Lock Hints Vs Transaction Isolation Level

SET TRANSACTION ISOLATION LEVEL READ UNCOMMITTED

SELECT DISTINCT    
                                            T.CompanyID    
                                     FROM   #Targetlist AS T    
                                            INNER JOIN new.CompanyIndex AS CI2 WITH (NOLOCK) ON [T].[CompanyID] = CI2.CompanyID    
                                     WHERE  [CriteriaID] = @CriteriaID    
                                            AND ( @includeNonMain = 1    
                                                  OR isMain = 1    
                                                )    
                                            AND [SegmentNo] = @SegmentNo    
                                   ) AS CI ON UD.[CompanyID] = CI.CompanyID    
                WHERE   UD.[LocalIdentifierID] = @LocalIdentifierID    
                        AND [UD].[IsActive] = 1    
                ORDER BY UD.[CompanyID]