Get node ID from a list of coordinates

Hello,

I have a variable containing nodes coordinates, example:    $Stock contains {{3.73 4.17 0}} {{3.92 3.16 0}} {{4.89 3.26 0}} so the coordinates of 3 nodes.

I am searching for a command that could get me the IDs of these nodes with using the $Stock variable that I have.

In other terms, from the coordinates, get back the nodes IDs foreach node.

Thanks in advance for any ideas you guys may have,

Nicolas