How to Build a Proprietary M&A Pipeline Before the Banker Calls

Define Your M&A Sourcing Strategy Before You Source Anything

The most common pipeline mistake happens before a single company is evaluated.

Teams start sourcing before they've defined where inorganic investment is needed.

Not every aspect of your business is a priority for M&A. Some capability gaps close faster through hiring, and some adjacencies are better addressed through partnerships. The first job of a proprietary pipeline is to identify the specific gaps in technology, capability, and channel access that the acquisition must solve. Without that definition, corp dev ends up evaluating companies that have no real connection to business priorities. The pipeline gets wide, attention gets fragmented, and nothing gets the depth it needs.

Start by working with leadership to determine which business units make inorganic investment a genuine priority. For each, map the specific capability gaps. 

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Ask:

□ What does this business unit need that it can’t build or hire for in a reasonable timeframe? 

□ What technology or channel access would meaningfully accelerate the strategy? 

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Get alignment at the board and leadership level on where capital and energy will be focused, and that definition becomes the filter for everything that follows. If a company doesn't connect to a defined gap, it doesn't belong in the pipeline, no matter how interesting it looks.

"M&A is not a strategy in itself. M&A is a tool of a corporate strategy." — Matt Arsenault, How to Formulate Your M&A Strategy

Building a pipeline without adjacency mapping and screening criteria upfront pulls teams toward attractive but off-strategy companies. This step takes longer than most teams want to spend, but it’s essential. After all, a pipeline built without a strategic definition is just a list of companies.

Make Business Unit Leaders Your Primary Corp Dev Pipeline Source

Once inorganic priorities are defined, the fastest path to a high-quality pipeline isn’t through corp dev research or banker relationships. It’s through your business unit leaders.

Market leaders are already operating in the relevant space, so they know which companies are driving industry change. They know which partners are filling capability gaps, which founders they trust, and which have performed under pressure. That intelligence is real-time and relationship-based in a way no database or sourcing tool can replicate. Which is why the most effective origination models are built from the business up, and not from corp dev outward. 

Note: The Bottoms Up Deal Origination Model is worth reading alongside this section to understand how it operates in practice.

So what’s the operating model shift? Corp dev's job is to evaluate and prioritize what business unit leaders surface, not to source independently. "We're much more end-to-end if you think about the deal life cycle," Benjamin Orthlieb observed in Bottoms Up Deal Origination Model. So, sourcing, strategy, and integration are owned together, not handed off across functions. 

When a BU leader brings a target, they're validating the thesis from inside the market. They've seen the tech in action, understand the cultural fit, and can articulate why the gap exists (and how this company fills it).

There's a second reason this model works: ownership. A business unit leader who brings a target into the pipeline owns that deal through close and into integration. They become the person with conviction, relationships, and accountability, and deals sourced by corp dev alone rarely have that. Without a true champion, deals stall at the first sign of internal resistance.

Building this model requires corp dev to invest time internally — not just externally. Show up consistently in leadership forums. Connect M&A directly to each business unit's goals. Make the pipeline visible: what you're tracking, why those companies, how they connect to where the business is going. When people across the organization understand what M&A is solving for, they start contributing to it. BU leaders stop being a constituency to manage and become genuine co-owners of the sourcing process.

Most corp dev teams skip this internal work. They focus almost entirely outward — researching targets, taking external calls, building banker relationships — while the business unit leaders who should be their primary sourcing channel barely know what corp dev is working on. The internal relationship work is what makes the external work possible. Without it, you're sourcing in a vacuum.

How to Source M&A Deals Without Relying on Bankers

Business unit leaders should generate the majority of the pipeline. Three additional channels fill the gaps, but they don’t replace the foundation. They supplement it.

Banker network. Maintain active relationships with sell-side advisors who operate in your sector. The goal isn't to be on their distribution list; it's to be known well enough that they think of you when something relevant is coming to market. That means sharing your strategy with them regularly: what you're focused on, which capability gaps you're trying to fill, and which kinds of companies you want to hear about. When a process launches, you should already know the company. If a CIM arrives and the target is unfamiliar, your pipeline has a gap. Fewer than 20% of pipeline targets should be companies you've never encountered before.

