Boutique Investment Banks: How They Differ From Bulge Bracket and When to Hire One

Boutique investment banks are smaller, specialized advisory firms that compete with bulge-bracket Wall Street giants on a different axis: deeper sector expertise, senior-banker attention on every deal, and a sell-side process built for lower-middle-market and middle-market founders rather than Fortune 500 corporate clients. This guide explains how boutique investment banks actually work, how they get paid, when they beat the bulge bracket, when they do not, and how a business owner should choose one.

If you are a founder of a $5M to $250M revenue company thinking about selling, refinancing, or recapitalizing, you are squarely in boutique territory. The question is which kind of boutique fits your deal, and how to evaluate them before you sign an engagement letter.

What Are Boutique Investment Banks

A boutique investment bank is a smaller, focused M&A advisory firm that typically employs between 10 and 1,500 professionals and concentrates on a narrower set of services than the bulge bracket. Most boutiques focus exclusively on advisory work: sell-side M&A, buy-side M&A, capital raises, fairness opinions, and restructuring. They do not have trading desks, retail brokerage networks, or lending balance sheets.

The practical definition is closer to how the industry actually uses the word. Boutique investment banks are firms where the senior banker who pitches the deal is the senior banker who runs the deal. There is no handoff to an associate the day after you sign. That alignment is what most founders are buying when they hire a boutique.

FINRA registration is the regulatory floor. Any firm earning transaction-based compensation on securities transactions must be registered as a broker-dealer with FINRA and the SEC, with limited exemptions (M&A brokers under the 2023 SEC no-action relief, for example). When you vet a boutique investment bank, the first check is the FINRA BrokerCheck record for the firm and the individual bankers. If a boutique is not registered and is taking success fees on a sale of stock, that is a red flag.

The Investment Banking Trade Council (ITC) tracks roughly 400 boutique investment banks operating in the United States across the elite, sector, and lower-middle-market tiers. MergerMarket league tables for 2025 show that boutiques collectively advised on more middle-market deals (transactions under $500M) than the bulge bracket for the eighth consecutive year.

Boutique Investment Banks vs Bulge Bracket: The Real Differences

The bulge bracket is a small group of global universal banks: Goldman Sachs, Morgan Stanley, JPMorgan, Bank of America, Citigroup, Barclays, Deutsche Bank, UBS, and Credit Suisse (now part of UBS). They run full-service investment banking divisions inside firms that also do sales and trading, asset management, wealth management, commercial lending, and prime brokerage. Their M&A advisory business is one product line among many. Boutique investment banks are advisory-only.

That structural difference drives every practical difference a founder will feel during a sale process. Here is what actually changes when you hire a boutique investment bank instead of a bulge-bracket firm.

Senior Banker Attention

At a bulge-bracket firm, the managing director who pitches your deal is running 12 to 20 active mandates. The day-to-day is run by a vice president and two associates. At a boutique investment bank, the managing director is on every call. That is the single biggest reason founders hire boutiques.

Deal Size Fit

Bulge-bracket firms have minimum deal sizes that exclude most lower-middle-market companies. Goldman Sachs rarely takes sell-side mandates under $250M. Morgan Stanley publishes a stated minimum of $100M but in practice prioritizes deals above $300M. Boutique investment banks operate across the full range: elite boutiques compete with the bulge bracket on $1B+ deals, while sector and lower-middle-market boutiques run sell-sides from $5M to $500M.

Sector Expertise and Conflict-Free Advice

The best boutique investment banks know one or two sectors at a depth that is hard for a bulge-bracket generalist to match: Houlihan Lokey on financial services and restructuring, William Blair on growth-stage technology and healthcare, Lincoln International on industrials, Raymond James on energy. And because boutiques have no lending book, no trading book, and no underwriting calendar, they are conflict-free by design. The same firm advising you on the sale is not also lending to your buyer or holding their stock in a proprietary account.

Fee Structure

Bulge-bracket firms typically charge between 0.5% and 1.5% of transaction value on large deals with substantial retainers. Boutique investment banks charge higher percentages (1% to 5% on lower-middle-market deals) but lower retainers in success-fee-heavy structures. We cover the math below.

