This article documents and seeks to explain the relationships between
an organization's size and a person's probability of experiencing inte
rorganizational mobility (i.e., quits and layoffs). Our analyses are b
ased on data from a broadly representative panel study of Norwegian or
ganizations and their employees. We find that employees of larger esta
blishments in the private sector are less likely to be laid off and to
quit their jobs. We then test possible explanations of these relation
ships between organization size and mobility. We find that larger orga
nizations in the private sector have lower quit rates mainly because t
hey are more likely to be unionized. The relationship between size and
layoffs, on the other hand, remained significant even after we contro
lled for our explanatory variables. There was no relationship between
size and quits in the public sector.