UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

SCHEDULE 13D

Under the Securities Exchange Act of 1934

(Amendment No. 5)*

Learning Tree International, Inc.

(Name of Issuer)

Common Stock, $0.0001 par value

(Title of Class of Securities)

522015106

(CUSIP Number)

Mill Road Capital II, L.P.

Attn: Thomas E. Lynch

382 Greenwich Avenue

Suite One

Greenwich, CT 06830

203-987-3500

With a copy to:

Peter M. Rosenblum, Esq.

Foley Hoag LLP

155 Seaport Blvd.

Boston, MA 02210

617-832-1151

(Name, Address and Telephone Number of Person Authorized to Receive Notices and Communications)

March 19, 2013

(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 that 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 sent.

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).

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Introduction.

This Amendment No. 5 to the joint statement on Schedule 13D with respect to the common stock, $0.0001 par value (the “Common Stock”), of Learning Tree International, Inc., a Delaware corporation (the “Issuer”), filed by Mill Road Capital, L.P., a Delaware limited partnership (the “Mill Road Fund”), Mill Road Capital GP LLC, a Delaware limited liability company (the “Mill Road Fund GP”), Thomas E. Lynch and Scott P. Scharfman (collectively, the “First Reporting Persons”) on October 29, 2012, as amended by the Amendment No. 1 on Schedule 13D filed by the First Reporting Persons on November 13, 2012, as amended and restated by the Amendment No. 2 on Schedule 13D filed by the First Reporting Persons, Lane Five Partners LP, a Delaware limited partnership (the “Lane Five Fund”), Lane Five Partners GP LLC, a Delaware limited liability company (the “Lane Five Fund GP”), Lane Five Capital Management LP, a Delaware limited partnership (the “Lane Five Advisor”), Lane Five Capital Management, LLC, a Maryland limited liability company (the “Lane Five Advisor GP”), Lisa O’Dell Rapuano and Pleiades Investment Partners—LA, L.P., a Delaware limited partnership (the “Pleiades Fund” and, together with the other persons identified as having filed such Amendment No. 2, the “Second Reporting Persons”) on November 19, 2012, as amended by the Amendment No. 3 on Schedule 13D filed by the Second Reporting Persons on February 5, 2013, and as amended by the Amendment No. 4 on Schedule 13D filed by the Second Reporting Persons on March 12, 2013 (such filing, as so amended and as amended and restated herein, the “Schedule 13D”), amends and restates the Schedule 13D in its entirety, as further set forth below, for purposes of, among other things, (i) disclosing that each of the Mill Road Fund and the Mill Road Fund GP ceased to be the beneficial owner of any shares of Common Stock as of March 19, 2013 (the “Transfer Date”), and (ii) satisfying the initial reporting requirement under Section 13(d) of the United States Securities Exchange Act of 1934, as amended (the “Exchange Act”), of Mill Road Capital II, L.P., a Delaware limited partnership (the “Mill Road Fund II”), and Mill Road Capital II GP LLC, a Delaware limited liability company (the “Mill Road Fund II GP”), each of which became a beneficial owner of more than 5% of the Common Stock on the Transfer Date.

This Schedule 13D refers to (i) the Mill Road Fund II, the Mill Road Fund II GP, the Mill Road Fund and the Mill Road Fund GP, collectively, as the “Mill Road Fund Entities,” (ii) the Mill Road Fund II, the Mill Road Fund II GP and Messrs. Lynch and Scharfman, collectively, as the “Mill Road Reporting Persons,” (iii) the Lane Five Fund, the Lane Five Fund GP, the Lane Five Advisor, the Lane Five Advisor GP and Ms. Rapuano, collectively, as the “Lane Five Reporting Persons,” (iv) the Lane Five Reporting Persons and the Pleiades Fund, collectively, as the “Supporting Reporting Persons,” (v) the Mill Road Reporting Persons and the Supporting Reporting Persons, collectively, as the “Reporting Persons,” and (vi) the Reporting Persons, the Mill Road Fund and the Mill Road Fund GP as the “Extended Reporting Persons.”

