Private Equity Firm Explained (2026): What PE Does, How It Buys Businesses, and Who the Top Firms Are
Quick Answer
A private equity (PE) firm is an investment management company that raises capital from institutional investors (pension funds, endowments, sovereign wealth funds, family offices, insurance companies) and high-net-worth individuals, deploys that capital into private company acquisitions, operates and grows those companies over a 3-7 year hold period, then sells them for a return. The US PE industry in 2026 manages ~$4.5T+ in assets across ~9,000+ active firms, with ~$1T+ in dry powder waiting to be deployed. The largest US PE firms by AUM are Blackstone (~$1.1T+), Apollo Global Management (~$700B+), KKR (~$580B+), Carlyle Group (~$430B+), Brookfield Asset Management (~$925B+, includes infra+RE), Bain Capital (~$185B+), Ares Management (~$465B+), Warburg Pincus (~$85B+), TPG (~$240B+), Advent International (~$92B+), Vista Equity Partners (~$100B+), Hellman & Friedman (~$120B+), and Thoma Bravo (~$160B+). PE firms acquire businesses through (1) platform acquisitions (initial purchase of an industry-leading business at $50M-1B+ enterprise value), (2) add-on acquisitions (tuck-in deals to existing platforms, typically $5-100M, ~75% of US PE deal count in 2024-25), (3) buyouts (LBOs using 50-65% senior + mezz debt), and (4) growth equity (minority stakes in faster-growing businesses). For sellers, working with PE means understanding the platform vs. add-on distinction, the role of rollover equity (often 10-40% of consideration), and the 3-7 year exit horizon. For buyers (LP investors, family offices doing co-investments, executives joining PE-backed platforms), PE offers institutional-grade returns (net IRRs typically 12-18% for top-quartile funds) but with 10+ year lockup. CT Strategic Partners runs retained buy-side mandates for PE platforms doing add-on acquisitions.
A private equity firm is an investment management company that buys, operates, grows, and sells private businesses on behalf of institutional investors and family offices. The US PE industry in 2026 manages ~$4.5T+ in assets across ~9,000+ active firms with ~$1T+ in dry powder.
For business sellers, PE firms are the largest single buyer category in the US lower middle market (~45% of deal count). Understanding how PE works — platform vs. add-on, rollover equity, exit horizons — matters whether you’re selling to PE or partnering with a PE platform as an add-on.
For active acquirers (operators expanding via M&A, family offices building portfolios, search funders, independent sponsors), understanding the PE ecosystem reveals where capital is flowing, what sectors are consolidating, and where strategic-acquirer competition is most intense.
This guide covers what a PE firm is, the fund structure, how PE buys businesses, the top US PE firms by sector, and how CT Strategic Partners works with PE on add-on acquisition mandates.
What this guide covers
- PE firm = investment management company raising LP capital, deploying into private-company acquisitions, holding 3-7 years, then selling for return.
- US PE industry 2026: ~$4.5T+ AUM, ~9,000+ active firms, ~$1T+ dry powder waiting to be deployed.
- Largest US PE firms by AUM: Blackstone ~$1.1T, Apollo ~$700B, Brookfield ~$925B (with infra/RE), KKR ~$580B, Ares ~$465B, Carlyle ~$430B, TPG ~$240B, Bain Capital ~$185B, Thoma Bravo ~$160B, Hellman & Friedman ~$120B, Vista ~$100B, Advent ~$92B, Warburg Pincus ~$85B.
- Acquisition types: platform (initial $50M-1B+ deal), add-on (tuck-in $5-100M, ~75% of deal count), LBO (50-65% debt), growth equity (minority stakes).
- Net IRR target: 12-18% for top-quartile funds. Hold period 3-7 years. LP lockup ~10 years.
