How to Source Bolt-On Acquisitions for a Roll-Up Strategy

A bolt-on acquisition is a smaller company acquired after an initial "platform" purchase and folded into it, and bolt-ons now make up roughly 70% of all private equity buyout deal count. Finding them well comes down to running four channels at once: proprietary relationships, broker and banker networks, systematic industry mapping, and off-market outreach to owners who look ready to sell before they ever list. The teams winning the best bolt-ons right now are the ones reaching owners first, not the ones with the biggest research budget.

Most content on this topic is written for one of two audiences: investment-banking interview prep, or a PE-backed platform company with its own in-house origination team. Very little of it speaks to the independent sponsor, search fund, or smaller PE shop actually doing this sourcing work themselves, without a dedicated team or a six-figure software budget. This is written for that reader.

Key takeaways

• Bolt-on (add-on) acquisitions account for roughly 70 to 73% of all PE buyout deal count. If you're building a sourcing process, you're building for the deal type that dominates the market, not the exception.
• Sourcing runs on four channels at once: proprietary relationships, broker/banker networks, industry mapping, and off-market outreach to exit-ready owners. Most teams lean on one or two; the best results come from running all four in parallel.
• Fragmented, non-tech Main Street sectors, especially home services, are the hottest roll-up target right now. PE-backed HVAC add-ons rose 88% year over year through mid-2025, and two of the largest home-services deals in PE history (Blackstone's Champions Group, Apollo's Apex Service Partners investment) both closed within the last several months.
• Independent sponsors aren't a fringe category anymore. They closed the largest share of any buyer type on the Axial platform in 2025, ahead of traditional committed-capital PE funds, and most of them are sourcing without a dedicated origination team.
• The enterprise sourcing-software category (Grata, SourceScrub) just consolidated under one owner (Datasite) at price points that start around six figures a year, which pushes independent sponsors and smaller shops further toward self-serve alternatives, not away from them.

What is a bolt-on acquisition, and why are they ~70% of PE deal volume?

A bolt-on acquisition, sometimes called an add-on or tuck-in, is a smaller company a buyer acquires after an initial "platform" purchase and integrates into it, adding revenue, geography, service lines, or capability the platform didn't have on its own. The economics are straightforward: platforms typically sell at a higher earnings multiple because of their scale and management depth, while bolt-ons sell at a lower one because they're smaller and less institutional. A firm that buys a platform at 10x EBITDA and bolts on smaller companies at 8x captures that spread, called multiple arbitrage, when the combined, larger business eventually sells at the platform's higher multiple.

That spread is why bolt-ons dominate deal count. They're cheaper to buy individually, faster to close, lower-risk to integrate one at a time, and directly accretive to the platform's value from day one.

The 4-phase bolt-on sourcing process

Sourcing a bolt-on well is less a single step and more a repeating cycle of four phases: sourcing the target, executing diligence scoped to what it adds to the platform rather than its standalone worth, pricing it against that contribution, and integrating it on a roughly 100-day plan.

The mechanics are the same at every scale. What changes is how much of each phase gets covered by headcount versus by the tools and relationships a smaller team builds for itself.

Where PE firms, independent sponsors, and search funds actually find bolt-on targets

Bolt-on targets surface through four channels, and they aren't mutually exclusive.

Proprietary relationships. Deal team members, platform executives, and portfolio company management all have their own networks in the industry, and a warm introduction from someone the seller already trusts is still the highest-conversion path to a deal.

Broker and banker networks. Business brokers and boutique investment banks representing sellers in the platform's sector are a standing channel, especially for sellers who've already decided to run a process.

Industry mapping. Building a comprehensive list of every company in a fragmented sector and systematically working down it, by revenue size, geography, or service mix, is slower but surfaces targets a broker relationship alone would miss, especially in categories with thousands of small, undifferentiated operators like HVAC, plumbing, or landscaping.

Off-market, pre-listing outreach. This is the channel that's grown the most in the last few years, and it's the least covered in most sourcing guides. Instead of waiting for a target to be listed or represented by a broker, the buyer identifies owners who show signs of being ready to sell (commonly, age and no named successor) and reaches out directly, before the business is ever marketed. A business that never reaches a listing site also never reaches a competing bidder, and the buyer who reaches the owner first, with a credible offer, usually wins the conversation entirely.

Most sourcing guides treat that fourth channel as a footnote. In a market where roughly 70% of deal volume is bolt-ons and every serious buyer is running the same broker relationships and the same industry maps, it's often the difference between competing for a listed deal and not competing at all.

None of these four channels work well in isolation, and none of them work on a one-time basis. Industry mapping goes stale the moment you stop refreshing it. A broker relationship that hasn't been touched in six months won't get the first call on a new listing. Off-market outreach compounds: the owners who aren't ready this quarter are often the ones who are ready in a year, so a list you built and contacted once is worth far less than the same list worked on a cadence. The buyers who source the best bolt-ons treat sourcing as a standing weekly process, not a project that starts when the platform's growth plan calls for the next acquisition.

