Hiring an M&A advisor is one of the few decisions in a business sale that gets made before any buyer appears, and it shapes nearly everything that follows: which buyers are contacted, how the company is presented, what the process costs, and how long it takes. Most owners in the lower middle market sell a company once, while the advisors they interview have pitched hundreds of times, so the meeting is naturally lopsided. A structured set of interview questions, applied consistently to every candidate, is one way owners level that imbalance. The questions below are organized as a scorecard covering six areas: track record, fees, process, buyer access, conflicts, and references. They are educational prompts for evaluation, not a checklist with correct answers, and nothing here is legal, tax, or investment advice.
Why a structured interview changes the comparison
Advisor pitches tend to emphasize different strengths. One firm leads with a large claimed buyer database, another with industry specialization, a third with a headline valuation estimate. When each meeting follows the candidate's preferred script, the owner ends up comparing incomparable things. Asking every candidate the same questions, in the same order, and recording the answers turns three or four persuasive presentations into a side-by-side dataset. It also surfaces a useful signal on its own: how a candidate responds to direct questions about fees, failed deals, and conflicts often says as much as the answers themselves.
A note on vocabulary: in the lower middle market the same role is performed by business brokers, M&A advisors, and boutique investment banks, with meaningful differences in process, licensure, and cost. The questions below apply across all three categories, though the expected answers differ by firm type and deal size.
Track record and deal-size fit
Experience in M&A is only partially transferable. A firm that closes $200 million transactions runs a different process, talks to different buyers, and prices its services differently than a firm that closes $8 million transactions. Relevance, recency, and completion rate matter more than logo count. Questions in this area include:
- How many sell-side engagements has the firm closed in the past three years, and what was the size range?
- How many engagements in that period were signed but never closed, and what were the most common reasons?
- Which closed transactions were in this industry or an adjacent one, and what role did the firm actually play in each?
- Who at the firm sourced those deals, and who executed them day to day?
- What percentage of closed deals finished within the valuation range presented at the pitch stage?
The completion-rate question deserves emphasis because it is rarely volunteered. Industry surveys and practitioner commentary consistently note that a meaningful share of sell-side engagements never reach closing, so a firm that claims every engagement closes is describing either a very selective intake process or a very generous memory. The last question addresses a known pattern in the industry sometimes called buying the listing, where an inflated valuation estimate wins the engagement and reality arrives months later in the form of weak indications of interest.
Fee structure and what the engagement letter contains
Sell-side fees in the middle market typically combine a retainer or work fee with a success fee paid at closing. According to the Axial and Firmex M&A Fee Guide covering 2024 and 2025, roughly 44 percent of surveyed firms use a Lehman-style formula in which the success fee percentage declines as deal size increases, about 20 percent use an accelerator formula that rewards outcomes above a threshold, and about a quarter charge a flat percentage. Success fee percentages generally run higher on smaller transactions and lower on larger ones. The same survey notes that most firms now require some form of engagement or work fee rather than working purely on contingency. Questions in this area include:
- What is the complete fee structure: retainer, success fee formula, minimum fee, and any milestone payments?
- Is the retainer credited against the success fee at closing?
- How is the success fee calculated on deferred consideration such as earnouts, seller notes, and rollover equity?
- What does the tail provision say: how long after termination does the firm earn a fee if the company sells to a buyer it introduced?
- What expenses are billed separately, and is there a cap?
- Under what conditions can either party terminate, and what is owed at termination?
The earnout and tail questions tend to matter most in practice. If a fee is charged on the full face value of an earnout that may never pay out, the seller can owe cash at closing on money not yet received. Tail periods commonly run from several months to two years, and the difference between a tail that covers any buyer contacted versus one limited to buyers who signed confidentiality agreements or received materials is significant.
Process, timeline, and who does the work
Two firms quoting the same fee can deliver very different processes. One runs a broad auction with prepared financial diligence materials; another lists the company on a marketplace and waits. Lower-middle-market sale processes commonly take somewhere in the range of six to twelve months from engagement to closing, though outcomes vary widely with preparation, industry, and market conditions. Questions in this area include:
- What are the phases of the process, and what happens in each: preparation, marketing, indications of interest, management meetings, letter of intent, diligence, closing?
- What materials does the firm prepare, and who writes them: teaser, confidential information presentation, financial model, data room?
- Does the firm prepare or coordinate a quality-of-earnings analysis before buyers arrive, or is that left to buyer diligence?
- Who is on the deal team, how many active engagements does each person carry, and who attends buyer meetings?
- How does the firm run competitive tension: broad auction, targeted outreach, or negotiated process, and why for this company?
The staffing question is a classic one in the industry. At many firms the senior partner who wins the engagement hands execution to junior staff, which is not inherently bad but is worth knowing before signing rather than after.
Buyer network breadth and how outreach actually works
Nearly every advisor claims a proprietary buyer network. The useful follow-up is how that network was built, how current it is, and how it maps to this specific company. Lower-middle-market buyers include strategic acquirers, private equity funds and their platform companies, independent sponsors, family offices, and search funds, each with different criteria and closing behavior. Questions in this area include:
- How many buyers would realistically receive the teaser for a company of this size and industry, and how was that list built?
- What mix of strategic, private equity, independent sponsor, and individual buyers has the firm closed with recently?
- How does the firm verify that a buyer has committed capital or financing before granting data room access?
- How is confidentiality protected during outreach: blind teasers, staged disclosure, exclusion lists for competitors?
