Ant-Man became the 12th (out of 12) Marvel film to open at number one at the US box office. It opened with $57.2M domestic and $55.4M internationally. Though, it did open #1, it had the second lowest domestic opening for a MCU film. It just beat out The Incredible Hulk, which earned $55.4M back in 2008.
But let's make something clear. This is not a failure for Marvel. The opening is just a few million less than what was expected it would be. It will probably reach $150M domestic, if not more. And you can never forget about the foreign box office. Think of it more like a Captain America: The First Avenger than a Guardians of the Galaxy. Marvel has always been more about the overall picture than that of a single performance. Ant-Man introduces a new hero into the MCU and it does that successfully. That is all that Marvel can really ask for.
As for the rest of the box office, Minions falls to second with $50.2M domestically and lands #2 internationally with $66.1M. Trainwreck, the Amy Schumer vehicle, did better than expected with $30.2M domestic to take third. You have to give a lot of credit to the popularity that Schumer has right now. She can't seem to do much wrong.
Inside Out meanwhile crossed $300M domestic with a fourth place finish of $11.62M. And Jurassic World rounded out the top 5 with adding another $11.4M. These two films are bigger surprise hits than anyone could have seen coming.
Source: Box Office Mojo