Massachusetts is poised to shine a light on super PACs.

Four years after the Supreme Court’s Citizens United ruling paved the way for independent expenditure committees to raise and spend unlimited funding, a new state bill would require committees, unions and corporations to reveal their donors.

“This is a great bill for adding more transparency to our elections,” said Pam Wilmot, executive director of Common Cause Massachusetts. “So many donors to political ads are now secret. This has been a top priority for us.”

Common Cause helped draft the original version of the disclosure bill four years ago.

After the House and Senate each passed similar versions of the disclosure bill, a legislative conference committee produced a new compromise bill Tuesday night. The full House and Senate approved the final bill, which included yes votes from all members of the Greater Fall River legislative delegation, and sent it to Gov. Deval Patrick, who signed the bill Friday.

“The disclosure aspects of this bill are really terrific,” Wilmot said. “It puts us as a leader in the nation for shining light on dark money in elections.”

Super PACs can raise and spend unlimited amounts of money to aid political campaigns but aren’t allowed to coordinate with individual candidates. Under the new legislation, Massachusetts will require them to disclose the source of their funding within one week of making an expenditure. Once they get within 10 days of an election, they will be required to make the disclosure daily.

Additionally, super PACs will be required to list their top five donors at the end of each advertisement. The bill also requires them to file a complete list of donors with the state Office of Campaign and Political Finance.

“Cloaked spending continues to unfairly influence elections nationwide, and it is destroying the civility of the political process,” Senate President Therese Murray, D-Plymouth, said in a statement. “It’s time that we restore transparency to our elections process and allow voters in Massachusetts to know who is contributing and where money is going in a timely manner.”

Super PACs have begun showing their influence in Massachusetts. One such committee, Mass Forward, supports Treasurer Steven Grossman and recently aired a political ad criticizing Attorney General Martha Coakley’s stance on firearms sales. Grossman and Coakley, both gubernatorial candidates, are running against each other in the Democratic primary.

In addition to bringing greater transparency to political spending, the legislation also raises the maximum contribution an individual can make to a candidate from $500 to $1,000.

The legislation also includes a provision requiring the state secretary of administration and finance to write a statement about the economic impact of any ballot question, then include the statement in booklets to be distributed to voters.

Barbara Anderson, director of Citizens for Limited Taxation, blasted that provision, saying it’s unrelated to the issue of super PAC disclosure. She said the provision will allow governors to unfairly influence voters ahead of votes on ballot questions.

“They’re out to make sure a governor who doesn’t want a tax cut can say anything he wants,” she said. “The only intent is to make sure the petition doesn’t pass. The legislators who vote on it are voting to kill the petition process.”