A Sell-Side Preparation Checklist Lower Middle Market Founders Actually Need

Most founders start preparing to sell their business about six months too late. The books get a scrub, a banker gets a call, a teaser goes out, and then the diligence requests arrive and the gap between how the company runs and how it reads on paper becomes a renegotiation. The price does not fall at the LOI. It falls between the LOI and the wire.

A disciplined 12-to-18-month runway closes that gap. The work is not glamorous. It is unglamorous reconciliation of the ledger, the legal file, the real estate, the customer base, and the operating record so that a buyer with a trained eye finds what the seller said they would find. What follows is the line-item version, written from the seat of a long-term holder that reads these packages for a living. The reader should assume that 70% to 90% of M&A deals fail to create shareholder value, and that inadequate preparation is the root cause named most often.

Start the Clock 12 to 18 Months Before an LOI

A middle-market sell-side process is not short. From engagement letter to closing wire, a typical middle-market sell-side process runs about 9 to 12 months, with readiness at 8 to 12 weeks, outreach and initial offers at 4 to 6 weeks, management meetings at 2 to 3 weeks, LOI negotiation at 2 to 4 weeks, and confirmatory diligence at 8 to 12 weeks. Sector drag is real. Among US Main Street closings in 2025, the median time to close was 170 days, with manufacturing deals running to 223.

Those numbers describe the formal process. The private preparation window sits in front of them. Twelve to eighteen months is enough time to run a trailing-twelve-month view of normalized earnings through two reporting cycles, close a weak quarter, replace a departing controller, cure a lease defect, and settle an open piece of litigation before it has to be disclosed. It is not enough time to grow out of a customer concentration problem or to re-paper fifty master service agreements. Those have their own clocks.

Financial Preparation Is a Quality-of-Earnings Problem

Buyers do not pay a multiple on reported EBITDA. They pay a multiple on normalized, defensible, buyer-adjusted EBITDA, and the arithmetic between those two numbers is where the deal gets made or lost. An Axial study of 75 unsuccessful 2025 lower-middle-market transactions put non-QoE diligence findings at 25.3% of failures and QoE EBITDA discrepancies at 21.3%, a combined 46.6% of broken deals traceable to the numbers.

The preparation list is specific:

• Three full years plus trailing twelve months of monthly P&L, balance sheet, and cash flow, tied to the general ledger and to tax returns.
• A written EBITDA bridge from reported to adjusted, with every add-back supported by invoice, contract, or payroll detail. Owner compensation normalized to the market cost of the person who will actually do the job. Related-party rent restated to market.
• Revenue by customer, by product, by month, for 36 months, with concentration cuts.
• Deferred revenue, revenue recognition policy, and a cash-to-accrual reconciliation where the books are kept on cash.
• A proof-of-cash tie between bank deposits and reported revenue for the trailing twelve.
• Working capital by month for 24 months, which the buyer will use to set the peg.

A sell-side quality of earnings report, commissioned by the seller before going to market, is now the baseline rather than the exception on deals above roughly $2M of EBITDA. The point is less that the seller discovers surprises and more that the seller gets to answer them before a buyer finds them.

Set the Working Capital Peg Before the Buyer Does

The single most expensive line in many LOIs is one most sellers skim: the net working capital target. The buyer wants to inherit enough working capital to run the business without a cash call on day one, so a target is set and the price trues up to it at closing. Roughly 70% of middle-market deals use a trailing twelve-month average to set the peg because it captures seasonality and produces a defensible normalized level.

Seasonality works both ways. A business that sells in Q4 and collects in Q1 looks capital-light on June 30 and capital-heavy on December 31. If the buyer picks the point they prefer, the seller is paying for the swing. Preparation here is monthly working capital for 24 months, a clear policy on what is included (cash is usually excluded, debt-like items are negotiated separately), and a view of the collar. Typical collars make no adjustment unless the gap exceeds roughly $100,000 or 1 to 2% of the peg, which is the threshold the seller is negotiating against whether they realize it or not.

Legal and Corporate Housekeeping Before the Lawyers Arrive

Buy-side counsel will ask for everything. Prepared sellers have it in a tidy folder; unprepared sellers hand their lawyers a six-figure cleanup project on the clock. The target list:

• Charter, bylaws, operating agreement, every amendment, every consent, and a clean cap table reconciled to the stock ledger. Phantom equity, SARs, and warrants listed with vesting and payout mechanics.
• Minute book current. Board and shareholder consents for every material action, including past dividends and distributions.
• Material contracts indexed with change-of-control, assignment, and exclusivity provisions flagged. These are where price gets held up when a top-ten customer has consent rights.
• Employment agreements, non-competes, non-solicits, and PIIA assignments for every employee who has written code, invented a process, or carried a customer relationship.
• IP schedule: registered marks, patents, domains, source code ownership chain, open-source usage log.
• Litigation schedule with status, reserve, and counsel contact for anything open, threatened, or closed in the last five years.
• Permits, licenses, and regulatory filings by jurisdiction, with renewal dates.
• Insurance schedule with limits, deductibles, claims history, and a conversation already started with a broker about representations and warranties coverage. In the ABA's 2025 Private Target Deal Points Study, 63% of agreements referenced representations and warranties insurance, up from 55% in 2023.

