//Use the GetFundCompanies method 
var client = new BFSServiceReference.bfsapiSoapClient();

var credentials = new BFSServiceReference.Credentials()
{
    UserName = bfsusername, //Username of administrative user in your instance of BFS
    Password = bfspassword, //Password of the administrative user in your instance of BFS
};

var fundcompanies = client.GetFundCompanies(new BFSServiceReference.GetFundCompaniesRequest()
{
    Credentials = credentials,

    identify = bfsidentifier, //Identifier is a unique token for your instance of BFS

    Args = new BFSServiceReference.GetFundCompaniesArgs()
    {
        
    },
    Fields = new BFSServiceReference.GetFundCompaniesFields()
    {
        BrickId = true,
        CompanyNumber = true,
        FundCompanyName = true,
    },
});

foreach (var c in fundcompanies.Result)
{
    Console.WriteLine(c.BrickId + ", "
        + c.CompanyNumber + ", "
        + c.FundCompanyName);
}