M&A law firm business development: the work after a deal is agreed

Why deal counsel is usually taken before you hear about a deal

By the time a deal is announced, someone has already negotiated the purchase agreement. That is deal counsel, usually on both sides, and those seats are filled. A letter pitching the buyer on the deal it just signed is wasted, and one to the seller can be worse if your firm is anywhere near the other side.

What is still open is everything the signature sets in motion. The buyer has to pay for the company, keep its people, customers, sites and licenses, and fold it into its own business. A seller carving out a division has to separate it from what it keeps. Each is its own workstream, often run by a different person, and deal counsel does not always get it.

The Thomson Reuters Institute's Law Firm Financial Index shows why that matters. M&A demand grew 4.4% year over year in Q1 2026, the institute said M&A work pipelines started stalling in March as dealmakers waited for clarity, and M&A demand growth slowed to 0.9% in Q2. In Q2, demand grew 3.6% year over year in real estate, 3.5% in corporate overall and 3.4% in labor and employment. Those figures cover the Am Law 100, Second Hundred and midsize firms in the institute's data, not every US firm. Two quarters prove little, and those practice figures cover far more than deal work, but they are a reason for an M&A group not to rely on deal counsel seats alone.

Run conflicts on every party before you pitch

A deal has more parties than the headline shows: buyer, seller, target, the sponsor behind the buyer, lenders and often management. If your firm is on one side, do not pitch the other. ABA Model Rule 1.7 bars representation directly adverse to a current client without informed consent, confirmed in writing, and its comment applies that to deals: representing the seller of a business against a buyer you represent in an unrelated matter needs informed consent from each client.

Deals also create conflicts after the fact, as when a company a lawyer is suing for one client is bought by another client. So run every known party through your conflicts process, not only the company you plan to write to.

Two more rules belong in that check. Under Rule 1.18, anyone who consulted your firm about possibly hiring it for a matter is a prospective client, and even if you were never hired you generally may not use or reveal what you learned from them. Under Rule 1.8(b), you may not use information relating to a client's representation to that client's disadvantage without informed consent.

Confidentiality reaches your marketing too. Rule 1.6 covers information about a client's deal, and ABA Formal Opinion 480 says the duty holds in public commentary even when the details are already out. So no naming a client's deal in an alert, a post or a pitch without consent.

The legal work an agreed deal creates

Each row is a common pattern. What a deal creates depends on its size, structure and industry, and some of it stays with deal counsel.

Much of this lands after closing, when the deal team has moved on. The buyer's general counsel inherits the target's contracts, people, sites and disputes at once, and may need depth in a state or practice the deal firm does not cover. Post-closing fights over price adjustments, earn-outs and indemnity belong on the list too, and they go through the conflicts check first. If one of these is your practice, see the guides for commercial real estate practices, trade and customs practices and government contracts practices.

Add-on acquisitions: the buyer that comes back

Private equity sponsors commonly buy a platform company, then grow it by buying smaller companies in the same field. Each add-on repeats the cycle: a purchase agreement, diligence, often an amendment to the platform's credit facility, then integration of contracts, people, sites and systems. A platform built to buy tends to buy again, so learn how it staffs its deals.

Who picks counsel varies. Some sponsors keep every deal with one firm; others let the platform's general counsel or CFO choose for smaller deals or the integration around them. Find out from someone who knows the company instead of guessing.

The integration work is the steadier opening. Each add-on can bring its own leases, employees, customer contracts and sometimes licenses in new states. A firm handling one piece of a platform's integration is well placed for the next.

Who hires outside counsel once the deal is signed

Whoever hired deal counsel often does not hire for what follows. At the buyer, the general counsel usually owns outside counsel decisions, but financing runs through the CFO, employment through HR and legal, and real estate through whoever runs the sites. At a smaller buyer with no in-house lawyer, the CEO or owner decides. More on that in the general counsel role and how companies choose outside counsel.

At the target, things shift after closing: its top lawyer may stay, join the buyer's legal team or leave, and the buyer's general counsel often takes over its outside counsel relationships. For integration work, start with the buyer.

