Bottom line: The first 100 days after a private equity acquisition are the highest-leverage window of the entire hold period, and marketing is the piece most 100-day plans leave out. Nearly every fund builds a 100-day plan, but it is overwhelmingly about finance, cash, cost, data, and operations, with the demand engine parked as “hire an agency later.” In a market where revenue growth drives most of the return, that omission wastes the one window where marketing changes are cheapest to make and compound the longest. Bringing the growth engine into the 100-day plan, seeded by the diligence findings, is how a fund starts capturing revenue growth on Day 1 instead of month twelve.
Key Facts at a Glance
- Roughly 90% of private equity firms formulate a 100-day plan when they acquire a business, making it a near-universal practice (Grant Thornton and PitchBook study, via A Simple Model).
- The first 100 days are widely regarded as the highest-leverage window of the hold period: access improves overnight, the organization is paying attention, and small decisions compound across the entire investment (Umbrex, 2026; TriVista, 2026).
- Most 100-day plans run in phases, commonly Foundation (Days 1 to 30), Assessment (31 to 60), and Execution (61 to 100), and the strongest ones prioritize ruthlessly: three initiatives executed well beat ten executed poorly (Planr, 2025).
- The plan should begin before close, seeded by the investment thesis and diligence findings, so execution starts on Day 1 rather than after a slow ramp (A Simple Model, 2025; AlixPartners).
- Leading indicators of value-creation-plan delivery include top-of-funnel lead generation and customer metrics, not just lagging financials, yet these demand-side indicators are often missing from the plan (AlixPartners).
- Revenue growth drove about 71% of the value created in 2024 buyout exits, so the demand engine the plan builds is the engine the return now depends on (Bain & Company, 2026).
- A well-built growth workstream has to survive without the operating partner in the room by Day 100; if the sponsor still runs the weekly pipeline review in month six, the plan failed (Vx Group, 2026).
This guide draws on Peter Geisheker’s 20-plus years of B2B marketing experience as founder and CEO of The Geisheker Group, Inc., a fractional CMO agency serving B2B, B2B SaaS, PE/VC-backed, and law firm clients. Peter has personally managed more than $50 million in annual advertising spend and has stood up demand engines under exactly the time pressure a 100-day plan imposes; documented outcomes include 6X inbound lead growth and a 77% reduction in paid acquisition cost while revenue grew. The perspective here is an operator’s: what marketing should actually do in the first 100 days to start moving revenue, informed by 2026 private-equity value-creation research from Bain, McKinsey, AlixPartners, and others.
Table of Contents
- What Is the First-100-Days Plan, and Why Does It Matter So Much?
- Why Do Most 100-Day Plans Leave Marketing Out?
- Why Is That a Costly Omission in 2026?
- What Should Marketing Actually Do in the First 100 Days?
- How Does Marketing Due Diligence Feed the 100-Day Plan?
- How Do You Avoid the Common Mistakes?
- How Do You Know the First 100 Days Worked?
- Frequently Asked Questions
What Is the First-100-Days Plan, and Why Does It Matter So Much?
The 100-day plan is the sequence of actions a fund takes in the first 100 days after acquiring a company to set the operating and growth agenda for the hold period. It is nearly universal; around 90% of PE firms build one (Grant Thornton and PitchBook). And it matters more than any comparable stretch of the investment because of a simple dynamic: right after close, access improves overnight, the organization is paying attention and expecting change, and the small decisions made in this window compound across years of ownership (Umbrex, 2026).
That is why practitioners are blunt about the stakes. The first 100 days determine whether a value-creation plan gains traction or stalls, and firms that move decisively early are far better positioned to deliver the thesis, while those who delay spend the rest of the hold trying to recover time they cannot get back (TriVista, 2026). It is the honeymoon and the starting gun at once, and what gets built into the plan is what gets executed.
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Why Do Most 100-Day Plans Leave Marketing Out?
Look at what a standard 100-day plan actually contains and a pattern emerges. It establishes a trusted financial baseline and a reconciled EBITDA definition. It installs a 13-week cash forecast and tightens spend controls. It triages data and reporting. It assesses the management team and stabilizes operations and customer experience. These are the right things to do, and they are almost entirely finance, cash, cost, data, and operations (Umbrex, 2026; Planr, 2025).
Marketing rarely appears. When growth shows up in the plan at all, it is usually framed as sales coverage or pricing, with demand generation deferred to a vague later phase or outsourced to whatever agency the company already uses. The reasons are understandable: operating partners are most fluent in the levers PE has always pulled, the early days are genuinely crowded with stabilization work, and marketing feels less urgent than cash. But understandable is not the same as correct, and the omission has a real cost.
Why Is That a Costly Omission in 2026?
It is costly because of where the return now comes from. With cheap debt and multiple expansion gone, revenue growth drove roughly 71% of the value created in 2024 exits (Bain & Company, 2026). The demand engine is what produces that revenue growth, so leaving it out of the highest-leverage window is leaving the primary return driver idle during the exact period when changes are cheapest to make and have the most time to compound.
