Aug. 30, 2012

Science Applications International Corp. announces that it will split into two companies, Leidos and a new SAIC.

Nov. 5, 2012

John P. Jumper and Anthony J. Moraco appointed chief executives of Leidos and SAIC, respectively.

Sept. 27, 2013

Split completed; new SAIC listed on New York Stock Exchange .

Oct. 4, 2013

SAIC executives ring closing bell at NYSE.

December 2013

Both companies issue first earnings report since the split.

Leidos’s revenue and profits fall compared with the same period the previous year.

At SAIC, revenue falls, but profit dips less dramatically.

February 2014

Jumper announces he will retire once a new chief executive is found.

March 27, 2014

K. Stuart Shea, who was favored to lead Leidos, announces surprise resignation. Profits and revenue fall at both companies compared to the previous year.

June 2014

Revenue and profits at Leidos fall again, but profit falls by a smaller percentage than the previous quarter. SAIC sees revenue drop, but profits rise.

July 1, 2014

Former Boeing executive Roger Krone appointed chief executive of Leidos.

September 2014

Leidos reports big drop in health and engineering services segment. SAIC’s revenue drops, but profits increase.

Editor’s note: An earlier version of this had an incorrect date for the appointment of John P. Jumper and Anthony J. Moraco as chief executives of Leidos and SAIC.