File: Charles Lollar, a Republican candidate for Maryland governor. (Brian Witte/AP)

Maryland Republican gubernatorial hopeful Charles Lollar is continuing to run his campaign on a shoestring budget, according to a new report filed Tuesday that showed him with only about $18,000 in the bank as of last week.

Lollar, a Charles County businessman, reported having raised nearly $55,000 since early January and having spent more than $39,000 during the same period.

Lollar faces Harford County Executive David R. Craig, Del. Ronald A. George (Anne Arundel) and Anne Arundel County businessman Larry Hogan in the June 24 Republican primary.

Lollar’s campaign got a burst of momentum last month when he finished atop a straw poll conducted at a convention of the Maryland Republican Party, but he has struggled to raise the kind of money necessary to run television ads.

Gubernatorial contenders from both political parties are required to file campaign finance reports by midnight Tuesday. The two leading Democratic candidates — Lt. Gov. Anthony G. Brown and Attorney General Douglas F. Gansler — are both expected to report having several million dollars in the bank for the remaining weeks of the race.