Private Equity, Explained: Funds, Firms and Operations

Key Takeaways

Form PF defines a private equity fund by exclusion: a private fund that is not a hedge, liquidity, real estate, securitized asset or venture capital fund and offers no ordinary-course redemption rights.
A private equity fund is typically a limited partnership in which LPs commit capital, a general partner controls the fund and an adviser manages it under the partnership agreement.
Funds rely on section 3(c)(1) or 3(c)(7) of the Investment Company Act; advisers register with the SEC on Form ADV, report as exempt reporting advisers or, if smaller, may be left to the states, and SEC-registered advisers may also file Form PF.
The SEC's 2023 private fund adviser rules were vacated by the Fifth Circuit on June 5, 2024; a 2026 Form PF proposal and a FinCEN rule effective January 1, 2028 are still ahead.
Each stage of a fund's life, from closings to wind-down, turns terms in the partnership agreement into calculations, notices and reports that operations teams reproduce (interpretation).

Current as of November 8, 2026. Quotations come from the statutes, rules, forms, court opinion, Federal Register documents, SEC web pages and industry guidance listed at the end; anything marked (interpretation) is ours. It covers United States federal rules only. It is not legal advice or investment advice, and it makes no claim about how private equity performs.

For the people who run a fund, private equity is a set of legal entities, a partnership agreement that says who pays what and when, and years of cash movements and reports built on those terms.

This article is for general partners, fund administrators, limited partners' operations staff and the people who build their systems: the term in the rules, fund structure and regulation, the fate of the SEC's 2023 private fund adviser rules, and the work at each stage.

The short version

Form PF defines a private equity fund by exclusion: a private fund outside the other listed fund types that offers no ordinary-course redemption rights.
A fund is typically a limited partnership: investors commit capital as limited partners, a general partner controls the fund, and an adviser manages it.
The fund relies on section 3(c)(1) or 3(c)(7) of the Investment Company Act; its adviser answers to the Advisers Act.
The Fifth Circuit vacated the SEC's 2023 private fund adviser rules on June 5, 2024, and the SEC removed them from the Code of Federal Regulations in November 2024.

What is private equity?

Private equity is investment through privately offered funds that buy stakes in companies and hold them until they can be sold, with investors' money committed for the fund's life rather than redeemable on request (our working definition). The SEC's investor site, Investor.gov, describes the core strategy: "A typical investment strategy undertaken by private equity funds is to take a controlling interest in an operating company or business—the portfolio company—and engage actively in the management and direction of the company or business in order to increase its value."

The closest thing to a regulatory definition is in the Glossary of Terms to Form PF, the confidential report certain SEC-registered advisers to private funds file: "Any private fund that is not a hedge fund, liquidity fund, real estate fund, securitized asset fund or venture capital fund and does not provide investors with redemption rights in the ordinary course."

The definition decides how a fund is reported on Form PF, not what a firm may call itself. It works by exclusion: venture capital funds are defined by reference to rule 203(l)-1 and reported separately. And a fund's terms can move it between categories: Form PF's hedge fund definition covers a fund for which "one or more investment advisers (or related persons of investment advisers) may be paid a performance fee or allocation calculated by taking into account unrealized gains", with an exception for calculations that only reduce the fee for net unrealized losses. It also covers a fund that may borrow, or take on gross notional exposure, beyond limits the definition sets, and one that may sell short other than to hedge currency exposure or manage duration. Classification turns on each fund's documents (interpretation).

How is a private equity fund structured?

A private equity fund is typically a limited partnership with three roles: investors, a general partner that controls the fund, and an adviser that manages it. The Fifth Circuit's 2024 opinion, in a background section drawn from the briefs, the record and the SEC's release, put it this way: "Each private fund is managed by an adviser—typically a firm—that often serves as a general partner, or managing partner", while "the fund's investors typically become limited partners, taking no part in management."

Under the Advisers Act, the adviser's client is the fund. The opinion, citing a D.C. Circuit case: "In the private fund context, that client is the fund itself—not the fund's investors." So investors' rights live mainly in the fund's documents, chiefly the limited partnership agreement (LPA).

Party	Role	Where the role is set
Limited partners (LPs)	The investors; Investor.gov lists insurance companies, university endowments, pension funds and high income and net worth individuals among those eligible	Subscription documents, the LPA, any side letter
General partner (GP)	Controls the fund and makes its decisions	The LPA
Adviser or management company	Manages the investments for a management fee; may be, or be affiliated with, the GP	The advisory agreement; the Advisers Act if registered or exempt reporting
Limited partner advisory committee (LPAC)	LPs that ILPA describes as "mandated to consider conflicts of interest and provide the GP with guidance"	The LPA
Service providers	Fund administrator, auditor, counsel, subscription line lenders	Engagement letters and credit agreements

How does money move through a private equity fund?

