Clients Asking Law Firms to Return Historical Matter Data — AI as the Driver of Data Portability Pressure

The American Lawyer published a dedicated piece (August 3) documenting a new procurement dynamic: some corporate clients are requesting that law firms compile and return their historical matter data. The driving force is AI: clients want to train their own internal AI tools or feed their in-house legal AI systems with matter history that currently sits in outside counsel's document management systems rather than in the client's own infrastructure. For BD directors, this dynamic reframes data custody as a relationship management issue: how the firm responds to a data return request communicates its posture on client ownership of client-generated information. Firms that can return clean, structured matter data efficiently signal alignment with client interests; firms that delay or provide incomplete, poorly organized data signal misalignment. The request pattern is still emerging, but BD teams should treat it as a leading indicator of which clients are investing seriously in in-house AI programs.