Criterion is sponsoring the annual National Schools Lacrosse Tournament that started on February 27.
More than 2,800 girls playing for 180 teams and representing 69 schools from around the country will play in the event.
The insurance and risk management company's three-year sponsorship deal is worth £120,000.
This will be topped up from the government's Sportsmatch programme by £30,000. The tournament finals will be Saturday March 17.