The first hundred days after buying a company: what the people who run it know that diligence did not

The first hundred days after buying a company go better when the plan rests on how the company actually runs, not on the data room. Diligence heard management. The people who do the work know where the company leaks, who everything depends on and where the quick wins are, and nobody asked them. Hear all of them in the first weeks, before close where you can, and build the 100-day plan on what they know. Transcript, our product, has a private conversation with every person and turns what they know into a world model the deal team and the operating partner can plan from. Nobody's conversation is read by management.

The plan is built from the seller's account

A 100-day plan is written before anyone from the fund has spent a day inside the company. Its inputs are the information memorandum, the management presentations, the data room and a few weeks of operational due diligence. Bain's 2026 Global Private Equity Report describes traditional diligence as largely defensive, an exercise in confirming what is in the memorandum (Bain & Company, 2026). The value creation plan then inherits those inputs, and the operating partner arrives with a plan built from the seller's account of the seller's company.

That account is not a lie. It is the view from the top. A CEO of a 200-person company knows the strategy, the customers and the numbers. She rarely knows that month-end depends on one controller's spreadsheet, that the warehouse team skips the scanning step because it double-counts, or that two sales offices quote the same product on different terms. Nobody hid these things. They live with the people who do the work, as tribal knowledge, and diligence never reached them.

The consequence is well documented. Study after study puts the failure rate of mergers and acquisitions between 70 and 90 percent (Christensen and others, Harvard Business Review, 2011). The usual explanation is integration. Ours is narrower: the plan was built on an incomplete picture of how work actually gets done, and the first hundred days went on discovering the difference.

What the people who run Acme know

Take Acme, a 300-person components manufacturer, bought by a fund that plans to grow it into two new markets. The value creation plan has three levers: pricing, procurement and a new ERP. Each is real. Here is what the people who run Acme know, and the plan does not.

Where it leaks. The planners know that a third of rush orders are rush because quoting waits on one engineer's approval. The credit controller knows which customers pay late every quarter and why. The shift leads know which machine's downtime never reaches the maintenance log because the workaround is faster than the ticket.

Who everything depends on. The month-end close, the pricing file, the two biggest customer relationships and the only working export of the old ERP each sit with one person. Each is a single point of failure, and two of them have been looking for work since the sale was announced. Key person risk of this kind concentrates knowledge and relationships in one individual rather than the organisation, and buyers who find it late find it reduces value (Compass Business Acquisitions, 2026).

Where the quick wins are. The operational due diligence checklist asks whether there are quick wins and how engaged key employees are with the deal (Dealroom, 2026). In practice the answers come from a handful of management interviews. The people on the floor have a list: a supplier contract that renews automatically at a price nobody has questioned, a reporting pack three people build by hand every Monday, a returns process the sales team routes around because the official one takes a week.

None of this is in the data room. All of it changes the plan. The ERP lever is riskier, because the one person who understands the old system may leave. The procurement lever is bigger. And there is a fourth lever, the quoting bottleneck, that nobody in diligence saw.

Hear everyone in the first weeks

The way to reach this knowledge is to hear every person, privately, in their own words. Not a survey, which asks the questions you already know. Not a town hall, where nobody describes the workaround in front of their manager. A private conversation with each person about their work and what gets in the way.

That is what Transcript does. It talks with every person in the company, compares the accounts, asks again where they differ, and lets each person approve what was learned from their words before it enters the model. Nobody, including management and including us, reads a conversation. The company sees the world model: every process as it really runs, the problems people raise and how many raise each one, and the people and handoffs everything depends on.

Timing matters. Before close you can usually reach management and sometimes the layer below. Transcript starts with the people you can reach and fills the model in as access grows, the top layers before close and the whole company after. BCG's 2026 work on 100-day programmes names sponsor and management alignment from day one, and accountability inside the 100-day cadence, as the first conditions for a reset that holds (BCG, 2026). A shared model of how the company really works is what the two sides align on.

The 100-day plan then sits on the company as it is. Key people are named in week one, not discovered in week ten when one resigns. Quick wins come from the people who will deliver them. The levers are re-sized against what the work actually costs today, in the company's own hours and rates. And the model keeps moving after day 100, because people keep talking about their work, so the second-year plan is written on a company that has already been described.

Our view

This is our view, and it runs against how most funds work. Diligence is treated as the moment of understanding and the first hundred days as the moment of action. For companies of 50 to 500 people the order is wrong: most of what matters never touched a system and lives with the people who run the place. The understanding has to come from all of them, and it has to come first.

We also think the private channel is the mechanism, not a courtesy. People describe the workaround when they know their manager will not read the transcript. Open the conversations to management and you get the manual back.

Once the world model exists, it is the ground for everything else the fund wants to do with the company, including the AI programme most value creation plans now carry. We have written separately about how a fund makes its portfolio companies AI-native. This guide is about the hundred days before that.

Where this does not fit

A company in distress needs a restructuring adviser first. A bolt-on of fifteen people can be heard in a week without tooling. A management team that will not let its people speak privately has closed the door, and the fund should ask why.

Questions people ask next

When should a private equity 100-day plan actually start, at signing or at close?

At signing, with the people you are allowed to reach. Management and the layer below can usually be heard between signing and close and the plan drafted from them. Fill it in with the rest of the company after close and expect the plan to change.

How is a 100-day plan different from a value creation plan?

The value creation plan is the investment thesis in operating terms: the levers, their size and the timeline over the hold. The 100-day plan is its first stretch: what gets done, who owns it and what is measured by day 100. Both are built from diligence, which is why both should be revised once the company has been heard.

What are the most common operational red flags investors uncover?

Single points of failure in people and systems, processes that run on workarounds rather than the documented version, and reporting built by hand on top of systems nobody trusts. All three are invisible from the data room and obvious on the floor.

How do you identify and mitigate key person risk in a deal?

Ask every person what they alone know how to do and what stops when they are away, then see where the answers point to the same person. That gives a named list early. Mitigation is documentation, a trained backup and a redesigned role, in that order. Insurance pays out; it does not recreate the knowledge.

Who should own the 100-day plan, the operating partner or the portfolio company CEO?

The CEO owns it and the operating partner holds her to it. Both need the same picture of how the company really works, so the plan is not a negotiation between the fund's model and the CEO's memory.

References

1. Bain & Company, Welcome to a New Era in Private Equity (Global Private Equity Report 2026), 22 February 2026, https://www.bain.com/insights/welcome-to-a-new-era-global-private-equity-report-2026/
2. Boston Consulting Group, The 100-Day Cost Reset in Private Equity, 9 June 2026, https://www.bcg.com/publications/2026/the-100-day-cost-reset-in-private-equity
3. Clayton M. Christensen, Richard Alton, Curtis Rising and Andrew Waldeck, The Big Idea: The New M&A Playbook, Harvard Business Review, March 2011, https://hbr.org/2011/03/the-big-idea-the-new-ma-playbook
4. Dealroom, The Ultimate Guide to Operational Due Diligence (ODD), updated 15 July 2026, https://dealroom.net/blog/how-to-conduct-operational-due-diligence
5. Compass Business Acquisitions, What Is Key Person Risk and How Do You Fix It?, 26 August 2026, https://compassbusinessacquisitions.com/post/key-person-risk