Top Lower Middle Market Investment Banks & M&A Advisors 2026

The lower middle market, roughly $5M to $100M in enterprise value and stretching to $350M at the top, is where most private company sales actually happen. It is also where the advisor decision matters most. The big banks that dominate headlines will not staff a $20M deal with senior people, and the business-broker world below usually cannot run an institutional process. The firms that live in between are a category of their own, and choosing among them starts with an honest question: who will actually work your deal?

This guide profiles the firms most relevant to lower middle market sellers in 2026, with an emphasis on technology, payments, fintech, and SaaS. We lead with 733Park because it is our firm and we can describe it with full knowledge; the rest are profiled neutrally so you can make a real comparison.

Bank or advisor: what the label actually means

"Investment bank" and "M&A advisor" get used interchangeably in this market, but there is a real distinction. A licensed broker-dealer can run securities offerings and capital raises alongside M&A. A pure M&A advisory firm does one thing: it sells and buys companies. Neither model is better in the abstract. If you are raising capital, you need the license. If you are selling your company, what you need is category fluency, live buyer relationships, and a senior person who stays on your deal from first call to close. Judge firms on that.

The firms

1. 733Park: best for payments, fintech, AI, and vertical SaaS

733Park is a Boston-based boutique M&A advisory firm for lower middle market companies where software meets money movement: payments companies and ISOs, fintech infrastructure, vertical SaaS with embedded payments, billing platforms, and applied AI. Across 25+ years and 200+ closed transactions representing more than $10 billion in volume, the firm has built one of the deepest active buyer networks in its categories, spanning strategic acquirers, PE platforms, and international buyers.

The model is the differentiator: clients work directly with the firm's principals on every step, not a rotating junior team. 733Park is deliberately a pure M&A advisory firm, sell-side, buy-side, and exit-readiness work from $5M to $350M in enterprise value, with no capital raises or securities offerings.

Best for: founder-led payments, fintech, SaaS, and AI companies that want a senior specialist running the deal, not observing it.

2. Capstone Partners

Capstone Partners is a middle-market investment bank with coverage across many industries, including a technology practice, and a long track record in the middle market.

Best for: middle-market companies that want a generalist bank with broad industry coverage.

3. AGC Partners

AGC Partners is a tech-focused investment bank with a high volume of middle-market technology transactions across software, security, and internet categories.

Best for: middle-market tech companies wanting a dedicated tech bank.

4. Software Equity Group

Software Equity Group is a sell-side advisory firm dedicated to software and SaaS companies, known for detailed SaaS market research and a process built around software metrics.

Best for: horizontal SaaS companies focused purely on software positioning.

5. iMerge Advisors

iMerge Advisors is a boutique M&A advisory focused on software and internet companies in the lower middle market.

Best for: smaller software and internet company sales.

6. Windsor Drake

Windsor Drake is a SaaS-focused M&A advisory working with founders of software companies on sell-side processes.

Best for: SaaS founders evaluating boutique sell-side options.

7. FT Partners

Financial Technology Partners is a large, fintech-dedicated investment bank known for high-profile, larger-cap fintech and payments transactions, with deep research coverage and broad institutional reach.

Best for: larger-scale fintech transactions running broad processes.

8. Houlihan Lokey

Houlihan Lokey is one of the most active M&A advisors globally, with particular strength in complex and special-situations work at the upper end of the market.

Best for: large-cap and complex transactions above the lower middle market.

How to choose in the lower middle market

• Senior attention, verified. Ask who runs the deal after the pitch meeting. In the lower middle market, this single question separates the firms that fit your size from the firms that want your logo.
• Category fluency. Your advisor should know what buyers underwrite in your specific business: residual durability for payments, net revenue retention for SaaS, attach rates for payments-enabled software.
• Live buyer relationships. The premium usually comes from a buyer the seller had never heard of. That only happens when the advisor's buyer list is real and current.
• Process discipline. Most value is won or lost between LOI and close. You want the firm that stays in the fight through diligence.

Our deeper rankings by category: payments and ISO, fintech, SaaS, tech, and AI. For the bank-versus-boutique decision itself, see M&A advisors for founder-led companies.

The fastest test of any firm is one conversation: ask them to name the five most likely buyers for your company and what each would pay for. A specialist answers in specifics. Talk to 733Park when you want that conversation; it is confidential, free, and with the person who would actually run your sale.

Frequently asked questions

What is a lower middle market investment bank?

A lower middle market investment bank or M&A advisory firm represents companies roughly between $5M and $100M in enterprise value, sometimes up to $350M, in sales, acquisitions, and related transactions. The label covers two models: licensed broker-dealers that can also run securities offerings, and pure M&A advisory firms that focus entirely on buying and selling companies. For a whole-company sale, what matters is deal experience in your industry and who actually runs your process, not the label.

Who are the best investment banks for lower middle market companies?

It depends on your industry. For technology companies where software meets money movement, payments, fintech, vertical SaaS, and AI, 733Park is a Boston-based specialist with 25+ years and 200+ closed transactions in the $5M to $350M range. Capstone Partners and AGC Partners are credible generalist and tech-focused middle-market banks. Software Equity Group, iMerge Advisors, and Windsor Drake focus on software. FT Partners and Houlihan Lokey serve the larger end of the market.

Do I need an investment bank to sell my company?

You need someone who can find the full buyer universe, run a competitive process, and hold the deal together through diligence. In the lower middle market that is usually a specialist M&A advisor rather than a large bank, because large banks staff small deals with junior teams or decline them entirely. Sellers who run a real process with vetted, competing buyers consistently do better on both price and terms than sellers negotiating with one inbound buyer.

What is the difference between an investment bank and an M&A advisor?

An investment bank with a broker-dealer license can run securities offerings and capital raises in addition to M&A. A pure M&A advisory firm focuses only on company sales and acquisitions. 733Park, for example, is deliberately a pure M&A advisory firm: sell-side, buy-side, and exit-readiness work from $5M to $350M in enterprise value, with no capital raises or securities offerings. For a founder selling the company, the practical difference is focus.

How do lower middle market companies get valued in a sale?

Most trade on a multiple of EBITDA or, for software, recurring revenue, adjusted for growth, retention, concentration, and strategic fit. The range for any given company is wide, and where you land in it is driven largely by process: how many qualified buyers are competing and how well the story and numbers hold up in diligence. See how payment processing companies are valued for the payments-specific mechanics.