The Day After the Deal: What McCormick vs. Unilever Teaches Us About PMI at Scale
When McCormick announced on March 31, 2026 that it would acquire Unilever’s food business for approximately $44.8 billion, the headlines focused on the numbers — $15.7 billion in cash, Hellmann’s and Marmite and Knorr folded into a spice and condiment giant. Shares of both companies fell on the day: McCormick by 6%, Unilever by 4%. But behind the stock market reaction lies a more fundamental question for integration practitioners: how do you absorb a century-old portfolio of European consumer brands into a Maryland-headquartered flavor company without breaking what made them valuable? The PMI Challenge at Scale Haspeslagh and Jemison (1991), in their foundational study of post-merger integration, observed that the primary failure mode in large acquisitions was not financial incompatibility — it was what they termed “capability transfer failure”: the inability to move the organizational routines, relationships, and tacit knowledge that underpin competitive advantage across the com...