Bid/Ask Spread

Why should I care about bid/ask spreads?

For markets: The bid/ask spread directly affects the execution and cost of trades. All else equal, the wider the spread, the more expensive a trade is and the less likely it is that an attempt to buy or sell an asset is successfully executed. Narrow spreads usually indicate a high trading volume, reflecting a liquid market where traders can execute frequent or relatively large orders without dramatically affecting the asset’s price. Conversely, wide spreads often signal lower liquidity, posing higher trading costs and potential price manipulation risks.

For you personally: The bid/ask spread represents an immediate cost. If you're buying a stock via a market order, you pay the ask price, which is typically higher than the market price you see quoted. When selling via a market order, you receive the bid price, which is usually lower. A wider spread means you're potentially paying more to buy and receiving less when selling, which can eat into your investment returns, especially if you trade frequently.

The bigger picture: Beyond individual transactions, the bid/ask spread can influence overall market stability. In times of financial stress, spreads often widen as market makers perceive greater risk, which can exacerbate market volatility. After all, a successful trade requires matching bids with asks, and the wider apart those two sides are, the less likely the chance of a match. Understanding this dynamic can help investors better navigate complex market conditions and adjust their strategies during economic cycles.

What is bid and ask?

Bid price: The bid price is the maximum price that a buyer is willing to pay for an asset. It represents the level of demand there is. For traders and investors, understanding the bid price partly determines how much they can expect to receive when they sell their shares. For example, if the quoted bid price for a stock is $50, this is the highest price a buyer in the market is currently willing to pay for a share.

Ask price: The ask price is the minimum price at which an asset’s owner is willing to sell it. The ask indicates the supply side of the equation. Typically higher than the bid price, the quoted ask price must be met or exceeded for a sale to occur. If the ask price for a stock is $50.20, a seller in the market will not accept less than this amount per share.

What is a bid/ask spread?

The bid/ask spread represents the difference between the bid price and the ask price of an asset. This spread is an important measure in financial markets, reflecting the transaction costs not immediately apparent to new investors. Essentially, it's the difference between what buyers are willing to pay and what sellers are asking for in return. The narrower the spread, the more liquid the market is considered to be, indicating higher trading volume and stability.

For example, if a stock’s bid price (the highest price a buyer is willing to pay) is $50, and the ask price (the lowest price a seller will accept) is $50.10, the bid-ask spread would be $0.10. This gap not only reflects the current liquidity of the stock but also represents the hidden cost of executing the trade. Investors must overcome this spread to make a profit, making it an essential factor to consider when planning entry and exit strategies in the market.

Understanding the bid/ask spread equation

The bid/ask spread equation is straightforward but fundamental in understanding how securities are traded. It is calculated by subtracting the bid price from the ask price:

• Bid/ask spread = Ask price − bid price

The bid-ask spread is typically expressed as a percentage, where the spread is compared relative to the asking price.

• Bid/ask spread (%) = (Ask price – bid price) / Ask price

This simple equation offers insight into the immediate costs associated with an investment. For buyers, the spread indicates the premium paid over the highest price that other buyers are willing to offer. This helps in deciding whether to place a market order, which is executed at the current ask price, or a limit order, which sets a maximum purchase price to control costs.

For sellers, the bid/ask spread represents the minimum undercut they have to accept below the current lowest selling price to make an immediate sale. Understanding this spread is crucial for maximizing profit potential, as it helps sellers set competitive yet profitable prices.

Overall, this equation highlights the liquidity of a stock – narrow spreads often suggest a high volume of trades while wider spreads indicate lesser activity and increased transaction costs. This spread allows market participants to make informed decisions, enhancing trading efficiency and market transparency.

Bid/ask spread calculation example

Consider the scenario where a company's shares are actively traded and start the day with the highest offer to buy – the bid – at $97.50 and the lowest offer to sell – the ask – at $97.70. Assuming an equal distribution of buyers and sellers, the market price and the single figure you’d likely see on a stock price chart would sit in between the bid and ask at $97.60.