This joint statement on Schedule 13D relates to the Common Stock. The address of the Issuer’s principal executive offices is 1831 Michael Faraday Drive, Reston, Virginia 20190.

This Schedule 13D is being filed by the Extended Reporting Persons, who entered into a Joint Filing Agreement dated March 21, 2013, a copy of which is filed as Exhibit 1 to this Schedule 13D, pursuant to which they have agreed to file this Schedule 13D jointly in accordance with Rule 13d-1(k) promulgated under the Exchange Act. Information disclosed in this Schedule 13D with respect to any Extended Reporting Person is given solely by such Extended Reporting Person, and no Extended Reporting Person assumes responsibility for the accuracy or completeness of the information disclosed in this Schedule 13D with respect to any other person except to the extent provided by Rule 13d-1(k) promulgated under the Exchange Act.

The disclosures required by Item 2 of Schedule 13D under the Exchange Act for the Extended Reporting Persons are set forth below.

Mill Road Reporting Persons and the other Mill Road Fund Entities.

(a) The names of Mill Road Reporting Persons and the other Mill Road Fund Entities are Mill Road Capital II, L.P., Mill Road Capital II GP, LLC, Thomas E. Lynch, Scott P. Scharfman, Mill Road Capital, L.P. and Mill Road Capital GP LLC. The Mill Road Fund II GP is the sole general partner of the Mill Road Fund II. The Mill Road Fund GP is the sole general partner of the Mill Road Fund. Messrs. Lynch and Scharfman, Charles M. B. Goldman and Justin C. Jacobs are the management committee directors of the Mill Road Fund II GP and the Mill Road Fund GP and, in this capacity, are referred to in this Schedule 13D as the “Mill Road Managers.”

(b) The business address of each of the Mill Road Managers, and the address of the principal business and the principal office of each of the Mill Road Fund Entities, is 382 Greenwich Avenue, Suite One, Greenwich, CT 06830.

(c) The principal business of the Mill Road Fund II GP is acting as the sole general partner of the Mill Road Fund II, and the principal business of the Mill Road Fund GP is acting as the sole general partner of the Mill Road Fund. The principal business of each of the Mill Road Fund II and the Mill Road Fund is investing in securities. The present principal occupation or employment of each Mill Road Manager is as a management committee director of the Mill Road Fund II GP, the Mill Road Fund GP and Mill Road Capital Management LLC, a Delaware limited liability company, which provides advisory and administrative services to the Mill Road Fund Entities and is located at 382 Greenwich Avenue, Suite One, Greenwich, CT 06830.

(d) None of the Mill Road Fund Entities and the Mill Road Managers has, during the last five years, been convicted in a criminal proceeding (excluding traffic violations or similar misdemeanors).

(e) None of the Mill Road Fund Entities and the Mill Road Managers was, during the last five years, a party to a civil proceeding of a judicial or administrative body of competent jurisdiction and, as a result of such proceeding, was or is subject to a judgment, decree or final order (1) enjoining future violations of, or prohibiting or mandating activities subject to, federal or state securities laws, or (2) finding any violation with respect to such laws.

(f) Each of the Mill Road Fund Entities is organized under the laws of the state of Delaware. Each Mill Road Manager is a citizen of the United States.

Lane Five Reporting Persons.

(a) The names of the Lane Five Reporting Persons are Lane Five Partners LP, Lane Five Partners GP LLC, Lane Five Capital Management LP, Lane Five Capital Management, LLC and Lisa O’Dell Rapuano. The Lane Five Fund GP is the sole general partner of the Lane Five Fund. The Lane Five Advisor provides investment advisory services to the Lane Five Fund and to the Pleiades Fund. The Lane Five Advisor GP is the sole general partner of the Lane Five Advisor. Ms. Rapuano is a managing member of each of the Lane Five Fund GP and the Lane Five Advisor GP.

