Question Period -December 1, 2017 – Minister of Finance sales of Morneau Shepell shares.

The Minister of Finance said that his sale of $680,000 shares in Morneau Shepell in the days before he announced tax changes, a sale that saved him a cool half a million, had nothing to do with the tax changes, and everything to do with divesting himself prior to being sworn in as minister. The sale was really about divestment.
Can the minister explain why he held one million shares in Morneau Shepell until one month ago?