Japan's foreign reserves narrowed by $377 billion in July from the previous month, according to data from the Ministry of Finance on Friday.
Official reserve assets as of the end of July fell to a 16-month low of $1.287 trillion from $1.287 trillion at the end of June.
Of the total, foreign securities assets reached $927.3 billion, down from $928.6 bllion the previous month, while deposits rose to $162.3 billion from $161.9 billion.
Japan's IMF reserve position climbed to $11.4 billion from $11.3 billion, while its holdings of special drawing rights edged up to $60.7 billion from $60.4 billion.