Based on the HUGE volume (on PEM and PMMEF), and the fact that that share price has settled back down (to a much smaller gain that at the start of trading), I would surmise that many shareholders sold shares when the got their "double" today. I was also tempted by this morning's price and, as so many have said, you can't go broke taking a profit.
But, as both Boot and Primed24, have suggested it may be too early to "pull the trigger." The share price of PEM can move much higher before it's time to take some profit. And it may be an especially "unprofitable" idea to reduce one shares before the Chrome Mountain spin-off.
In the end, the price of PEM will many layers higher than $1.00 and the profit from the spin-off will just be the "icing" on those layers.
- panamax