By Alexandra Scaggs and Angela Chen 

The Financial Industry Regulatory Authority fined Citigroup Inc. $15 million for failing to prevent its equity-research staff from committing communications breaches related to nonpublic information.

The settlement is the fourth research-related settlement since the beginning of 2012 for Citigroup. The bank neither admitted nor denied the charges, but consented to Finra's findings.

The fine is the biggest in more than a decade for Finra, the industry-funded regulator said.

According to Finra's release Monday, Citigroup from January 2005 to this past February issued about 100 internal warnings regarding communications by equity-research analysts. During this time, analysts hosted "idea dinners" attended by clients and sales and trading personnel where they discussed stock picks that were at times inconsistent with published research, said Finra.

Such idea dinners, which continue at Citigroup and other banks, aren't necessarily an issue, but regulators have grown concerned about discussions at the sessions in conflict with analysts' published research.

In Oct. 2013, Citigroup paid $30 million in a case brought by Secretary of the Commonwealth of Massachusetts William Galvin, one of the biggest fines for improper research practices in years, after investigators said an analyst leaked negative information about Apple Inc. and a supplier to four big investment firms before it was released to the public.

The previous year, the bank was fined for improperly disclosing confidential information about Facebook's initial public offering. It also faced a smaller Finra fine over failures to disclose investment-banking relationships, analysts' stock ownership and other information.

On Monday, Finra also said a senior Citi analyst in 2011 helped two companies prepare presentations for investment-banking roadshows, thus participating indirectly in efforts to promote initial public offerings to investors. From 2011 to 2013, Citigroup didn't explicitly prohibit equity analysts from assisting with these presentation materials.

Finra also cited the bank's issues from 2013, when a Citigroup analyst selectively gave certain clients information concerning Apple Inc., which was then selectively disseminated to additional clients by an equity-sales employee.

"Citi takes its regulatory compliance obligations seriously, and we believe that we have strong procedures and controls in place to address the issues that Finra has raised in this matter, and we are continually working to improve those procedures and controls going forward," a company representative said.

Despite the warnings it issued, Citigroup delayed disciplining research analysts, and the disciplinary measures taken weren't severe enough to deter repeat violations, according to Finra.

"Citigroup did not enforce the boundaries of permissible communications to ensure that its analysts did not provide certain clients with improper access to nonpublic research information," said Cameron Funkhouser, executive vice president of Finra's Office of Fraud Detection and Market Intelligence.

Matthias Rieker contributed to this article.

Write to Alexandra Scaggs at alexandra.scaggs@wsj.com and Angela Chen at angela.chen@dowjones.com

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