ITM Power: 42% Plunge from May High Exposes Tension Between State Aid and Index Dynamics

ITM Power shares fell 42% from May peak due to buy-the-rumour, sell-the-fact trade on MSCI index inclusion. Yet £86.5M in UK government grants and improved revenue forecast provide fundamental support amid macro risks.

The hydrogen electrolyser developer ITM Power closed last week at €1.48, a full 42% below the 52-week high of €2.58 it touched on 29 May. That collapse has erased much of the year's earlier euphoria — the stock had more than doubled since January — and the driving forces behind it are as much about market mechanics as they are about external macro pressures. Unlike many biotech or clean-tech pullbacks, this one has a specific, measurable catalyst: the MSCI UK Small Cap Index inclusion that went live on the same day as the year's peak.

Index inclusion is normally a neutral-to-positive event, but in ITM Power's case it turned into a textbook buy-the-rumour, sell-the-fact trade. Hedge funds and short-term traders piled into the stock ahead of the 29 May rebalancing, anticipating passive inflows from index-tracking funds. Once those funds had completed their obligatory purchases, the speculators dumped their positions, driving the share price down. Over the following 30 days the stock lost 20.75% — and the broader 42% drawdown from the high includes that index-arbitrage hangover alongside broader profit-taking and macroeconomic jitters.

Government cash provides a fundamental floor

Against this turbulent backdrop, ITM Power has secured what amounts to a ringing endorsement from the UK state. Great British Energy has injected £40m in direct equity, while the Department for Energy Security and Net Zero (DESNZ) has promised a capital grant of £46.5m — a combined £86.5m of public support. The money will fund an automated gigawatt-scale manufacturing line in Sheffield, where the company's next-generation electrolyser platform, code-named "Chronos", will be built. The grant is spread across fiscal years 2026/27 and 2027/28, and the state aid control authority published its approval report on 20 May.

That funding is not merely symbolic. ITM Power's order backlog currently stands at £152m, and the company has raised its revenue forecast for the full 2026 fiscal year to between £40m and £43m. The operating trajectory is clearly improving, even if the share price is not reflecting it in the short term. The last company-specific announcement was on 3 June, which means the stock is now almost entirely at the mercy of external drivers.

Central banks and technical levels in focus

This week the macro calendar is unusually dense. The Bank of England delivers its rate decision on Thursday 18 June, with the current base rate at 3.75%. A cut or a dovish signal would ease financing conditions for capital-intensive hydrogen projects and could provide a tailwind for ITM Power. The US Federal Reserve meets on 16-17 June, the ZEW economic sentiment index for Germany is due on 16 June, UK inflation data follows on 17 June, and retail sales round out the week on 19 June. Any of these could shift risk appetite and either prolong the sell-off or trigger a relief rally.

Technically, the stock is trading below its 50-day moving average of €1.64, which now acts as the first resistance level on any bounce. The 100-day moving average sits at €1.19, and the 200-day average at €1.01 — representing a further 30% decline from current levels. The relative strength index stands at 39.5, approaching oversold territory but not yet there. The 30-day annualised volatility of nearly 96% underscores just how violently the shares have swung.

For investors who bought at the start of the year, the stock still shows a triple-digit gain. But for those who piled in during the index-anticipation rally in May, the pain is acute. The question now is whether the supportive fundamentals — government backing, a rising order book, and a tangible industrialisation plan — will eventually reassert themselves over the market mechanics that have driven this correction. The next few days of macro data and central bank signals could provide the answer.