The following video is from Tuesday's Investor Beat, in which host Alison Southwick and Motley Fool analysts David Hanson and Mike Olsen dissect the hardest-hitting investing stories of the day.

The federal government's online insurance exchange, the centerpiece of the Affordable Care Act, launched today at In our lead story on Investor Beat, Mike and David share the stocks they think will benefit from Obamacare.

Also, the guys discuss four stocks making big moves today. Merck cuts 8,500 jobs. Zillow keeps killing it. J.C. Penney sees a dead-cat bounce. And Walker & Dunlop takes yet another hit.

Finally, David and Mike explain why they're keeping a close watch on shares of Panera Bread and Express Scripts.

Alison Southwick has no position in any stocks mentioned. David Hanson owns shares of Zillow and Walker & Dunlop. Michael Olsen, CFA owns shares of UnitedHealth Group. The Motley Fool recommends Express Scripts, Panera Bread, UnitedHealth Group, WellPoint, and Zillow and owns shares of Express Scripts, Panera Bread, Walker & Dunlop, WellPoint, and Zillow. Try any of our Foolish newsletter services free for 30 days. We Fools don't all hold the same opinions, but we all believe that considering a diverse range of insights makes us better investors. The Motley Fool has a disclosure policy.