10/15 is going to be a big date for campaign finance reporting

While all of the reporting periods end on 9/30, some of the reporting periods start on 7/5 while others start on 7/22.

All of the reports are due on 10/15, it's possible that some will be filed before then.  However, most will be filed on the 15th to minimize the amount of time opponents have to examine

From the website of the Arizona Secretary of State -