Investors commit capital, the GP calls it as investments are made, and exit proceeds flow back in the order the LPA sets. The ILPA Principles, voluntary industry guidance from the Institutional Limited Partners Association, define a commitment as "An LP's contractual obligation to provide capital to a fund, in response to capital calls from the GP for fund investments, to up to the amount specified in the subscription agreements." A capital call is "Capital that LPs have pledged to the fund that is requested and transferred from LPs to GP to finance an investment or fund expenses."

Management fee. A fixed fee for running the fund, on a base the LPA sets; Comparing Fund-Level vs. Deal-Level Fee Calculations covers the alternatives.
Waterfall. The order in which proceeds go to LPs and the GP. ILPA's stated preference: "The preferred waterfall structure distributes all committed capital back to LPs before the GP begins to accrue carried interest, also known as a whole of fund waterfall structure." Its guidance also addresses deal-by-deal waterfalls.
Carried interest. ILPA: "An agreed share of the profits resulting from the realization of an investment, accruing to the GP." It "becomes payable once investors have recouped their original investment in the fund, plus a defined hurdle rate, if applicable."
Clawback. When triggered, it "requires that the GP return to the fund's LPs an amount equal to what is determined to be “excess” distributions."

These are ILPA's definitions and preferences, not rules; the binding terms are in each fund's agreement. Fees start early and exit proceeds come later, the timing the J-curve describes. Each mechanic is a calculation reproduced from the agreement (interpretation); the buyer's guide to private equity fund accounting platforms sets out what to evaluate.

Why doesn't a private equity fund register as an investment company?

Because it relies on one of two exclusions in section 3(c) of the Investment Company Act, 15 U.S.C. 80a-3. The Advisers Act defines a private fund as "an issuer that would be an investment company, as defined in section 3 of the Investment Company Act of 1940 (15 U.S.C. 80a–3), but for section 3(c)(1) or 3(c)(7) of that Act."

Section 3(c)(1) covers an issuer whose securities are beneficially owned by no more than a number of persons the statute sets (higher for a qualifying venture capital fund) and "which is not making and does not presently propose to make a public offering of its securities."
Section 3(c)(7) covers an issuer whose securities "are owned exclusively by persons who, at the time of acquisition of such securities, are qualified purchasers", again with no public offering.

Investor.gov states the result: "Although a private equity fund may be advised by an adviser that is registered with the SEC, private equity funds themselves are not registered with the SEC." It also says a fund is typically open only to accredited investors and qualified clients, which are separate tests from the qualified purchaser standard. The exclusion is a condition to keep meeting, so eligibility is tested at onboarding and at every transfer (interpretation).

How are private equity advisers regulated?

The adviser, not the fund, is regulated, under the Investment Advisers Act of 1940. Section 203(a) makes it unlawful for an adviser to use the mails or interstate commerce in its business unless registered with the SEC, except as section 203(b) and section 203A provide; section 203A bars an adviser regulated by its home state from SEC registration unless it meets the asset or other conditions that section sets. SEC registration is on Form ADV under rule 203-1. Section 203(m) directs the SEC to exempt an adviser that "acts solely as an adviser to private funds and has assets under management in the United States of less than" a statutory threshold, and section 203(l) exempts advisers solely to venture capital funds.

Rule 204-4 calls these exempt reporting advisers and requires them to "complete and file reports on Form ADV". Registered advisers carry more. Rule 206(4)-7 requires written compliance policies, a review "no less frequently than annually" and a chief compliance officer. Under the custody rule, rule 206(4)-2, an adviser to a limited partnership audited at least annually, by an auditor meeting the rule's conditions, that distributes GAAP audited financial statements to all limited partners within the rule's deadline, and again "Upon liquidation", is relieved of the client-notice and account-statement paragraphs and deemed to comply with independent verification. On October 6, 2026 the SEC proposed amending the custody rule and redesignating it (91 FR 63870); that is a proposal only.

Rule 204(b)-1 requires a registered adviser to private funds to file Form PF once its private fund assets reach the rule's threshold "as of the end of your most recently completed fiscal year". For advisers that file Form PF, the SEC's April 2026 proposal notes: "Currently, all private equity fund advisers must submit quarterly reports about adviser-led secondary transactions, general partner removals, termination of investment periods, and fund terminations." That joint SEC and CFTC proposal, published April 24, 2026, would eliminate the quarterly event report; no final rule had been published by this article's date. Separately, the compliance date for the Form PF amendments adopted February 8, 2024 is now July 1, 2027.

FinCEN's 2024 rule setting anti-money laundering program and suspicious activity reporting requirements for registered investment advisers and exempt reporting advisers, within the scope the rule defines, now takes effect on January 1, 2028, a delay FinCEN said gives it time "to review the IA AML Rule".

What happened to the SEC's 2023 private fund adviser rules?

