Private equity money comes from two very different places. The equity side is dominated by a handful of large institutions: public and corporate pension funds, university endowments, private foundations, sovereign wealth funds, and insurance companies, with wealthy individuals and family offices contributing a smaller share. But equity is only part of the picture. When a private equity firm actually buys a company, borrowed money typically covers 60 to 80 percent of the purchase price, which makes banks, institutional lenders, and the high-yield bond market a massive second source of capital that rarely gets the same attention.
Two Channels, Not One
A private equity fund is set up as a limited partnership. The firm running it is the General Partner (GP), and the outside investors who supply the capital are Limited Partners (LPs). Limited partners commit money to the fund; their liability is capped at what they’ve committed, and creditors of the fund or its portfolio companies can’t reach their other assets.
That committed equity is the first channel. The second is deal-level debt. When the GP buys a portfolio company, it borrows most of the purchase price against that company’s own cash flow and assets. The fund’s equity covers the rest. So the LP capital you’ll read about below is really the down payment; the total dollars flowing through private equity deals are several times larger once you count the borrowing.
Funds raise LP capital under exemptions from SEC registration, most commonly Rule 506(b) and Rule 506(c) of Regulation D. Under Rule 506(b) the fund cannot advertise and may accept no more than 35 non-accredited investors.1U.S. Securities and Exchange Commission. Private Placements – Rule 506(b) Under Rule 506(c) the fund can market broadly but must take reasonable steps to verify that every investor is accredited. Larger funds often use Section 3(c)(7) of the Investment Company Act, which allows an unlimited number of investors but requires each one to be a “qualified purchaser.”
Pension Funds
Pension funds commit more capital to private equity than any other investor type. Public retirement systems for government workers and corporate plans covering private-sector employees both manage very large asset pools with obligations that stretch decades into the future, and that time horizon matches the ten-year lockup of a typical PE fund.
Private-sector pension plans that invest in PE are subject to the Employee Retirement Income Security Act. ERISA requires plan fiduciaries to act solely in the interest of workers and retirees and to diversify plan investments.2U.S. Department of Labor. FAQs about Retirement Plans and ERISA Public pension funds aren’t technically covered by ERISA, but most follow similar fiduciary standards under state law.
One rule shapes how much pension money any single fund will accept. If benefit plan investors hold 25 percent or more of any class of equity in the fund, the fund’s underlying assets are treated as “plan assets” subject to ERISA’s fiduciary and prohibited-transaction rules.3eCFR. Definition of Plan Assets – Plan Investments That would create heavy compliance burdens on the GP, so most firms either monitor pension participation to stay under the threshold or structure the fund to qualify for an exemption.
Endowments and Foundations
University endowments and charitable foundations are among the most enthusiastic PE investors. Because these institutions are built to exist indefinitely, they can tolerate the long lockup periods that would be unworkable for anyone needing regular access to cash. Fund managers call this “patient capital.”
Private foundations also have a specific legal reason to chase higher returns. Under the Internal Revenue Code, a private foundation must distribute roughly five percent of its net investment assets each year for charitable purposes. If it falls short, the foundation faces an initial excise tax of 30 percent on the undistributed amount, and if the shortfall isn’t corrected by the end of the correction period, a second tax of 100 percent applies.4Office of the Law Revision Counsel. 26 USC 4942 – Taxes on Failure to Distribute Income To keep pace with mandatory payouts and inflation, foundations need investment returns strong enough to clear that five percent floor, and PE’s historical returns help do that.
Sovereign Wealth Funds
Sovereign wealth funds are government-owned investment vehicles that channel national surpluses, often from oil and gas revenues, into global markets. Some of the largest manage well over a trillion dollars each. They invest in private equity for the same reason endowments do: multi-generational time horizons and no need for short-term liquidity.
Because they can write very large checks, a single sovereign commitment can represent hundreds of millions of dollars. That scale gives them leverage to negotiate reduced fees and priority access to co-investment opportunities, and their participation can also help attract other investors during fundraising.
Insurance Companies
Insurers invest the premiums they collect, building an asset base large enough to cover future claims. Life insurers in particular have long-duration liabilities, sometimes decades out, which aligns well with PE fund timelines. Property and casualty insurers have shorter liability profiles but still allocate part of their general account to private equity for the return premium over public markets.
State insurance regulators cap how much of an insurer’s portfolio can sit in illiquid alternatives, so PE typically represents a modest slice of any one insurer’s book. But the industry is so large that even a small percentage translates into billions of dollars flowing into PE funds each year.
