Downtown real estate developer Cadiz Inc. was the week’s biggest gainer, shooting up 18.4 percent to close at $14.80. Internet advertiser and marketer Social Reality Inc. also made a big jump. The arts district-based company gained 13.9 percent to close at $3.69. Beverly Hills-based kids entertainment outfit Genius Brands International Inc. was the week’s biggest loser, dropping 14.8 percent to $4.35.