They were vacated. The SEC adopted them on August 23, 2023 (Release No. IA-6383), effective November 13, 2023. On June 5, 2024, the U.S. Court of Appeals for the Fifth Circuit, in National Association of Private Fund Managers v. SEC, No. 23-60471, held that "The Commission has exceeded its statutory authority in adopting the Final Rule" and concluded: "Because the promulgation of the Final Rule was unauthorized, no part of it can stand. Accordingly, we VACATE the Final Rule."

The SEC's November 19, 2024 technical amendments (Release No. IA-6773) record the effect: "vacating the new rules and the reservation of rule 206(4)–9" and "vacating the amendments to the existing books and records rule 204–2 and compliance rule 206(4)–7 such that those vacated amendments are no longer in effect." The SEC's October 31, 2024 announcement lists each vacated rule. The eCFR as of November 1, 2026 has no rule 211(h)(1)-1. Similar terms agreed in an LPA or side letter rest on the contract, so the vacatur does not remove them (interpretation).

What happens at each stage of a fund's life?

A fund moves from fundraising through exits to wind-down. The operations column is our working description (interpretation); firms split that work between their own staff and an administrator differently.

Stage	What happens	Operations and systems involved
Fundraising and formation	The GP sets terms in offering documents and the LPA; prospective LPs diligence and negotiate, sometimes through side letters	Investor records, data room, subscription review, eligibility and identity checks, entity setup in the ledger
Closings	ILPA: the first closing admits the first LPs; the final closing is "the date on which the last LP is admitted to the fund"	Commitment register, LP capital accounts, side-letter terms tracked as obligations, adviser filings updated
Investment period	ILPA: the period "during which capital can be called from LPs to fund investments"	Deal pipeline, capital call calculations and notices, receipts matched to LPs, subscription line draws, management fees
Ownership of portfolio companies	In the typical strategy Investor.gov describes, the fund engages actively in managing each company to increase its value	Portfolio data, valuation, fund accounting, LP reporting, annual audit, Form PF where required
Exits and distributions	Investments are sold; proceeds go out under the waterfall, or are recycled where the LPA allows	Waterfall and carry calculations, distribution notices, LP tax reporting, recycling against unfunded commitments
Extension and wind-down	The term may be extended under the LPA; remaining assets are sold or transferred; the fund terminates	Final waterfall and clawback test, audit upon liquidation, Form PF event reporting for fund termination where required, records retained

ILPA asks that call and distribution notices show information "including the exact amount of carried interest". For LP reporting, see the buyer's guide to investor relations and reporting platforms; for the front of the cycle, the buyer's guide to deal sourcing and CRM for private equity.

How the work is organized

One way to map this work is as value streams, each running from a trigger to a result. The Finantrix Private Equity Value Stream Catalog names, among the streams specific to private equity firms, Fund Launch to Final Close, Capital Need to Funded Capital Call, Sourced Deal to Closed Investment, and Exit Decision to Distributed Proceeds.

Questions to ask

Which exclusion does each fund rely on, and where is investor eligibility recorded and re-tested on transfers?
How is each fund classified for Form PF, and do its fee, borrowing or short-selling terms bear on that?
Is the adviser registered or exempt reporting, and which Form ADV and Form PF filings follow, on what schedule?
Which LPA and side-letter terms create calculations, and is each modeled in a system or a spreadsheet?

How we sourced this article: every quotation in it comes from the published documents listed below, and we keep saved copies of them. Rule status was checked against the eCFR and the Federal Register as of the date at the top. The working definition, the operations column and everything marked (interpretation) are our own; ILPA's Principles are voluntary guidance. If you want to question a point, get in touch through our contact page.

Sources

Frequently Asked Questions

What is the difference between a private equity firm and a private equity fund?

The fund is the pool of investors' capital, typically a limited partnership, that owns the investments. The firm is the manager: the adviser that runs the fund for a management fee and a share of profits, often acting through a general partner entity that controls the fund. Investor.gov describes investing in a private equity fund as investing in a fund managed by a private equity firm, the adviser.

Does a private equity fund have to register with the SEC?

The fund itself generally does not register as an investment company because it relies on the exclusion in section 3(c)(1) or 3(c)(7) of the Investment Company Act. Its adviser is a separate question under the Advisers Act: it registers with the SEC on Form ADV unless an exemption applies or section 203A leaves it to state registration, and advisers relying on the private fund adviser or venture capital adviser exemption still file reports on Form ADV as exempt reporting advisers.

Are the SEC's 2023 private fund adviser rules in effect?

No. The U.S. Court of Appeals for the Fifth Circuit vacated them on June 5, 2024 in National Association of Private Fund Managers v. SEC, including the related amendments to the books and records and compliance rules. SEC technical amendments dated November 8, 2024, published and effective November 19, 2024, removed them from the Code of Federal Regulations.

What is carried interest?

ILPA's glossary defines it as an agreed share of the profits from the realization of an investment that accrues to the general partner, calculated as the fund's legal documents set out and payable once investors have recouped their original investment plus any hurdle rate. The binding terms are in each fund's limited partnership agreement, including any clawback.