Shareholders of both companies approved the transaction on Febuary12.
The combined company retains the Weyerhaeuser name and continues to be traded under the WY ticker symbol on the New York Stock Exchange.
The combined company owns more than 13 million acres of diverse and productive timberlands and operates 38 wood products manufacturing facilities across the country.
"This is an exciting day for Weyerhaeuser as we bring together the best assets and talent in the industry," said Doyle R Simons, president and CEO.
"In the coming months, we will be relentlessly focused on creating value for our shareholders by capturing cost synergies, leveraging our scale, sharing best practices, delivering the most value from every acre and driving operational excellence. I look forward to being part of this outstanding team as we work together to be the world’s premier timber, land and forest products company," said Mr Simons.
Weyerhaeuser also announced the members of the combined company’s board of directors.
The 13-person board includes eight directors from the pre-closing Weyerhaeuser board and five directors from the pre-closing Plum Creek board.
