Citi Research upgraded Halma Plc to a "buy" rating from "neutral" on Friday and boosted its 12-month price objective to £46 from £37 after the British safety and environmental technology group’s stock dropped sharply on guidance for fiscal year 2027.
Shares fell by more than 15% after Halma published FY27 guidance that indicated a moderation in photonics growth, a move Citi said erased about £2.70 billion from the company’s market capitalisation. The broker described the market reaction as having effectively stripped out a "photonics premium," creating what it called "asymmetric upside risk" for investors.
Citi noted that Halma's guidance showed photonics growth at approximately 30% in fiscal year 2027, down from approximately 50% in fiscal year 2026. The brokerage said the guidance is grounded in the visibility the company has on its order book, while also observing that Halma had a history of revising photonics guidance upward over the prior fiscal year.
New disclosures from the company narrowed the description of its photonics product to optical switches manufactured for a single hyper-scaler customer. According to Citi, a commercial confidentiality agreement prevents Halma from providing further detail on that engagement.
The sharp decline in Halma’s share price translated into a compression of the group’s enterprise value to sales multiple, which Citi calculates fell from 6.4 times to 5.2 times. That 5.2 times multiple sits in line with the 2022-2023 average that Citi characterises as the "pre-photonics" norm.
Within the group valuation, Citi estimated the implied multiple assigned to the photonics business declined from about 9 times revenue to about 5 times. By comparison, the broker noted peer photonics companies trade between 7 and 10 times revenue.
On the operational outlook, Citi raised its organic growth forecast for fiscal year 2027 by roughly 170 basis points to 11%, versus Visible Alpha consensus of 10.4%. For fiscal year 2028, Citi lifted its organic growth estimate by about 220 basis points to 10.1%, compared with consensus of 7.8%.
The brokerage also increased its operational EBITA projections, raising fiscal year 2027 and fiscal year 2028 estimates by approximately 4% and 7%, respectively.
Citi’s model puts fiscal year 2027 sales at £2.92 billion, rising to £3.22 billion in fiscal year 2028. Adjusted EBITDA is forecast at £675 million in fiscal year 2027 and £758 million in fiscal year 2028, corresponding to adjusted EBITDA margins of 23.1% and 23.6% in those years.
The £46 price target reflects a discounted cash flow valuation that assumes a weighted average cost of capital of 6.6%, a through-cycle margin of 21.8% and a terminal growth rate of 2.5%.
Citi laid out a bull case with a price target of £56, representing 43% upside to the new target, and a bear case of £30, representing 24% downside.
Halma shares were quoted at £39.28 as of June 11. Including a dividend yield of 0.6%, Citi’s figures imply an expected total return of 17.7% from that share price.
Context for market participants
For investors and analysts following industrials and technology-adjacent safety and environmental equipment stocks, the episode highlights how changes in guidance for a high-growth subsegment can rapidly alter group-level multiples. The narrowing of photonics disclosure to optical switches for a single hyperscaler client underscores customer concentration and confidentiality constraints when valuing nascent, high-growth product lines.