PE firm relationships. Build a two-way dialogue with financial sponsors active in your space. Share your strategy and understand their portfolios. This relationship isn't transactional, because depending on the situation, you may buy from them, sell to them, or co-invest. The firms that do this well treat PE relationships as genuine partnerships, not just a source of deal flow. Regular outreach, honest conversations about strategic direction, and genuine interest in what they're building create the kind of relationship where they call you before a process goes wide. Jeremy Segal covers this dynamic directly in How to Source Deals and Build Your Pipeline: reactive teams waiting on inbounds are already behind the buyers who built those relationships early.

Proprietary sourcing. Use available market data to identify targets your business unit leaders haven't surfaced yet. Depending on your sector, this could include procurement data, conference intelligence, sector mapping, or systematic landscape analysis. Rishabh Mishra's approach in Sourcing Companies That Are Not For Sale is instructive here:  

Proactive outreach to targets before a formal sale process begins is what separates buyers who shape deals from buyers who react to them. This channel supplements what the others produce. It’s not the foundation.

Build Proprietary Deal Flow With Depth, Not Just Breadth

For any capability gap you've defined as an inorganic priority, you need five to ten legitimate candidates.

Here is why it matters beyond the obvious. 

When you have a single candidate for a critical gap, you lose the ability to make clear-eyed decisions. You can’t pressure-test fit against alternatives, and you can’t walk if the terms don't work. You enter the deal with nowhere to go, and that shows up in how you negotiate, handle diligence findings, and respond to seller push-back.

One-option deals don't just lower your probability of success; they change the psychology of the entire process. You’re reluctant to walk away because it means starting over from scratch. That's when teams make decisions they later regret. They had no frame of reference for how good or bad it actually was.

Pipeline depth also requires a long time horizon. Some targets don't meet your scale or technology thresholds today, but that’s not your cue to ignore them. It’s your cue to start tracking them. But a watch list is only useful if you know what to track and what triggers a move to active pursuit. 

Here’s the operating model:

The relationships that produce the best proprietary deals are built over years, not activated when a target becomes urgent — a pattern that runs through Inside Atlassian's M&A Strategy: Sourcing, Negotiation & Integration. By the time urgency hits, the trust should already be there.

The Failure Modes That Kill Proprietary Pipelines

Most proprietary pipeline failures trace back to one of four places.

No defined inorganic strategy. Corp dev ends up evaluating everything that looks interesting. The pipeline bloats, bandwidth gets stretched across too many companies, and nothing gets the depth of attention it needs. You end up knowing a lot of companies at a surface level and none of them well enough to be the preferred buyer. The fix is a strategic definition before sourcing. Get leadership alignment on priorities, and use that as the filter for everything entering the pipeline.

Business unit leaders not embedded in sourcing. Corp dev sources independently, brings targets to BU leaders for input, and then wonders why there's no champion when the deal gets hard. The tell is when every internal conversation about a target starts with educating stakeholders on why it matters, because they weren't part of building the thesis. The fix is treating BU leaders as the primary sourcing channel from the start, which requires doing the internal relationship work that most corp dev teams deprioritize.

Pipeline too shallow. One or two candidates per capability gap creates pressure to force deals that aren't ready. When a deal feels like the only option, discipline breaks down on price, terms, and fit signals that should disqualify it. The fix is building depth before urgency: five to ten candidates per priority area, tracked over time, so you always have somewhere to walk to.

Deal fever. When a target checks every box and momentum builds, it’s easy to rationalize away problems. Diligence findings get explained instead of evaluated, cultural concerns get minimized, and price discipline softens. That’s why it’s critical to define your walk-away criteria before you're in the process. Require sign-off from both Corp Dev and the sponsoring market leader before moving past key milestones. The teams that walk away from bad deals aren't inherently more disciplined. They just built the discipline into the process before the emotion kicked in.

The Long Game

A proprietary pipeline is not a project with a start and end date. It’s an operating cadence that runs continuously, gets reviewed regularly, and deepens over time.

The buyers who consistently win proprietary deals started cultivating relationships years before those targets became actionable. They were present, consistent, and genuinely useful to the founders they were tracking. When the time came, the founder called them first because the relationship and trust were already in place.

That's what a real proprietary pipeline produces: A position as the preferred buyer before the process starts.