The Three Boutique Categories: Elite, Sector, and Middle-Market

Industry practitioners typically split boutique investment banks into three categories. The lines blur at the edges, but the categories are useful for figuring out which firms to call.

Elite boutiques are advisory-only firms that compete head-to-head with the bulge bracket on the largest M&A transactions in the world. Centerview, Evercore, Lazard, Moelis, PJT, and Perella Weinberg are the canonical names. They advise on $1B+ deals, often $10B+ deals, and they routinely appear on the same league tables as Goldman and Morgan Stanley. If you are running a $5B carve-out for a Fortune 100 company, you are calling an elite boutique alongside or instead of a bulge-bracket firm.

Sector-specialist boutiques are mid-sized firms with 200 to 1,500 professionals that go deep on specific industries. Houlihan Lokey, William Blair, Raymond James, Lincoln International, Stifel Financial, Stephens Inc, and Robert W. Baird sit in this tier. They typically advise on deals between $50M and $1B and frequently win mandates against both elite boutiques and bulge-bracket firms when sector expertise is the deciding factor.

Lower-middle-market boutiques are smaller firms (often 10 to 100 professionals) that focus on transactions between $5M and $250M in enterprise value. This is where most American business owners actually live. Generational Equity, Capstone Partners, Cornerstone Business Services, Calder Capital, Sequoia Mergers & Acquisitions, Greene Holcomb Fisher, and CT Acquisitions operate in this category. The right lower-middle-market boutique for you depends on your sector, your deal size, and your geography.

Elite Boutiques: Centerview, Evercore, Lazard, Moelis, PJT, Perella Weinberg

The elite boutique investment banks are a small group of advisory-only firms that have built credibility on the largest, most complex M&A transactions. They are not the right choice for a $25M sell-side mandate. They are the right choice when the deal is large, the dynamics are complex, and the founder or board wants senior advice from someone with no conflicting product agenda.

Centerview Partners

Founded in 2006 by Blair Effron and Robert Pruzan, Centerview Partners is privately held and consistently ranks in the top five global M&A advisors by fees per deal. The firm employs roughly 500 professionals and is known for the most complex special-situations mandates: contested takeovers, board-level fairness opinions, and cross-border deals. Centerview advised on the Pfizer-Allergan attempted merger, the Time Warner-AT&T deal, and the Activision Blizzard sale to Microsoft.

Evercore

Evercore was founded in 1995 by Roger Altman and went public in 2006. With more than 2,000 employees globally, it is the largest of the publicly traded elite boutiques and consistently ranks in the top 10 of the global M&A league tables. The firm also operates an investment management division, but its advisory practice is run as an independent unit.

Lazard

Lazard is the oldest firm on the list, founded in 1848 in New Orleans by three French brothers. The firm went public in 2005 and now operates as Lazard Ltd. with offices in 43 cities across 27 countries. Lazard’s M&A practice is particularly strong in Europe and on sovereign and restructuring mandates.

Moelis & Company

Moelis was founded in 2007 by Ken Moelis after he left UBS, where he had built the firm’s investment banking franchise. Moelis went public in 2014 and now employs roughly 1,000 professionals across 21 offices. The firm built its reputation on restructuring (it advised on the Lehman Brothers bankruptcy) and has expanded into a broad M&A practice.

PJT Partners

PJT Partners is a 2015 spin-out from Blackstone, where founder Paul J. Taubman had previously led the financial advisory business. The firm went public the same year it spun out and operates an M&A advisory practice, a restructuring practice, and Park Hill Group (private fund placements and secondaries). PJT employs roughly 800 professionals with a deliberate strategy of staying senior-heavy.

Perella Weinberg Partners

Perella Weinberg was founded in 2006 by Joseph Perella, Peter Weinberg, and Terry Meguid. The firm went public in 2021 via a SPAC merger and employs roughly 700 professionals. Perella Weinberg is known for industrial and energy sector expertise and has advised on a number of large carve-outs and cross-border combinations.

