As the front month contract expiry approaches, each holder of a future's position must decide whether they need to retain the exposure provided by the future's position beyond the contract's expiry. If the answer is no, they can either close out the existing position or wait for final settlements. However, if the answer is yes, it's common practice to close out the position in the front month contracts and simultaneously open an equivalent position in the next contracts. This process known as the role allows traders to maintain their exposure without interruption by shifting it to the next contract.

Since rolling positions is a common activity in the futures market, the role is often quoted as a single price, which represents the spread between the front month and the next month contracts. Trading the role directly rather than executing two transactions separately can be beneficial because it allows traders to lock in the spread between the two contracts in a single streamlined transaction. This minimizes the risk of price fluctuations that could occur if each leg of the role was traded independently.

Here's how it works with an example to buy the role, an investor would sell the front month contract, the ESZ3 E-mini S&P 500, December 23, executed on the bid side to offset an existing long position in that contract, and buy the next contract, the March 24 contract, ESH4, executed on the ask side. In this example, selling the front month contract is done at a bid price of 4569.75, and buying the next contract is done at an ask price of 4,620. The roll therefore, can be bought at a price of 50.25 index points, which is the difference between the two contract prices of 4,620 and 4,569.75. Since you'd be buying at 4,620 and selling at 4,569.75, the net of these two is a cost.

Conversely, selling the role means buying the front month contract, executed on the ask side, and selling the next contract executed on the bid side. Using the same numbers, the investor would buy the front month at 4,570 and sell the next contract at 4,619.25. The role in this case can be sold at 49.25. Index points the difference between 4,619.25 and 4,570.

This quoted roll price provides a straightforward way for traders to understand the cost or gain associated with rolling their position from one contract to the next, allowing for more seamless management of futures positions.