The persistence phenomenon is studied in the Japanese financial market by using a novel mapping of the time evolution
of the values of shares in a portfolio onto Ising spins. The method is applied to historical end of day data from the
Japanese stock market over an arbitrarily chosen period. By studying the time dependence of the spins, we find clear
evidence for a power law decay of the proportion of shares that remain either above or below their "starting" values. The
results are compared with those resulting from data from the London market, where there is evidence of a distinctive
double power law. Preliminary results from the Japanese market indicate similar behavior. We estimate a long time
persistence exponent for the underlying financial markets to be 0.5.