To assist class action defense attorneys anticipate the types of cases against which they will have to defend in California, we provide weekly, unofficial summaries of the legal categories for new class action lawsuits filed in California state and federal courts in the Los Angeles, San Francisco, San Jose, Sacramento, San Diego, San Mateo, Oakland/Alameda and Orange County areas. We include only those categories that include 10% or more of the class action filings during the relevant timeframe. This report covers the time period from January 15 – 21, 2010, during which time only 31 new class action cases were filed in these California state and federal courts (due in part to the holiday). Labor law class actions often top this list by a wide margin and frequently account for more than half of the total number of new class action lawsuits filed. During this reporting period, there were only 16 new class actions alleging employment-related claims, representing 52% of the total number of new class actions filed. The only other category to break the 10% threshold involved class actions alleging violations of California’s Unfair Competition Law (UCL), which includes false advertising claims, with 8 new class action lawsuits (26% of the new class actions filed during the reporting period).