UNITED STATES

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) May 22, 2015

Technical Communications Corporation

(Exact name of registrant as specified in its charter)

Registrant’s telephone number, including area code (978) 287-5100

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:

Effective May 22, 2015, McGladrey LLP (“McGladrey”) was dismissed as the independent certified public accounting firm of Technical Communications Corporation (the “Company”). The audit committee of the Company’s Board of Directors participated in and approved the decision to change independent registered public accounting firms.

The reports of McGladrey on the Company’s financial statements for each of the past two fiscal years did not contain an adverse opinion or a disclaimer of opinion, and were not qualified or modified as to uncertainty, audit scope, or accounting principles.

In connection with the audits of the Company’s financial statements for each of its two most recent fiscal years and through May 22, 2015, there have been no disagreements between the Company and McGladrey on any matter of accounting principles or practices, financial statement disclosure, or auditing scope and procedures which disagreement, if not resolved to the satisfaction of McGladrey, would have caused it to make reference to the subject matter of such disagreement in connection with its reports on the financial statements for such periods.

During the Company’s two most recent fiscal years and through May 22, 2015, there have been no reportable events (as defined in Item 304(a)(1)(v) of Regulation S-K) with McGladrey.

The Company provided McGladrey with a copy of the disclosures it is making in this Report on Form 8-K and requested that McGladrey furnish it with a letter addressed to the Commission stating whether or not it agrees with the above statements. A copy of such letter from McGladrey is attached as Exhibit 16.1 to this Form 8-K.

Effective May 22, 2015, the Company retained Moody, Famiglietti & Andronico, LLP (“MFA”) to act as the Company’s new independent registered public accounting firm. In accordance with Item 304(a)(2) of Regulation S-K, the Company did not consult MFA regarding either (i) the application of accounting principles to a specified transaction, either completed or proposed, or the type of audit opinion that might be rendered on the Company’s financial statements; or (ii) any matter that was either the subject of a disagreement or a reportable event (each as defined in Item 304(a)(1) of Regulation S-K).

SIGNATURE

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.