List of largest mergers and acquisitions

"Megamerger" redirects here. For distributed algorithm in computing, see Mega-Merger.

The following tables list the largest mergers and acquisitions by decade of transaction. Transaction values are given in the US dollar value for the year of the merger, adjusted for inflation. As of February 2026, the largest ever acquisition was the 2026 takeover of xAI by SpaceX at $250 billion ($250 billion adjusted for inflation). AT&T appears in these lists the most times with six entries, for a combined transaction value of $334.4 billion. Mergers and acquisitions are notated with the year the transaction was initiated, not necessarily completed. Mergers are shown as the market value of the combined entities.

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