UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

SCHEDULE 13D

Under the Securities Exchange Act of 1934

(Amendment No. 3)*

IEC Electronics Corp.

(Name of Issuer)

Common Stock, par value $0.01 per share

(Title of Class of Securities)

44949L105

(CUSIP Number)

Vintage Capital Management, LLC

4705 S. Apopka Vineland Road, Suite 210

Orlando, FL 32819

(407) 909-8015

With a copy to:

Bradley L. Finkelstein

Wilson Sonsini Goodrich & Rosati

Professional Corporation

650 Page Mill Road

Palo Alto, CA 94304

(650) 493-9300

(Name, Address and Telephone Number of Person Authorized to

Receive Notices and Communications)

October 27, 2014

(Date of Event which Requires Filing of this Statement)

If the filing person has previously filed a statement on Schedule 13G to report the acquisition which is the subject of this Schedule 13D, and is filing this schedule because of §§ 240.13d-1(e), 240.13d-1(f) or 240.13d-1(g), check the following box: ¨

Note. Schedules filed in paper format shall include a signed original and five copies of the schedule, including all exhibits. See § 240.13d-7 for other parties to whom copies are to be sent.

* The remainder of this cover page shall be filled out for a reporting person’s initial filing on this form with respect to the subject class of securities, and for any subsequent amendment containing information which would alter disclosures provided in a prior cover page.

The information required on the remainder of this cover page shall not be deemed to be “filed” for the purpose of Section 18 of the Securities Exchange Act of 1934 (“Act”) or otherwise subject to the liabilities of that section of the Act but shall be subject to all other provisions of the Act (however, see the Notes).

^* Percentage calculated based on 10,055,267 shares of common stock, par value $0.01 per share, outstanding as of August 1, 2014, as reported in the Form 10-Q for the quarterly period ended June 27, 2014 of IEC Electronics Corp.

^* Percentage calculated based on 10,055,267 shares of common stock, par value $0.01 per share, outstanding as of August 1, 2014, as reported in the Form 10-Q for the quarterly period ended June 27, 2014 of IEC Electronics Corp.

^* Percentage calculated based on 10,055,267 shares of common stock, par value $0.01 per share, outstanding as of August 1, 2014, as reported in the Form 10-Q for the quarterly period ended June 27, 2014 of IEC Electronics Corp.

Explanatory Note

This Amendment No. 3 (this “Amendment”) amends and supplements the Schedule 13D filed on February 13, 2014, as amended on May 28, 2014 and August 14, 2014 (the “Schedule 13D”), by the Reporting Persons relating to the Common Stock of the Issuer. Information reported in the Schedule 13D remains in effect except to the extent that it is amended, restated or superseded by information contained in this Amendment. Capitalized terms used but not defined in this Amendment have the respective meanings set forth in the Schedule 13D. All references in the Schedule 13D and this Amendment to the “Statement” shall be deemed to refer to the Schedule 13D as amended and supplemented by this Amendment.

Item 4. Purpose of Transaction.

Item 4 is amended to add the following:

On October 27, 2014, an affiliate of Vintage Capital submitted a letter to the Issuer (the “Nomination Letter”) nominating Keith M. Butler, Charles P. Hadeed, Lynn J. Hartrick, Andrew M. Laurence, Jeremy R. Nowak, Jeffrey T. Schlarbaum and Eric Singer (collectively, the “Nominees”) for election to the Board of Directors of the Issuer at the 2015 Annual Meeting of Stockholders. In the Nomination Letter, the affiliate of Vintage Capital reserved the right to further nominate, substitute or add additional persons in the event that (a) the Issuer purports to increase the number of directorships; (b) the Issuer makes or announces any changes to its bylaws or takes or announces any other action that purports to have, or if consummated would purport to have, the effect of disqualifying any of the Nominees; or (c) any of the Nominees is unable or becomes unwilling for any reason to serve as a director of the Issuer.

SIGNATURES

After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct.

Dated: October 27, 2014