(b) The business address of Ms. Rapuano, and the address of the principal business and the principal office of each of the Lane Five Fund, the Lane Five Fund GP, the Lane Five Advisor and the Lane Five Advisor GP, is 1122 Kenilworth Drive, Suite 313, Towson, MD 21204.

(c) The principal business of the Lane Five Fund is investing and trading in a wide variety of securities and financial instruments. The principal business of the Lane Five Fund GP is acting as the sole general partner of the Lane Five Fund. The principal business of the Lane Five Advisor is serving as an investment manager, including for the Lane Five Fund and the Pleiades Fund. The principal business of the Lane Five Advisor GP is acting as the sole general partner of the Lane Five Advisor. The present principal occupation or employment of Ms. Rapuano is serving as a managing member of each of the Lane Five Advisor GP and the Lane Five Fund GP, which have the respective principal businesses described above in this paragraph and the respective addresses of their respective principal businesses and of their respective principal offices described in paragraph (b) above.

(d) None of the Lane Five Reporting Persons has, during the last five years, been convicted in a criminal proceeding (excluding traffic violations or similar misdemeanors).

(e) None of the Lane Five Reporting Persons was, during the last five years, a party to a civil proceeding of a judicial or administrative body of competent jurisdiction and, as a result of such proceeding, was or is subject to a judgment, decree or final order (1) enjoining future violations of, or prohibiting or mandating activities subject to, federal or state securities laws, or (2) finding any violation with respect to such laws.

(f) Each of the Lane Five Fund, the Lane Five Fund GP and the Lane Five Advisor is organized under the laws of the state of Delaware, and the Lane Five Advisor GP is organized under the laws of the state of Maryland. Ms. Rapuano is a citizen of the United States.

Pleiades Entities.

(a) The name of the Pleiades Fund is Pleiades Investment Partners—LA, L.P. Veritable Partnership Holding, Inc., a Delaware corporation (“VPHI”), is the sole general partner of the Pleiades Fund. Veritable, LP, a Delaware limited partnership (“Veritable”), is the sole stockholder of VPHI. The Pleiades Fund, VPHI and Veritable are referred to in this Schedule 13D collectively as the “Pleiades Entities,” and each of them is referred to in this Schedule 13D as a “Pleiades Entity.”

(b) The address of the principal business and the principal office of each of the Pleiades Entities is 6022 West Chester Pike, Newtown Square, PA 19073.

(c) The principal business of the Pleiades Fund is acting as a pooled investment vehicle. The principal business of VPHI is acting as a general partner of pooled investment vehicles. The principal business of Veritable is acting as a U.S. Securities and Exchange Commission Registered Investment Adviser.

(d) No Pleiades Entity has, during the last five years, been convicted in a criminal proceeding (excluding traffic violations or similar misdemeanors).

(e) No Pleiades Entity was, during the last five years, a party to a civil proceeding of a judicial or administrative body of competent jurisdiction and, as a result of such proceeding, was or is subject to a judgment, decree or final order (1) enjoining future violations of, or prohibiting or mandating activities subject to, federal or state securities laws, or (2) finding any violation with respect to such laws.

(f) Each of the Pleiades Entities is organized under the laws of the state of Delaware.

Set forth on Annex I attached hereto is the information required to be disclosed pursuant to Item 2 of Schedule 13D under the Exchange Act for certain other persons related to VPHI and Veritable.

The disclosures required by Item 3 of Schedule 13D under the Exchange Act for the Reporting Persons are set forth below.

Mill Road Reporting Persons.

On the Transfer Date, the Mill Road Fund II acquired beneficial ownership of an aggregate of 831,771 shares of Common Stock for $2,911,198.50 from the Mill Road Fund using working capital from the Mill Road Fund II.

Lane Five Reporting Persons.

The Lane Five Fund acquired beneficial ownership of an aggregate of 326,236 shares of Common Stock for $3,507,345 using working capital from the Lane Five Fund.

The Pleiades Entities.

The Pleiades Fund acquired beneficial ownership of an aggregate of 157,542 shares of Common Stock for $1,756,933 using working capital from the Pleiades Fund.

