A number of posts have discussed a phenomenon called shadow lobbying, nonlobbying lobbying, or unlobbying. Open Secrets provides some data:
As of early 2014, 45 percent of lobbyists who were active in 2012 but not 2013 were still working for the same employer for whom they lobbied in 2012. In 2013, we performed asimilar analysis of lobbyists who deactivated in 2012 and found that about 46 percent were still with the same employer. The deactivated lobbyists who stayed were again the largest category in 2014. About a third of deactivated lobbyists moved to a different organization, with 14 percent staying in a similar industry and 19 percent going to a different industry. A small handful exited the job market altogether, either through retirement or death. We were unable to find information on 14 percent of the lobbyists who deactivated during 2013.