How Private Equity Works

In 2007, a private equity firm called KKR bought TXU, a Texas electricity company, for $45 billion. It was the largest leveraged buyout in history at the time. KKR put in roughly $8 billion of its own money. The rest, $37 billion, was borrowed. The debt went on TXU’s books, not KKR’s. The company was renamed Energy Future Holdings, struggled under the debt load, and filed for bankruptcy in 2014.

KKR still charged $300 million in management and advisory fees over that period.

That’s private equity in full: high ambition, enormous leverage, occasionally spectacular failure, and fees regardless of outcome.

The short answer

Private equity firms raise money from institutional investors, use it to buy companies outright (often loading the acquired company with debt to finance the purchase), improve the company’s operations or growth over several years, and then sell it at a profit. The debt is the mechanism that makes the financial returns possible. The management fees are how GPs get paid even when they don’t.

The full picture

What “private” means

When a company is public, anyone can buy shares. Its finances are disclosed quarterly. Its stock price moves every second based on what millions of investors think it’s worth.

Private equity operates in the opposite world. Private companies don’t have to file public accounts, don’t have to answer to public shareholders, and aren’t subject to the constant scrutiny of Wall Street analysts. This matters a lot for PE strategy: you can make aggressive changes to a business, restructuring, cutting divisions, pivoting the business model, without quarterly earnings calls where analysts ask uncomfortable questions.

Private equity funds buy private companies, or take public companies private. When a PE firm “takes a company private” through what’s called a go-private transaction, it acquires all the publicly traded shares, delists the company from the stock exchange, and removes it from the world of quarterly reporting and public scrutiny. This gives the PE firm a longer runway to make changes and generate returns.

The LBO: how a $4 billion company gets bought with $1 billion

The core transaction in private equity is the leveraged buyout, or LBO.

Here’s how it works. A PE firm identifies a target company, say, a manufacturing business that generates $200 million in annual free cash flow and is worth roughly $2 billion on the market. The PE firm wants to buy it.

The firm doesn’t put up $2 billion from its fund. Instead, it borrows most of the purchase price from banks, using the target company itself as collateral. A typical deal structure might look like:

• PE equity: $600 million (30% of the deal)
• Debt: $1.4 billion (70% of the deal)
• Total purchase price: $2 billion

The critical part: that $1.4 billion in debt goes onto the acquired company’s balance sheet, not the PE firm’s. The company’s own future cash flows are pledged to service the loan. The PE firm just put in $600 million of its own capital and now owns a $2 billion business.

If the PE firm can sell the company for $3 billion in five years, after paying down some debt and growing the business, the equity value could be worth $1.8 billion or more, a 3x return on the $600 million invested. Without the leverage, a $600 million investment into a $2 billion company that grew to $3 billion would only net a 1.5x return on the overall deal value. The leverage doubled the equity return.

This is the fundamental mechanism of PE: borrowed money amplifies equity returns. When it works, the returns are spectacular. When it doesn’t, when the company can’t service the debt, the company goes bankrupt while the PE firm walks away with the equity component wiped out, but having already collected fees.

The fund structure: same as VC, much bigger numbers

Private equity funds are structured almost identically to venture capital funds: LPs provide the capital, GPs manage it, and fees run on a “2 and 20” basis, 2% annual management fees plus 20% carried interest on profits.

The differences are scale and target. A large PE fund might raise $20 billion or more from pension funds, sovereign wealth funds, and endowments. The investments are not in startups but in mature companies with revenues, customers, and operating history. The target companies need to be big enough to carry the debt load, stable enough to service it, and run well enough (or poorly enough) to be worth buying.

PE fund timelines are similar to VC: capital deployed over 3 to 5 years, investments held for 4 to 7 years, full fund wind-down at year 10.

What PE firms actually do after the acquisition

Once a PE firm acquires a company, it has roughly four to seven years to generate a return before the fund needs to distribute proceeds to LPs. The clock starts immediately. What happens in that window determines everything.

Financial engineering: Refinancing existing debt, optimizing the capital structure, returning cash to the PE fund via dividends. This improves the financial returns without necessarily changing anything about the actual business.

Cost reduction: The fastest way to improve profit margins is to cut costs. This means headcount reductions, vendor renegotiations, facility consolidations, and eliminating unprofitable product lines. It’s controversial because it’s often the first thing PE owners do, and the impact on employees is immediate and real.

Revenue growth: Some PE strategies focus on growth rather than cost-cutting, expanding into new markets, hiring aggressively, acquiring complementary businesses. This is more common when the target company has strong fundamentals and the market opportunity is large.

Add-on acquisitions (the “roll-up”): A PE firm buys a platform company and then acquires smaller competitors, combining them into a larger entity. A regional chain of dental clinics might acquire 20 independent dentist offices and merge them under one brand. The combined entity often commands a higher valuation multiple than the individual pieces were worth, a phenomenon called multiple expansion. If you pay 6x EBITDA for small dental offices but can sell the combined entity at 12x EBITDA because it’s now a national chain, you’ve roughly doubled your money before the business even grew.

EBITDA: the number everything revolves around

In private equity, everything is denominated in EBITDA, Earnings Before Interest, Taxes, Depreciation, and Amortization. It’s an imperfect but useful proxy for the cash-generating power of a business, stripped of capital structure, tax jurisdiction, and accounting choices.

When a PE firm buys a company at “10x EBITDA,” they’re paying 10 times the company’s annual EBITDA. When they sell at “14x EBITDA,” they’ve achieved multiple expansion in addition to any actual earnings growth.

