A reading above 50 on the PMI indicates growth.
The services Purchasing Managers' Index dropped slightly more-than-expected to 53.4 from 53.8 in May.
IHS Markit said companies anticipating output growth over the next 12 months had mentioned favourable laws on regulation, a robust economic environment and positive sales forecasts as reasons to be cheerful.
In related news, Director William E. Ford sold 1,400,000 shares of the company's stock in a transaction that occurred on Thursday, April 20th. And while the PMI overestimated growth in the first three months of the year, it excludes the retail sector - which performed poorly in the first quarter but looks likely to have recorded a stronger performance in the second.
The powerhouse industry, which accounts for around 78% of the United Kingdom economy, struggled for momentum as the inflows of new business sunk to a nine-month low.
Costs for builders have also increased substantially, Markit said, with the collapse in the Brexit-hit pound resulting in sharp price hikes for imported construction materials.
Consequently, the latest rise in average prices charged by service providers was the slowest since July 2016.
The heartbeat of the United Kingdom economy slowed down sharply in June, as optimism plunged to a six-year low souring the mood in the industry, a survey released on Wednesday (5 July) by IHS Markit Economics showed.
He said: "A slowing in services sector growth completes a triple-whammy of disappointing PMI survey readings".
Greater workplace activity encouraged some services companies to recruit more staff. Employment across the sector as whole rose modestly, but at a rate that equalled May's near four-year peak. In June, the PMI stood at 51.1, up from 50.5 in May.
But while that signaled expansion, it was the second-weakest level in the past 13 months, the release said, noting that while some of the panelists surveyed said improved sales had boosted activity, others indicated subdued new order growth and difficulties securing loans weighed.
But weaker price rises fuelled domestic and foreign demand and drove the services PMI's sub-index on new business to 53.3 from 51.6 in May. "Optimism weakened at goods producers and service providers alike, hampered by concerns among some firms that the goods & services tax could harm consumer demand, with competitive pressures also seen as a threat to the outlook".