Sector-Specialist Boutiques: Houlihan Lokey, William Blair, Raymond James

Sector-specialist boutique investment banks occupy the middle tier of the boutique universe. They are bigger than the lower-middle-market firms (typically 500 to 1,500 professionals), they cover more sectors than the elite boutiques in their depth specializations, and they are the firms most often hired for $50M to $1B sell-side mandates where industry expertise drives outcomes.

Houlihan Lokey

Houlihan Lokey is the largest sector-specialist boutique and currently ranks #1 in the United States for M&A deal count, per MergerMarket 2025 league tables. The firm employs more than 2,500 professionals across corporate finance, financial restructuring, financial and valuation advisory, and capital markets. Houlihan Lokey is particularly dominant in restructuring (more Chapter 11 cases than any other firm) and in middle-market M&A across financial services, consumer, industrials, and technology.

William Blair

William Blair is a Chicago-based firm founded in 1935. The investment banking division employs roughly 600 professionals and focuses on growth-stage companies in healthcare, technology, and consumer. It is the go-to advisor for venture-backed and private-equity-backed companies in the $100M to $1B enterprise value range. The firm is privately owned and employee-controlled.

Raymond James

Raymond James Financial is a publicly traded firm with a substantial wealth management business and a focused investment banking practice of roughly 500 professionals. It concentrates on energy, financial services, healthcare, real estate, and technology, and runs one of the larger energy investment banking practices outside Houston.

Lincoln International

Lincoln International is a global mid-market firm with roughly 900 professionals across 20 offices in 15 countries. Lincoln is active in industrials, business services, and consumer, with one of the strongest cross-border mid-market practices outside the bulge bracket. The firm advises on roughly 350 transactions per year, mostly in the $50M to $500M range.

Stifel Financial, Stephens Inc, and Robert W. Baird

Stifel Financial is a publicly traded firm headquartered in St. Louis; its investment banking arm (including the legacy KBW franchise, acquired in 2013) is particularly strong in financial services, healthcare, and technology. Stephens Inc, founded in 1933 and headquartered in Little Rock, Arkansas, is one of the larger private investment banks in the United States, particularly active in financial services, consumer, and middle-market industrials. Robert W. Baird is an employee-owned firm headquartered in Milwaukee whose M&A group regularly advises private-equity-backed companies in industrials, consumer, healthcare, and business services on sell-sides in the $100M to $750M range.

Lower-Middle-Market Boutiques: Where CT Acquisitions Operates

Most American business owners do not need an elite boutique or a sector-specialist boutique. They need a lower-middle-market boutique investment bank that specializes in transactions between $5M and $250M in enterprise value and that has actually closed deals in their sector. This is the largest, most fragmented, and most uneven tier of the boutique universe.

The good lower-middle-market boutique investment banks deliver the same structural advantages as their larger peers: senior banker attention, conflict-free advice, deep relationships with strategic and financial buyers, and a process built around the founder’s outcome. The mediocre ones operate more like glorified business brokers with a fancier engagement letter. The differences show up in the buyer outreach, the process discipline, and the negotiation results.

Generational Equity and Capstone Partners

Generational Equity is a Dallas-based firm running a high-volume lower-middle-market practice that has closed thousands of transactions in the $5M to $75M range. Capstone Partners (part of the Headwaters MB family) runs sector-specialized practices in industrials, business services, technology, healthcare, and consumer on transactions from $25M to $500M.

Cornerstone, Calder, Sequoia, and Greene Holcomb Fisher

Cornerstone Business Services is a Wisconsin-based firm focused on closely held Midwest businesses in the $5M to $100M range. Calder Capital is a Grand Rapids-based firm specialized in industrial, manufacturing, and distribution transactions ($5M to $50M). Sequoia Mergers & Acquisitions is a Pacific Northwest boutique handling founder-owned services, distribution, and light manufacturing deals ($5M to $50M). Greene Holcomb Fisher is the Minneapolis-based M&A arm of D.A. Davidson, focused on industrials, business services, consumer, and healthcare deals ($25M to $300M).

