This information is extremely incomplete and is taken only from the first few minutes of the pilot episode. I will be updating it when I can.
Gracen & Gracen, Inc.: Gracen & Gracen "is spearheaded by its agressive acquisitions policy and has a capital base of 14.8 billion dollars, making it the 15th largest corporation in the word." It has 38,000 employees worldwide.
Charles Henry Gracen: "Chaz" to his friends. Charles Gracen is the older son of Gracen & Gracen's founder and was promoted to CEO four years ago.
Jack Walters: President of Acquisitions at the start of the series. Jack had an affair with Joanne Meltzer when his wife left him; he and his wife are now back together, however.
Mary Miller: A Senior Vice President of Acquisitions.
Pete Gracen: The other Senior Vice President of Acquisitions, and Chaz's younger brother.
Wayne Gresham: A former Vice President of Acquisitions. "He was overworked, overweight, and, now, just plain over" after dying of a heart attack. Jim Profit is his replacement.
Jim Profit: The newest Vice President of Acquisitions. He used to work in the auditing department, and is a graduate of Wharton. Jim wants to be President of Acquisitions.
Joanne Meltzer: The head of West Coast security for Gracen & Gracen. According to her Keltner Personality Test, she is "fanatical in pursuit of a goal." Jim comments that "her obsessive personality is undoubtedly the result of a severe childhood trauma, but it serves her well as an investigator." In her spare time, she enjoys helicopter skiing (whatever that is) and Tai Chi, and she's a vegetarian.
Gail Koner: Jack Walter's executive secretary at the start of the series. According to closed captioning, but not mentioned in Jim's actual voice-over, she is "a loyal employee of three years and very devoted to her boss." Her mother has multiple sclerosis and Gail embezzeled small amounts of money from G&G in order to give her a better hospital room. Gail's lucky numbers were three, seven and nine until Jim Profit uncovered her scheme and blackmailed her.