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3i is a British investment company that buys stakes in private businesses, mainly mid-sized ones in Europe and North America, and makes money when those businesses grow and are eventually sold.
3i is one of Britain's oldest private equity investors, and today it does one main thing: it takes money — its own and money from investors who back its funds — and uses it to buy big stakes in private companies, usually mid-sized firms in Europe and North America. It holds those stakes for years, helps management grow the business, and then sells out at a profit. It also runs a smaller infrastructure arm that owns things like toll roads, airports, and energy assets. It is based in London, though most of its value today comes from outside the UK.
The engine of the whole firm is a single investment: Action, a Dutch discount store chain that sells cheap household goods, cleaning products, and toys. 3i first put money into Action in 2011 and has kept buying more of it ever since. Action has grown into a huge, fast-expanding retailer with thousands of stores across Europe, and the value of 3i's stake has ballooned far beyond what it originally paid. That one holding is now worth more than the rest of 3i's portfolio combined, which is the firm's greatest strength and its biggest risk. If Action keeps growing, 3i looks brilliant; if Action stumbles, the whole company feels it. Beyond Action, 3i owns a mix of mid-sized businesses in sectors like healthcare, business services, and consumer goods, plus the infrastructure portfolio of toll roads and similar assets. The money machine works like this: 3i collects fees for managing the funds it runs, it earns a share of the profits when investments are sold, and it makes gains on its own balance sheet money. Its long-term track record has been strong, and it has turned that into a growing stream of dividends for shareholders.
After the war, Britain had a problem: small businesses with good ideas could not get long-term money. Big banks would lend for the short term, but nobody wanted to tie up cash for years in a small firm. So the Bank of England and the big five banks created the Industrial and Commercial Finance Corporation to fill that gap, partly because the banks wanted to head off the government stepping in and doing it for them.
For decades the company stuck to small and medium firms. Then it bought its sister company, which lent to big corporations, and the two became Finance for Industry. The brief now covered companies of every size.
Finance for Industry got a new name, Investors in Industry, which everyone shortened to 3i. In the eighties it became a big name in management buyouts, backing managers who wanted to buy the business they ran, and it started opening offices abroad.
Up to now the banks owned the company. That year they sold their stakes and it became a public limited company, 3i Group.
The company listed on the London Stock Exchange and soon after raised its first fund from outside investors, money it could put to work alongside its own. It was no longer just a lender; it was a fund manager too.
In the late nineties money poured into venture capital and 3i raced to open offices across North America and Asia. Then the dotcom boom collapsed and the fat returns from technology companies vanished almost overnight. Being spread across many countries and having a strong balance sheet only partly softened the blow.
The global financial crisis made everything worse for private equity firms. By the end of that year, 3i's shares were trading below the price they had listed at back in 1994, at a discount of roughly three quarters.
Amid the gloom, 3i put money into a small Dutch discount chain called Action, which had a few hundred stores in three countries. It looked like a modest deal at the time, but Action would grow into the engine that drove 3i's returns for years.
Simon Borrows became chief executive and began cutting back a sprawling, decentralised investment house. One quiet but huge change: 3i could now hold its best asset for as long as it liked, instead of selling it after the usual five to seven years.
The bill for that long hold came due. Action's like-for-like sales growth slowed sharply, with France and Germany struggling, and 3i's shares plunged, down by more than half from their peak, even as the company reported a rise in net asset value per share and announced a large share buyback. Action now made up roughly 70% of the portfolio, so its problems were 3i's problems.
The honest caveat is concentration. A private equity firm is only as good as the companies it picks and the prices it pays, and 3i's fortunes are now tied unusually tightly to one retailer. The firm has repeatedly trimmed and reshuffled its portfolio to focus on fewer, bigger bets, which sharpens both the upside and the downside. In short: 3i is a patient owner of private businesses whose recent success rests almost entirely on the explosive growth of a budget store chain most shoppers outside Europe have never heard of.
Saved answer · last researched 7 Nov 2026
3i owns 65.4% of Action, the discount retailer driving most of its returns
3i is often described as an investment company, yet most of its value rides on one shop chain. It owns 65.4% of Action, a European discount retailer, after raising its stake from 57.9%. Action's 2025 net sales reached €16.0bn, and the holding contributed a gross investment return of £4,510m, so when Action grows, 3i's owners get most of the benefit. Source: Kalkine UK, data from 2026