In the following video, Motley Fool research analyst John Reeves talks about three companies that made major gains this week. He tells us how strong demand in the 3-D printing industry has meant expanded earnings for 3D Systems (NYSE:DDD), how HomeAway (UNKNOWN:AWAY.DL), an online marketplace for the vacation rental industry, popped after Barclays raised its rating on the stock, and how General Motors (NYSE:GM) jumped up after announcing this week it would be buying back 200 million shares from the federal government.

John Reeves has no positions in the stocks mentioned above. The Motley Fool owns shares of HomeAway, 3D Systems, and Stratasys and has options on 3D Systems. Motley Fool newsletter services recommend HomeAway, 3D Systems, General Motors, and Stratasys. 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.