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Filed under: Earnings, Retail, Biotechnology, Restaurants, Investing Richard Drew/AP Plenty of stocks go up and down in any given week. The gainers inspire us to keep investing. The decliners keep greed in check while reminding us about the risks of the equity markets. Let’s go over some of last week’s best and worst performers. Shake Shack (SHAK) — Up 34 percent last week The fast-growing burger chain soared on reports that a related entity has taken out a trademark for the Chicken Shack name. Shake Shack has plenty of room to grow as a burger chain, but if it’s launching a sister concept specializing in poultry — likely chicken sandwiches — it can make things even more interesting for one of the hottest IPOs of the past year. Red