The "Keating 4", previously known as the Keating 5, is the collective nickname for Annalise's Law Students and main characters on How to Get Away with Murder. Currently, the group has disbanded officially as they no longer work for Annalise in a professional setting, but all of them remain in constant contact.
The Keating 5 work with Annalise Keating at her law office as interns in order to gain extra experience in order to make them better at whatever law career they choose when they graduate law school. Some students such as Bonnie Winterbottom have remained with Annalise even after she graduated from Middleton University and became her personal secretary/assistant. To help make the students more competitive and cause them to work harder, there is a trophy which the chosen student can use to get out of any exam and instantly pass it without actually taking it.
The first four students (Laurel Castillo, Asher Millstone, Michaela Pratt and Connor Walsh) were chosen because of their work on the trial case in class. The additional student (Wes Gibbins) was chosen was because of what had happened to the student's mother and Annalise felt it necessary to include him in her "Keating" group for her part that she played in the student mother's death.
As of "Who's Dead?" however, the Keating 5 has lost a member, as Wes Gibbins was murdered. As a result, the group has been renamed back to the Keating 4. Not long after, the group disbanded after they were essentially fired by Annalise as they weren't good people while they were together. To tell them the news, she invited them to a dinner where she handed each one of them letters which contained letters of recommendations. The remaining 4 then went on to get other internships at other law firms. Michaela got a job working for Caplan & Gold and Laurel got a job working for the D.A.'s office with Bonnie. Connor decided to drop out of law school after deciding that it wasn't the right fit for him. ("I'm Going Away", "I'm Not Her", "It's for the Greater Good")
Original "Keating 4" ("She Hates Us")
The only Keating 4 we know of in addition to the current ones are the Keating 4 of 2005. Annalise chose Bonnie, Kennedy, Xavier, and Noah from her Criminal Law class to work with her in her in her personal cases. Bonnie Winterbottom had therapy with the husband of Annalise, Sam to help her deal with her problems in childhood. Of the 4 bright students who helped her in cases, Annalize decided to stay with Bonnie as her right hand. In addition to this, Sam helped Frank Delfino by managing to convince Annalize that he will hire him as an assistant. When Frank was hired, he had a tendency to flirt with the other students and even sleep with them from time to time. It was later revealed that Bonnie was chosen to be part of the Keating 4 because of her complicated history with Annalise. Bonnie's becoming part of the "Keating 4" was one of the ways that Annalise tried to make up to what she did to her in court. It was also because of Annalise that Bonnie made it into law school in the first place. ("She Hates Us", "I Love Her")