Voting Agreement and the Novation Agreement.

On November 9, 2012, the Mill Road Fund, the Lane Five Fund, the Lane Five Advisor and the Pleiades Fund entered into the Voting Agreement (the “Voting Agreement”), which is attached hereto as Exhibit 5 and described in Item 6 of this Schedule 13D. On March 18, 2013, the Mill Road Fund II, the Mill Road Fund, the Lane Five Fund, the Lane Five Advisor, and the Pleiades Fund entered into a Novation Agreement (the “Novation Agreement”), which is attached hereto as Exhibit 6 and described in Item 6 of this Schedule 13D, for purposes of effecting the novation of the Voting Agreement, effective as of the Transfer Date, to substitute the Mill Road Fund II in place of the Mill Road Fund for all purposes of the Voting Agreement. As described in Item 5 of this Schedule 13D, as a result of the Voting Agreement and the Novation Agreement, (i) the Mill Road Reporting Persons may be deemed to have acquired beneficial ownership of the aggregate of 483,778 shares of Common Stock directly held by the Lane Five Fund and the Pleiades Fund, (ii) the Lane Five Reporting Persons may be deemed to have acquired beneficial ownership of the 831,771 shares of Common Stock directly held by the Mill Road Fund II and, in the case of the Lane Five Fund and the Lane Five Fund GP, the 157,542 shares of Common Stock directly held by the Pleiades Fund, and (iii) the Pleiades Fund, may be deemed to have acquired beneficial ownership of the aggregate of 1,158,007 shares of Common Stock directly held by the Mill Road Fund II and the Lane Five Fund. No Reporting Person paid any cash consideration in connection with the execution and delivery of the Voting Agreement or the Novation Agreement, and thus no funds were used for such purpose.

The Reporting Persons acquired shares of the Common Stock based on their belief that the Common Stock represents an attractive investment opportunity. The Reporting Persons further believe that the Issuer would be better able to realize its full value as a private entity. It is the Reporting Persons’ intent to acquire the Company. Accordingly, in a letter dated September 21, 2012, attached hereto as Exhibit 8, the Mill Road Fund submitted an offer to acquire all outstanding shares of the Issuer that it does not own.

On November 9, 2012, the Mill Road Fund entered into the Voting Agreement with the Lane Five Fund, the Lane Five Advisor and the Pleiades Fund, pursuant to which the Lane Five Fund, the Lane Five Advisor and the Pleiades Fund agreed to take certain actions, and to refrain from taking certain other actions, to support the Mill Road Fund’s intended acquisition of the Issuer, as more fully described in Item 6 below. The Voting Agreement is attached hereto as Exhibit 5 and incorporated by reference into this Item 4.

On February 4, 2013, the Mill Road Fund sent the letter attached hereto as Exhibit 9 to a special committee of the Issuer’s board of directors, reiterating its offer from September 2012 to acquire all outstanding shares of the Issuer that it does not own at price equal to $5.80 per share.

On March 8, 2013, the Mill Road Fund and the Lane Five Advisor sent the letter attached hereto as Exhibit 10 to the nominating and corporate governance committee of the Issuer’s board of directors. The letter proposes Ms. Rapuano and Stephen Quattrociocchi for the committee’s consideration as nominees for election to the Issuer’s board of directors at the 2013 annual meeting of the Issuer’s stockholders.

On the Transfer Date, the Mill Road Fund transferred all of the shares of Common Stock held by it to the Mill Road Fund II. In connection with such transfer, on March 18, 2013, the Mill Road Fund II, the Mill Road Fund, the Lane Five Fund, the Lane Five Advisor and the Pleiades Fund entered the Novation Agreement for purposes of effecting the novation of the Voting Agreement, effective as of the Transfer Date, to substitute the Mill Road Fund II in place of the Mill Road Fund for all purposes of the Voting Agreement. The Novation Agreement is attached hereto as Exhibit 6 and incorporated by reference into this Item 4.

