SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, D.C. 20549

FORM 8-K

CURRENT REPORT

Pursuant to Section 13 or 15(d) of

the Securities Exchange Act of 1934

Date of Report (Date of earliest event reported): February 19, 2013

IBERIABANK CORPORATION

(Exact name of Registrant as Specified in Charter)

200 West Congress Street, Lafayette, Louisiana 70501

(Address of Principal Executive Offices)

(337) 521-4003

Registrant’s telephone number, including area code

NOT APPLICABLE

(Former name or former address, if changed since last report)

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:

On February 19, 2013, the Compensation Committee increased the annual base salaries of the named executive officers as follows: Daryl G. Byrd, President and Chief Executive Officer — $900,000; Anthony J. Restel, Senior Executive Vice President and Chief Financial Officer — $440,000; Michael J. Brown, Vice Chairman and Chief Operating Officer — $570,000; John R. Davis, Senior Executive Vice President — Mergers and Acquisitions/Finance Investor Relations — $440,000; and Jefferson G. Parker, Vice Chairman and Managing Director of Brokerage, Trust and Wealth Management — $460,000. The salary increases are effective on March 4, 2013.

The Compensation Committee awarded discretionary bonuses to the named executive officers as follows: Mr. Byrd — $758,000 (including a $150,000 contribution into Mr. Byrd’s Non-Qualified Deferred Compensation Plan account); Mr. Restel — $245,000; Mr. Brown — $290,000; Mr. Davis — $235,000; and Mr. Parker — $245,000.

The Compensation Committee granted restricted stock awards to the named executive officers as follows:

The shares of restricted stock vest over five years in equal increments on the anniversary of the date of grant.

The Compensation Committee also granted phantom stock awards to the named executive officers as follows:

The phantom shares vest over five years in 25% increments commencing on the second anniversary of the date of grant.

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The value of the shares on the date of each of the awards was $52.36 per share.

The Compensation Committee granted stock options to the named executive officers as follows:

The stock options vest over five years in equal increments on the anniversary of the date of the grants.

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SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the Registrant has duly caused this report to be signed on its behalf by the undersigned, hereunto duly authorized.