CT Acquisitions

CT Acquisitions is a lower-middle-market sell-side advisory firm focused on owner-operated and family-owned businesses across home services, light industrial, business services, healthcare-adjacent verticals, and specialty distribution. We run sell-side mandates between $3M and $75M in enterprise value, with a process designed around the founder’s specific outcome (full exit, partial recap, succession to a strategic, or rollup into a private equity platform). Every mandate is led by a managing director from kickoff to close. We do not pass mandates to associates and we do not represent buyers on the same transactions where we represent sellers.

How Boutique Investment Banks Get Paid: Success Fees and Retainers

Every boutique investment bank’s compensation has the same three components, in varying proportions: an upfront engagement fee, a monthly retainer, and a success fee. The mix between these three components is the single most important economic term in the engagement letter, and it tells you a lot about how the firm thinks about your deal.

Upfront engagement fee. A one-time fee paid at signing, typically $25,000 to $250,000 depending on the firm and the deal size. The engagement fee covers the firm’s initial work on the confidential information memorandum, financial model, and buyer list, and it confirms that the founder is serious about transacting. Most boutique investment banks credit the engagement fee against the success fee at close.

Monthly retainer. A recurring fee paid each month the engagement is active, typically $10,000 to $50,000 per month for lower-middle-market deals and $25,000 to $150,000 per month for larger transactions. The retainer compensates the firm for ongoing process work between milestones. Most boutiques also credit retainer payments against the success fee at close, so the founder is not paying for the work twice.

Success fee. The biggest component, paid at closing as a percentage of transaction value. Success fees range from roughly 1% on $500M+ deals to 5% or more on $5M to $15M lower-middle-market transactions. The success fee structure is almost always tiered, using some variant of the Lehman Formula or its modified versions.

The general rule: the smaller the deal, the more the fee shifts toward the success fee and away from the retainer. A $1B sell-side mandate at an elite boutique might have a $250,000 engagement fee, $100,000 monthly retainer, and 0.8% success fee. A $15M sell-side mandate at a lower-middle-market boutique might have a $25,000 engagement fee, $10,000 monthly retainer, and 5% success fee with a $400,000 minimum.

Founders sometimes ask whether they can negotiate a pure success-only engagement. Reputable boutique investment banks generally will not take pure-contingency mandates because the structure creates bad incentives: the firm has no skin in the game until close, which encourages taking only the easiest deals. A modest retainer with a healthy success fee is the structure that aligns the firm with the founder.

The Lehman Formula and Double Lehman: Fee Structure Explained

The Lehman Formula is the original tiered success fee structure, developed by Lehman Brothers in the 1960s for capital-raising transactions. It is the conceptual ancestor of almost every boutique investment bank fee schedule in use today. Most modern engagements use a modified version, but understanding the original formula is the foundation for reading any engagement letter.

The Original Lehman Formula (5-4-3-2-1)

The classic Lehman Formula is a marginal percentage structure:

5% on the first $1M of transaction value
4% on the second $1M
3% on the third $1M
2% on the fourth $1M
1% on every dollar above $4M

On a $10M deal, the original Lehman Formula produces a success fee of $50,000 + $40,000 + $30,000 + $20,000 + $60,000 = $200,000, or 2% of transaction value. On a $50M deal, the fee is $140,000 + $460,000 = $600,000, or 1.2% of transaction value. On a $100M deal, the fee is $1.1M, or 1.1% of transaction value. The original formula was designed for an era when $1M was a meaningful number; it produces fees that are too low for modern lower-middle-market deals.

The Double Lehman Formula (10-8-6-4-2)

The Double Lehman doubles every tier of the original formula:

10% on the first $1M
8% on the second $1M
6% on the third $1M
4% on the fourth $1M
2% on every dollar above $4M

On a $10M deal, the Double Lehman produces a fee of $100,000 + $80,000 + $60,000 + $40,000 + $120,000 = $400,000, or 4% of transaction value. On a $25M deal, the fee is $280,000 + $420,000 = $700,000, or 2.8%. The Double Lehman is the most common structure in true lower-middle-market deals (sub-$25M) where the work per deal is roughly fixed regardless of size.

