The state Government Accountability Board required candidates to file finance reports covering roughly the month leading up to a primary by Monday at 11:59 p.m. Walker doesn't face a GOP opponent, but Mary Burke and Brett Hulsey are vying for the Democratic nomination.
Walker filed reports Monday showing he raised $1.2 million from July 1 through July 28 and spent $1.6 million. He has raised $9.5 million so far this year and spent $7 million.
The governor also reported $76,250 in contributions collected after July 28.
Burke and Hulsey hadn't filed their preprimary reports by late Monday evening. Burke spokesman Joe Zepecki said campaign workers were still preparing her preprimary report. Hulsey said he didn't have his report ready yet, either.
Burke's latest report on file with the board shows she raised $3.6 million and spent $2.4 million over the first six months of the year. She had $2.5 million in the bank as of June 30 and had collected $21,000 since July 28.
Hulsey's latest report shows he raised $2,488 and spent $1,730 over the same period. He had $946 on hand at the end of June.
Meanwhile, in the race for state attorney general, Republican hopeful Brad Schimel's campaign said he had $418,000 in the bank as of July 28. He raised $53,970 and spent $36,000. He also reported $5,500 in contributions after July 28.
Schimel, the Waukesha County district attorney, is the only Republican in the race. Incumbent Republican Attorney General J.B. Van Hollen isn't running for a third term.
Three Democrats - Jefferson County District Attorney Susan Happ, Dane County District Attorney Ismael Ozanne and state Rep. Jon Richards of Milwaukee - are vying for that party's nomination. The primary winner will face Schimel in the general election Nov. 4.
Richards' report shows he had $167,000 on hand at the end of July, giving him the cash advantage over his two rivals. He raised $37,000 and spent $39,700. He has received one $500 contribution since July 28.
Happ reported raising $43,310 and spending $32,418 in July. She had $121,000 cash on hand as of July 28. Her campaign turned in a separate filing Monday showing she had received $2,500 in contributions and also gave herself a loan of $20,000 since July 28.
Ozanne collected $15,531 in donations and spent $11,192. He reported a cash balance of $7,700, as well as a $38,000 loan.