A trading update that forced analysts to tear up their models reveals just how deeply the market had underestimated Diploma's growth engine
Diploma PLC's (LSE:DPLM) unscheduled trading update on Wednesday morning was a statement of intent from a company that has consistently outpaced expectations, and the 17% share price surge to around 5,890p reflected just how badly the market had misjudged it.
The FTSE 100 distributor of specialist technical products told investors that adjusted operating profit for the current financial year would come in around 13% ahead of consensus, a gap so wide it suggests analyst models had fundamentally misread the drivers of the business.
The culprit, and the hero, is Peerless, the aerospace components distributor Diploma acquired in 2023.
Aerospace is one of those rare markets where demand is structurally constrained by supply rather than driven by it: backlogs at Boeing and Airbus are measured in years, not quarters, and that creates a sustained, predictable revenue stream for specialist distributors sitting in the middle of the supply chain.
Shore Capital, which maintained its 'hold' recommendation with a 5,600p fair value, upgraded its full-year adjusted operating profit estimate to £426 million and pencilled in earnings per share growth of more than 20% year on year.
Importantly, the broker noted that organic growth excluding Peerless is still running well ahead of Diploma's internal 5% growth model, which means this is not a one-division story.
The Controls operation is also performing strongly, with Windy City Wire benefiting from data centre buildout and digital antenna demand, while the defence and energy exposure of the IS Group and Clarendon businesses provides further structural support.
Eight acquisitions completed in the first half for around £130 million, at an implied 6.5 times earnings before interest and tax, add a further layer of compounding to what is already a highly cash-generative model.
The one cautionary note is that comparators in the second half are tough, with Controls and Peerless facing growth rates above 22% from a year ago, which makes a moderation in momentum almost arithmetically inevitable.
For now, though, Wednesday's update has reframed Diploma as a business firing on more cylinders than the market appreciated.