Understanding the Order Book on the Nigerian Exchange (NGX): A Practical Guide for Smarter Investing

Introduction

When many investors examine an NGX-listed stock, the first number they notice is its current market price.

Experienced investors often look deeper. They study the order book.

The order book provides a real-time view of the outstanding buy and sell instructions for a stock. It shows the prices at which investors are willing to buy shares and the prices at which shareholders are willing to sell them.

Understanding this information can help investors:

• Assess current buying and selling pressure
• Evaluate a stock’s liquidity
• Estimate the likely cost of executing an order
• Identify potentially attractive entry prices
• Avoid buying impulsively at an unfavourable price

The order book cannot predict the future, but it can provide valuable insight into the market’s immediate supply-and-demand dynamics.

What Is an Order Book?

An order book is an electronically maintained list of pending orders for a security.

It has two main sides:

• Buy orders, also called bids
• Sell orders, also called offers or asks

Each entry normally shows:

• The proposed price
• The number of shares available
• Sometimes, the number of separate orders at that price

For example, a buyer may indicate:

I am willing to buy 50,000 shares at ₦28.00 per share.

A seller may indicate:

I am willing to sell 30,000 shares at ₦28.20 per share.

A transaction occurs when a compatible buy order and sell order are matched under the exchange’s trading rules.

Understanding the Buy Side

The buy side displays investors waiting to purchase the stock.

Sample Buy Order Book

• ₦28.10: 850,000 shares
• ₦28.00: 1,500,000 shares
• ₦27.90: 900,000 shares

The highest price a buyer is currently willing to pay is known as the best bid.

In this example, the best bid is ₦28.10.

A large volume of bids may suggest strong buying interest. However, investors should not assume that every order will remain in the market or eventually be executed.

Understanding the Sell Side

The sell side shows shares that investors are offering for sale.

Sample Sell Order Book

• ₦28.20: 350,000 shares
• ₦28.30: 620,000 shares
• ₦28.40: 1,100,000 shares

The lowest price at which a seller is prepared to sell is called the best offer or best ask.

In this example, the best offer is ₦28.20.

A large concentration of shares at a particular price may create temporary resistance because substantial buying demand would be required to absorb the available supply.

The Bid-Ask Spread

The difference between the best bid and the best offer is called the bid-ask spread.

Using the examples above:

• Best bid: ₦28.10
• Best offer: ₦28.20
• Bid-ask spread: ₦0.10

A narrow spread generally suggests that the stock is relatively liquid and that buyers and sellers are reasonably close in their price expectations.

A wide spread may indicate:

• Limited trading activity
• Fewer active buyers or sellers
• Greater difficulty executing large orders
• A higher risk of receiving an unfavourable price

The spread is especially important when trading less-liquid NGX stocks.

A BUAFOODS Order Book Opportunity

Consider a situation in which BUAFOODS last traded at ₦845 per share, but the sell order book displays shares offered at ₦760.60.

The figures would appear as follows:

• Last traded price: ₦845.00
• Displayed sell price: ₦760.60
• Difference: ₦84.40 per share
• Percentage below the last traded price: approximately 10%

At first glance, this may appear to be an exceptional opportunity. An investor who already considers BUAFOODS fundamentally attractive may be eager to load up at ₦760.60 rather than buy around ₦845.

For example, purchasing 1,000 shares at the two prices would produce the following comparison:

• Cost at ₦845: ₦845,000
• Cost at ₦760.60: ₦760,600
• Potential saving: ₦84,400

This demonstrates why attentive investors monitor the order book. A significantly lower sell price could provide a more attractive entry point and a wider margin of safety.

However, an offer substantially below the latest traded price should be carefully verified. The displayed figure could relate to:

• A genuine seller willing to accept the lower price
• A stale or delayed market-data display
• A pre-open or auction session
• An order that has already been matched or withdrawn
• A temporary platform or data-feed discrepancy
• A price outside the permitted trading range

A smart investor does not merely notice the apparent discount. The investor confirms that the order is live, executable, and consistent with NGX trading rules before committing funds.

The lesson is not to chase every unusual figure. It is to remain alert because genuine pricing opportunities can sometimes appear in the order book.

What Can Investors Learn from the Order Book?

1. Buying Pressure

Suppose the outstanding orders show:

• Total buy orders: 8 million shares
• Total sell orders: 1 million shares

This may suggest that demand is stronger than the available supply.

If buyers continue competing for a limited number of shares, the stock price may rise. Nevertheless, order-book volume alone does not guarantee an upward movement.

2. Selling Pressure

Suppose the order book shows:

• Total buy orders: 1.5 million shares
• Total sell orders: 9 million shares

This may indicate considerable selling pressure.

If sellers become increasingly willing to accept lower prices, the stock may weaken. The situation should still be considered alongside trading volume, recent company announcements, and broader market conditions.

