Some of the biggest, most controversial deals in business history share a single structure: the leveraged buyout. It is how private-equity firms buy companies, and it is the reason a single takeover can make its backers rich or drive a household name into bankruptcy.

The basic idea

A leveraged buyout, or LBO, is the purchase of a company using a large amount of borrowed money and a smaller slice of the buyer's own cash. "Leverage" is simply the finance world's word for debt. In a typical deal, borrowed funds cover most of the purchase price and the buyer's equity covers the rest.

The defining feature is where that debt ends up. It does not sit on the buyer's books. Instead it is loaded onto the company being acquired, secured against that company's own assets and repaid out of its future cash flow. In effect, the target helps pay for its own purchase.

Who does them

LBOs are the core business of private-equity firms such as KKR, Blackstone and Apollo. These firms raise money from pension funds, university endowments and wealthy investors, pool it into a fund, then combine that equity with heavy borrowing to buy companies. They usually aim to own a business for several years before selling it to another buyer or floating it on the stock market.

The mechanics, in plain English

Once a firm owns the company, the playbook is fairly consistent: improve operations, cut costs, use the company's cash flow to pay down the debt, and eventually exit at a profit. As debt falls and profits ideally rise, the value of the owner's equity stake grows.

The appeal is that leverage magnifies returns. If you buy a business mostly with borrowed money and its value rises, the gain flows to the thin sliver of equity you actually put in, producing outsized percentage returns. But leverage cuts both ways. The same debt magnifies losses if the business stumbles, and interest must be paid whether trade is good or bad. Heavy fixed debt costs leave little room for error.

Real examples

The deal that made LBOs famous was KKR's 1988 takeover of RJR Nabisco, the tobacco and food giant, for roughly $25 billion, immortalized in the book Barbarians at the Gate. It stood as the largest buyout in history for nearly two decades.

A cautionary tale came in 2007, when a group led by KKR, TPG and Goldman Sachs bought the Texas power company TXU for about $45 billion, renaming it Energy Future Holdings. The bet relied on natural-gas prices rising. Instead, the US shale boom sent them tumbling, and the company, buckling under roughly $40 billion of debt, filed for bankruptcy in 2014.

Toys "R" Us shows the human cost. KKR, Bain Capital and Vornado bought the retailer in 2005 for $6.6 billion, most of it borrowed. Saddled with about $5 billion of debt and the interest bill that came with it, the chain could not invest enough to fight off online rivals. It filed for bankruptcy in 2017 and later liquidated, costing tens of thousands of jobs.

The criticism

Critics argue LBOs load fragile companies with debt they cannot survive, forcing job cuts and sometimes collapse. A particular flashpoint is the dividend recapitalization, in which the owners have the acquired company borrow even more money to pay themselves a dividend, pulling cash out while raising the risk that the business fails.

The other side

Defenders counter that private equity often buys under-managed or neglected businesses and imposes a discipline public markets do not. Debt, they argue, forces focus: managers must generate cash to meet payments, which can drive real efficiency. Plenty of buyouts do produce healthier, more profitable companies that are sold on at a gain.

The record, in truth, is mixed, which is exactly why LBOs remain one of finance's most debated tools. The structure is neither magic nor villainy; it is leverage, and leverage amplifies whatever happens next. This article is informational and not investment advice.