The Reporting Persons intend to review continuously their equity interest in the Issuer. Depending upon their evaluation of the factors described below and subject to the Voting Agreement, as modified by the Novation Agreement, one or more of the Reporting Persons may from time to time purchase additional securities of the Issuer, dispose of all or a portion of the securities then held by such Reporting Persons, or cease buying or selling such securities; any such additional purchases or sales of securities of the Issuer may be in the open market, in privately negotiated transactions or otherwise.

The Reporting Persons may wish to engage in a constructive dialogue with officers, directors and other representatives of the Issuer, as well as the Issuer’s shareholders; topics of discussion may include, but are not limited to, the Issuer’s markets, operations, competitors, prospects, strategy, personnel, directors, ownership and capitalization. The Reporting Persons may also enter into confidentiality or similar agreements with the Issuer and, subject to such an agreement or otherwise, exchange information with the Issuer. The factors that the Reporting Persons may consider in evaluating their equity interest in the Issuer’s business include the following: (i) the Issuer’s business and prospects; (ii) the performance of the Common Stock and the availability of the Common Stock for purchase at particular price levels; (iii) the availability and nature of opportunities to dispose of the Reporting Persons’ interests; (iv) general economic conditions; (v) stock market conditions; (vi) other business and investment opportunities available to the Reporting Persons; and (vii) other plans and requirements of the Reporting Persons.

Depending on their assessment of the foregoing factors, the Reporting Persons may, from time to time, modify their present intention as stated in this Item 4.

Except as set forth above, the Reporting Persons intend to continuously review their options but do not have at this time any specific plans that would result in (a) the acquisition by any person of additional securities of the Issuer or the disposition of securities of the Issuer; (b) any extraordinary corporate transactions such as a merger, reorganization or liquidation involving the Issuer or any of its subsidiaries; (c) any sale or transfer of a material amount of the assets of the Issuer or of any of its subsidiaries; (d) any change in the present management or Board of Directors of the Issuer, including any plans or proposals to change the number or term of directors or to fill any existing vacancies on the Issuer’s Board of Directors; (e) any material change in the present capitalization or dividend policy of the Issuer; (f) any other material change in the Issuer’s business or corporate structure; (g) any change in the Issuer’s charter or by-laws or instruments corresponding thereto or other actions that may impede the acquisition of control of the Issuer by any person; (h) the Common Stock being delisted from a national securities exchange or ceasing to be authorized to be quoted in an inter-dealer quotation system

of a registered national securities association; (i) causing a class of equity securities of the Issuer to become eligible for termination of registration pursuant to Section 12(g)(4) of the Exchange Act; or (j) any action similar to any of those enumerated above.

The percentages of beneficial ownership reported for the Reporting Persons in this Item 5, and on each Reporting Person’s cover page to this Schedule 13D, are based on a total of 13,217,484 shares of Common Stock issued and outstanding as of January 31, 2013, as reported in the most recent quarterly report of the Issuer on Form 10-Q for the fiscal quarter ended December 28, 2012. All of the share numbers reported below, and on each Reporting Person’s cover page to this Schedule 13D, are as of March 21, 2013, unless otherwise indicated.

The disclosures required by paragraphs (a) and (b) of Item 5 of Schedule 13D under the Exchange Act for the Extended Reporting Persons are set forth below.

Mill Road Reporting Persons and the other Mill Road Fund Entities.

(a, b) The cover page to this Schedule 13D for each of the Mill Road Reporting Persons, the Mill Road Fund and the Mill Road Fund GP is incorporated by reference in its entirety into these paragraphs (a, b) of this Item 5.

The Mill Road Fund II directly holds, and thus has sole voting and dispositive power over, 831,771 shares of Common Stock. The Mill Road Fund II GP, as sole general partner of the Mill Road Fund II, also has sole authority to vote (or direct the vote of), and to dispose (or direct the disposal) of, these shares of Common Stock, and each of Messrs. Lynch and Scharfman has shared authority to vote (or direct the vote of), and to dispose (or direct the disposal) of, these shares of Common Stock on behalf of the Mill Road Fund II and the Mill Road Fund II GP. None of the Mill Road Fund, the Mill Road Fund GP or Messrs. Goldman or Jacobs has beneficial ownership of any shares of Common Stock.

