Options â weekly vs. monthly series I am one of the old ones (think Roy Hobbs) getting back into the game. Right off I noticed there are 2 series for most stocks and indexes â a weekly (expires each Friday) and a monthly (expires third Friday of the month) series. 1. When did this start? 2. Is it for most stocks and indexes or just a select subset? 3. Is there any good reading that explains the history and/or details? 4. How far out do the weekly series go? Meaning â for the monthly you can go out years. How about the weekly? 5. Do you think there is a difference in the players in the weekly vs the monthly contracts? 6. Any comments â effective of this change on the underlying stock price? Thanks in advance for your time and effort.