M&A's Dirty Secret: The Deal Closes, Then the Real Work Begins

Ten talks at Transform 2026 touched on mergers and acquisitions. Only two dealt with it directly. That gap tells you something. M&A is the highest-stakes event a company can go through. Yet most HR leaders treat it like a niche topic.

Most deals fail because of people problems. HR's silence on M&A is not an accident.

The speakers who did show up weren't holding back. They've lived through the chaos: as acquirers, as the acquired, and as the person fighting to get into rooms that didn't want them. They described a discipline still being built from hard lessons.

Culture Doesn't Survive by Accident

The main M&A session at Transform was called "Blending People, Processes, and Values Through Mergers and Acquisition." It was direct about where deals go wrong. The problem isn't the valuation or the synergy targets. The problem is assuming two organizations can merge and culture will fix itself.

"History is littered with deals that fail or succeed based on culture and whether or not cultural integration is going to happen."

— Speaker, "Blending People, Processes, and Values Through Mergers and Acquisition," Performance Reimagined Track

The problem is built into how deals work. Acquirers are designed to close deals. Investment bankers, corporate development teams, and lawyers get paid to get the signature. Integration work gets handed to HR months later. By then, the real decisions are already made.

HR headhunter Peter Phelan gave a dark comedic take on this at Transform's "Cocktails & Comedy" session:

"When your company gets acquired, chances are it's going to kill the culture. So why not just stop investing in the culture, like, way ahead of time? Save some cash."

— Peter Phelan, HR Headhunter, "Cocktails & Comedy," Innovation Stage

The joke works because it's true. Many companies accept that acquisition kills culture. Then they plan around that fact.

The Onboarding Failure Nobody Talks About

The clearest moment in the M&A session came from a simple observation. It's obvious. Its absence from standard practice is the problem:

"When you hire an employee, that person made a choice to come to you. That person gets onboarded into you. Yet when we acquire companies, we seem to forget — the employees didn't have a choice. And we forget to onboard them."

— Speaker, "Blending People, Processes, and Values Through Mergers and Acquisition," Performance Reimagined Track

Acquired employees get treated like items on a balance sheet. They woke up one day and found out their employer had been sold. Nobody onboards them. Nobody tells them what the new company stands for or where they fit. Nobody explains why this deal should matter to them. The result is attrition. Companies lose the exact talent that made the acquisition worth doing.

When You Don't Have Answers, Say So Anyway

Heather Dunn is Chief People Officer at Brex. She described managing an acquisition announcement before she had all the answers, with her workforce watching closely.

"My motto is always 'clear is kind.' We don't have all the clarity. But at least saying what we do and we don't know has been at least the crutch in the meantime."

— Heather Dunn, Chief People Officer at Brex, "Blending People, Processes, and Values Through Mergers and Acquisition," Performance Reimagined Track

Most executives do the opposite. They say nothing until they can say everything perfectly. That doesn't work. Silence reads as deception. Employees fill the gap with worst-case assumptions. Naming what you know, and what you don't, is honest and practical.

Another panelist acknowledged the other side of that plainly:

"You're gonna get it wrong. Like, there's gonna be unhappiness and there will be noise and you just have to kind of say, yeah, got it, thank you."

— Speaker, "Blending People, Processes, and Values Through Mergers and Acquisition," Performance Reimagined Track

The Table You Have to Fight to Sit At

The most urgent theme in the M&A session was access. HR leaders often get locked out of due diligence entirely. The results are predictable. Compensation gaps show up after the deal closes. Benefits liabilities go unexamined. Cultural problems go unspotted when a few conversations would have caught them.

"A deal is never gonna be done at this company where I'm not at the table — or one of my people at the table — at the start of the diligence."

— Speaker, "Blending People, Processes, and Values Through Mergers and Acquisition," Performance Reimagined Track

That's a hard-won rule. On the acquired side, the fight looks different:

"When you are being acquired by a large company, you need to pound that table because their instinct is not necessarily going to be, 'Let's include Heather in everything.' I have been that annoying HR person who is like, I need to be at that meeting."

— Speaker, "Blending People, Processes, and Values Through Mergers and Acquisition," Performance Reimagined Track

Earning the seat works better than just demanding it. Speak the deal team's language. One panelist explained how:

"The role you can play as an HR leader is to help articulate what is the people version of the ROI that this deal is going to provide. Framing and reframing the value of strategic people leadership through the lens of the value of this deal is always going to win you a seat at the table."

— Speaker, "Blending People, Processes, and Values Through Mergers and Acquisition," Performance Reimagined Track

The Basics Are Due Diligence Too

A second session was called "Everyone Wants Transformation. Nobody Wants to Fix the Basics." It looked at M&A from a different angle. What happens to HR when a company grows through acquisitions before its own systems are ready to handle them?

Jill Larson is Chief Legal Officer at Synopsys. She described exactly that situation:

"It's not sexy, but it's really, really important foundationally. Because you can't play at this level if you can't deliver at this level."

— Jill Larson, Chief Legal Officer at Synopsys, "Everyone Wants Transformation. Nobody Wants to Fix the Basics," Innovation Stage

The session's practical advice: treat data and systems readiness as an ongoing condition. Don't wait for a term sheet to start cleaning things up.

"Have your ducks in a row as much as you can in terms of, hey, if I had to go into diligence tomorrow, are there systems that we should probably clean up? It's the kind of boring, unsexy stuff, but how would you think about having 3 weeks to get behind a deal?"

— Speaker, "Blending People, Processes, and Values Through Mergers and Acquisition," Performance Reimagined Track

There's a risk on the acquirer's side too. Companies bring in familiar people and lose the institutional knowledge of the team they just bought.

"One of the biggest mistakes you can make is come in and then bring like all your friends in, all the people that have worked for you before. It's a huge mistake because you lose the context, especially in companies that are more long-tenured."

— Jill Larson, Chief Legal Officer at Synopsys, "Everyone Wants Transformation. Nobody Wants to Fix the Basics," Innovation Stage

Why Transform Only Had Two Sessions on This

Two M&A sessions at a major HR conference says something. Companies conduct M&A in boardrooms. The craft of merging two workforces stays poorly understood and rarely discussed. There is no standard playbook. The practitioners building one are doing it deal by deal.

Both sessions showed what the HR leaders who get this right have in common. They get into due diligence early. They communicate honestly when they don't have answers. They plan integration with discipline. They're willing to be the annoying person in the room. The ones who don't fight for those things end up writing post-mortems on deals that should have worked.