A typical morning in Seoul is routed through a handful of family conglomerates before the commute is over. The alarm sounds on a Samsung phone. The signal carrying it belongs to SK Telecom or LG U+. The lift down from an apartment, often built and branded by a Hyundai or Samsung construction arm, opens onto a street with a GS25 on the corner, and the coffee is paid for with a Hyundai card.
That saturation is the everyday face of a statistic quoted often and understood rarely. Four of them sit far above the rest. The combined sales of Samsung, SK, Hyundai Motor and LG reached 980.5 trillion won, roughly 729 billion US dollars, in 2023. That came to 40.8 per cent of South Korea’s nominal GDP, a figure drawn from Fair Trade Commission data raised in the National Assembly by Rep. Cha Gyu-geun. Extend the count to the top thirty business groups and the share reaches 76.9 per cent.
The numbers are arresting; they also measure something other than most people assume.
What the 40 per cent actually measures
This comparison sets company revenue against gross domestic product, and the two are not the same kind of quantity. GDP measures value added: the wages, profits and taxes generated inside the country, with the cost of inputs stripped out. A sales figure includes those inputs, counts revenue earned abroad, and draws no line between a won earned in Suwon and a won earned at a chip plant in Texas.
Samsung Electronics books most of its revenue overseas.
Set side by side, then, the 40 per cent is a ratio of two quantities that do not line up. What it shows is that the conglomerates are enormous relative to the domestic economy, not that they make up 40 per cent of it. The looser numbers that circulate, that chaebols are 65 or even 80 per cent of GDP, stretch that mismatched comparison further, and are worth treating with caution.
How they grew so large
None of the big four began as what they are now. Samsung started in 1938 as a trading company near Daegu dealing in groceries and dried fish. Hyundai Engineering and Construction, the root of the group, was set up in 1947 by Chung Ju-yung, who had earlier run a car-repair shop in Seoul. LG traces to 1947 and the chemicals and plastics business of the Koo family, its name later assembled from Lucky and GoldStar. SK grew out of Sunkyong Textiles, acquired by the Chey family in the early 1950s.
What turned these companies into pillars was a decision taken by one government. After seizing power in a 1961 coup, Park Chung-hee built his industrialisation programme on private companies rather than state-owned ones, and channelled cheap credit through state-controlled banks toward families that could hit export targets. Firms that delivered got more capital and more contracts. Firms that missed could lose their financing. The Council on Foreign Relations, among others, has traced the modern chaebol directly to this arrangement.
Why concentration cuts both ways
Concentration on this scale is both the engine of the miracle and its recurring worry. The conglomerates that handed a war-ruined economy globally competitive semiconductors, cars and shipyards also leave the country heavily exposed to the decisions of a few boardrooms. Cha, presenting the Commission’s tally, made the case that leaning on a small number of conglomerates amounts to putting the eggs in one basket.
The employment data sharpens the point. Between 2019 and 2023 the big four’s combined sales rose 25.2 per cent, while their workforce grew 7.9 per cent, to roughly 746,000 people. Growth of that shape produces formidable output and exports without adding jobs at anything like the same rate, which is part of why the chaebols draw graduates from the country’s top universities and, in doing so, thin the talent available to smaller companies and startups.
A reform push under a new president
The politics of all this shifted in 2025. Lee Jae-myung, elected president in June, campaigned on curbing the conglomerates’ influence and moved quickly on corporate governance. Amendments to the Commercial Act, proclaimed in July and extended in August, broadened directors’ fiduciary duties to cover all shareholders rather than controlling owners alone, introduced cumulative voting at large listed companies, and widened the rule capping dominant shareholders’ votes when audit committees are elected. The Korea Herald reported the August bill cleared the Assembly with 180 votes as opposition lawmakers staged a boycott.
Much of this targets the “Korea Discount,” the long-standing tendency of Korean shares to trade below comparable peers elsewhere, which investors attribute partly to cross-shareholdings and circular ownership that let founding families control groups far larger than their actual stakes. Yoon Suk Yeol, Lee’s predecessor, had promised to narrow that gap before his December 2024 declaration of martial law widened it instead.
Whether the amendments reach the core of chaebol power is contested. Legal analysts have noted that they strengthen board accountability and minority-shareholder rights without dismantling the ownership structures that concentrate family control in the first place. Business groups, for their part, warned that weakening management defences could deter investment.
What to watch now is not the sales-to-GDP ratio, which will keep being quoted regardless, but whether the governance changes alter conduct inside the groups: fewer rubber-stamped board decisions, higher dividend payouts, less value routed quietly to family-controlled affiliates. Foreign inflows and share cancellations have picked up since mid-2025, and some analysts read that as early progress, though the reforms are recent and the structures they aim at are decades old.