Thoughtful buy-sell agreements and clean corporate records are not a legal nicety. They are the difference between a two-week sign-to-close and a two-month one.

Real Estate Decisions Belong Upstream of the LOI

For asset-heavy sellers, the real estate decision shapes the whole package. A long-term holder may want to buy the operating company and the building together. A financial sponsor may want to split them, lease back, and move on. The seller's optionality depends on preparation done early.

The file: current appraisals, environmental Phase I and, if warranted, Phase II, ALTA survey, title commitment, zoning verification, roof and HVAC condition reports, property tax history, and a market rent study. The point is to know what the real estate is worth on its own, what a reasonable triple-net rent looks like, and what the after-tax math says. Prior work on sale-leaseback net proceeds and the trade-off between all-cash exits and rolled equity covers the structural choices. The preparation is making those choices on the seller's timeline, not under LOI pressure.

Operational Documentation the Buyer Will Actually Read

A long-term holder underwrites to the business as it will run after the founder steps back, which means underwriting the organization, the systems, and the customer relationships. The documentation that moves the needle:

• An org chart with tenure, compensation, and succession notes for every role above the first-line supervisor level. Any role currently filled by the founder gets a replacement plan and a cost.
• Standard operating procedures for the five to ten processes that generate most of the revenue. Not a 400-page binder; a working set that a new hire could use on Monday.
• A systems inventory: ERP, CRM, accounting, scheduling, payroll, with versions, hosting, admin owners, and renewal dates.
• Customer concentration disclosure in both directions. Top-ten customers by revenue and gross margin, with contract terms, tenure, and the name of the human relationship inside the account.
• Supplier concentration, lead times, and single-source exposures.
• Backlog, pipeline, and win-rate data presented consistently with how management runs the business, not reshaped for the deck.
• KPI history: on-time delivery, warranty claims, utilization, retention, whatever the industry version is.

This is also where institutional memory starts to matter. A buyer paying for a durable business is paying for knowledge that lives in the company rather than in the founder's head.

Build the Data Room as a Narrative, Not a Dump

The data room is a sales document. A well-indexed room with 300 to 500 files, staged by diligence phase, is read as competence. A 5,000-file dump with inconsistent naming is read as risk. Stage 1 holds what any screened party can see after signing an NDA: CIM, summary financials, redacted customer list, org chart. Stage 2 opens after LOI with full contracts, employee detail, and underlying financial support. Stage 3 is the confirmatory set for the winning bidder.

The index itself should mirror the way a buyer runs diligence: corporate, financial, tax, commercial, customers, suppliers, employees, IP, real estate, legal, operations. Buyer questions get logged in the room with owners and due dates. The room, not an email thread, is the system of record. Operators considering a direct conversation can see target investment criteria before preparing a package, which saves a quarter of the work when fit is obvious one way or the other.

Choose the Buyer Set Before the Teaser Goes Out

Preparation ends with a decision about who the package is for. A strategic buyer underwrites synergy and may accept a messier set of books in exchange for revenue overlap. A financial sponsor underwrites return and will cut hard on anything that threatens the model. A long-term holder underwrites durability and the operator the founder leaves behind. The documents, the real estate structure, and the rollover ask differ by audience.

Sellers who are clear about which conversation they want should narrow the list rather than widen it. A targeted process with ten right-fit buyers often clears at a better number, with less information leakage, than a broad auction with eighty names. The long-term holder's view is that the right fit matters more than the top of the range, because the earn-out, the rolled equity, and the next five years of working together are priced in the fit, not the headline.

What Changes When the Buyer Owns for Decades, Not Quarters

The checklist does not change by buyer type. The weight on each item does. A flip-oriented sponsor skims the operational documentation and leans on reps, insurance, and the exit model. A long-term holder reads the SOPs, meets the second line of management, and asks what breaks if a key customer leaves in year three. The seller who has prepared for the harder read negotiates from a stronger position in either room.

Preparation is not performance. It is the removal of surprises. A seller who spends a year closing the gap between the business they run and the business they describe does not need a cleverly worded CIM. They need a quiet data room, a clean QoE bridge, a current minute book, a defensible working capital peg, and a short list of buyers whose intent they understand. The price follows.