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SIG makes aseptic carton packaging systems that let food and drink companies fill, seal, and ship products like milk and juice without refrigeration.
SIG makes the cartons that keep milk, juice, and plant-based drinks fresh for months without a fridge. It sells the packaging material, the filling machines that turn flat rolls of carton into sealed packs, and the service contracts that keep those machines running. Its customers are the big dairy and beverage companies — the ones whose names sit on the shelf — and they buy from SIG because the whole system works together: the material, the machine, and the support all come from one place.
The trick behind the carton is a thin layer of aluminum foil, which blocks light and oxygen and lets liquid sit on a warehouse shelf, or in a shipping container, for half a year and still taste fine. SIG does not make the drink, and it usually does not make the brand. It makes the thing the drink goes into and the factory equipment that fills it. Once a customer installs a SIG filling line, switching to a rival means rebuilding the line, which is why packaging companies tend to keep their customers for a long time. That sticky model has made SIG a quiet giant. It bought its way into the business in pieces — its roots go back to a Swiss company and to the former Reynolds aluminum empire — and today it is one of the few serious global players in aseptic cartons, alongside Tetra Laval and a handful of others. More recently it spent about $3.5 billion buying Ball Corporation's Ball Corporation beverage can business in 2022, pushing beyond cartons into cans for soda and beer. The deal added debt, and SIG has since been working to pay it down, which means less spare cash for shareholders in the short term.
The business is steady rather than explosive: people keep drinking milk and juice whether the economy is good or bad, and SIG collects recurring revenue from the packaging material and service that customers buy every year. Growth comes from emerging markets where more people are buying packaged drinks, and from newer categories like plant-based milk and cold coffee. The catch is that the big customers are large, price-sensitive food companies, and aluminum and paperboard costs move around. SIG is a toll booth on the world's beverage supply chain — small margins per carton, multiplied by billions of cartons.
Saved answer · last researched 15 Nov 2026