This research was aimed to test the influence of managerial ownership to accounting conservatism and
the effect to cost of debt. This research used companies’ data which the companies listed on Indonesian
Stock Exchange and had debt rate published by Pefindo. Ordinary Least Square was used to do analysis
to data. Result showed that managerial ownership variable related to the increasing asymmetric
timeliness. It was meant that the bigger managerial ownership, the more conservative. And than, no
significant influence of accounting conservatism to cost of debt. The statement that the more conservative
of financial statement, the bigger company’s rating (low cost of debt), was not proved. Next result showed
that no significant of influence of managerial ownership to cost of debt. The final finding showed that
there was influence of managerial ownership to rating (proxy of cost of debt), after moderated with
accounting conservatism. By interacting accounting conservatism with managerial ownership, the
unsignificant influence of managerial ownership became significant influence. This research was
expected ti give contribution to investors and to interest parties on their decision making and to
regulators on their judgment of regulation making.