The FTC has successfully blocked the Kroger/Albertsons mega-merger - a deal that would have meant higher prices for shoppers and even more dominance in the retail food industry. It's a massive win, one that could trigger deconcentration in the industry.
https://storage.courtlistener.com/recap/gov.uscourts.ord.178374/gov.uscourts.ord.178374.521.0_1.pdf