UPDATE 1-Devon Energy will lay off 9 percent of staff to boost returns

(Adds details of layoffs, stock movement)

HOUSTON, April 10 (Reuters) - Devon Energy Corp said on Tuesday it would lay off 300 workers, roughly 9 percent of staff, part of a plan to streamline operations and boost the shale oil producer's sagging returns and stock price.

The cuts will affect all areas of the company's operations, not just its Oklahoma City headquarters. Staff will be let go "in the weeks ahead," Devon said in a statement.

Devon, like many of its shale peers, has come under pressure from Wall Street in recent months to focus less on production and more on ways to boost shareholder returns. The company's stock had, as of Tuesday's close, lost more than 20 percent of its value in the past year despite a jump in oil prices.

Devon said it expects the cuts to help save $150 million to $200 million annually by 2020. "The oil and gas industry is in a lower-for-longer commodity price environment, which requires Devon to transform the way it operates," Devon spokesman John Porretto said in a statement.

Devon also laid off staff in 2016 as the oil industry grappled with oil prices nearly half of current levels.

Chief Executive Dave Hager said last month that Devon had to shed assets of more than $5 billion to become a "lean, efficient company that drives high returns."

Devon, which operates in several large U.S. shale fields, also said last month that it would buy back $1 billion of its stock and raise its quarterly dividend by 33 percent after posting lower-than-expected quarterly earnings.

Shares of Devon jumped 6.5 percent on Tuesday afternoon to $33.50 a share on the New York Stock Exchange, in line with broader markets and oil prices. (Reporting by Ernest Scheyder)