Partner Book of Business by Practice Area

In our interviews with 500+ partners based in the United Kingdom and continental Europe, GBP-denominated books cluster in the GBP 1.5–2.5 million median range for most practices. Corporate/M&A partners in GBP reported a GBP 2.5 million median; Magic Circle partners in GBP, GBP 3 million. EUR-denominated medians tend to fall between EUR 1.5 million and EUR 2.5 million for the major practice categories. The pattern of practice-driven dispersion holds across currencies: PE/private capital and capital markets practices show wider ranges and higher upper tails than litigation or regulatory.

EUR Tax (n=5): EUR 0.75m–2.5m, median ~EUR 1.75m. Magic Circle GBP (n=13): GBP 1.6m–20m, median ~GBP 3m. Magic Circle EUR (n=14): EUR 0.75m–15.5m, median ~EUR 3.5m.

The observed ranges are wide by design, not by measurement error. In our interviews with 2,600+ partners, the same practice label can mean very different things. A Disputes partner at a US national firm with a regional client base reports a book in the USD 0.5–1.5 million range. A disputes partner at a Magic Circle firm managing multi-jurisdictional regulatory investigations for financial institutions reports a book in the USD 10–37 million range. Both are Disputes/Litigation.

What drives the wide range within each practice?

Three factors explain most of the within-practice dispersion observed across our interview corpus. First, deal-ticket concentration. Second, billing model. Third, portability classification — each set out in full above.

What do portability objections sound like in practice?

Across 2,600+ partner conversations, the sixth most common objection archetype — appearing in 198 conversations — was explicit client portability uncertainty. Partners in this category describe client concentration risk (large institutional clients follow the firm, not the lawyer), panel-driven work with fixed approved-vendor lists, and in some cases explicit portability expectations from target firms described as “absolutely impossible” for their practice type. A Disputes partner whose work flows from a single multinational client under a panel arrangement sits in a structurally different position to a Restructuring partner whose debtor-side mandates follow them personally. The book figure alone does not capture that distinction; the portability classification does.

What should a law firm know before setting a book-of-business threshold?

In our interviews, the tension between firm expectations and partner reality is most acute when firms set a single numeric threshold across practices — for example, a minimum USD 3 million portable book for any equity partner lateral. Our data shows why that is too blunt. A USD 3 million Disputes partner with 80% low-portability institutional work is a structurally weaker lateral than a USD 2 million Corporate/M&A partner with a highly portable, relationship-driven client base. Firms that build their threshold around the headline figure without interrogating currency, portability classification, and rate compatibility will over-shortlist in some practices and under-hire in others. Our methodology note and research methodology pages explain how we approach book assessment in a mandate context.

What should a lateral partner understand about their own book before a conversation?

A partner considering a lateral move should run a clear-eyed self-assessment before any conversation reaches the book-of-business stage. Our corpus of 2,600+ conversations suggests the partners who stall at offer stage most often are those who overestimate portable fraction, underestimate rate-gap risk, or conflate headline book with underwriting value. The practical pre-conversation checklist: identify the five largest clients by revenue; assess whether each client relationship is personal, team-dependent, or institutional; stress-test each against a 15–25% rate uplift; and be honest about concentration risk. A USD 4 million book with 60% in one client that the firm does not lose in 90% of lateral moves is a very different proposition to a USD 2 million book spread across twelve clients who follow the partner individually. To discuss where your book sits in this picture, talk to the Sartori research desk or submit your profile.