Collins is one of 20 candidates competing against Loeffler, a financial executive who has pledged to spend at least $20 million to keep her seat.
They will share the same November special election ballot, and a runoff between the two top contenders is necessary if none get a majority of the vote.
The top Democratic contenders include Matt Lieberman, the son of the former vice presidential candidate; former U.S. Attorney Ed Tarver and the Rev. Raphael Warnock, who pastors Atlanta’s Ebenezer Baptist Church.
The financial reports for federal candidates due Wednesday span a three-month period between Jan. 1 and the end of March, a stretch that coincided with a worsening coronavirus pandemic that drained bank accounts and sapped interest in political contests.