Understand any stock in simple English
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Alstom SA
Alstom builds trains, signalling systems, and rail infrastructure, and maintains them for railway operators around the world.
Alstom makes the things that make trains run. It builds the trains themselves—from sleek high-speed models to sprawling metro cars—and it also supplies the signalling systems that tell trains when to go, stop, and switch tracks. On top of that, it designs and installs whole rail systems and then maintains them for years afterward. Its customers are the people who run railways: national rail operators, city transit authorities, and freight companies. When a city wants a new metro line or a country wants to upgrade its train fleet, Alstom is one of the handful of companies it calls.
The business works like a giant, slow-moving equipment supplier. Alstom wins a contract, often after years of bidding against rivals, then spends years building the trains or systems and delivering them. The money comes in as the project progresses, and the real prize is the long tail of maintenance contracts that follow—once you've built a fleet of trains for a city, you're the natural choice to keep them running for the next few decades. That recurring service revenue is steadier and more reliable than the lumpy, competitive business of winning new orders. Alstom's main rivals are Siemens, CRRC, and Stadler, though Stadler is private. The company has a long and sometimes turbulent history. It was a French industrial champion for decades, then ran into serious financial trouble in the early 2000s and had to be rescued by the French state. It recovered, refocused on rail, and in 2021 made a huge bet by buying Bombardier's rail division. That deal roughly doubled Alstom's size and made it the world's second-biggest rail equipment maker, but it also loaded the company up with debt and integration headaches. Alstom has since been working to pay down that debt and fix the profitability of the acquired business.
Rail is a good business to be in over the long run. Governments keep spending on public transport, and the push to cut carbon emissions makes trains more attractive than short-haul flights or cars. But it's also a tough business in the short term: contracts are huge, margins are thin, projects can run over budget, and a few big order wins or losses can swing results. Alstom sits in an industry where scale matters enormously—you need size to spread research costs and win the biggest contracts—but that same size makes the company slow to turn when things go wrong. It pays a modest dividend and has focused most of its spare cash on reducing debt in recent years.
Saved answer · last researched 14 Nov 2026
Timeline
Two Companies Become One
Alstom began in 1928 as a merger. One side was the electrical engineering arm of an Alsace machinery company, the other a French partner of the American Thomson-Houston firm. They smashed the names together, Als plus thom, and that is where Alsthom came from. It was a simple start for a company that would one day make trains and power plants.
Alsthom Drops the H
For most of its life the company was called GEC Alsthom, a joint venture with Britain's GEC. That changed in 1998, when it listed on the Paris stock exchange and officially shortened its name to Alstom.
A Turbine Brings Alstom to Its Knees
Then came the near-death moment. A design flaw in a turbine the company had acquired with ABB turned into a huge charge, and Alstom found itself drowning in more than five billion dollars of debt. The share price collapsed and liquidation looked possible. The French state stepped in with a big stake, Europe approved a rescue package, and Alstom had to sell off pieces of itself, including its shipbuilding and electrical transmission businesses, just to survive.
General Electric Bids for the Power Business
Years later, the company tried a different kind of fix: selling the problem. General Electric agreed to buy Alstom's power and grid divisions for seventeen billion dollars. The French government, protective of a strategic national industry, watched the deal closely.
A Rail-Only Company Gets a New Boss
With the energy arm gone, Alstom was now purely a rail company. In 2016 it handed the top job to Henri Poupart-Lafarge, who would lead it through its biggest bet yet.
Bombardier Makes Alstom a Giant
That bet was Bombardier Transportation. Alstom bought the Canadian train maker for five and a half billion euros, and the deal instantly pushed it into the top league of global rail manufacturing. But buying a rival is one thing; swallowing it is another. Bombardier brought old contracts, some of them losing money, and a scattered factory network that proved hard to digest.
The Bill for Growth Comes Due
The digestion turned painful. Repeated delivery delays dragged the stock down, and in 2024 Alstom was kicked out of France's top stock index, a public sign that investors doubted it could turn its huge order book into real profit. The company raised a billion euros by issuing new shares, a move that diluted existing owners, just to shore up its balance sheet.
Martin Sion Takes Over
In 2026, after nearly a decade, Poupart-Lafarge handed over to Martin Sion, a former head of ArianeGroup. Sion inherited a record order book of around ninety-five billion euros, but also the same unfinished problem: making the Bombardier expansion work, fixing deliveries, and convincing investors again, with the stock still roughly half its 2021 level.