Volume increased over 500% to just over 1 million shares.
The size of the offering was increased to 60 million shares from the planned 50 million.
That figure may increase to 290,000 shares based on the stock's trading price before the deal closes, which is expected in about a month.
Three days later, the company increased the offering to 8 million shares, at $15.75 per share.
The deal is said to be oversubscribed, and Yell increased the size of its offering by 30 percent, to 400 million shares.
Outstanding short positions in its stock increased more than 29 percent, to 2.2 million shares.
A month later, with the price up to $33, the short position had increased to 1.1 million shares.
He said that he intended to increase his holdings to 100 million shares in the combined company.
On Sept. 17, he increased the order to 500,000 shares.
The stock was so in demand that the public offering was increased by 30 percent, to 400 million shares.