To calculate the bid-ask spread:

• Bid/ask spread = $97.70 − $97.50 = $0.20

And as a percentage:

• Bid/ask spread (%) = ($0.20 / $97.70) x 100 ≈ 0.2047%

A bid/ask spread of 0.2047% reflects positively on the stock, suggesting relatively high liquidity and low transaction costs.

What causes the bid/ask spread?

1. Asset liquidity: One of the primary drivers of the bid/ask spread is the liquidity of the asset. Assets with high liquidity, such as shares of large corporations often traded on major stock exchanges like the New York Stock Exchange or Nasdaq typically have narrower spreads. That’s because there are so many buyers and sellers at any given time, facilitating easier and quicker transactions at prices close to the market rate. Conversely, less liquid assets, like shares of small-cap companies, may typically exhibit wider bid/ask spreads (i.e. 1% to 2% of the lowest ask) due to fewer market participants and reduced trading frequency. This suggests investors will potentially have more difficulty executing large trades without impacting the asset’s price.

2. Market volatility: During periods of high market volatility, the bid/ask spread tends to widen. Uncertainty and rapid price changes create more risk for market makers, which they can try to mitigate by increasing spreads. Their hope is that a bigger buffer to what they believe is the real price will allow them to manage the increased risk of price fluctuations that occur while they hold a position.

3. Trading frequency: The frequency of buying and selling activities also affects the bid/ask spread. For stocks that are frequently traded, the spread is typically narrower. For those traded less often, the spread can be more substantial, reflecting the increased difficulty in matching buyers and sellers.

For new or short-term traders, engaging in assets with a smaller spread enhances the chances of executing trades at desirable prices without significant slippage.

What does bid/ask mean for investors?

• Immediate costs: For traders, the bid/ask spread represents an immediate transaction cost. When an investor buys a stock, they pay the ask price, which is typically higher than the bid. Conversely, selling at the bid price yields a lower return than the ask. This spread between the buying and selling price can significantly affect the overall trading cost, especially for those who trade frequently or in large volumes.
• Profit for market makers: Market makers, who facilitate trades by buying and selling from their own inventory, earn their profits primarily through the bid/ask spread. By offering to buy at the bid price and sell at the ask, they hope to cover their risk of holding stocks while profiting from the spread between these two prices. Their role is crucial in providing liquidity and enabling smooth market operations, which benefits all market participants.
• Increased profit potential: Savvy traders can take advantage of the bid/ask spread to enhance their profit potential. By understanding the factors that influence the spread – like volatility and liquidity – traders can time their market entry and exit strategically. That might involve placing limit orders instead of market orders to better control the execution price, potentially increasing profits by buying lower (near the bid) and selling higher (near the ask).

Using the bid/ask spread to your advantage

While the bid/ask spread represents an inherent trading cost, savvy traders can employ strategies to limit the loss of profits and even use the spread to their advantage. Understanding and strategically leveraging the spread can help reduce the immediate impact on trading expenses and enhance overall investment returns.

Order strategically

One effective way to navigate the bid/ask spread is by using strategic order types. Limit orders allow traders to specify the maximum price they're willing to pay (buy limit) or the minimum they're willing to accept (sell limit). This control can help traders capitalize on narrower spreads during periods of high liquidity, potentially reducing costs and improving entry and exit points. These parameters help traders avoid the pitfalls of market orders that might execute at less favorable prices due to wide spreads.

Prioritize liquidity

Liquidity should be a key consideration when placing trades, as it directly affects the bid/ask spread. Highly liquid stocks generally have tighter spreads due to the high volume of buyers and sellers, which leads to more competitive pricing and easier trade execution. Before making trades, investors should assess the liquidity of their target securities. Trading in high-volume periods can ensure more efficient transactions and potentially lower costs due to narrower spreads.

Think long-term

The impact of the bid/ask spread diminishes with long-term investment horizons. Short-term traders might feel the pinch of the spread more acutely as they frequently enter and exit positions, incurring costs each time. In contrast, long-term investors can minimize the relative cost of the spread as these become a smaller part of the total return over time. Long-term strategies often benefit from focusing on the broader market movements and fundamental values of investments rather than immediate fluctuations caused by spread changes.