Oil and Gas M&A Counsel in 2026: More Sector Lawyers Change Firms

A general counsel comparing oil and gas M&A law firms should start with a fact about people rather than deals: the lawyers who work on the sector are changing firms more often. Sartori & Partners data show 199 lateral moves by lawyers whose focus is oil and gas in the settled 12 months to September 2026, against 156 a year earlier, so their moves rose 27.6%. These are lawyers of any practice whose own focus is the sector, not only M&A specialists. Over the same windows the sector's deal count held flat (+5.3%), from 961 to 1,012. Corporate and M&A lawyers worked on 32.3% of oil and gas deals in the 12 months to October 2026. For a company, the pairing matters: the team that pitches for the next mandate is less fixed than the steady volume of work suggests.

Set side by side, the two trends part ways. Moves by oil and gas lawyers rose 27.6% on settled windows (199 against 156). The sector's deals held flat (+5.3%) on the same windows (1,012 against 961), while all deals on record rose 10.6% (48,216 against 43,590). Power and renewables, the neighboring energy sector, did not see the same movement among its lawyers: their moves held flat (-5.5%) (291 against 308). Deal counts are matters on record, court and trademark filings included, not revenue. In the 12 months to October 2026, 176 oil and gas lawyers changed firms, and 77 firms hired at least one of them. The practical reading for a company: ties to individual partners in this sector are looser than the deal flow implies. Ask every firm on a shortlist which lawyers named in its pitch joined in the last year, and which have already worked on your matters.

The movers are senior. Partners made up 56.2% of oil and gas lawyers who changed firms in the 12 months to October 2026, counsel 16.5% and associates 26.7%. Across all corporate and M&A moves the mix runs the other way, with partners at 29.9% and associates at 57.7%. Power and renewables lawyers sit between the two, with partners at 43.9% of their moves. The tilt is not a one-year effect: over 3 years partners were 56.6% of the sector's movers. Partner moves on their own held flat (+22.6%) (114 against 93), a gap inside the noise for counts this small. Some movers also stepped up a title: 16.5%, against 12.4% across corporate and M&A. For a company, the likelier disruption is a partner leaving, not a junior team turning over. Ask how many partners on your matters have the sector focus, and who takes the file if one of them goes.

Where these lawyers land is narrow. Houston firms took 27.3% of the oil and gas lawyers who changed firms in the 12 months to October 2026, an index of 1,162, where par is the city's share of all lateral moves. London follows at 13.1%, an index of 142. For corporate and M&A lawyers of every sector, Houston's index is only 136, so the city's pull comes from the sector, not from the practice. Few of the sector's movers relocate: 16.3% also changed city, against 21.2% of corporate and M&A movers. For a company, that means a departing oil and gas partner usually stays within reach, and the choice is often between following the lawyer across town and staying with the firm's remaining team.

The sector's work leans on M&A lawyers more than the market does. Sartori & Partners records put corporate and M&A lawyers on 32.3% of oil and gas deals, against 23.3% of all dated deals. By type, M&A was 28.8% of the sector's deals, against 19.3% across the market. Capital markets lawyers worked on 41.5% of the sector's deals; one deal can carry both practices, so the shares overlap and are never added. Seen from the practice side, the sector is a small book: oil and gas was 3.0% of corporate and M&A deals, or 336 deals, against 4.9% for power and renewables. The practice's own deal count rose 9.5% (11,170 against 10,198), a separate reading from the sector's count. Among oil and gas lawyers who moved, 31.2% were recorded under corporate and M&A, an index of 151. For a company, an oil and gas acquisition is a thin slice of most corporate practices' work: test whether the partners pitching have closed the sector's deals, not only M&A in general.

The clearer partner signal comes from the wider M&A market, not from the sector. Lateral partner hires in corporate and M&A rose 12.2% on settled windows (873 against 778), while partner moves among oil and gas lawyers held flat (+22.6%). Sartori & Partners data also show larger tickets in the sector. Where a value was disclosed, on 33.3% of oil and gas deals, the median was $750 million, against $315 million for corporate and M&A deals with a disclosed value (17.7% of them). The sector median covers every oil and gas deal, capital markets and disputes included, not only its M&A work, so read it as the scale of the sector's matters rather than a price for an acquisition. For a company, larger matters and an active market for corporate partners point the same way: a mandate that rests on one partner carries a real risk of a change mid-deal, and the engagement letter should name a second partner.

Two firm lists answer different questions. The list below ranks firms by all oil and gas deals in the 12 months to October 2026, every practice included; the corporate and M&A deal list ranks firms by all M&A work, every sector included. Four names sit on both: Latham & Watkins, Kirkland & Ellis, Gibson, Dunn & Crutcher and White & Case. The first of them advised on 151-250 oil and gas deals, against 401-700 corporate and M&A deals. Vinson & Elkins sits second on the sector list. A separate list counts the firms that hired the most oil and gas lawyers over 3 years; Baker Botts heads it, and three of its names also sit on the sector deal list: Baker Botts, Gibson, Dunn & Crutcher and White & Case. For a company, firms on both deal lists combine sector volume with general M&A volume. Firms that appear only on the sector list carry heavy oil and gas work across practices: ask how much of it is M&A.

Buy the team, not the logo. With moves by the sector's lawyers up 27.6% on settled windows and partners at 56.2% of the movers, the partner you hire is the asset most likely to change firms. Four steps follow. First, ask each firm for the start date of every partner named in its pitch, and for the oil and gas deals each has closed there. Second, weigh Houston benches: the city takes 27.3% of the sector's movers, so that is where a lost partner will reappear and where a replacement will come from. Third, budget for scale: the sector's median disclosed deal value, $750 million, sits well above the corporate and M&A median. Fourth, put two partners on the engagement. Sartori & Partners figures come from public law-firm announcements, firm websites and professional profiles, checked monthly.