The Modified Lehman

The Modified Lehman is a catch-all term for any tiered formula that does not strictly follow the original or doubled structure. Common variants include 8-6-4-2-1 (used on $10M to $50M transactions), 6-5-4-3-2-1 with a sixth tier (used on $25M to $100M transactions), or flat percentages with a minimum (5% with a $400,000 floor on sub-$10M deals). The variant your boutique investment bank proposes will reflect the deal size, the expected complexity, and the firm’s standard practice.

The Reverse Lehman

The Reverse Lehman flips the structure: low percentages on the early dollars and higher percentages on dollars above certain thresholds. Reverse Lehman structures are most common on auctions where the founder wants to incentivize the banker to push price above a known floor. A typical Reverse Lehman might pay 1% on the first $20M of value, 3% on value from $20M to $30M, and 5% on value above $30M. The structure works when there is a clear strategic premium available that requires aggressive negotiation.

Pure Percentage with Minimum

The simplest fee structure is a flat percentage with a minimum: 4% of transaction value with a $400,000 minimum, for example. This structure is common on sub-$10M deals where the math of a tiered formula gets noisy. The minimum ensures the firm earns enough to justify the work; the percentage ensures the founder pays proportionally to the outcome.

When to Hire a Boutique vs a Business Broker

The line between a boutique investment bank and a business broker is real, and it has practical consequences for the outcome of your sale. The simplest rule: boutique investment banks run competitive processes for businesses with enough complexity and value to attract sophisticated buyers, while business brokers list smaller businesses (typically Main Street businesses under $2M to $3M in revenue) on marketplaces where individual buyers shop.

The differences across the dimensions that matter:

Deal size. Boutiques work on $3M+ enterprise value transactions; brokers work on $250K to $2M transactions.
Buyer universe. Boutiques target strategic acquirers, private equity firms, and family offices through direct outreach; brokers list on BizBuySell and similar marketplaces.
Process. Boutiques run structured sell-side auctions with NDAs, IOI deadlines, management presentations, and bid rounds; brokers post listings and respond to inbound interest.
Valuation approach. Boutiques use trading comps, transaction comps, DCF, and LBO models; brokers typically use SDE multiples from comparable listings.
Marketing materials. Boutiques produce 50- to 100-page confidential information memoranda; brokers produce one- to five-page listing descriptions.
Regulatory status. Boutiques are registered broker-dealers under FINRA; most brokers operate under state business broker licenses or the 2023 SEC M&A broker exemption.
Fee structure. Boutiques charge engagement fees, monthly retainers, and tiered success fees; brokers typically charge success fees only, often 10% to 12% with no retainer.

The rule of thumb: if your business has more than $1M of EBITDA and operates in a category that attracts private equity or strategic interest, you are paying too much in lost value by using a business broker instead of a boutique investment bank. The higher fees of the boutique are paid for many times over by the higher price.

When the Bulge Bracket Beats the Boutique

Boutique investment banks are the right choice for most lower-middle-market and middle-market deals. There are scenarios, however, where the bulge bracket is genuinely the better choice, and it is worth being honest about them.

Deal size above $1B. When the buyer universe is global Fortune 500 strategics and the largest private equity firms, the bulge bracket’s relationships and process capacity are difficult to match. Elite boutiques compete here, but the bulge bracket still wins a majority of $5B+ mandates.

Stapled financing. If the sale requires substantial new debt (a $500M buyout financed with new senior debt), a bulge-bracket firm can offer stapled financing: a pre-negotiated debt package the buyer can use or reject. Boutiques cannot, because they do not have lending balance sheets.

Cross-border complexity. A deal involving jurisdictions where the bulge bracket has multiple thousand professionals on the ground (China, India, Brazil) can be better served by the bulge bracket’s global reach. Elite boutiques have closed the gap, but for genuine emerging-market complexity, the bulge bracket still has more local capacity.

Capital markets layered onto the M&A. If the seller plans to take part of the consideration in buyer equity and then sell it through a secondary offering, the bulge bracket’s distribution becomes valuable. Boutique investment banks can syndicate to other broker-dealers but do not have first-party retail distribution.