High Net Worth Individuals and Family Offices
Wealthy individuals and family offices, which are private firms that manage the finances of one or a few very wealthy families, round out the equity investor base. Their aggregate share is smaller than the institutional sources above, but they’ve been a consistent presence since the industry’s early days.
Securities law limits who can participate. At a minimum, individual investors must be accredited: net worth above $1 million excluding the primary residence, or annual income above $200,000 individually ($300,000 with a spouse) for the past two years with a reasonable expectation of the same going forward.5U.S. Securities and Exchange Commission. Accredited Investors For funds that rely on Section 3(c)(7), the bar is higher. Each investor must be a qualified purchaser, meaning an individual with at least $5 million in investments or an entity with at least $25 million under management.6Office of the Law Revision Counsel. 15 USC 80a-3 – Definition of Investment Company
When a fund uses Rule 506(c) and advertises publicly, the GP must take reasonable steps to verify that each investor actually meets the accredited threshold. Self-certification alone isn’t enough. Verification can involve reviewing tax returns or brokerage statements, or getting written confirmation from a registered broker-dealer, attorney, or CPA.7U.S. Securities and Exchange Commission. Assessing Accredited Investors under Regulation D
Fund-of-Funds
Not every qualified investor has the resources or in-house expertise to evaluate individual PE funds. A fund-of-funds pools capital from multiple investors and spreads it across a portfolio of PE funds, often 20 or more. For investors who can’t meet the minimums at top-tier funds, which can run into the tens of millions, this is a practical way in. One estimate suggests that building a comparably diversified PE portfolio directly would require commitments exceeding $1 billion.
The cost is an extra layer of fees. Fund-of-funds investors pay management fees and carried interest both to the fund-of-funds manager and to each underlying PE fund, which can meaningfully reduce net returns. Even so, fund-of-funds vehicles remain a significant channel by which smaller institutions and individuals feed capital into the PE ecosystem.
The General Partner’s Own Money
The GP puts up its own capital alongside the LPs. This commitment aligns the managers’ personal wealth with fund performance, so they share the upside and the downside with their investors. Industry research puts the average GP commitment at about 3.5 percent of total fund size, with buyout funds averaging closer to 3.9 percent and venture or growth funds around 2.7 percent. Roughly three-quarters of funds have a GP commitment below 5 percent, though a small number commit 10 percent or more.8Institute for Private Capital. Do GP Commitments Matter?
Limited partners watch this figure closely during due diligence. A meaningful GP commitment signals confidence in the strategy. A minimal one, or a commitment funded largely through management fee waivers rather than cash, can raise questions.
Borrowed Money: The Other Half of the Answer
Committed equity funds the down payment. The rest of every deal is borrowed. In a leveraged buyout, the most common form of PE transaction, debt typically covers 60 to 80 percent of the purchase price, with fund equity covering the remaining 20 to 40 percent. Leverage is the core mechanic that amplifies returns. Buy a company for $1 billion with $300 million of equity and $700 million of debt, sell it later for $1.5 billion, and the $500 million gain sits on a $300 million equity base rather than a $1 billion one.
The debt itself comes from several places. Senior secured loans from banks and institutional lenders are the largest component. High-yield bonds, sometimes called junk bonds, carry higher interest rates and sit below senior debt in the repayment hierarchy. Mezzanine financing occupies a layer between traditional debt and equity, often with equity-like features such as warrants or conversion rights. The specific mix depends on deal size, the target’s cash flow, and credit market conditions.
Importantly, the portfolio company takes on this debt, not the fund. The fund’s other investments aren’t at risk if one leveraged deal fails. But the acquired company itself has to service the debt from its operating cash flow, which is one of the most common criticisms of the leveraged buyout model.
From Commitment to Cash
An LP commitment isn’t the same as money in the fund’s account. When a limited partner commits $50 million, that cash stays with the LP until the GP calls for it. Over the fund’s investment period, usually the first five to six years, the GP issues capital calls (also called drawdowns) as it identifies deals. A typical call notice gives investors 10 to 30 days to wire the requested amount, cites the relevant provision of the partnership agreement, and shows the investor’s funded and unfunded balances. Deployment tends to be heaviest in the first three years and slows as the fund approaches full allocation.
To smooth this timing, many funds keep a subscription credit facility, which is a line of credit secured by the LPs’ unfunded commitments. The GP can draw on it to close a deal quickly and then call capital from investors afterward to repay the line. It’s a short-term bridge, not a permanent source of capital, but it has become a standard feature of modern PE operations and helps explain how a fund can commit to an acquisition before its investors have actually wired money in.