Today's biggest winners and losers in the stock market.

On this episode of Stock Movers:
- Dassault Systemes fell the most since 2002, after the French software company published fourth quarter figures below expectations and issued weak guidance for this year.
- An artificial intelligence tool aimed at creating tax strategies sparked a selloff in wealth-management stocks like St James's Park Tuesday as investors fear the business could be at risk from automated advice.
- Barratt Redrow shares fell as much as 8.4% Wednesday after its half-year results showed increased pressure on the UK housebuilder’s profitability.