Bid & Ask: The Deals of the Week

Noteworthy expenditures of the week
Lumber: Rolfo Rolf Brenner/Getty Images; Thumb: Jeffrey Coolidge/Iconica/Getty Images; Icahn: Scott Eells/Bloomberg; Imagebroker/Alamy

1. Chicago Bridge & Iron offered $3 billion for nuclear energy contractor Shaw Group in the largest construction acquisition of the year, making a big bet on a nuclear renaissance.

2. Canadian home-improvement retailer RONA spurned a $1.8 billion takeover offer from Lowe’s. RONA’s stock had a record one-day gain, a sign that investors anticipate a bidding war for the company.