For every other deal, including most $500M and below transactions, the boutique investment bank is the right choice.

How to Choose a Boutique Investment Bank for Your Sale

Choosing a boutique investment bank is the single most important decision a founder makes in a sale process, more important than the legal counsel, the accounting firm, or any of the other advisors. The wrong bank produces a mediocre outcome on a good company. The right bank produces a great outcome on the same company. Here is the diligence checklist.

Verify FINRA Registration

Pull the firm’s BrokerCheck record at brokercheck.finra.org. Confirm the firm is registered as a broker-dealer. Pull the BrokerCheck records on the individual managing directors who will work your deal. Look for disclosed customer complaints, regulatory actions, or terminations for cause. Any disclosed events deserve a direct conversation before you sign.

Confirm Sector Track Record

Ask for a tombstone book of the firm’s closed transactions in your sector over the last 36 months. You want at least three to five closed deals in your specific vertical, not adjacent verticals. A boutique that has closed two deals in commercial HVAC service and one in residential plumbing is in your lane. A boutique that has closed deals in industrial chemicals and aerospace components is not, even if it is technically called an industrials practice.

Identify the Lead Banker

Ask explicitly who will run your deal day-to-day. Get a name. Get that person on the second meeting. Confirm that the lead banker is on every call from kickoff to close. If the firm pitches a managing director and then proposes that a vice president will actually run the process, that is a bait-and-switch. The whole point of a boutique investment bank is senior attention; do not accept a substitute.

Review the Buyer List

Ask for a draft buyer list before you sign. A serious boutique investment bank should produce a list of 50 to 150 likely strategic acquirers, financial sponsors, and family offices in your category within a week. The quality of the list tells you everything about the firm’s relationships.

Read the Engagement Letter Carefully

Pay particular attention to the tail period (typically 18 to 24 months after termination, during which a sale to any buyer the bank introduced still triggers a success fee), the definition of transaction value (does it include assumed debt, earnouts, rolled equity, escrows?), the minimum fee, the expense reimbursement provisions, and the termination rights. Our deeper treatment is in investment banker engagement letter explained.

Check References and Process

Ask for three references from closed sell-side mandates in the last 24 months and call them. Did the lead banker stay on the deal? Did the process generate competitive tension? Was the final outcome better than what the founder expected at the start? A well-run lower-middle-market sell-side process takes four to seven months from kickoff to close; compare what the firm describes to the framework in investment banking process for selling a company.

Discuss Valuation and Auction Mechanics

A real boutique investment bank should walk you through trading comps, transaction comps, DCF, and LBO analysis, and give you a tight valuation range. Deeper treatment in how investment bankers value a business. They should also walk you through their bid round mechanics step by step. The standard framework is in how investment bankers run a sell-side auction.

For the full decision framework on choosing among boutique investment banks, see how to choose an investment bank for selling a business. For the direct comparison between boutiques and the bulge bracket, see boutique investment bank vs bulge bracket.

How CT Acquisitions Compares to Other Boutiques

CT Acquisitions is a lower-middle-market boutique investment bank focused on owner-operated businesses across home services, light industrial, business services, healthcare-adjacent categories, and specialty distribution. We are not the right firm for a $500M technology transaction or a $1B cross-border industrial deal. We are the right firm for a founder selling a $5M to $75M business in a vertical we know well to a strategic acquirer or private equity platform that we already have a relationship with.

The structural choices that define how we work:

Senior banker leadership. Every CT Acquisitions mandate is led by a managing director from kickoff to close. We do not pass mandates to associates after the engagement is signed. The senior banker who pitches your deal is the senior banker who runs your deal.
Vertical focus. We work in a focused set of categories where we have direct buyer relationships, not every industry. The buyer outreach in our sectors hits the actual decision-makers because we have already worked with them.
Sell-side only. We do not represent buyers on the same transactions where we represent sellers. Our economic interest is aligned with the founder, not split between the seller and the buyer.
Structured process. Every CT Acquisitions mandate runs through a structured calendar: kickoff and diligence (weeks 1 to 4), CIM and buyer list (weeks 4 to 8), buyer outreach and IOIs (weeks 8 to 14), management presentations and LOIs (weeks 14 to 20), exclusivity and close (weeks 20 to 28).
Transparent fees. We use a Double Lehman or Modified Lehman structure with a modest engagement fee and monthly retainer, both credited against the success fee at close. The full fee schedule is in every engagement letter we send.
Conflict-free. We do not have a lending balance sheet, a trading desk, or a proprietary buyer fund. The advice you get from a CT Acquisitions banker is the advice the banker thinks is right for you.