As a result of the Voting Agreement and the Novation Agreement, each of the Mill Road Reporting Persons may be deemed to have the shared power to vote (or direct the vote of), or to dispose (or direct the disposal) of, the 326,236 shares of Common Stock directly held by the Lane Five Fund and the 157,542 shares of Common Stock directly held by the Pleiades Fund. Except to the extent that any Mill Road Reporting Person may be so deemed to have beneficial ownership of these 483,778 shares of Common Stock, neither the filing of this Schedule 13D nor any of its contents shall be deemed to constitute an admission by any Mill Road Reporting Person that such Mill Road Reporting Person is the beneficial owner of such shares of Common Stock for purposes of Section 13(d) of the Exchange Act, or for any other purpose, and such beneficial ownership is expressly disclaimed.

Accordingly, each of the Mill Road Reporting Persons may be deemed to beneficially own an aggregate of 1,315,549 shares of Common Stock, or approximately 10.0% (9.953% rounded to three decimal places) of the outstanding shares of Common Stock, and the Mill Road Reporting Persons may be deemed to beneficially own, in the aggregate, 1,315,549 shares of Common Stock, or approximately 10.0% (9.953% rounded to three decimal places) of the outstanding shares of Common Stock.

Lane Five Reporting Persons.

(a, b) The cover page to this Schedule 13D for each Lane Five Reporting Person is incorporated by reference in its entirety into these paragraphs (a, b) of this Item 5.

The Lane Five Fund directly holds, and thus has sole voting and dispositive power over, 326,236 shares of Common Stock. The Lane Five Fund GP, as sole general partner of the Lane Five Fund, also has sole authority to vote (or direct the vote of), and to dispose (or direct the disposal) of, these shares of Common Stock. Pursuant to management contracts with the Lane Five Fund and the Pleiades Fund, respectively, the Lane Five Advisor has sole authority to vote (or direct the vote of), and to dispose (or direct the disposal) of, these 326,236 shares of Common Stock and the 157,542 shares of Common Stock directly held by the Pleiades Fund. The Lane Five Advisor GP, as sole general partner of the Lane Five Advisor, also has sole authority to vote (or direct the vote of), and to dispose (or direct the disposal) of, the shares of Common Stock beneficially owned by the Lane Five Advisor. Ms. Rapuano, as a managing member of the Lane Five Fund GP, has sole authority to vote (or direct the vote of), and to dispose (or direct the disposal) of, the shares of Common Stock beneficially owned by the Lane Five Fund GP, and, as a managing member of the Lane Five Advisor GP, has sole authority to vote (or direct the vote of), and to dispose (or direct the disposal) of, the shares of Common Stock beneficially owned by the Lane Five Advisor GP.

As a result of the Voting Agreement and the Novation Agreement, each of the Lane Five Fund and the Lane Five Fund GP may be deemed to have beneficial ownership of the 831,771 shares of Common Stock directly held by the Mill Road Fund II and the 157,542 shares of Common Stock directly held by the Pleiades Fund. Except to the extent that the Lane Five Fund or the Lane Five Fund GP may be so deemed to have beneficial ownership of these 989,313 shares of Common Stock, neither the filing of this Schedule 13D nor any of its contents shall be deemed to constitute an admission by either of the Lane Five Fund or the Lane Five Fund GP that such Lane Five Reporting Person is the beneficial owner of such shares of Common Stock for purposes of Section 13(d) of the Exchange Act, or for any other purpose, and such beneficial ownership is expressly disclaimed.

