Whatever it is, this isn't normal behavior in large company culture, especially looking at the situation.

0 Nokia shares
7th largest Microsoft shareholder

Which could raise reasonable questions about conflict of interest. Just week ago i would have laughed at discussion like this, but imo there's some real reasons already by law for these things to be told.

Elop does not need to tell openly about his Microsoft shares, but he does need to tell how much Nokia shares he is packing. Nokia's investor page tells he owns none.