JP, be sure to look at the 'Major Holders' link for WTW, and once there look at the 'Top Institutional Holders' table. There you will see the 51.66% stake held by Artal (as of late September '12), which is an important fact to understand about this company. That stake has not changed recently. It would create a big buzz if Artal decided to change its stake, especially below the 50% mark...
Maybe because they suspected Jessica Simpson was pregnant?
Seriously, Credit Suisse has a report out on WTW today (maybe yesterday), and I quote "Given the
recent pullback following the unconfirmed reports about Jessica Simpson’s pregnancy, ..." And CS likes WTW.
And there hasn't been a lot of insider selling. Just a little option activity, with offsetting buys and sells.