- Can the firm describe a recent process where the winning buyer was not on the initial list, and how that buyer was found?
The exclusion-list question matters for owners worried about competitors, key employees, or customers learning about the sale. A disciplined process controls who learns what, and when.
Conflicts of interest worth asking about directly
Conflicts in sell-side work are usually structural rather than scandalous, which is why they often go unmentioned. An advisor who also represents buyers, earns referral fees, or has a standing relationship with a private equity firm is not necessarily compromised, but the arrangement affects incentives. Questions in this area include:
- Does the firm ever represent buyers, and has it represented any likely buyer for this company in the past few years?
- Does the firm receive referral fees, financing fees, or any compensation from anyone other than the client in this engagement?
- Are there buyers the firm would exclude from outreach because of existing relationships?
- Does the fee structure create pressure to close quickly at a lower price rather than push for a higher one?
- Who at the firm, if anyone, has a financial interest in any prospective buyer?
The speed-versus-price tension is inherent to success fees: an extra month of negotiation might raise the price 5 percent, but the advisor's share of that increment can be small relative to the value of closing sooner and moving to the next deal. There is no structure that fully removes the tension, which is why the question is about disclosure rather than a right answer.
Regulatory standing and background verification
Regulation in this field is layered. Since March 29, 2023, a federal statutory exemption under Section 15(b)(13) of the Securities Exchange Act has allowed qualifying M&A brokers to facilitate the sale of privately held companies without registering as broker-dealers, generally where the target company had under $25 million in EBITDA or under $250 million in gross revenues in the prior fiscal year, subject to conditions on buyer control and involvement in management. Law firm analyses of the statute, including a client alert from Goodwin, note that the exemption is federal only and that state-level registration requirements still vary, so an unregistered advisor is not automatically noncompliant and a registered one is not automatically better. For advisors who are registered representatives of a broker-dealer, FINRA's BrokerCheck tool is free and shows registration status, ten years of employment history, and disclosure events such as customer disputes and disciplinary actions. Questions in this area include:
- Is the firm or any team member registered with a broker-dealer, relying on the federal M&A broker exemption, or operating under a state exemption?
- Has any team member been subject to regulatory discipline, customer complaints, or litigation related to prior engagements?
- Does the firm carry errors and omissions insurance?
- If the deal could involve a stock sale with rollover equity or buyer securities as consideration, how does the firm handle the securities-law aspects?
References, and what preparation reveals
Reference calls are most informative when they go beyond the happy list. Former clients whose deals did not close, and attorneys or CPAs who sat across from the firm in past transactions, tend to give a fuller picture than three hand-picked success stories. Common reference prompts include what the firm was like when the process hit trouble, whether the initial valuation guidance held up, how responsive the deal team was after the letter of intent, and whether the final fee matched the original engagement letter. A related line of questioning covers preparation itself: what the firm does before going to market, since companies that enter a process with reconciled financials, a defensible adjusted EBITDA, and an organized data room tend to face fewer retrades in diligence. The market now includes technology-enabled platforms, such as Bankerly, that build the quality-of-earnings analysis, projection model, and marketing materials before outreach begins, and the existence of that option gives owners a useful benchmark question for any candidate: exactly what preparation work is included in the fee, and what gets discovered only after buyers start looking. However the sale is run, guidance from the Small Business Administration points to the same fundamentals: establishing value through recognized valuation approaches, documenting the transaction thoroughly, and attorney review of the sale agreement.
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Frequently asked questions
- What does a sell-side M&A advisor actually do?
- A sell-side advisor manages the sale process for the business owner: preparing marketing materials and financial analyses, building and contacting a buyer list, running competitive bidding, coordinating diligence, and supporting negotiation through closing. Scope varies widely by firm, which is why the interview stage usually covers exactly which deliverables and phases are included in the fee.
- Are M&A advisors required to be registered or licensed?
- It depends on the transaction and the state. Since March 29, 2023, Section 15(b)(13) of the Securities Exchange Act has exempted qualifying M&A brokers from federal broker-dealer registration, generally for sales of private companies with under $25 million in EBITDA or under $250 million in gross revenues, subject to conditions. State registration rules still vary, and some advisors remain registered representatives of broker-dealers, whose backgrounds can be checked for free on FINRA BrokerCheck.
- How are M&A advisors typically paid?
- Most middle-market engagements combine a retainer or work fee with a success fee at closing. Per the Axial and Firmex fee guide covering 2024 and 2025, about 44 percent of surveyed firms use a Lehman-style scale where the percentage declines as deal size grows, while others use flat percentages or accelerator formulas that reward results above a threshold. Percentages are generally higher on smaller deals and lower on larger ones.
- What is a tail period in an M&A engagement letter?
- A tail period is the window after an engagement ends during which the advisor still earns its success fee if the company sells to a buyer the advisor introduced or contacted. Tails commonly run from several months to two years. Key variables include the length, and whether the tail covers every buyer contacted or only buyers who signed NDAs or received offering materials.
- What is the difference between a business broker and an investment banker?
- The terms describe overlapping roles at different deal sizes. Business brokers generally handle smaller sales, often under a few million dollars, frequently using listing-based marketing. Investment banks and M&A advisory firms typically run managed auction processes for larger companies, with prepared diligence materials and negotiated deal structures. Fee levels, licensure, and process depth differ accordingly across the spectrum.
Considering a sale in the next few years? See what a prepared process looks like.
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