3. Market Liquidity

A liquid stock typically has:

• Several active buyers
• Several active sellers
• Significant volumes near the market price
• A relatively narrow bid-ask spread
• Faster order execution

In a less-liquid stock, a relatively small transaction may move the price significantly.

This is why investors should examine both the price and the available volume before submitting a large order.

4. Potential Support Levels

A large concentration of buy orders at a particular price may create temporary support.

For example:

• Buy price: ₦50.00
• Outstanding demand: 15 million shares

The large buy volume may slow a decline because sellers must first satisfy those orders before trades can occur at lower prices.

However, support can disappear if buyers cancel or revise their orders.

5. Potential Resistance Levels

A large sell order may temporarily prevent a stock from advancing.

For example:

• Sell price: ₦75.00
• Available supply: 22 million shares

The market would need sufficient buying demand to absorb those shares before the price could move convincingly above ₦75.

Market Orders and Limit Orders

Understanding the order book also helps investors choose between market and limit orders.

Market Order

A market order instructs the broker to execute the transaction at the best available price.

It prioritises speed but does not guarantee the precise execution price.

In a stock with limited liquidity, a large market order may be filled at several progressively higher prices. This is known as slippage.

Limit Order

A limit order allows the investor to specify the maximum purchase price or minimum selling price.

For example, an investor who considers BUAFOODS attractive only at ₦760.60 or below could enter a limit buy order at that price.

The order would execute only if matching shares became available, subject to the exchange’s rules and the investor’s position in the order queue.

A limit order provides greater price control, although execution is not guaranteed.

Why Order Size Matters

Investors should examine the quantity available at each price rather than looking only at the best bid or offer.

Suppose the sell side displays:

• ₦20.00: 5,000 shares
• ₦20.10: 15,000 shares
• ₦20.20: 40,000 shares

An investor seeking only 3,000 shares may be able to buy entirely at ₦20.00.

An investor seeking 50,000 shares may have the order filled across several price levels. The average purchase price would therefore be higher than the initial best offer.

This is particularly important for investors placing large orders in less-liquid NGX stocks.

Beware of Order Book Illusions

The order book is useful, but it should not be treated as infallible.

Orders may be modified, cancelled, or executed within seconds. A large displayed order does not always represent lasting demand or supply.

Investors should be cautious about:

• Large orders that repeatedly appear and disappear
• Sudden imbalances unsupported by actual trading volume
• Prices far removed from recent transactions
• Decisions based on a single snapshot
• Delayed information from a broker or data provider

The most reliable signals usually come from a combination of displayed orders and completed trades.

How Long-Term Investors Should Use the Order Book

Long-term investors do not need to monitor the order book continuously.

It is most useful when:

• Selecting an entry price
• Accumulating shares gradually
• Placing a large order
• Evaluating liquidity
• Avoiding an excessively wide spread
• Confirming whether an apparent bargain is executable
• Reducing the risk of unnecessary slippage

A strong company purchased at an unnecessarily high price can still produce disappointing returns. The order book can help disciplined investors improve their execution without changing their long-term investment thesis.

Combine Order Book Analysis with Fundamental Research

The order book reveals what market participants are trying to do now.

Fundamental analysis helps investors determine what the underlying company may be worth over time.

Before buying a stock, consider factors such as:

• Revenue and earnings growth
• Profit margins
• Cash flow
• Debt levels
• Dividend history
• Management quality
• Competitive position
• Valuation
• Sector outlook

A low sell price is not automatically a bargain. It becomes meaningful when the company is fundamentally sound and the proposed entry price offers attractive value.

Using the TopChor Nigeria Stocks Screener

The TopChor Nigeria Stocks Screener helps investors identify potential opportunities among NGX-listed companies by examining key financial and market indicators.

An investor can use TopChor to shortlist companies based on factors such as:

• Profitability
• Growth
• Valuation
• Dividend performance
• Financial strength
• Historical market performance

After identifying a promising company, the investor can examine the order book to decide how best to enter the position.

This creates a disciplined two-stage process:

1. Use fundamental and screening data to determine what to buy.
2. Use the order book to help determine when and at what price to buy.

The order book should refine an investment decision—not replace proper company analysis.

Final Thoughts

The order book is one of the most useful yet frequently overlooked tools available to NGX investors.

It can help investors understand:

• Current buying interest
• Current selling pressure
• Liquidity
• Bid-ask spreads
• Potential support and resistance
• The likely cost of executing an order

The BUAFOODS example illustrates why investors should look beyond the last traded price. A stock quoted at ₦845 may occasionally display a sell order at a much more attractive price, such as ₦760.60.

A vigilant investor may recognise the potential opportunity. A disciplined investor goes further by verifying the order, assessing the company’s fundamentals and using an appropriate limit order.

Successful investing is not simply about finding good companies. It is also about buying them at sensible prices and executing each decision carefully.