Impac Mortgage Holdings late last week came to market with a “follow-on” offering of 3 million shares of common stock, the first public equity sale by a pure-play mortgage company in almost three years. Unfortunately, investors were not happy. When the shares hit the New York Stock Exchange last Friday, not only did Impac’s stock price tumble almost 9.0 percent, but it has continued to drift downward, resting at just over $13.00 a share as Inside Mortgage Finance went to press this week. The share price of the nation’s 28th largest originator hit...