Glenhill Advisors Dumps Lionbridge Technologies Inc (LIOX)

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

SCHEDULE 13G/A

Under
the Securities Exchange Act of 1934

(Amendment No. 13)*

Lionbridge Technologies, Inc.

(Name of Issuer)

Common
Stock

(Title of Class of Securities)

536252109

(CUSIP Number)

January 5, 2017

(Date of Event Which Requires Filing of this Statement)

Check the appropriate box to
designate the rule pursuant to which this Schedule is filed:

☐ Rule 13d-1(b)

☒ Rule 13d-1(c)

☐
Rule 13d-1(d)

The information required in 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).

Lionbridge Technologies, Inc.

1050 Winter Street

Waltham, MA 02451

Glenhill Advisors, LLC, Glenn J. Krevlin, Glenhill Capital
Advisors, LLC, Glenhill Capital Management, LLC and Glenhill Capital Overseas Master Fund, LP.

Glenn J. Krevlin is the managing member
and control person of Glenhill Advisors, LLC, and is the sole shareholder of Krevlin Management, Inc. Krevlin Management, Inc. is the managing member of Glenhill Capital Advisors, LLC, which is the investment manager of Glenhill Capital Overseas
Master Fund, LP and Glenhill Concentrated Long Master Fund, LLC (each of which was a security holder of the Issuer), and the investment manager of Glenhill Long Fund, LP which is currently (along with Mr. Krevlin) a security holder of the Issuer.
Glenhill Advisors, LLC is the managing member of Glenhill Capital Management, LLC. Glenhill Capital Management, LLC is the managing member of Glenhill Concentrated Long Master Fund, LLC and Glenhill Long GP, LLC, and is sole shareholder of Glenhill
Capital Overseas GP, Ltd. Glenhill Capital Overseas GP, Ltd. is the general partner of Glenhill Capital Overseas Master Fund, LP. Glenhill Long GP, LLC is the general partner of Glenhill Long Fund LP.

Glenhill Capital Advisors, LLC is also the investment manager for certain third party accounts for which shares of the Issuer were held and
managed by one or more of the Reporting Persons for the benefit of such third parties. Such Reporting Persons had dispositive power and shared certain voting power with respect to such shares, and received management fees and performance-related
fees in connection therewith. As of the date of this filing, there are no shares of Common Stock of the Issuer held in such third party managed accounts.

600 Fifth Avenue, 11th
Floor

New York, NY 10020

See the response(s) to Item 4 on the attached cover page(s).

Common Stock

536252109

Not Applicable

Provide the following information regarding the aggregate number and percentage of the
class of securities of the issuer identified in Item 1:

See the response(s) to Item 5 on the attached cover
page(s).

See the response(s) to Item 6 on the attached
cover page(s).

See the response(s) to Item 7 on the
attached cover page(s).

See the response(s) to Item 8 on the
attached cover page(s).

If this statement is being filed to
report the fact that as of the date hereof the reporting person has ceased to be the beneficial owner of more than 5 percent of the class of securities, check the following  ☒.

Not Applicable.

Not Applicable.

Not Applicable.

Not Applicable.

By signing below I certify that, to the best of my knowledge and
belief, the securities referred to above were not acquired and are not held for the purpose of or with the effect of changing or influencing the control of the issuer of the securities and were not acquired and are not held in connection with or as
a participant in any transaction having that purpose or effect.

SIGNATURE

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.

DATE:       January 13, 2017