An introduction from someone the general counsel already trusts usually beats any letter. Before writing, check who at your firm knows the buyer's general counsel, CFO or sponsor deal team from a past matter, a board or a prior job, and which clients or contacts outside the firm know them too. Warm introductions covers how to map that. Let an outside introducer decide whether and what to say, in their own words: do not hand them a script about the deal, and do not reward them beyond what ABA Model Rule 7.2(b) allows, such as a nominal thank-you gift.

Solicitation rules for reaching out after a deal

This is not legal or ethics advice. Solicitation rules differ by state and some changed in 2026, so check your own state's version and ask ethics counsel when in doubt. Under ABA Model Rule 7.3(a), a message to a specific person you know or reasonably should know needs legal services in a particular matter, offering help with that matter, is a solicitation. A note to a buyer about the work its acquisition creates can fit that definition, so treat it as one.

• Default to a truthful written first touch. The ABA comment to Rule 7.3 names mail and email as the alternative to live contact.
• No cold calls, video calls or in-person approaches to a stranger about their deal. ABA Rule 7.3(b) bars live person-to-person solicitation for pecuniary gain unless the person is a lawyer, has a family, close personal or prior business or professional relationship with you or your firm, or routinely uses that type of legal service for business purposes. Keep DMs and chat out of a first touch too: some state rules, California's among them, reach real-time electronic contact.
• That last exception is narrow. A serial acquirer's general counsel who routinely hires deal lawyers may fit it for deal work; a founder buying a company for the first time may not. This guide's default stays written.
• California has no business-purposes exception, also bars real-time electronic solicitation, and generally requires "Advertisement" or similar words on written or electronic solicitations to someone known to need help in a particular matter.
• Florida's advertising committee has found cold calls to be prohibited solicitation. Unsolicited emails to prospective clients must start the subject line with "Advertisement", include a qualifications statement covering experience with similar matters and, when prompted by a specific occurrence involving the recipient, say how the lawyer got the information. They generally must go to the Bar for review at least 20 days before first use.
• New York largely adopted the ABA's 2018 approach effective June 1, 2026, adding the business-purposes exception and dropping the "Attorney Advertising" label and the old duty to send solicitation copies to the disciplinary committee.
• No "Urgent", no "Action required", nothing that looks like a legal notice or implies you have already analyzed their problem. Under the Rule 7.1 comment, a truthful message still misleads if it makes the reader think action is required when none is.
• No "certified" without naming the approved certifying body (Rule 7.2(c)), no "best M&A firm", and no past results framed to set expectations.
• Do not have BD staff or an agency make live contact you could not make yourself; ABA Formal Opinion 501 explains when a lawyer answers for solicitation by others. If someone says they do not want to hear from you, stop: Rule 7.3(c) bars soliciting them.

What a useful first note looks like after a deal

Keep it short and about their work. Name the partner who would do it. Say which post-closing work you handle, in plain terms: landlord consents across a multi-site footprint, benefit plan transitions, license transfers, a trade compliance review for a newly acquired importer. Offer something useful with no strings, such as a checklist of the consents that change-of-control clauses commonly trigger, and make it easy to say no.

Leave out any client's name or deal without consent, any claim about outcomes, and anything implying you know more about their deal than you do. Add what your state requires, such as Florida's disclosures. If they decline, that is the end of it. For the weekly habit behind notes like this, see business development for lawyers.

Where Clean fits for an M&A practice

Clean finds companies at moments that create legal work, and an agreement to buy, sell or merge is one of them. For each company, Clean gives the reason, the practice area it touches and the person who hires outside counsel, usually the general counsel, the CEO or the owner, plus who in your team's network can introduce you. Open any company to see the work ahead and every record behind it, each with a note on the legal work it creates. The practice area tells you which partner should reach out and what to open with.

You set what Clean looks for by industry, company size, region and the kind of matter you want, and you can leave out current clients. That is a convenience, not a conflicts check. Clean works from real-world records, not intent data, and it is not a contact database or a list vendor. It does not send messages for you; your lawyers decide whether and how to reach out.

Book a demo to see companies in your market with a moment that creates work in your practice, and who to reach. See how Clean works, and the other moments that create legal work on Clean for law firms.