Based on your financial expertise, provide your response or viewpoint on the given financial question or topic. The response format is open.

What rules govern when a new option series is issued?
Without researching the securities in question I couldn't tell you which cycle each is in, but your answer is that they have different expiration cycles. The following definition is from the CBOE website; "Expiration cycle An expiration cycle relates to the dates on which options on a particular underlying security expire. A given option, other than LEAPS®, will be assigned to one of three cycles, the January cycle, the February cycle or the March cycle."