The story follows Michelle Darnell, a titan of industry who is sent to prison for insider trading, denounced by her former lover, Renault, who still holds a heavy grudge towards her for their breakup, after getting a promotion a few years ago. After doing her time, Michelle emerges, ready to rebrand herself as America's latest sweetheart, but not everyone she steamrolled is so quick to forgive and forget. With nowhere to go and no one to scam, Michelle is forced to move in with former assistant Claire and her young daughter, Rachel. Now at her lowest point, Michelle wastes no time in devising a winner-take-all plan to rebuild her empire.
Melissa McCarthy as Michelle Darnell, a powerful business woman, who was abandoned by several different families for an unknown reason, which caused her to have a bitter personality against the idea of having a family. She gets arrested by the FBI for insider trading and is on parole in the film.
Kristen Bell as Claire Rawlings, Michelle's personal assistant and single mom, who at first stops working for her, after Michelle's arrest. She creates an empire along with Michelle, by selling homemade brownies Claire bakes.
Peter Dinklage as Ronald Renault, a business man and rival to Michelle. He holds a long time grudge towards Michelle due to the fact that they dated in the past, but broke up due to a promotion Michelle got, which instantly changed her behavior and caused them to break up. He was also responsible for turning Michelle over to the authorities for insider trading. He constantly names himself Renault and follows the lifestyle of a samurai.
Ella Anderson as Rachel Rawlings, Claire's 10-year-old daughter, who was part of a girl scout team called the Dandelions, but quits, after being oppressed by one of the girl scouts and her mother and being convinced to join alongside Michelle.
Tyler Labine as Mike Beals, a co-worker of Claire's, who seems to try to woo Claire, who constantly rejects him softly.
Kathy Bates as Ida Marquette, a former mentor of Michelle's who is the owner of a glue factory. She cut off their alliance, after Michelle decided to push Ida away from a deal she made from another company.
Annie Mumolo as Helen Kreagan, an evil, arrogant woman and mother to one of the girl scouts, who constantly chastises Rachel. She thinks she's better than everyone else, including Michelle, even when Michelle has had more success.
Kristen Schaal as Sandy Haim, the leader of the Dandelions, who is constantly treated as an inferior by Helen.
Cecily Strong as Dana Dandridge, Claire's selfish, sarcastic and overbearing boss, who describes Michelle as one of her "two personal heroes", with the second being Benedict Cumberbatch.
Cedric Yarbrough as Tito, Michelle's former bodyguard, who constantly cheers along with Michelle.
Set in Chicago, the movie began filming in Chicago on March 12, 2015. In addition to filming in Chicago, the movie was also filmed throughout various locations in the Atlanta, Georgia area, including Agnes Scott College, Crescent Avenue in Midtown, Glenwood Park, and the Buckhead Loop area.
The Boss grossed $63.3 million in the United States and Canada, plus $15.5 million in other territories, for a worldwide total of $78.8 million against a budget of $29 million.
In the United States and Canada, pre-release tracking suggested the film would gross $20–24 million from 3,480 theaters in its opening weekend, besting fellow newcomers Hardcore Henry ($7–10 million projection) and Demolition ($2–3 million projection). The film grossed $985,000 from its early Thursday screenings and $8.1 million on its first day. It went on to gross $23.6 million in its opening weekend, finishing first at the box office.
The Boss received generally negative reviews from critics. Review aggregator website Rotten Tomatoes gives the film an approval rating of 22%, based on 169 reviews, with an average of 4.5/10. The site's critical consensus reads, "Melissa McCarthy remains as fiercely talented as ever, but her efforts aren't enough to prop up the baggy mess of inconsistent gags and tissue-thin writing that brings down The Boss." On Metacritic, the film has a score of 40 out of 100, based on 39 critics, indicating "mixed or average reviews". Audiences polled by CinemaScore gave the film an average grade of "C+" on an A+ to F scale.