There is a measurement version of the same mistake. Seasoned operators point out that the leading indicators of value-creation-plan delivery are behaviors and early-performance signals like top-of-funnel lead generation, not just the lagging financials measured a quarter later (AlixPartners). A plan that tracks only cash and EBITDA is watching the scoreboard while ignoring the things that move it. And because a demand engine takes time to build, every month it is deferred is a month of growth pushed further from the exit. Starting the marketing workstream on Day 1 is not about doing everything at once; it is about not wasting the window.
What Should Marketing Actually Do in the First 100 Days?
Marketing fits the same phased structure the rest of the 100-day plan uses. The goal is not a full rebuild in 100 days; it is to baseline the demand engine, land two or three quick wins, and install a system that keeps running.
Days 1 to 30: baseline the demand engine. Get access to the CRM, ad accounts, and analytics in the first two weeks, not the first two months. Map where pipeline actually comes from and how concentrated it is, because a company sourcing most of its pipeline from one channel or one person carries a risk a financial review never surfaces. Establish CAC by channel and fix attribution so there is a single trusted view of what marketing produces. If a marketing due diligence assessment was run before close, this phase is largely already done, which is the point of running one.
Days 31 to 60: quick wins and ownership. Prioritize ruthlessly; three initiatives executed well beat ten executed poorly (Planr, 2025). Kill or fix the worst-returning channels and reallocate that budget, ship the highest-leverage conversion fixes, sharpen the value proposition on the best-fit accounts, and name a clear owner for growth. Quick, visible wins here build the credibility that funds the bigger moves later.
Days 61 to 100: install the system. Build the repeatable demand engine and begin the owned-demand work that compounds over the hold rather than renting pipeline forever. Stand up a weekly pipeline review and reporting in the value-creation-plan’s language, so marketing’s output is visible to the sponsor in the same terms as every other workstream. Most important, make it run without you: if the growth system depends on the operating partner or the fractional CMO personally attending every review, it has not been installed, it has been performed (Vx Group, 2026).
How Does Marketing Due Diligence Feed the 100-Day Plan?
The first 100 days go dramatically better when the diligence was done right. A marketing due diligence assessment, run before close, is effectively the first draft of the 100-day marketing plan: it has already mapped pipeline sourcing, established CAC by channel, and identified where the demand engine is weak. That means the operating team walks in on Day 1 knowing exactly what to fix first, instead of spending the first month discovering it.
This is the same principle McKinsey applies to operational value creation generally, that the operating team should be involved during diligence rather than parachuting in after close. The diligence-to-100-day handoff is where that principle becomes concrete for the growth engine, and it is one reason funds increasingly treat marketing as part of the value-creation team rather than a vendor called in later. It sits inside the broader fractional CMO model for private equity value creation.
How Do You Avoid the Common Mistakes?
Three mistakes derail the marketing workstream in the first 100 days, and all three are avoidable.
The first is trying to do everything. Ambitious plans pack in too many initiatives, and when everything is a priority, nothing is; organizations have limited capacity for change (Planr, 2025). Pick the two or three moves that matter and execute them well. The second is confusing activity with a system: hiring an agency to run campaigns is not the same as building a demand engine with an owner and a cadence, and campaigns without strategy produce motion, not growth. The third is operating-partner dependence. If the plan only works while the sponsor or the fractional CMO is personally in the room, it fails the moment their attention moves to the next deal. The whole point of the 100-day window is to install something that outlives it.
How Do You Know the First 100 Days Worked?
Judge it on leading indicators, not just the financials that lag a quarter behind. By Day 100 you want a single trusted view of where pipeline comes from and what each channel costs, at least two quick wins already showing up in conversion or CAC, a named owner running a weekly pipeline review, owned-demand work underway, and marketing reporting into the value-creation plan in the same language as every other workstream. The final test is the durability test: the growth system should keep running without the operating partner in the room. Hit those, and marketing has stopped being the workstream that starts in year two and become part of the engine from Day 1.
Frequently Asked Questions
What is a 100-day plan in private equity?
A 100-day plan is the sequence of actions a fund takes in the first 100 days after acquiring a company to set the operating and growth agenda for the hold period. Around 90% of PE firms build one. It typically runs in phases (Foundation, Assessment, Execution) and should be seeded by the investment thesis and diligence findings so execution starts on Day 1.
Why should marketing be part of the 100-day plan?
Because revenue growth now drives most of the return (about 71% of value created in 2024 exits), and the demand engine produces that growth. The first 100 days are the highest-leverage window of the hold period, so leaving marketing out idles the primary return driver during the exact period when changes are cheapest and compound the longest.
What should marketing do in the first 100 days?
Baseline the demand engine in Days 1 to 30 (access, pipeline sourcing, CAC by channel, attribution); land quick wins and name a growth owner in Days 31 to 60; and install a repeatable system with a weekly pipeline cadence and value-creation-plan reporting in Days 61 to 100, built to run without the operating partner.
How does marketing due diligence connect to the 100-day plan?
A marketing due diligence assessment run before close is the first draft of the 100-day marketing plan. It maps pipeline sourcing, establishes CAC by channel, and flags where the demand engine is weak, so the operating team starts Day 1 knowing what to fix rather than spending the first month discovering it.
