The did that in preparation for the name and ticker change.
PR from Oct 8th
"the board approved the filing of a form-15, a name change of Santo Mining Corp. to Cathay Lifestyle Holding, Inc. Immediately after the corporate name change, the company will file with FINRA to change its trading symbol. The company will be also filling the 2014-K, 2015-K and the 1st 2016-Q"