Law firm mergers are being signed at the fastest pace in years. What the press releases don’t cover is what happens the morning after.
Fairfax Associates tracked 59 completed law firm mergers in 2025, an 18% increase over 2024, with 16 more already announced for 2026, including three combinations where both firms have more than 400 lawyers. The deals are driven by familiar pressures: modest demand growth, rising overhead, and the need for scale to fund AI and talent investments in an increasingly expensive market. The strategic logic is sound. The operational reality is harder.
Every merger creates an immediate conflicts clearance problem. Conflicts clearance is the process by which a firm identifies whether a new client, matter, or attorney relationship creates a legal or ethical conflict with existing or former representations and resolves it before work begins. In a functioning firm, that process is already resource-intensive. In a merger, it has to run across two firms’ full client and matter histories at once, before a single new matter can open under the combined name. The clearance work doesn’t wait for the technology integration to finish. It starts on day one.
Why law firm mergers create a conflicts crisis before integration is complete
A merger doubles the data load overnight without doubling the team. At Am Law 200 firms, conflicts departments typically staff between 10 and 30 people under normal operating conditions. When two firms combine, the clearance team inherits thousands of representations, former client relationships, adverse party histories, and pending matters from the acquired firm. None of which were visible to them the week before.
The exposures that follow are specific. One firm may currently represent a client that is adverse to a party the other firm has represented for years. A partner joining from the acquired firm may carry a former client relationship that triggers a screen obligation no one has documented yet. Two matters that were clean at their respective firms become a conflicts problem the moment both firms share a letterhead.
At firms running manual or semi-automated clearance processes, reconciling all of this can take weeks. During those weeks, the combined firm is technically operating, onboarding laterals, responding to client requests, opening matters, while the underlying conflicts picture remains unresolved. That is where disqualification motions originate. It is also where malpractice insurers start paying attention: Miller Insurance, which advises law firms through mergers, identifies conflicts of interest procedures as a key underwriting consideration that insurers scrutinize in any combination, noting that the acquired firm’s claims history becomes part of the successor firm’s record from day one.
The lateral hiring problem compounds the merger problem
Merger activity in 2026 is happening against a backdrop of record lateral partner hiring. Firm Prospects recorded 3,009 lateral partner hires across the Am Law 200 in 2025, a five-year high and a 10% increase over the year before, with litigation leading at 26% of moves. Each lateral hire brings the full client and matter history of their prior firm into the conflicts database. In a merger year, firms are running both clearance workflows simultaneously: the combination itself and the ongoing flow of lateral candidates, each of whom needs to be cleared before billing a single hour.
Conflicts departments built for steady-state operations were not designed for this. The question managing partners are quietly asking is whether their clearance infrastructure can handle both workloads at once and whether a missed conflict during a high-volume integration period will surface two years later in a motion to disqualify.
What a clean conflicts integration actually requires
Clearing conflicts across a merger isn’t a data migration question. It requires the ability to run searches across both firms’ matter histories simultaneously, surface potential conflicts with enough context for a reviewer to make a call quickly, and document the resolution in a way that satisfies a bar investigator or malpractice carrier if challenged later.
Speed matters as much as thoroughness. A conflicts check that takes three weeks isn’t protecting the firm. It is creating a different kind of exposure, because new matters sit in a queue while the combined firm is already operating under a single name. Lateral candidates lose patience with firms where clearance is slow; the firms with the fastest clearance cycles win the talent competition even before the work starts. The firms that navigate combinations cleanly are the ones that can run high-volume clearance without sacrificing the quality of the review.
The administrative and risk infrastructure behind a merger gets far less attention than the deal terms or the client announcement. A disqualification motion filed six months after a combination closes is evidence that the integration was incomplete.
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