- CT Strategic Partners runs retained buy-side mandates for PE platforms doing add-on acquisitions.
| Named M&A activity | Sponsor / acquirer | Year | Notes |
|---|---|---|---|
| Record US PE dry powder 2024-26 | PE industry overall | 2024-26 | ~$1T+ dry powder driving competitive M&A bidding across all sectors. |
| PE add-on dominance | PE industry overall | 2022-26 | PE add-ons = ~75%+ of US PE deal count in 2024-25. |
| Healthcare PE activity peak | Bain, KKR, Welsh Carson, Ares, Webster Equity, Audax, Apax, Frazier, Tenex, Linden | 2022-26 | Healthcare services platform consolidations across specialty practices, ASCs, dental DSOs, vet specialty. |
| Tech / SaaS PE activity | Thoma Bravo, Vista, Silver Lake, Insight Partners, Francisco Partners, KKR Tech, TPG, Hellman & Friedman | 2022-26 | Tech-enabled services and SaaS PE activity at peak with 10-25x EBITDA or 4-12x ARR multiples. |
| Industrial / infrastructure PE | Brookfield, KKR Infra, Stonepeak, DigitalBridge, J.F. Lehman, Sterling, Wynnchurch, Court Square, Arsenal | 2022-26 | Infrastructure-style PE consolidations in industrial services, distribution, regulated trades. |
The buy-side process: what actually happens
How a PE firm’s fund structure works
- Step 1: Capital raise. PE firm raises a fund (e.g., $500M-$30B+) from LPs (pension funds, endowments, sovereign wealth, family offices, insurance) on a 10-year lockup.
- Step 2: Investment period (years 1-5). PE deploys capital into platform + add-on acquisitions in the fund’s stated strategy.
- Step 3: Hold period (years 1-7). Portfolio companies operate and grow under PE ownership. Active value-creation playbook (operational improvements, M&A roll-ups, geographic expansion).
- Step 4: Exit (years 3-10). Portfolio companies sold to strategic buyers, larger PE firms (secondary buyouts), IPO, or recap to extend.
- Step 5: Distribution. Proceeds returned to LPs net of management fees (~2% AUM/year) and carried interest (~20% of profits above hurdle rate).
How PE buys businesses (transaction types)
- Platform acquisition. PE acquires an industry-leading business at $50M-1B+ enterprise value to anchor a sector consolidation thesis. Examples: Apollo + Maxim Crane (crane rental), Roark Capital + Neighborly Holdings (home services franchises).
- Add-on / tuck-in acquisition. PE platform acquires complementary businesses ($5-100M) to integrate into the platform. Typical PE platforms do 3-8 add-ons over a 5-year hold. ~75% of US PE deal count.
- Leveraged buyout (LBO). PE uses 50-65% senior + mezz debt + 35-50% equity to acquire mature, cash-flow-positive businesses. Debt service paid from operating cash flow.
- Growth equity. PE takes minority stakes in faster-growing businesses (typically tech, healthcare, consumer brands) where leverage isn’t appropriate. Returns from growth, not financial engineering.
- Carve-out / divestiture. PE acquires divisions or subsidiaries from larger corporations being divested. Often complex operational separation.
What PE pays (multiples by sector)
- Healthcare services: 8-14x EBITDA (specialty practices, ASCs, dental DSOs, vet specialty).
- Tech-enabled services / SaaS: 10-25x EBITDA or 4-12x ARR (recurring revenue model).
- Regulated trades: 6-12x EBITDA (HVAC, plumbing, electrical, fire protection, security).
- Industrial services: 5-10x EBITDA (distribution, manufacturing services).
- Consumer services: 4-8x EBITDA (franchise platforms, home services, restoration).
How an M&A advisor adds value (and where they don’t)
Top US PE firms by sector specialty (2026)
- Healthcare: Bain Capital, KKR, Welsh Carson Anderson & Stowe, Ares Management, Webster Equity Partners, Audax Group, Apax Partners, Frazier Healthcare Partners, Tenex Capital Management, Linden Capital Partners.
- Tech / SaaS: Thoma Bravo, Vista Equity Partners, Silver Lake, Insight Partners, Francisco Partners, KKR Technology, TPG Capital, Hellman & Friedman, Permira, Marlin Equity Partners.
