Pasadena-based Arrowhead Pharmaceuticals Inc. was this week’s biggest mover, gaining 18.54 percent to end at $1.79. Adhesive manufacturing company Flamemaster was also among this week’s biggest movers. The Los Angeles-based specialty chemical manufacturer rose 11.11 percent to end at $11. El Segundo-based direct marketing company PCM Inc. was this week’s biggest loser, dropping 31.10 percent to end at $13.12.