The healthcare player, Select Medical Holdings Corporation (SEM) , has seen its shares jump 50.2% in the year-to-date period, outpacing the industry's 47% growth. The company also outperformed the broader S&P 500 Index's return of 18.1%. Currently trading at $35.30, SEM's price is nearing the upper end of its 52-week range of $21.28 to $40.50. Given this performance so far, can investors still consider holding on to Select Medical stock, or should you book profits? SEM's YTD Price Performance Image Source: ...