The stock got a boost after Reuters reported that activist investor Jana Partners has scooped up a 6% stake in the equipment-rental company.
Nik Mittal, one of Jana's partners, spoke at the 2015 Carter Burden Investment Conference on Thursday, according to the report, and said the company was a leader in "equipment rental."
During the first quarter, the company's rental revenue rose 11.9%, while owned equipment rental revenue jumped 12%.
The stock closed Friday at $91.44, up $1.72. The shares are down about 10% year to date, compared with a 1.7% gain for the Standard & Poor's 500 Index.
The shares trade at 14 times last year's earnings. Among the analysts who cover the stock, 70% rate it at buy, 20% at hold and 10% at sell, according to Bloomberg.