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For some futures contracts there are "official" rollover dates, and for other futures contracts you would roll according to volume or open interest crossover.
All financial futures - this includes equity index futures, interest rate futures and currency futures - have "official" rollover days. The key to understand the necessity to roll, is the first notice day.
If you have a long futures position, there is a risk that you may get delivered, if you hold your position until expiry. This is something that you do not want. You do not want to purchase US Treasury Notes with a face value of $ 1,000,000 - but you would rather exit your futures position. Let me remind the contractual terms:
First position day: The first day on which an investor who is short futures may notify the clearing corporation of an intention to deliver the commodity or underlying.
First notice day : The first day on which a clearing house may inform an investor that it intends to make delivery of a commodity or underlying.
This means that if you hold a long position in a futures contract on first notice day, you run the risk to get delivered. Therefore you need to roll your position prior to first notice day.
For the september 10-year treasury note futures (ZN 09-13) first notice day was August 30, 2013. This is typically the day, when volume shifts to the new front month contract. You may therefore consider for interest rate futures
rollover day = first notice day and in any case you should roll prior tofirst notice day, if you do not wish to take a delivery.
The first notice day for ZN is part of the contract specifications and you can easily find it in the product calendar on the CME website.
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