March 25 (Reuters) -

Activist investor Elliott Investment Management on Tuesday

sued Phillips 66 to protect shareholders rights and

force the oil refiner to comply with its own charter.

The complaint, filed in the Delaware Chancery Court,

seeks to have four directors stand for election at the company's

annual meeting this year.

The lawsuit comes less than four weeks after Elliott,

which owns a $2.5 billion stake in Phillips 66, nominated seven

directors to the company's board.

The board currently has 14 members but will shrink to 12

after the company's annual meeting in May.