At least seven merger and acquisition stalwart firms in Big Law guided Mars' $35.9 billion buy of snack maker Kellanova, announced Wednesday. Those on the deal, one of the largest of 2024, include Skadden, Arps, Slate, Meagher & Flom; Kirkland & Ellis; Simpson Thacher & Bartlett; Cravath, Swaine & Moore; Cleary Gottlieb Steen & Hamilton; Gibson, Dunn & Crutcher and Sullivan & Cromwell.