A super PAC backing Josh Kraft reported spending more than $1.4 million earlier this month on a suite of billboards, digital advertisements, and television, radio, and streaming hits, a massive sum that comes only months before Boston voters are set to decide the mayoral contest.

The spend by the “Your City, Your Future” super PAC is the first major outside injection of cash into Boston’s mayoral contest, where the marquee matchup is between Kraft and Mayor Michelle Wu.

In a disclosure filed Friday with state regulators, the super PAC reported spending $200,000 on digital advertisements, $668,750 on television, streaming, and radio hits, and $550,000 on billboards — all to oppose Wu.

The filing also showed that the super PAC spent more than $10,000 on text messages with Opinion Diagnostics, a political firm run by Brian Wynne, the former campaign manager and senior political advisor to Gov. Charlie Baker.

The super PAC has drawn millions in donations from major business executives, including $1 million alone from Fanatics CEO Michael Rubin, $100,000 from Kessler Group President Howard Kessler, and $1 million from New Balance Chairman Jim Davis, according to state data.

A spokesperson for “Your City, Your Future” did not immediately respond to a Herald inquiry Monday afternoon.

Super PACs and the candidates they back are barred from coordinating under state law.

Kraft, the son of billionaire New England Patriots owner Robert Kraft, pledged last week to give his campaign $2 million from his own personal wealth. He had just over $151,000 cash on hand at the end of April after raising $197,000 and spending $328,000 that month, state data showed.

Wu had a formidable $2.2 million in her campaign account after raising more than $376,000 and spending $168,000 in April, according to state data.

A spokesperson for Wu’s campaign did not immediately respond to a Herald inquiry Monday about the super PAC spending.