To assist class action defense attorneys anticipate the types of lawsuits against which they will have to defend in California courts, 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 29 – February 4, 2010, during which time 37 new class action cases were filed in these California state and federal courts. Readers of this Blog know that labor law class actions generally top this list by a wide margin and often account for more than half of the total number of new class action lawsuits filed during any particular week. During this reporting period, 16 new labor law class actions were filed, representing only 43% 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 12 new class action lawsuits (32% of the new class actions filed during the reporting period).