Add-on acquisitions now account for 70% of total private equity deal count, up from 57% in 2017, according to McKinsey. That is not a coincidence. It is the logical response to a market where platform deals got expensive, debt got tight, and the only reliable path to strong returns was buying cheap and building big.
At Patriot Growth Capital, add-on acquisitions are core to how we construct value inside a portfolio company. This piece breaks down the mechanics: why the strategy works, what operators need to understand before they become an add-on target, and what a disciplined buy-and-build looks like in the lower middle market.
What an add-on acquisition actually is
A platform company is the first acquisition. It is the foundation: a business with stable cash flow, a competent management team, and a defensible market position. The private equity firm acquires the platform, installs its operating playbook, and then goes hunting for smaller companies in the same industry.
Those smaller companies are the add-ons. They might be direct competitors, complementary service providers, or geographic expansions of the same business model. The platform absorbs them one by one. The combined company grows faster than any single business could on its own.
Multiple arbitrage is the financial engine behind the strategy. A $3 million EBITDA business in a fragmented industry might sell for 5x. A $10 million EBITDA platform in the same industry, with scale and market share, might sell for 9x or 10x. The math is straightforward: buy at 5x, combine to reach 10x scale, exit at 9x. The difference in exit multiple on the acquired EBITDA is pure value creation that did not require organic growth.
Why the numbers favor the lower middle market
GF Data, which tracks middle market transactions between $10M and $500M total enterprise value, found that add-ons in the $10M-$25M TEV tier averaged 6.4x EBITDA in 2024. Deals in the $50M-$100M range averaged 8.5x. That is a 2.1x difference in purchase price for the same dollar of earnings.
The lower middle market is where the arbitrage is widest. Smaller businesses sell at a discount because they are harder to finance, harder to diligence, and harder to operate. Most acquirers are not set up to handle them efficiently. PE firms that build the infrastructure to source, close, and integrate $5M-$20M businesses at scale turn that friction into a competitive advantage.
The Riverside Company executed 140 add-on buyouts over three years in the lower middle market. Its managing partner Jeremy Holland put it plainly: "You can make a lot more progress quickly by buying it rather than trying to build it from the ground up." Riverside builds platforms in business services, healthcare, franchising, software, and training, targeting founder-owned businesses in the sub-$25M range. The model compounds returns faster than organic growth alone.
The financing structure that makes it work
One reason add-ons have become dominant is their financing advantage. Platform acquisitions require a new credit facility negotiated at closing. Add-on acquisitions are typically financed through the platform's existing revolving credit facility, often with delayed-draw features built in specifically for future acquisitions.
This means the PE firm avoids the cost and uncertainty of new third-party debt for each transaction. Goodwin Law's analysis of the trend confirms this: when senior debt pricing more than doubled between 2022 and 2023, add-on activity accelerated because sponsors could use existing facilities at locked-in rates instead of tapping expensive new credit markets.
GF Data's research on sub-$10M transactions in 2024 showed an average debt coverage of 5.4x, significantly higher than the broader market average. Lenders are comfortable extending capital to an existing borrower making a tuck-in acquisition because the combined business is lower risk than a standalone new credit.
For the business owner who becomes an add-on target, this financing structure affects how the deal closes. You are not waiting for a bank to approve a new loan. The buyer has the capacity to act quickly, which often matters more to a seller than an extra half-turn of valuation.
What operators need to understand before becoming an add-on target
Most add-on processes do not run through investment bankers. They come through the platform company's own industry relationships, the PE firm's deal sourcing team, or a referral from another portfolio company. Goodwin notes that smaller transactions are more often sourced organically, which helps keep multiples lower and avoids competitive auction dynamics.
That has a practical implication: if you are running a $3M-$8M EBITDA business in a sector where a PE-backed platform is active, you may already be on a target list. The firm knows who the competitors are. They are watching revenue signals, hiring patterns, and market share shifts. When they come to you, it will feel informal. It usually is.
The diligence process is also different. Goodwin's analysis points out that add-on diligence is deliberately streamlined. Buyers focus on the three to five items that actually matter for integration, rather than running a full-scope process designed for a $200M platform deal. Representations and warranties insurance is less common. Indemnification structures are traditional. Sellers need to understand that the buyer is making a judgment call on fit and execution, not running a forensic accounting exercise.