- Home services / consumer franchise: Roark Capital, Apax Partners + Goldman Sachs Asset Management, Charlesbank Capital Partners, Aurora Capital Partners, MidOcean Partners, JAB Holding Company.
- Industrial / infrastructure: Brookfield Asset Management, KKR Infrastructure, Stonepeak Infrastructure Partners, DigitalBridge, Macquarie, GIC, J.F. Lehman & Company, Sterling Group, Wynnchurch Capital, Court Square Capital Partners, Arsenal Capital Partners.
- Consumer / retail: L Catterton, Centerbridge Partners, Sycamore Partners, TSG Consumer Partners, Catterton Partners, Endeavor Capital Management.
- Financial services: Stone Point Capital, Centerbridge, Aquiline Capital Partners, Lightyear Capital, J.C. Flowers.
How PE works with add-on acquirers (CT’s mandate sweet spot)
- Most PE platforms doing add-ons have small internal corp dev teams (1-3 people) that can’t run high-volume proprietary outreach.
- Retained buy-side advisors (CT Strategic Partners and similar) run external add-on pipelines for PE platforms.
- Engagement typically lasts 12-24 months with 3-8 add-on closes per mandate.
- Sector-exclusive mandates mean the advisor doesn’t compete with itself across multiple PE clients.
- Economic alignment: retainer covers infrastructure; success fee at each closing aligns advisor with platform’s deal velocity.
How sellers should think about PE buyers
- Platform vs. add-on: selling as a platform (PE’s first investment in your sector) vs. add-on (tuck-in to existing PE platform) have very different valuation dynamics and structures.
- Rollover equity: PE typically requires 10-40% seller equity rollover. This is your second bite of the apple at exit.
- Exit horizon: PE will exit in 3-7 years. Plan for management transition and the next ownership cycle.
- Cultural fit: different PE firms have different operating philosophies. Vet the GP’s value-creation playbook, prior portfolio companies, and references.
Dangers and traps when buying a business
1. Treating all PE firms as identical
PE firms differ in sector specialization, value-creation playbook, hold horizon, and operating style. Vet the specific GP.
2. Misunderstanding platform vs. add-on dynamics
Selling as a platform = premium multiple but high integration scrutiny. Selling as an add-on = lower multiple but faster close.
3. Under-negotiating rollover equity
Rollover equity is your second bite of the apple. Negotiate the share class, governance rights, and tag-along rights.
4. Skipping PE references
Reference 3-5 prior portfolio company management teams on cultural fit and value-creation reality.
5. Not understanding the exit horizon
PE will exit in 3-7 years. Plan accordingly — this isn’t a permanent home.
6. Ignoring the management equity pool
Most PE-backed platforms have 5-15% management equity pools. Negotiate your share before signing.
7. Trusting deal velocity over cultural fit
Fast PE bidders aren’t necessarily the right fit. Negotiation speed isn’t the same as cultural alignment.
8. Missing the 100-day plan integration cost
PE will absorb integration cost but expects the 100-day plan to deliver. Under-funded integration kills value creation.
Our POV in 2026
The US PE industry in 2026 is at peak capital deployment with peak buyer competition. ~$1T+ in dry powder is chasing ~$2T+ in annual US M&A deal value, driving up multiples in the most-competed sectors (healthcare, recurring-revenue tech, regulated trades).
The biggest opportunity for active acquirers in 2026 is PE add-on mandate work. PE platforms need external add-on pipelines, and most don’t have internal corp dev capacity. Retained buy-side advisors can run 3-8 add-ons per platform mandate over 12-24 months.
For business sellers, PE remains the largest single buyer category. Understanding the platform vs. add-on distinction, rollover equity dynamics, and 3-7 year exit horizon is essential to negotiating well.
Preparing to acquire: 6-12 months out
- Define whether you’re working with PE as a seller, an LP investor, an add-on advisor, or a portfolio-company operator.
- If selling to PE: vet 3-5 GPs in your sector on value-creation playbook, prior portfolio companies, cultural fit, and exit history.
