A few weeks ago I wrote about the lessons from 12 acquisitions. This is the companion piece. The actual 30-60-90 day playbook I run after every close. I don't use consultants for this. I don't use a 200-page integration manual. I use a whiteboard, a two-page document, and a brutally consistent weekly rhythm.
This is consistent with what McKinsey's PMI research and BCG's M&A and PMI practice have documented across hundreds of deals. The acquirers who capture value early move decisively on a small number of integration priorities. Chasing "everything at once" is the single biggest correlated predictor of deal failure. I've been on both sides of that curve — the one where you try to boil the ocean in week two, and the one where you pick three things and refuse to blink.
The goal of PMI is not to integrate everything. The goal is to not destroy value while you figure out what to actually integrate. Most acquirers get that backwards. They try to move fast on everything and end up moving slow on nothing. The playbook below is built to prevent exactly that failure mode.
Days 1-30: Stabilize and listen. Shut your mouth.
Day one is not a strategy day. It is a signal day. Every person in the acquired company is watching you to figure out whether their life is about to get worse. Nothing else you say or do in the first week matters as much as what you communicate — verbally and non-verbally — about what kind of owner you're going to be.
The day-one communication stack
- Seller announces first. Founder stands up and says they chose us. They made the decision. This matters enormously for cultural buy-in. Nobody trusts the acquirer on day one. They trust the founder who just sold to them.
- I speak second, for no more than four minutes. Who I am. Why I'm excited. What will not change in the next 90 days. What I don't yet know. Four minutes. No more.
- No slides. No strategy. No synergy talk. Anyone who talks about synergies on day one is announcing they're about to cut jobs. The team hears it. They update their resumes that night. I've watched it happen in real time.
- Open Q&A for 30 minutes. I answer every question directly. If I don't know, I say so. Do what you say, say what you do — that rule starts on day one, and breaking it once costs you the whole quarter.
The rest of the first 30 days is about listening. I do one-on-ones with the top 15 people. Same five questions every time. What do you love about this company. What would you change. What's broken that leadership doesn't see. Who's the most important person on your team. What's one thing you need from me in the next 90 days.
By day 30 I have 75 data points from 15 conversations. I also have a pretty clear mental map of who the real operators are, who the political animals are, and who quietly carries the business. That map is worth more than the data room.
The first 30 days are not about integration. They're about learning enough to not make an expensive mistake in the next 60.
Days 31-60: Lock the financials. Pick three bets. Write "not now" on the whiteboard.
By day 31 the combined monthly close should already be running — I wrote about this in the acquisition playbook piece. Non-negotiable. If your books are not consolidated by end of month one, you are flying blind into month two, and there is no good way to recover from that.
Once the financials are stable, the job of month two is to pick exactly three integration bets. Not twelve. Not eight. Three. These are the only things your integration team works on for the next 60 days. Every other good idea goes into a bucket we'll come back to later.
How I pick the three bets
- One revenue bet. Something that moves the top line in the next two quarters. Usually cross-sell or pricing alignment. Not a new product. Not a new market. Something you can ship in 90 days.
- One cost bet. Something that captures real synergy without destroying the team. Usually consolidating a duplicated tool or overlapping function. Not headcount. Headcount is what everyone runs at first, and it's what kills the deal.
- One culture bet. Something symbolic that makes the combined entity feel like one company. Usually a shared ritual, comms cadence, or leadership forum. Sounds soft. Isn't.
Everything else that comes up — and everything will come up — goes into a "not now" bucket. I physically write it on a whiteboard under a line. When anyone asks why we're not doing it, I point at the whiteboard. "Not now" is not "never." It's "not in the next 60 days, because we are protecting our focus." Saying no to good ideas is the entire discipline of month two.
Days 61-90: Make the hard call on leadership. The one you've been putting off.
By day 61 you know. You know who is a real operator and who was holding the place together with their personality. You know which of the seller's hand-picked lieutenants are going to make it and which were promoted beyond their skill during the run-up to the sale. You know whether the head of sales is a closer or a talker.
Day 61 to day 90 is when you make the leadership calls you already know need to be made. Not sooner — you didn't have the data. Not later — the company will start to rot around ambiguity. You make the calls, you make them publicly, you do right by the people leaving, and you give the people staying a visible seat at the combined leadership table.
I have never once made these calls in the first 30 days and been right. I have also never once waited until day 120 and been glad I waited. Day 61-90 is the window. Miss it and you spend the rest of the year fighting a fire you lit yourself.
The weekly rhythm that ties it all together
None of this works without a ruthless weekly rhythm. Here is mine, unchanged across every PMI I've run:
- Monday 9am, 45 minutes: combined leadership team — three slides. Trailing week, this week, blockers. No strategy debates. No "can we talk about…" That's what one-on-ones are for.
- Wednesday 2pm, 30 minutes: integration bet review — just the three bets. Owner reports. Green/yellow/red. Help needed.
- Friday 5pm, written: one-page unfiltered note from the acquired GM to me. No formatting rules. What's working. What's broken. What they need.
- Monthly first Tuesday, 90 minutes: combined board-style review with the seller in the room. This is where trust either gets built or destroyed. Take it seriously.
What success looks like at day 90
At day 90, the bar is not "we have integrated everything." The bar is "we have not destroyed value, we know what we have, and we have a clear point of view on what the next 90 days look like." If you can credibly say that in the boardroom on day 91, you are in the top quartile of PMI execution. Most acquirers cannot. Most acquirers are still arguing about logos and email domains.
The 70% failure rate for M&A is not a diligence problem. It's a post-close execution problem. The companies that succeed do the unglamorous work of listening, stabilizing, and ruthlessly protecting their focus for 90 days before they try to do anything ambitious. That's the whole secret. There is no trick. Just the discipline to resist the pressure to "show synergies" until you have earned the right to act on them.
So here's my challenge. If you're about to close a deal, print this page. Put it on your wall. On day 31, day 61, and day 90, read it again and ask yourself if you actually executed it — or if you got pulled into the noise and called it progress. Be honest. The gap between intent and execution is where most deals die, and the only thing that closes it is the willingness to do boring things relentlessly for three months.