Diploma's reported group revenues in the first quarter ended 31 Dec increased by 10% over the comparable period last year.
At constant exchange rates, group revenues increased by 14%, with acquisitions completed during the last 12 months contributing 6% and underlying growth of 8%.
Diploma said the general strengthening of sterling in the second half of 2017 against all major currencies except the euro, had provided an overall headwind of 4% to reported group revenues.
The group said its operating margin remained in line with expectations and slightly ahead of the comparable period last year.
The group said it had made a good start to the year with overall trading in line with expectations.