Speed matters. The buyer's integration team is already working on other add-ons. They need to close, integrate, and move on. Deal fatigue is real. Sellers who drag their feet or introduce complexity late in the process often lose the transaction not because of price, but because the buyer decides the friction cost is not worth it.
How the integration actually creates value
McKinsey's research identifies five levers PE firms use to extract value from add-on acquisitions: acquiring early in the hold period, concentrating on three to five key value drivers, building a repeatable integration process, tracking performance rigorously, and developing in-house M&A capability.
The early acquisition point deserves attention. If a PE firm buys a platform in year one of a five-year hold and then spends years two and three looking for add-ons, the combined company only has two years to realize synergies before the exit process begins. Every month of delay compresses the value creation window. Firms that execute add-ons within the first 24 months of platform ownership generate materially better returns than those that wait.
The integration process has to scale. AE Industrial Partners ran 18 add-on acquisitions over eight years before selling its Belcan engineering platform to Cognizant for $1.3 billion. That kind of programmatic execution does not happen by accident. It requires a documented integration playbook, a dedicated integration management office, and consistent post-close measurement against the thesis that justified the acquisition.
Firms that treat each add-on as a one-off project do not build the institutional capability to do it well. Firms that treat add-on M&A as a core operational competency, measured and improved with each transaction, build a machine that compounds returns across the hold period.
The market outlook heading into 2025 and beyond
The ACG Middle Market Growth analysis published in January 2025 forecasts a resurgence in platform investing as debt markets normalize. Senior debt pricing declined to an average of 8.7% in Q4 2024, down from a peak of 11.5% in Q4 2023. Banks are aggressively courting new buyout financings. The cost of platform acquisitions is coming down.
That does not mean add-on activity slows. It means the sequencing shifts. Firms that spent 2022 to 2024 building platforms through add-on campaigns will exit those platforms in 2025 and 2026, creating a wave of deal activity. The businesses that served as add-ons, now part of larger platforms, will trade at higher multiples than they would have as standalone operators.
For business owners in fragmented industries, this cycle creates both risk and opportunity. If a PE-backed platform is consolidating your market, the window to transact at a strong valuation is open now. Waiting for a "better market" may mean watching the roll-up absorb your best customers and your best employees while you hold out.
For operators considering an acquisition-led growth strategy, the data supports the model. Add-ons remain the most capital-efficient way to build scale in the lower middle market. The multiple arbitrage is real. The financing mechanics are favorable. The integration playbook is learnable.
At Patriot Growth Capital, we execute this model with veteran operators who understand how to build businesses under pressure. See how we approach the acquisition process from a seller's perspective and what makes a business worth paying a premium for.
The strategy is not complicated. Buy small businesses at low multiples. Combine them into something larger. Operate them well. Sell at a higher multiple than you paid. The discipline is in the execution, every time, on every deal.
Frequently Asked Questions
What share of total private equity deal count do add-on acquisitions now represent?
Add-on acquisitions now account for 70% of total private equity deal count, up from 57% in 2017, according to McKinsey. The increase reflects a market where platform deals became expensive and debt markets tightened.
What is multiple arbitrage and why does it matter in a buy-and-build strategy?
Multiple arbitrage is the financial engine behind add-on strategy. A 3 million dollar EBITDA business might sell for 5x, while a 10 million dollar EBITDA platform in the same sector might sell for 9x or 10x. Buying at the lower multiple and combining businesses to reach scale at the higher exit multiple creates value without requiring organic growth.
Why do add-on acquisitions carry a financing advantage over new platform deals?
Add-ons are typically financed through the platform's existing revolving credit facility, often with delayed-draw features built in for future acquisitions. This means the PE firm avoids the cost and uncertainty of new third-party debt for each transaction.
How early in the hold period should add-on acquisitions be executed?
PE firms that execute add-ons within the first 24 months of platform ownership generate materially better returns than those that wait. Delay compresses the value creation window because the combined company needs time to realize synergies before the exit process begins.