- If running add-on pipeline for a PE platform: engage a retained buy-side advisor (CT Strategic Partners) with sector specialization.
- Map PE firms active in your sector by AUM, fund vintage, and recent transactions.
- If selling: prepare for the platform vs. add-on conversation early. Anchor your valuation thesis accordingly.
- Pre-line QoE, legal, and tax support for any PE transaction.
- Negotiate rollover equity terms, share class, governance, tag-along, and management equity pool.
- Plan for the 3-7 year hold and the management transition / exit cycle.
- Build a 100-day post-close plan template (PE expects rapid delivery).
- Engage CT Strategic Partners for PE add-on mandates with sector specialization.
About the Author
Christoph Totter is the founder of CT Acquisitions, a buy-side advisor headquartered in Sheridan, Wyoming. We run retained buy-side mandates for PE platforms, independent sponsors, family offices, search funds, and strategic acquirers. We source off-market deals, run the diligence, and close. Connect on LinkedIn · Get in touch
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Frequently asked questions
What is a private equity firm?
A private equity (PE) firm is an investment management company that raises capital from institutional investors and high-net-worth individuals, deploys it into private company acquisitions, operates and grows those companies over a 3-7 year hold period, then sells them for a return. The US PE industry manages ~$4.5T+ in assets across ~9,000+ active firms with ~$1T+ in dry powder.
What are the largest US private equity firms?
By AUM in 2026: Blackstone (~$1.1T), Brookfield Asset Management (~$925B, with infrastructure + real estate), Apollo Global Management (~$700B), KKR (~$580B), Ares Management (~$465B), Carlyle Group (~$430B), TPG (~$240B), Bain Capital (~$185B), Thoma Bravo (~$160B), Hellman & Friedman (~$120B), Vista Equity Partners (~$100B), Advent International (~$92B), Warburg Pincus (~$85B).
How does private equity buy businesses?
PE buys businesses through (1) platform acquisitions ($50M-1B+ deals anchoring sector consolidations), (2) add-on / tuck-in acquisitions ($5-100M deals integrating into existing platforms, ~75% of US PE deal count), (3) leveraged buyouts (LBOs using 50-65% senior + mezz debt + 35-50% equity), and (4) growth equity (minority stakes in faster-growing businesses).
What multiples does PE pay?
By sector in 2026: healthcare services 8-14x EBITDA, tech-enabled services / SaaS 10-25x EBITDA or 4-12x ARR, regulated trades 6-12x EBITDA, industrial services 5-10x EBITDA, consumer services 4-8x EBITDA. Multiples are higher for recurring-revenue, scalable, low-customer-concentration businesses.
What’s the difference between a platform and an add-on acquisition?
A platform acquisition is the PE firm’s initial investment in a sector ($50M-1B+ deal anchoring a consolidation thesis). An add-on / tuck-in acquisition is a subsequent purchase ($5-100M) that integrates into the existing platform. Platforms get premium multiples but face higher integration scrutiny; add-ons get lower multiples but close faster.
What is rollover equity in a PE deal?
Rollover equity is the portion of seller proceeds reinvested as equity in the PE-acquired entity (typically 10-40% of consideration). It represents the seller’s ‘second bite of the apple’ at the PE exit 3-7 years later. Negotiate share class (preferred vs. common), governance rights, tag-along rights, and minimum coverage on dilution.
How do PE returns work?
PE funds target net IRRs of 12-18% for top-quartile vintages, with returns generated through (1) operational improvements, (2) M&A roll-ups, (3) financial engineering / leverage, and (4) multiple expansion. LPs commit capital for ~10-year lockups; returns are distributed as exits occur over the fund life.
How does CT Strategic Partners work with PE firms?
CT runs retained buy-side mandates for PE platforms doing add-on acquisitions. Sector-exclusive 12-24 month mandates with monthly retainer + success fee at each closing. We source proprietary off-market add-ons that platform corp dev teams don’t have bandwidth to find. Mandate scope typically targets 3-8 add-on closes.