A company with $100 million in EBITDA:

• Bought at 10x = $1 billion purchase price
• Grown to $140 million EBITDA over 5 years, sold at 14x = $1.96 billion exit

The business grew 40% in earnings, but the exit value nearly doubled. The difference, 40% earnings growth creating 96% value growth, comes from leverage (paid-down debt magnifying equity value) and multiple expansion (selling at a higher valuation multiple than you paid).

This is the PE math that produces the industry’s best returns when it works.

Who actually owns what you use every day

PE ownership is more widespread than most people realize. If you’ve stayed at a Holiday Inn, eaten at a restaurant chain, visited a hospital, bought software for your company, or called customer support for a utility, there’s a decent chance the company was or is PE-owned.

The three largest PE firms by assets under management, Blackstone (~$1 trillion AUM), Apollo Global Management, and KKR, collectively manage more assets than the GDP of most countries. They own stakes in hundreds of companies across healthcare, logistics, real estate, financial services, media, and technology.

Blackstone’s portfolio has at one point or another included Hilton Hotels, Freescale Semiconductor, Michael Baker Corporation, and large portfolios of single-family rental homes. KKR’s portfolio has included RJR Nabisco (still the most famous leveraged buyout in history, dramatized in Barbarians at the Gate), Dollar General, and Alliance Boots.

The exit: three ways PE firms cash out

A PE investment needs to convert back to cash. There are three main paths.

IPO (Initial Public Offering): The PE firm takes the company public, allowing it to sell its shares on a public stock exchange. This is the most prestigious exit but also the most complicated. It requires the company to be large, profitable (or credibly on a path to profitability), and prepared for the scrutiny of public markets.

Strategic sale: The PE firm sells the company to a larger corporate acquirer. A software company owned by a PE fund might be sold to Salesforce or Oracle. Strategic acquirers often pay premium prices because they’re buying not just cash flows but strategic assets, customer relationships, technology, market share.

Secondary sale: The PE firm sells the company to another PE firm. This is increasingly common and has its own name: a “secondary buyout.” The math is the same, just with a new fund owning the asset.

Sometimes PE firms also do dividend recapitalizations, forcing the acquired company to take on new debt and using the proceeds to pay a dividend back to the PE fund, returning capital to LPs before any exit. It’s a way to extract value earlier, at the cost of increasing the company’s debt burden.

The fee structure problem

Private equity, like venture capital, runs on a 2 and 20 structure. But PE firms have developed a more extensive fee ecosystem on top of that.

Management fees (2%/year) cover operating costs and provide reliable income. On a $10 billion fund, that’s $200 million a year.

Transaction fees are charged when a company is acquired or sold, typically 1% of the deal value. On a $2 billion acquisition, that’s $20 million, paid by the acquired company (which the PE fund now owns).

Monitoring fees are annual charges levied on portfolio companies for “strategic oversight.” A PE-owned company might pay $3 million to $10 million per year to the PE firm that owns it.

Carried interest (20% of profits) is the primary performance incentive, GPs don’t collect this unless the fund generates returns above a hurdle rate (typically 8% annually, called the “preferred return”).

The TXU/Energy Future Holdings case illustrates the problem: the firm collected hundreds of millions in management and advisory fees even as the investment collapsed into bankruptcy. The GPs’ downside is limited. The LPs’ downside is everything they invested. The carried interest upside is shared; the fee income is not.

The controversy: does PE create or destroy value?

This is genuinely contested, and both sides have evidence.

The case for: PE-backed companies often improve faster than their non-PE peers. Buyout pressure forces operational discipline. The alignment of incentives, management given equity stakes, tends to improve focus and accountability. Research by Harvard Business School professor Josh Lerner has found that PE-backed companies show meaningful productivity improvements compared to industry peers.

The case against: Much of PE “value creation” is financial engineering, not operational improvement. Debt loads from LBOs have bankrupted companies that might otherwise have survived (see: Toys R Us, Sears, Pier 1, Payless ShoeSource). The practice of charging portfolio companies management and monitoring fees while those companies are struggling under debt service creates perverse incentives. Workers at PE-owned companies have documented worse outcomes: more layoffs, reduced benefits, and higher rates of bankruptcy.

The honest answer is that outcomes vary enormously. PE firms that buy good businesses, improve operations, and sell at reasonable multiples create real value. PE firms that load bad businesses with debt, extract fees, and walk away from the resulting bankruptcy while LPs absorb the losses do not.

Why it matters

Private equity quietly owns a significant fraction of the economy, particularly in healthcare, retail, software, and services. Understanding the incentive structure, borrowed money, a 5-to-7 year exit horizon, fee income regardless of outcome, explains a lot of seemingly puzzling behavior by PE-owned companies.

If your company gets acquired by a PE firm, expect operational pressure to improve EBITDA margins fast. If a PE-owned retailer near you closes stores aggressively, that’s cost reduction in service of margin improvement. If a PE-owned hospital seems to be cutting services that don’t generate revenue, that’s the debt clock running.

The math of PE is not mysterious. It’s leverage, operational change, and exit timing. Understanding the math helps you understand the behavior.

Common misconceptions

“Private equity is the same as hedge funds.” They’re different. Hedge funds manage liquid portfolios of publicly traded securities. PE funds buy whole companies and hold them privately. The investors, timelines, strategies, and regulatory environments are all distinct.

“PE firms risk their own money.” GPs typically invest 1% to 2% of the fund’s capital alongside LPs. The bulk of the risk is carried by the LPs. GPs’ real exposure is their reputation and future fund-raising ability, not their personal capital.

“Leveraged buyouts always destroy companies.” Many LBOs work well. Hilton Hotels was taken private by Blackstone in 2007, substantially improved its operations during PE ownership, and went public again in 2013 at a much higher valuation. The debt structure, the quality of the target company, and the operating changes made afterward all determine whether the outcome is Hilton or Toys R Us.