nvr stock has been flat in recent months and matthew b kelpy the home builder’s chief accounting officer and controller bought shares days after a mixed earnings report nvr ticker nvr stock’s yeartodate gain of 20 stands just below the 22 rise in the sp 500 index but the shares have been flat for the past six months september housing starts and permits were disappointing supply bottlenecks have been hurting the entire industry keybanc capital markets analyst kenneth r zener saw “diminished earnings momentum”