Why fragmented Main Street sectors are roll-up magnets right now

Home services, HVAC in particular, has become one of the most active roll-up categories in private equity, and the data backs it up. Private equity firms completed 32 add-on acquisitions targeting HVAC services providers through June 9, 2025, up 88% from 17 in the same period the year before, and just over half of all HVAC M&A activity in that window was PE-backed, according to S&P Global Market Intelligence. Capstone Partners separately counted 149 HVAC-services M&A deals across all of 2025, up nearly 13% year over year, even as broader industrial M&A activity fell.

Two of the largest home-services transactions in PE history closed within months of each other in early-to-mid 2026, and both illustrate the same thesis: fragmented, recession-resilient, non-tech service categories are where roll-up capital is concentrating.

If you're building a roll-up thesis, or trying to compete for the same targets the funds above are chasing, fragmented service categories with thousands of small, owner-operated businesses (HVAC, plumbing, electrical, landscaping, veterinary, pest control) are where deal volume is concentrating, and where the "off-market outreach" channel above tends to matter most: most of the sellers in these categories aren't working with a broker yet.

Independent sponsors and search funds: sourcing bolt-ons without a committed fund

Roll-up sourcing isn't just a mega-fund activity anymore. Independent sponsors, buyers who source and negotiate a deal before raising capital for that specific transaction, accounted for the largest share of any buyer type in closed deals on the Axial platform in 2025 (26.8 to 27%), ahead of traditional committed-capital PE funds (roughly 20 to 21%), according to Axial's 2025 Independent Sponsor Report. Industry trackers estimate more than 1,500 independent sponsors are active in the US today, roughly double the count from five years ago.

Search funds are a related, overlapping category. The 2024-25 search fund cohort's median purchase price for an acquired company was $16 million, the second-highest level ever recorded, and search funds tracked since inception have produced an aggregate pre-tax IRR of 33.9% and an average return on invested capital of 4.75x, according to Stanford Graduate School of Business. A meaningful share of that return comes from searchers who, after acquiring an initial platform, run their own roll-up by adding bolt-ons rather than growing organically alone.

Neither group has a dedicated origination team the size of a mega-fund's deal desk. That's exactly why sourcing channels, and the tools that extend a small team's reach, matter more here, not less.

The sourcing tool problem: enterprise platforms vs. what most deal teams can actually justify

The two platforms most associated with deal sourcing, Grata and SourceScrub, have both gone through a major shift. Datasite acquired Grata in June 2025 with a $500 million investment commitment, then acquired SourceScrub from Francisco Partners in August 2025, and is now merging the two into one product, according to Datasite's own announcement. Grata's median enterprise contract runs around $155,000 per year, sold only as a custom-quoted plan with a one-year minimum commitment and no public pricing, free tier, or self-serve option, per third-party pricing data compiled by CostBench.

That's a real, capable platform for a fund with a dedicated origination budget, and the consolidation under one owner likely means deeper data and fewer choices, not a lower price. It's simply not built, or priced, for an independent sponsor, a search fund, or a small PE shop sourcing its own bolt-ons, and there's no visible sign that's changing. For that segment, roughly 1,500-plus independent sponsors and a growing pool of search funds running their own roll-ups, the realistic choice isn't between Grata and a cheaper competitor. It's between a six-figure annual contract they can't justify and a self-serve tool priced for how they actually work.

Where Clef fits into bolt-on sourcing

Clef's inventory strength lines up directly with where roll-up activity is concentrated: 120,000+ business-for-sale listings from hundreds of brokers and marketplaces, weighted toward exactly the fragmented, non-tech Main Street sectors (HVAC, plumbing, home services, B2B, distribution) driving the roll-up numbers above, searchable in one place instead of across dozens of individual broker sites.

For the listed side of sourcing, Clef Explorer searches the full market, matches new listings to a saved buy box, and pulls revenue, earnings, and margin data onto every deal so a solo buyer or small team can screen fast. For the off-market channel, the one most sourcing guides barely mention, Clef Dealmaker takes that same buy box and finds businesses that aren't listed anywhere, run by owners who look ready for an exit, and surfaces the owner's name, phone, and email so you're the first call, not the fifth.

For a deal team running roll-up sourcing at real scale, Clef also offers a Fund tier: seats for a whole deal team, API access to the full 120,000+ dataset, bulk exports and custom data feeds, and admin controls, priced to the fund rather than sold as a fixed self-serve plan. It's newer than Explorer and Dealmaker and worth a direct conversation rather than a signup form; reach out through Clef's pricing page if that's the scale you're sourcing at.

None of this replaces the relationships and broker networks that still source a meaningful share of every roll-up. It's built to cover the other side: the listed deals you'd otherwise be checking a dozen broker sites to find, and the off-market ones that never reach a listing at all.

If you're earlier in the process and still defining what you're actually looking for, our guide to where to find businesses for sale covers the full landscape of sourcing channels beyond bolt-on-specific strategy, and our breakdown of common deal sourcing challenges covers the operational traps that slow a sourcing process down regardless of buyer type.