If you are considering selling your business and you want to talk through whether a boutique investment bank fits your situation, the right starting point is a confidential conversation. We can walk through your business, your goals, and the realistic range of outcomes before you decide whether to engage anyone.

Boutique Investment Banks: Frequently Asked Questions

What is the difference between a boutique investment bank and a bulge-bracket bank?

A boutique investment bank is an advisory-only firm focused on M&A, restructuring, capital raises, and fairness opinions. A bulge-bracket bank is a global universal bank that offers M&A advisory alongside sales and trading, asset management, wealth management, lending, and underwriting. The structural difference produces practical differences in senior attention, sector depth, conflicts of interest, and fee economics. Boutique investment banks tend to staff senior bankers on every deal and operate without lending or trading conflicts; bulge-bracket banks tend to staff junior bankers day-to-day and may have lending or trading relationships with the buyer.

How much do boutique investment banks charge for sell-side M&A?

Boutique investment bank fees typically include three components: an upfront engagement fee ($25,000 to $250,000), a monthly retainer ($10,000 to $150,000), and a tiered success fee at close. The success fee structure is usually a variant of the Lehman Formula. On lower-middle-market deals ($5M to $25M), the all-in fee typically lands between 3% and 6% of transaction value. On middle-market deals ($25M to $250M), the all-in fee typically lands between 1.5% and 3%. On larger deals ($250M+), the fee compresses further toward 0.8% to 1.5%.

What is the Lehman Formula in M&A fees?

The Lehman Formula is a tiered success fee structure originally developed by Lehman Brothers in the 1960s. The classic version pays 5% on the first $1M of transaction value, 4% on the second $1M, 3% on the third $1M, 2% on the fourth $1M, and 1% on every dollar above $4M. The Double Lehman doubles every tier (10-8-6-4-2). Most modern lower-middle-market boutique investment banks use the Double Lehman or a Modified Lehman variant because the original formula produces fees that are too low for the work required on smaller transactions.

Are boutique investment banks regulated?

Yes. Boutique investment banks that earn transaction-based compensation on securities transactions must be registered as broker-dealers with FINRA and the SEC, with limited exemptions. The 2023 SEC no-action relief for M&A brokers carved out a narrow category of firms that advise on the sale of privately held operating companies under certain conditions. When vetting a boutique investment bank, the first verification step is to pull the firm’s FINRA BrokerCheck record and the individual bankers’ BrokerCheck records at brokercheck.finra.org.

Can a small business owner hire a boutique investment bank?

Yes, if the business is large enough to attract sophisticated buyers. Most lower-middle-market boutique investment banks set a minimum deal size between $3M and $10M in enterprise value. Below that floor, the math of a sell-side process (engagement fee, retainer, success fee, transaction expenses) does not produce a net result that is meaningfully better than a business broker engagement. Above that floor, the boutique investment bank typically produces a higher price, better terms, and a smoother process than a broker, and the higher fees are paid for many times over by the higher outcome.

How long does a boutique investment bank engagement last?

A typical lower-middle-market sell-side engagement runs four to seven months from kickoff to close, with another 30 to 90 days for transition and post-close obligations. The phases are roughly: kickoff and diligence (weeks 1 to 4), CIM and buyer list development (weeks 4 to 8), buyer outreach and indications of interest (weeks 8 to 14), management presentations and letters of intent (weeks 14 to 20), exclusivity and definitive documentation (weeks 20 to 28). Larger or more complex transactions can run nine to 12 months. The engagement letter typically also includes a tail period of 18 to 24 months after termination, during which a sale to any buyer the boutique investment bank introduced still triggers the success fee.