U.S. 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 7, 2013

AMERICAN SCIENCE AND ENGINEERING, INC.

(Exact Name Of Registrant As Specified In Its Charter)

MASSACHUSETTS

(State or Other Jurisdiction of Incorporation)

(978) 262-8700

(Registrant’s Telephone Number, Including Area Code)

N/A

(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:

o Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)

o Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)

o Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))

o Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

Item 2.02. RESULTS OF OPERATIONS AND FINANCIAL CONDITION.

On May 7, 2013, American Science and Engineering, Inc. issued a press release announcing financial results for the fourth quarter and fiscal year ended March 31, 2013.  A copy of the Press Release issued on May 7, 2013 regarding those results is submitted herewith as Exhibit 99.1.

Limitation on Incorporation by Reference.  The information furnished in this Form 8-K and the Exhibit attached hereto shall not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended, or otherwise subject to the liabilities of that section, nor shall such information be deemed incorporated by reference in any filing under the Securities Act of 1933, as amended, except as shall be expressly set forth by specific reference in such a filing.

Cautionary Note Regarding Forward-Looking Statements.  Except for historical information contained in the Press Release attached as an Exhibit hereto, the Press Release contains forward-looking statements which involve certain risks and uncertainties that could cause actual results to differ materially from those expressed or implied by these statements. Please refer to the cautionary note in the Press Release regarding these forward-looking statements.

Item 8.01 OTHER EVENTS

On May 7, 2013, the Company announced that its Board of Directors has authorized another $35 million stock repurchase program.  Under the new program, the Company is authorized to repurchase the Company’s common stock from time to time on the open market or in privately negotiated transactions.  The timing and amount of any shares repurchased will be determined based on an evaluation of market conditions and other factors.  The Company will implement a Rule 10b5-1 trading plan to make such purchases, which will permit shares to be repurchased when the Company might otherwise be precluded from doing so under insider trading laws.  The repurchase program may be suspended or discontinued at any time.  Any repurchased shares will be funded with cash on hand.  This new program will not commence until after the completion of the Company’s current blackout period and existing stock repurchase program, which the Company announced on August 2, 2012.

Item 9.01. FINANCIAL STATEMENTS AND EXHIBITS.

(d)  Exhibits

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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 thereunto duly authorized.

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EXHIBIT INDEX

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