Three leading Am Law 100 firms celebrated the Memorial Day weekend with by grabbing key roles on a pair of billion-dollar transactions.

Cleary Gottlieb Steen & Hamilton’s Victor Lewkow and Aaron Meyers—the latter of whom made partner on Jan. 1—are heading up a team working with leading Swiss firm Homburger in advising Muttenz, Switzerland-based Clariant AG on its proposed $14 billion merger with Huntsman Corp. The stock-for-stock deal, announced on May 22 and expected to close by year’s end, will create a chemical industry giant, as noted by sibling publication Texas Lawyer.