sample.cs

// persissted data
public class Company{
    public int Id {get; set}    
    public string Name {get; set}    
}

public class ProductContext : DbContext 
{ 
    public DbSet<Company> Companies { get; set; } 
}

//....
public class CompanyBusinesObject 
{
    public Company Identity {get; set}  
    public decimal Revenue  {get; set}
}