Why 70% of M&A Deals Fail And the Quiet Role Marketing Plays in That

I’ve been in this industry long enough to know what the day after a deal closes actually looks like.

The advisors have done their job. The lawyers have done their job. The bankers have done their job. Everyone who got paid to get the transaction over the line has moved on to the next one. And somewhere in a Slack channel, two marketing leaders who have never met are staring at each other trying to figure out whose website wins, whose product names survive, and what the hell to tell the customer base on Monday.

This is the part of M&A nobody plans for until it’s too late.

Harvard Business School puts the M&A failure rate at over 70%. The conversation around that number tends to focus on due diligence, cultural fit, and financial modeling — and those matter. But in my world, I watch a quieter version of failure play out over and over again: the deal technically closes, but the combined company never shows up to market as a combined company. Customers get confused. Sales teams compete with each other. Pipeline slows. The promised synergies stay on the slide deck.

That’s not a strategy problem. That’s a marketing and sales enablement problem. And it’s one of the most underestimated risks in any transaction.

Most M&A failures aren’t financial — they’re a marketing problem hiding in plain sight. The deal closes, but the combined company never shows up to market as one.

What advisors do brilliantly — and what they don’t do

I want to be clear about something, because I work alongside M&A advisors all the time and I think most of them are excellent at what they do.

A good advisor will get you a fair valuation, run a clean process, manage the negotiation, and close the deal. That is genuinely hard work and it requires a specific kind of expertise that I don’t have and don’t pretend to have.

But here’s what advisors typically don’t do, and shouldn’t be expected to:

• Decide which brand survives, which gets sunset, and how to communicate either choice to the market
• Build the messaging architecture that explains the new entity to customers, prospects, employees, and analysts
• Integrate two websites, two CRMs, two content libraries, two sales decks, two pricing pages, two sets of case studies, and two demand gen engines into one operational system
• Train both sales teams on the new positioning so they stop accidentally pitching against each other
• Keep the existing pipeline moving while all of the above is happening

That’s not a gap in advisory work. That’s just outside the scope of advisory work. The problem is that most acquirers don’t realize how big that scope is until they’re standing inside it.

The 9-month problem

When companies handle marketing and sales integration internally — without a partner who’s done it before — it typically takes about nine months to feel finished. Sometimes longer.

Nine months of customer confusion. Nine months of two sales teams operating with different scripts. Nine months of legacy domains still ranking, legacy email sequences still going out, legacy case studies still circulating with the old logo. Nine months of the analyst community asking what the strategy is, and getting different answers depending on who they ask.

In my experience, that timeline can be compressed to roughly three months when integration is run as its own workstream by a team that has done it before. Not because we work magic, but because we’ve already built the playbook. We know what order things have to happen in. We know which decisions cause downstream problems if you defer them. We know what gets political and how to depoliticize it.

We average about four of these engagements a year — roughly one a quarter — and we currently have three active. That’s not a brag. That’s a tell. The volume of consolidation activity in HR technology, workforce technology, and adjacent SaaS categories is high right now, and most of the companies in motion are quietly trying to figure out the marketing piece on their own.

What integration requires

When we walk into a post-LOI or post-close engagement, the work tends to fall into four buckets. None of them are optional, and most acquirers underestimate at least two of them.

1. The strategic story. Why did this deal happen? What does it mean for customers? What does it mean for prospects? What does it mean for the category? This is the narrative the CEO will repeat for the next two years, and it has to be built deliberately — not improvised in the announcement press release.

2. The brand decision. One brand, two brands, a new brand, a temporary endorsed structure that transitions over 18 months — there is no universally right answer, but there is a wrong answer for every specific deal, and choosing wrong creates years of cleanup. This decision has to be made early and made with conviction.

3. The operational integration. Websites, content libraries, sales collateral, email programs, paid media accounts, marketing automation platforms, CRM data, SEO equity, analyst briefings, customer communications, partner communications, employee comms. All of it has to be inventoried, sequenced, and migrated without dropping pipeline. This is where most internal teams get buried.

4. Sales enablement and cross-sell activation. The whole point of most deals is that 1+1 should equal more than 2. That doesn’t happen by accident. It happens when both sales teams are trained on the combined offering, given clear messaging on cross-sell motions, and equipped with collateral that reflects the new reality. If you wait six months to do this, you’ve already lost the upside the deal was supposed to create.

What we typically see

The clients who get this right share a few things in common.

They bring marketing into the conversation earlier than feels comfortable — often under NDA, well before the deal is public. They treat integration as its own project with its own owner, not as something the existing marketing team will absorb on top of their day jobs. They make brand decisions fast and stick with them. They sequence customer communication carefully. And they protect the pipeline aggressively while the integration is happening, because pipeline lost during integration is pipeline that doesn’t come back.

The clients who get this wrong tend to do the opposite of all of the above. They wait until the deal closes to start thinking about marketing. They assume the existing team will figure it out. They let brand decisions drag because the founders disagree. They let customer comms get reactive instead of proactive. And they watch pipeline slow for two or three quarters and call it a market problem.

Waiting until the deal closes to think about marketing integration is how you lose the upside the deal was supposed to create. Here’s what the companies who get this right actually do differently.

The quiet competitive advantage

We’ve worked with companies on both sides of these transactions — acquirers, targets, and the new entities that emerge after. We’ve worked under NDA on deals that were announced six months later, and we never spilled the beans, because that’s the entire point of being trusted in this work. We’ve also, more than once, ended up introducing two of our own clients who turned out to be a natural fit for each other and went on to build something together.

The reason I’m writing this is straightforward. Most of our M&A integration work has come through quiet word of mouth — advisors who’ve seen us operate, founders who’ve been through it before and know what they don’t want to repeat, and existing clients who hit their second or third roll-up and want backup.

But there are a lot of companies out there right now, especially in HR tech and workforce tech, who are either deep in a deal or eyeing one, and don’t know that this is something we do. So this is me telling you it’s something we do.

If you’re inside a transaction and the marketing piece is starting to feel bigger than expected, or if you’re considering one and want to think about integration before it becomes urgent, that’s a conversation worth having early. Even if we don’t end up working together, you’ll leave the conversation with a clearer picture of what you’re walking into.