Downtown-based Breitburn Energy Partners LP was this week’s biggest mover, gaining 45 percent to close at 10 cents. Culver City-based clinical-stage immunotherapy company Nantkwest Inc. was also among the week’s big movers gaining 22 percent to close at $7.40. Hemp developer Notis Global Inc. in downtown was the week’s biggest loser, dropping 35 percent to 3 cents.