Each year, the National Association of Insurance Commissioners (NAIC) updates market share information indicating the degree of market concentration in lines of business and it identifies leading insurance writers in several categories. Most categories are familiar ones — personal auto, commercial auto, workers' compensation, medical professional liability and homeowners — but then there is the catch-all of "other liability." As defined by the Insurance Information Institute, "other liability" includes coverages protecting against legal liability resulting from negligence, carelessness or failure to act that causes property damage or personal injury to others. It also includes errors and omissions, umbrella liability and liquor liability. Related: 6 homeowners insurance tips for Super Bowl party hosts For many consumers, umbrella policies provide the security of insurance protection for risks they weren't aware of, for example, host liability for parties or volunteering on their local homeowners' association board of directors. Such policies may also provide coverage when they or their family members post something on social media that results in a lawsuit. Pet owners often are advised to consider a personal liability umbrella policy to provide extra coverage in case their dog bites someone or their cat scratches a visitor. Related: 5 insider tips for increasing umbrella insurance policy sales Whether you're looking to manage risk for your business, your home or your financial assets, it's important to know which carriers have the largest market share so you can make an informed decision about where to obtain other liability coverage. Here's a look at the top 15 writers of other liability insurance by direct premiums written.