West Los Angeles patent portfolio holding company Marathon Patent Group Inc. was this week’s biggest gainer, shooting up 12.4 percent to close at $1.72. Fulgent Genetics Inc., the Temple City-based genetic testing company, also was up big, gaining 11.8 percent to close at $11.57. The week’s biggest loser was Differential Brands Group Inc. of Commerce, which lost 16.3 percent to close at $2.35.