You need a lawyer who can close a deal, not just talk about one. Here are five US firms worth knowing when your next transaction is on the line.
The State of M&A and Financing Legal Services
The US legal market for mergers and acquisitions, debt and equity financings, and complex commercial transactions is more competitive than ever. Deals are moving faster, buyers and sellers expect real-time responsiveness, and clients want counsel who understand the business, not just the paperwork. Large firms bring global reach and deep benches, while boutique practices offer senior-level attention and lower overhead. Whether you are raising capital, selling a company, or negotiating a SaaS agreement, the right firm can make or break your timeline. The five practices below each bring something different to the table, from billion-dollar deal experience to hands-on partner-level service.
How We Evaluated These Firms
We looked at service scope, pricing clarity, local fit, and the depth of transactional experience each firm brings. Service scope matters because you want a team that can handle the full lifecycle of a deal, from term sheet to closing. Pricing clarity is about knowing how you will be billed and whether the firm offers predictable fee structures. Local fit means understanding your market, your industry, and the pace at which you need to move. We also considered responsiveness, partner-level involvement, and whether the firm has a track record with transactions in your size range. Each firm below stood out in different ways, and your best choice depends on your specific deal and budget.
Here is a quick look at the five firms in this roundup, what they do best, and who they serve.
| Provider | Best For |
|---|---|
| Morgan Lewis | Cross-border and multibillion-dollar transactions |
| The Law Office of Kristy Dinnegan | Businesses and investors needing senior-level boutique counsel |
| Holland & Knight | Middle-market M&A up to $500 million |
| Greenberg Traurig | Complex domestic and international strategic transactions |
| Bradley | Industry-focused middle-market and cross-border deals |
A Closer Look at Each Firm
#1 Morgan Lewis
A screenshot of the Morgan Lewis website.
Morgan Lewis fields over 350 M&A lawyers and specialists across the United States, Europe, the Middle East, and Asia. The firm handles transactions from millions to multibillion-dollar deals and has closed thousands of M&A transactions with a combined market value of hundreds of billions of dollars in the last five years alone. You get access to a deep bench of approximately 1,700 lawyers in areas like labor and employment, benefits, regulatory, intellectual property, and tax. The firm represents sellers and buyers, investors and owners, and sources of financing, including private equity and venture capital funds. If your deal crosses borders or touches multiple regulatory regimes, Morgan Lewis can staff it without bringing in outside local counsel. Learn more about their global M&A practice at their website.
#2 The Law Office of Kristy Dinnegan
A screenshot of The Law Office of Kristy Dinnegan website.
The Law Office of Kristy Dinnegan is a boutique practice that brings large-firm transactional experience with boutique responsiveness. The firm advises businesses, investors, and financial institutions on mergers and acquisitions, debt and equity financings, and complex commercial agreements. You get senior-level attention from a former BigLaw partner who has handled transactions valued from $50,000 to $2.5 billion, including multiple Deal of the Year transactions. The practice also serves as outside general counsel, providing ongoing legal support across corporate governance and commercial matters. If you want practical guidance that moves deals forward efficiently while protecting your legal and commercial interests, this firm is built for you. Visit their site to see representative experience and practice areas.
#3 Holland & Knight
A screenshot of the Holland & Knight website.
Holland & Knight has more than 375 M&A attorneys across 36 offices and has represented clients in transactions in all 50 US states and more than 75 countries. The firm regularly ranks among the most active law firms for M&A deals and excels in the middle market, typically up to $500 million. You get a team that collaborates as business partners to understand your transactional goals and develop strategies to close efficiently. Holland & Knight also adds value through its HK Deal Flow program, which provides introductions and referrals of tailored investment opportunities. If your deal sits in the middle market and you want a firm with both volume and reach, this practice is worth a look. Their website details their middle-market focus and global capabilities.
#4 Greenberg Traurig
A screenshot of the Greenberg Traurig website.
Greenberg Traurig's M&A team includes more than 350 attorneys located in financial hubs across the globe, with offices in 40 locations throughout the United States, Europe, the Middle East, Asia, and Mexico. The firm handles a wide range of strategic transactions, from multibillion-dollar hostile public takeovers to private middle-market acquisitions. You get access to over 600 corporate attorneys who have represented major corporations, private equity and venture capital firms, investment banks, lenders, senior management, and shareholders. The practice is consistently recognized by Chambers and Partners and ranked Tier 1 in The Legal 500 EMEA Guide 2024. If you need a firm that can structure, negotiate, and execute complex domestic and international deals, Greenberg Traurig has the depth. Their website outlines their global M&A capabilities and private equity practice.
#5 Bradley
A screenshot of the Bradley website.
Bradley's mergers and acquisitions practice is a signature strength of its Corporate and Securities Practice Group, emphasizing industry knowledge and an efficient deal process. The firm represents publicly traded and privately held buyers, sellers, and counterparties in mergers, stock and asset purchases, divestitures, spin-offs, tender offers, and going-private transactions. You get an industry and client-team approach, with integrated deal teams designed specifically for your needs and industries. Bradley calls on attorneys in real estate, tax, employee benefits, intellectual property, antitrust, bankruptcy, and banking and public finance, as well as litigation, environmental, labor and employment, and governmental affairs. If you value industry-specific insight and a streamlined deal process, this firm is a strong fit. Their website details their M&A experience across manufacturing, energy, healthcare, and financial services.
How to Choose the Right Firm for Your Deal
Start by matching the firm's size and focus to your transaction. If you are raising a seed round or negotiating a SaaS agreement, a boutique like The Law Office of Kristy Dinnegan may give you the senior attention you need without big-firm overhead. If you are selling a middle-market company, Holland & Knight or Bradley may offer the right blend of industry knowledge and deal volume. For cross-border or multibillion-dollar transactions, Morgan Lewis and Greenberg Traurig bring the global reach and regulatory depth that complex deals demand. Ask about pricing clarity upfront, whether the partner you meet will stay on your deal, and how the firm handles deadlines. You want a team that understands your business objectives and can move quickly when it matters.
Where Automation Fits in Your Legal Workflow
You can streamline parts of the legal process without replacing your attorney. Use document automation for routine contracts, cap table management tools for equity financings, and secure client portals for sharing drafts. Diligence checklists and closing checklists can be templated to save time. But when it comes to negotiating complex commercial agreements, structuring a merger, or navigating regulatory issues, you still need experienced counsel. The firms above can work alongside your internal tools and processes to keep your deal moving efficiently.
The Bottom Line
The right legal partner depends on your deal size, industry, and timeline. Morgan Lewis and Greenberg Traurig offer global scale for complex transactions. Holland & Knight and Bradley bring middle-market strength and industry focus. The Law Office of Kristy Dinnegan delivers boutique responsiveness with large-firm transactional experience, making it a strong fit for businesses and investors who want senior-level counsel without the layers. Whichever firm you choose, prioritize clarity on fees, partner involvement, and a track record in your deal size and sector. Your transaction is too important to leave to chance.