Iraq’s massive West Qurna 2, which provides 10% of the nation’s crude, has shifted operations after U.S. sanctions forced Russia’s Lukoil out. Now, Chevron is eyeing the field, but the American oil giant insists on more favorable terms before it fully commits.

Massachusetts Financial Services Co. MA raised its stake in Chevron Corporation by more than 30% in the third quarter, acquiring over two million new shares. The total holdings now exceed nine million shares, representing a value of more than $1.4 billion.

After the removal of President Nicolás Maduro, the fate of the world’s largest oil reserves has drawn intense scrutiny. Chevron, the lone major U.S. company in Venezuela, has used lobbying and political connections to stay in the game, eyeing a bigger global footprint despite a deeply uncertain environment.

Penobscot Investment Management Company Inc. recently decreased its Chevron Corporation holdings by 5.3%. The firm sold 2,160 shares, leaving it with a total of 38,591 shares valued at $5,526,000.