Great question, and honestly the answers vary wildly depending on who you ask.
Finance teams typically track revenue synergies, cost savings achieved versus projected, ROIC, and whether the deal was accretive to earnings within the expected timeframe.
But the deals I’ve seen labeled “successful” years later often came down to softer factors: Did the key talent stay? Did customers stick around? Did the combined entity actually launch the products or enter the markets that justified the premium?
One pattern worth noting: companies that define success metrics before closing tend to fare better than those who figure it out afterward. The act of agreeing on what winning looks like forces alignment between integration teams, leadership, and the board.
What’s your context? Are you evaluating a past deal or building a framework for future ones?