El Segundo-based sporting goods retailer Big 5 Sporting Goods was this week’s biggest mover, gaining 8 percent to end at $16.99. Kilroy Realty Corp. Real Estate Trust was also among the week’s movers. The DTLA real estate corporation gained 5 percent to end at $70.11. Specialty pharmaceutical company Ritter Pharmaceuticals Inc. was this week’s biggest loser, dropping 14 percent to end at $1.70.