Whiting Petroleum Corp. announced plans Monday to offer 35 million shares as well as $1.75 billion of convertible senior notes, raising concerns about the oil-and-gas producer’s ability to find a buyer for the whole company. Earlier this month, The Wall Street Journal had reported that Whiting was looking to sell itself amid plummeting crude prices. However, the stock sale announced Monday signaled any larger takeover was unlikely soon, an analyst said. “I think it pretty much puts that idea to bed,” said Jason Wangler, an analyst at Wunderlich Securities Inc. “It doesn’t mean there wasn’t interest, but it obviously means they didn’t get the price they wanted.” Shares of Whiting fell 12% to $33.75 in after-hours trading following news of the offerings. The stock—beaten down in late 2014 amid the drop in oil prices—had risen 47% through the close Monday from its low in December. Denver-based Whiting began suffering […]