The FTSE 100 quarterly reviews are implemented at the close on the third Friday of the four months: March, June, September and December.
The announcement date for the review changes used to be the Wednesday after the first Friday of the month.
From March 2014 this has changed: the announcement date is now 12 business days before the implementation date.
According to the LSE the change has been made to “provide clients a longer notice period to prepare for the trades involved following each review”.
- Other articles on index changes.