Can anyone name one instance where the FTC or EU equilivalent stopped a merger

See https://www.thestreet.com/investing/stocks/5-government-bloc...

Check Point's acquisition of Sourcefire.

In the US, FTC does not have exclusive jurisdiction over merger review. It is shared with DoJ. HN commenters seem hyper-focused on FTC's failures while ignoring DoJ's sucesses. Are we allowed to consider the acquisitions and mergers DoJ has blocked.

Yes, consider ftc a placeholder for whatever agency does it.

DoJ blocked Penguin Random House proposed acquisition of Simon and Shuster. Also blocked Aon proposed merger with Willis Towers Watson.