Halma's stock suffered a sharp decline of 12.2% in the session, trading as low as 4,076p, after the company released its full-year results for the 12 months to March 31, 2026. The drop, which saw the shares touch a session low of 4,064p and sit well below their 52-week high of 4,902p, reflected investor unease despite headline metrics that beat consensus estimates.
On the top line, revenue climbed 15% to reach £2.58 billion, outpacing the City consensus of £2.56 billion. Adjusted earnings before interest and tax expanded by 22% to £594.5 million, exceeding the average analyst estimate of £567.9 million. The board also approved a 7% increase in the dividend, extending Halma's record of consecutive payouts, though the uplift was smaller than some analysts had modelled.
Market attention zeroed in on the company's rapidly growing photonics operation, where concentration of sales with one major hyperscaler technology customer has escalated. That single unnamed customer now represents 20% of group revenue, up from 15% a year earlier, and accounts for roughly half of the Environmental & Analysis segment's sales. Investors viewed the rising dependence on one client as a material concentration risk.
Analysts' reactions added to the pressure. Morgan Stanley lowered its price target to GBp 4,450 from GBp 4,500 while retaining an Equalweight rating. Management's own guidance for photonics growth of about 30% in FY2027 - a marked slowdown from the 52% growth recorded in FY2026 - prompted further questions about whether the segment can sustain the higher-margin contribution it delivered this year.
Panmure Liberum flagged valuation as another point of concern, noting Halma is trading at roughly 36 times 2027 earnings compared with a sector average of 22 times. That premium leaves limited cushion, the analyst house said, should performance disappoint.
The wider market provided no clear explanation for the move: the FTSE 100 opened higher on the day, buoyed by gains in China-exposed financials, miners and utilities, so Halma's fall was a company-specific event. At the same time, markets were watching the European Central Bank amid expectations of a 25 basis point policy move, a mild macro overlay to the trading session.
In summary, investors weighed several factors against otherwise solid headline results. A stretched valuation after a strong year-to-date rally, an anticipated deceleration in photonics growth, a dividend raise that disappointed some forecasts, and mounting concentration of revenue in one hyperscaler customer combined to drive a significant intraday sell-off.
Quick facts
- Share move: down about 12.2% to 4,076p, session low 4,064p
- Revenue: £2.58 billion, up 15% (consensus £2.56 billion)
- Adjusted EBIT: £594.5 million, up 22% (estimate £567.9 million)
- Dividend: increased by 7%, below some analyst expectations
- Customer concentration: one hyperscaler now accounts for 20% of group revenue (15% a year earlier)
- Guidance: management expects approximately 30% photonics growth in FY2027 versus 52% in FY2026
- Analyst moves: Morgan Stanley cut price target to GBp 4,450 from GBp 4,500 (Equalweight); Panmure Liberum highlighted a ~36x 2027 earnings multiple vs sector 22x