Expess Scripts Inc. (ESRX) said it completed its $29.1 billion acquisition of Medco Health Solutions Inc. (MHS) following a Federal Trade Commission decision that the combination of the two largest pharmacy-benefits management companies in the U.S. wouldn't change the competitive landscape in the sector.

The FTC in a majority vote of 3-1 determined that the deal wouldn't change dynamics in the PBM market, ending an eight-month investigation. In a statement the panel said its probe found a "competitive market for PBM services characterized by numerous, vigorous competitors who are expanding and winning business from traditional market leaders."

The probe also showed that Express Scripts and Medco "are not particularly close competitors, the market today is not conducive to coordinated interaction, and there is little risk of the merged company exercising monopoly power," the FTC said.

In a dissenting opinion, FTC Commissioner Julie Brill called the merger "a game changer" and stated, "I have reason to believe that this merger is, in fact, a merger to duopoly with few efficiencies in a market with high entry barriers--something no court has ever approved."

Brill called on the commission to conduct a retrospective study on the merger in three years' time.

Express Scripts shares closed Friday at $54.18 and were halted premarket.

-By Tess Stynes, Dow Jones Newswires; 212-416-2481; Tess.Stynes@dowjones.com

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