HOUSTON, June 17 (Reuters) - A U.S. judge on Monday

dismissed a lawsuit Exxon Mobil ( XOM ) had filed against

activist group Arjuna Capital after the group had agreed not to

pursue future proxy filings at the company's annual meetings.

The largest U.S. oil company's lawsuit had raised alarm

among activists and public pension investors who argued it would

muzzle debate among shareholders and public companies.