Where Making Partner Takes Longest: Immigration, Family and ESG

Law firm leaders who ask about the practice areas where making partner takes longest get a consistent answer from the promotion record. Sartori & Partners data show that 54.3% of business immigration partners promoted over the last 5 years made partner within 12 years of their first year of practice, against 75.4% across the whole market. The family law specialities, ESG and climate change sit at the same level, and wealth and family office work only a little above it. The slow tracks have one of two things in common: the work advises individuals and families rather than deal teams, or the field is new enough that few firms have a settled path to partnership in it.

Each speciality figure covers the partners promoted in that speciality over 5 years and is measured on the cases where the first year of practice is known: 81 in business immigration, against 10,427 for the market. A speciality is the lawyer's own focus today, counted apart from the practice group, so specialities are set against their practice by share and direction only. The first year of practice follows each country's own route to qualification, so these figures pool every country and read as a broad measure, not a city-by-city clock. Promotion figures stop at May 2026: the 12 months of promotions run from June 2025 to May 2026.

The gap is not the work of a few late promotions. The quickest quarter of business immigration partners had 10.0 years of practice behind them, against 9.0 years in the market; the median was 12.0 years against 10.0 years, and the slowest quarter reached 15.0 years against 12.0 years. Only 12.3% were promoted within 8 years, against 23.2% market-wide. The share promoted within 12 years trails the market by 21.1 points, and the wider immigration practice reads the same way, at 54.5%.

Set against fast deal work the distance grows: 86.7% of private equity partners were promoted within 12 years. Business immigration still produces partners, 21 of them between June 2025 and May 2026, but they come later in a career. For a firm building an immigration bench, the consequence is timing: a senior associate in this field usually stands further from partnership than a corporate associate of the same year, and a lateral hire is the quicker way to add a partner this cycle.

The market benchmark is not standing still either: 77.1% of the partners promoted in 2022 got there within 12 years, against 74.3% of those promoted in 2025. The specialities in this report sit well below every year of that line.

Family work is where the promotion record runs longest. Marital agreements has the longest median of the specialities in this report, 14.0 years, and only 44.0% of its partners were promoted within 12 years; it rests on 25 cases, so read it as a rough size rather than a ranking. Divorce and financial remedies promoted 51.3% of its partners within 12 years, and children and custody 52.6%. The family practice as a whole stands at 52.1%, so its specialities move with the practice rather than against it.

The spread inside family law is wide. In the Sartori & Partners promotion record, the quickest quarter of divorce partners reached partnership after 9.5 years, close to the market's 9.0 years, but the slowest quarter needed 16.0 years. In marital agreements even the quickest quarter needed 11.0 years. Children and custody lawyers promoted to partner between June 2025 and May 2026 numbered 21: these benches add a few partners a year. A firm that wants a family partner in the next round will rarely find one ready in its own associate ranks; the realistic routes are a lateral hire, or a counsel title that keeps a strong senior associate while the partnership case matures.

Sustainability is the clearest case of a newer field running slower than the practice it belongs to. Only 54.3% of ESG and sustainability partners were promoted within 12 years, and 55.8% of climate change partners, against 70.6% across the environment and sustainability practice. The practice median is 10.0 years, in line with the market, while both specialities sit at 12.0 years.

The long tail confirms it. The slowest quarter of climate change partners needed 15.0 years of practice, against 13.0 years in the practice and 12.0 years in the market, and even the quickest quarter of ESG partners took 10.0 years. For a firm, the practical reading is that a sustainability partner is quicker to hire, or to find among existing partners who have moved into the field, than to grow from a junior associate on the market clock.

Wealth and family office is the least slow of the group. Its median partner had 11.0 years of practice and 56.4% were promoted within 12 years, against 66.2% in private client and estates and 75.4% in the market. The direction matches the sustainability specialities: slower than the market, and slower than its own practice.

The lateral market for these lawyers moved sharply. Wealth and family office moves rose 116.7%, to 65 in the latest settled 12 months from 30 a year earlier. Partners made up 61.0% of the moves over the last 12 months, so firms are adding wealth partners by hiring them. A firm entering the field should expect to compete for partners on price and platform, not to promote its way in.

Where homegrown partners arrive late, firms hire them. Partners made up 65.4% of climate change lateral moves over the last 12 months and 61.0% in wealth and family office, against 27.7% across the whole lateral market. The family specialities sit above the market as well: 45.7% in marital agreements and 38.9% in divorce and financial remedies.

Business immigration is the exception. Partners were 23.1% of its lateral moves and associates 52.3%, while counsel took 24.6%, against 12.7% market-wide. The immigration practice promoted 1.00 partners for each lateral partner it hired in the 12 months to May 2026, against 0.79 for the market: it grows its own partners, slowly, and hires at counsel level more often than the market does.

Set the partnership timeline by speciality, not by firm average. An associate in business immigration, divorce, children and custody, ESG or climate change work is measured against a median of 12.0 years, not the market's 10.0 years; a promise made on the market clock will be missed, and a missed promise is the usual reason a senior associate takes a call from another firm. Budget for lateral partners where the clock is longest: in climate change and wealth work the lateral market is already mostly partners, so plan the cost of a partner hire into any growth case for those teams. Use the counsel title on purpose in immigration and family teams, where the distance between a strong senior associate and partnership can run for years. And when a rival offers partnership sooner in one of these fields, read it as a lateral pitch, not a market norm. Sartori & Partners data, drawn from public law-firm announcements, firm websites and professional profiles, checked monthly, will show whether the newer fields shorten their clocks as more associates come through them.