What are the most common mistakes in the first 100 days?
Trying to do too much (three initiatives done well beat ten done poorly), confusing hiring an agency with building a demand engine that has an owner and a cadence, and building a system that only works while the sponsor or fractional CMO is personally present. Avoid all three by prioritizing ruthlessly and installing something that outlives the window.
Does marketing need a full-time hire to do this in 100 days?
No. Most portfolio companies need senior strategy and execution speed, not a full-time CMO salary. A fractional CMO can baseline the engine, deliver the quick wins, and install the system inside the 100-day window, then stay engaged at the level the company actually needs through the hold.
Building the Growth Engine From Day One
The first 100 days reward speed and punish delay. Doing marketing right in that window, baselining the demand engine, landing quick wins, and installing a system that runs on its own, takes an operator who has done it under time pressure before, not a plan that defers the growth work to a later phase that never quite arrives.
That is fractional CMO work, and it starts at or before close. If your fund has that capability in house, you may not need outside help. If your situation is the common one, a strong deal and operations team without someone who has stood up a demand engine on a 100-day clock, a short conversation will tell us whether we can help make marketing part of the value-creation plan from Day 1.
About Peter Geisheker
Peter Geisheker is a fractional CMO and founder and CEO of The Geisheker Group, Inc., serving B2B, B2B SaaS, and PE/VC-backed companies. He has managed more than $50 million in annual advertising spend and specializes in standing up capital-efficient, measurable demand-generation systems quickly, with documented results including 6X inbound lead growth and a 77% reduction in paid acquisition cost while revenue grew. With 20-plus years of experience translating marketing into revenue and enterprise value, Peter provides senior marketing leadership to portfolio companies and their sponsors without the cost of a full-time executive hire.
Ready to make marketing part of your value-creation plan from Day 1? Schedule a free consultation with Peter Geisheker. Connect with Peter on LinkedIn.
References and Sources
- A Simple Model, “Post Acquisition Work: The First 100 Days”: a Grant Thornton and PitchBook study finding that almost 90% of PE firms formulate 100-day plans; the plan should start before close, seeded by the investment thesis and diligence. https://www.asimplemodel.com/insights/post-acquisition-work-the-first-100-days
- Umbrex, “The First 100 Days” (Value Creation Plan Primer): the first 100 days as the highest-leverage window in PE ownership; the five objectives and the single trusted baseline. https://umbrex.com/resources/the-value-creation-plan-primer/the-first-100-days/
- TriVista, “Private Equity Value Creation: The First 100 Days” (2026): the first 100 days determine whether a value creation plan gains traction or stalls; act early or spend the hold recovering lost time. https://trivista.com/articles/private-equity-value-creation-the-first-100-days/
- Planr, “The 100-Day Value Creation Plan for New Acquisitions” (2025): the Foundation, Assessment, Execution phase structure; ruthless prioritization, three initiatives done well over ten done poorly. https://planr.com/the-100-day-value-creation-plan-for-new-acquisitions/
- AlixPartners, “Speed to Value: The First 100 Days”: leading indicators such as top-of-funnel lead generation versus lagging financial outputs; quick wins and no-regret moves in the value-creation plan. https://www.alixpartners.com/insights/102iwgp/speed-to-valuethe-first-100-days/
- Vx Group, “100-Day Plan for Private Equity: A Guide” (2026): a revenue-focused 100-day sequence; naming growth owners; the plan must survive without the operating partner running the weekly pipeline review. https://www.thevxgroup.com/insights/100-day-plan-private-equity/
- Bain & Company, “Global Private Equity Report 2026”: revenue growth drove about 71% of value created in 2024 exits; returns now depend on operational, top-line value creation. https://www.bain.com/insights/topics/global-private-equity-report/
- McKinsey & Company, “Bridging Private Equity’s Value Creation Gap” (2024): involve the operating team during the diligence phase; run operational value-creation diligence for the top line. https://www.mckinsey.com/industries/private-capital/our-insights/bridging-private-equitys-value-creation-gap
- Maestro, “Crafting a Winning 100-Day Plan in Private Equity”: the 100-day countdown begins at close; building trust and alignment while capturing early wins. https://www.go-maestro.com/blog/maximizing-value-creation-crafting-a-winning-100-day-plan/
- Zone & Co, “For CFOs, Private Equity Value Creation Starts in the First 100 Days” (2025): translate the investment thesis into first-quarter priorities; sponsors expect speed and control. https://www.zoneandco.com/articles/for-cfos-private-equity-value-creation-starts-in-the-first-100-days
- RKON, “Private Equity 100 Day Plan” (2026): the 100-day plan as a roadmap to identify key value drivers and align to strategy. https://www.rkon.com/private-equity/technology-advisory/100-day-plans/
- McKinsey & Company, “Global Private Markets Report 2026: Private Equity”: the shift toward operational value creation and revenue quality across the hold period. https://www.mckinsey.com/industries/private-capital/our-insights/global-private-markets-report/private-equity
