Oil and Gas Legal Work in 2026: Few Repeat Clients, Big Tickets

A general counsel choosing among oil and gas law firms is buying into a small market. Sartori & Partners data show 411 distinct clients across 1,040 oil and gas deals in the 12 months to October 2026, or 2.5 deals for every client. The deals are also large: where a value was made public, the median was $750 million. Few clients, frequent mandates and big tickets change the balance between a company and its outside counsel, and this report sets out by how much against technology, power and the other resource sectors.

The client count is what sets the sector apart. Technology had 1,713 distinct clients on 3,279 deals, a rate of 1.9 deals per client. Power and renewables had 970 clients on 1,989 deals, or 2.1. Oil and gas, with 411 clients, ran at 2.5. The pattern is shared by the other capital-heavy sectors: utilities, water and waste ran at 2.5 and mining and metals at 2.3. A sector where the same issuers and acquirers come back is one where outside counsel depends on a short client list.

For a company this is leverage, and it is usually left unused. A firm that advises an oil and gas client on one deal expects the next two, so the relationship is worth more to the firm than any single fee. Ask for terms that reflect a program of work rather than one matter: agreed rates across the year, the same core team from deal to deal, and no charge for the time a new associate spends learning your assets.

In the Sartori & Partners deal records, oil and gas deals carried a public value 33.3% of the time, the highest share among the sectors compared here. Technology disclosed on 25.5%, power and renewables on 27.7%, mining and metals on 30.2%, and utilities, water and waste on 32.5%. The median disclosed value in oil and gas was $750 million, 3.0 times the technology median of $250 million. Power and renewables sat at $500 million and mining at $382.7 million. Only utilities came out higher, at $802.5 million.

Two cautions apply. A median covers only the deals whose value was published, and parties publish more often when a deal is large or when securities rules require it, so the figure describes the visible deals rather than every mandate. Even so, the gap with technology is wide. Large deals justify large teams, and that is where costs grow: ask each firm how many partners and associates it plans to put on your transaction, and tie the fee estimate to that staffing plan.

Capital markets deals were 40.2% of oil and gas deals, against 25.7% across the whole deal market. M&A was 28.8%, against 19.3%. Disputes and investigations moved the other way, at 10.7% of oil and gas deals against 25.0% of all deals. Technology has a different shape again: M&A at 30.0% leads capital markets at 23.3%. Each share is counted against all of a sector's deals, including deals with no recorded type, so the listed types are not the whole of the work and do not add to a total.

Staffing follows the same line. Capital markets lawyers worked on 41.5% of oil and gas deals, against 26.4% of all deals, and corporate and M&A lawyers on 32.3% against 23.3%. One deal can involve several practices, so these shares overlap. The practical reading is that a firm's oil and gas reputation is mostly an offerings and transactions reputation. A company facing an arbitration or a regulatory investigation should run a separate shortlist and not assume the deal team's firm has the same depth on the contentious side.

Latham & Watkins advised on the most oil and gas deals in the 12 months to October 2026, in the 151-250 band of deals advised. Vinson & Elkins followed in the 101-150 band and Kirkland & Ellis in the 61-100 band. From Gibson, Dunn & Crutcher and Baker Botts in the 41-60 band, counts thin out, and the firms ranked 6th to 10th all sit in the 21-40 band. The step down from the first three firms to the rest is steep, which is what a concentrated adviser market looks like. Vinson & Elkins, Gibson, Dunn & Crutcher, Baker Botts and Milbank make the oil and gas top 10 without appearing in the top 10 for the deal market as a whole.

Geography adds to the concentration. Lawyers in Houston worked on 48.2% of the sector's deals and lawyers in New York on 42.0%, which is where the work is done; one deal can count in several cities, so the shares overlap and add to more than the whole. With few advisers and few repeat clients, the counterparty on your next acquisition may well be a client of the firm you want. Run conflict checks before the deal is live, and keep a second firm briefed on your business so that a conflict does not cost you weeks.

Oil and gas deal flow held flat (+5.3%) over the settled 12-month windows, at 1,012 deals against 961 a year earlier. Deals across all sectors rose 10.6%, from 43,590 to 48,216. Technology held flat (+4.6%) as well, while power and renewables rose 27.6% and mining and metals rose 25.6%. A steady oil and gas count in a growing market means firms are not short of other work: the leverage of a repeat client comes from the relationship, not from scarcity of mandates.

The lawyers moved more than the deals did. Lateral moves by lawyers with an oil and gas focus rose 27.6%, to 199 from 156, and partners made up 56.2% of the moves in the 12 months to October. The partner who ran your last offering may sit at another firm by the next one. Name the lawyers who matter in the engagement terms and ask what happens to your matters if they leave.

First, negotiate as a repeat client. At 2.5 deals per client, against 1.9 in technology, your firm is planning on your next mandate as well as this one. Put that into the terms: a yearly rate agreement, a named core team, and a review after each deal. Second, use the deal size. With a median disclosed value of $750 million, staffing drives the bill more than hourly rates do, so agree the team shape before the work starts.

Third, split the shortlist by work type. For offerings and acquisitions, the firms in the 151-250 to 61-100 bands have done the most sector deals; for disputes, which were 10.7% of oil and gas deals against 25.0% across the market, look beyond the deal list. Fourth, plan around conflicts and moves. In a sector served by a short list of firms, clear conflicts early and keep a second relationship active, so neither a conflict nor a partner's departure leaves a live deal without counsel.