset. For Hong Kong investors—whether trading U.S. stock options or Hong Kong stock options—choosing a fully featured quote platform and making good use of Level 2 depth data often helps improve decision-making. Below is an introduction to the basic structure of options quotes, and how to interpret and apply Level 2 data.

Understanding Options Quotes: Core Fields in the Option Chain

An options quote refers to the real-time bid/ask pricing information for an options contract shown on an exchange or trading platform. For each underlying asset, multiple contracts with different expiration dates and strike prices may trade simultaneously, forming a quote table known as the Option Chain.

When you open an options quote platform, you will usually see the following core fields:

• Call / Put：A call gives the buyer the right to buy the underlying at an agreed price, while a put gives the right to sell.
• Strike Price：The exercise price specified in the contract and the central reference point of the option chain.
• Expiration Date：The contract’s final valid date. U.S. stock options typically have weekly expirations, while Hong Kong stock options are mostly listed monthly.
• Bid / Ask：The difference between them is the bid-ask spread, an important indicator of liquidity.
• Premium：The option’s trading price. A standard U.S. stock option contract represents 100 shares, so the actual cost is the quoted price multiplied by 100.
• Open Interest and Volume：Viewed together, these help assess market activity.

Implied volatility (Implied Volatility, IV) is an important indicator in options quotes. The higher the volatility, the more expensive the premium usually is. For investors who want to understand how options differ from other derivatives, understanding IV helps you judge whether options are relatively expensive or cheap.

Level 1 vs. Level 2 Quotes

Market data is categorized into different levels based on information depth. Level 1 and Level 2 are the two most common.

Level 1 basic quotes provide the most essential information: the latest traded price, the best bid and ask, as well as the day’s volume and the open, high, and low. Most platforms provide Level 1 data by default, and some update it via manual refresh.

Level 2 depth quotesbuild on Level 1 by showing order information across multiple bid and ask levels, including bid and ask sizes at different price points, time-and-sales details, and (on some platforms) large-order details. Under the Hong Kong Exchanges and Clearing (HKEX) trading mechanism, market makers provide liquidity in the options market, and Level 2 quotes present a clearer picture of how that liquidity is distributed.

Tip：For lower-liquidity options contracts, Level 2 data is especially useful as a reference and can help you choose a limit price more precisely.

How to Interpret Level 2 Options Data

Assessing Bid-Ask Spreads and Liquidity

Bid-ask spreads in the options market are often wider than those of the underlying stock—especially for lower-volume contracts or deep out-of-the-money (Out-of-the-Money, OTM) options. By using Level 2 data to view order sizes at different levels, you can judge whether liquidity is sufficient to enter at a reasonable price.

Here’s a hypothetical example: if a U.S. stock option has a bid of 1.00 and an ask of 1.50 (a 50% spread), and Level 2 shows multiple large orders at 1.05 and 1.45, an investor may consider placing a limit order at a mid price. Learning more about how to use limit orders vs. market orders can help reduce slippage costs.

Reading Signals from Large Orders

If Level 2 data shows an unusually large single order, it may reflect institutional intent to enter. However, some large orders are “spoof” orders—placed with the intention of being canceled before execution to influence other participants’ judgment. Therefore, large-order signals should be evaluated together with other factors.

Key Differences Between Hong Kong and U.S. Options Quotes

U.S. stock options: Each standard contract represents 100 shares and offers multiple expiration choices, including weekly and monthly expirations. Under the National Best Bid and Offer (NBBO) rule, the bid/ask investors see reflects the best quotes available across all exchanges in the market.

Hong Kong stock options: The trading mechanism is administered by HKEX. Stock options generally expire once per month, and the contract unit corresponds to one board lot of the underlying stock (which varies by stock). The market maker system provides liquidity, but some less-traded contracts have relatively limited liquidity, so you should pay attention to bid-ask spreads to avoid excessive slippage.

Longbridge Securities provides U.S. and Hong Kong options trading services. You can learn more about tradable instruments on the investment products page, or track real-time quotes via Longbridge market data tools.

Frequently Asked Questions

What is the bid-ask spread, and how does it affect options trading?

The bid-ask spread is the gap between the highest bid and the lowest ask, and it directly adds to trading costs. Lower-liquidity options contracts usually have wider spreads, so you should check this before trading.

How does Level 2 data help with options trading in practical terms?

Level 2 lets investors see orders across multiple bid/ask levels, helping them judge whether entering at a specific limit price is feasible and assess liquidity depth. It is a supporting tool for evaluating entry timing.

How does implied volatility (IV) affect options quotes?

The higher the implied volatility, the more expensive the option premium usually is. Investors can compare IV across different expirations or strike prices for the same underlying, but should note that this is only market expectations and does not guarantee actual price direction.

Summary

From Level 1 basic quotes to Level 2 depth data, each layer provides a more complete view. Learning how to read an option chain and using Level 2 to optimize execution strategy are important preparations for participating in the options market.

Which tool to choose depends on your investment objectives, risk tolerance, market view, and experience level. No matter which investment instrument you choose, you must fully understand how it works, its risk characteristics, and trading rules, and establish a robust risk management plan. You can learn more about investing through Longbridge Academy or by downloading the Longbridge App.