As a result of the Voting Agreement and the Novation Agreement, each of the Lane Five Advisor, the Lane Five Advisor GP and Ms. Rapuano may be deemed to have beneficial ownership of the 831,771 shares of Common Stock directly held by the Mill Road Fund II. Except to the extent that the Lane Five Advisor, the Lane Five Advisor GP or Ms. Rapuano may be so deemed to have beneficial ownership of these 831,771 shares of Common Stock, neither the filing of this Schedule 13D nor any of its contents shall be deemed to constitute an admission by any of the Lane Five Advisor, the Lane Five Advisor GP or Ms. Rapuano that such Lane Five Reporting Person is the beneficial owner of such shares of Common Stock for purposes of Section 13(d) of the Exchange Act, or for any other purpose, and such beneficial ownership is expressly disclaimed.

Accordingly, each of the Lane Five Reporting Persons may be deemed to beneficially own an aggregate of 1,315,549 shares of Common Stock, or approximately 10.0% (9.953% rounded to three decimal places) of the outstanding shares of Common Stock, and the Lane Five Reporting Persons may be deemed to beneficially own, in the aggregate, 1,315,549 shares of Common Stock, or approximately 10.0% (9.953% rounded to three decimal places) of the outstanding shares of Common Stock.

The Pleiades Entities.

(a, b) The cover page to this Schedule 13D for the Pleiades Fund is incorporated by reference in its entirety into these paragraphs (a, b) of this Item 5.

The Pleiades Fund directly holds, and thus has sole voting and dispositive power over, 157,542 shares of Common Stock. VPHI, as sole general partner of the Pleiades Fund, also has sole authority to vote (or direct the vote of), and to dispose (or direct the disposal) of, these shares of Common Stock. Veritable, as the sole stockholder of VPHI, may be deemed to have beneficial ownership of the shares of Common Stock beneficially owned by VPHI.

As a result of the Voting Agreement and the Novation Agreement, each Pleiades Entity may be deemed to have beneficial ownership of the 831,771 shares of Common Stock directly held by the Mill Road Fund II and the 326,236 shares of Common Stock directly held by the Lane Five Fund. Except to the extent that any Pleiades Entity may be so deemed to have beneficial ownership of these 1,158,007 shares of Common Stock, neither the filing of this Schedule 13D nor any of its contents shall be deemed to constitute an admission by any Pleiades Entity that it is the beneficial owner of such shares of Common Stock for purposes of Section 13(d) of the Exchange Act, or for any other purpose, and such beneficial ownership is expressly disclaimed.

Accordingly, each of the Pleiades Entities may be deemed to beneficially own an aggregate of 1,315,549 shares of Common Stock, or approximately 10.0% (9.953% rounded to three decimal places) of the outstanding shares of Common Stock, and the Pleiades Entities may be deemed to beneficially own, in the aggregate, 1,315,549 shares of Common Stock, or approximately 10.0% (9.953% rounded to three decimal places) of the outstanding shares of Common Stock.

The Reporting Persons.

(a, b) Accordingly, the Reporting Persons may be deemed to beneficially own, in the aggregate, 1,315,549 shares of Common Stock, or approximately 10.0% (9.953% rounded to three decimal places) of the outstanding shares of Common Stock.

*            *             *

The disclosures required by paragraphs (c), (d) and (e) of Item 5 of Schedule 13D under the Exchange Act for all of the Extended Reporting Persons are set forth below.

(c) On the Transfer Date, the Mill Road Fund II acquired 831,771 of Common Stock from the Mill Road Fund for a cash price per share of $3.50 (which does not include any

brokerage commissions or other transaction costs). No Reporting Person or other Pleiades Entity effected any other transaction in the shares of Common Stock from March 13, 2013 (the day after the filing of Amendment No. 4 to this Schedule 13D) to March 21, 2013.

(d) No person other than the Reporting Persons is known to have the right to receive or the power to direct the receipt of dividends from or the proceeds from the sale of shares of Common Stock.

(e) On the Transfer Date, each of the Mill Road Fund and the Mill Road Fund GP ceased to be the beneficial owner of any shares of Common Stock.

On November 9, 2012, the Mill Road Fund entered into the Voting Agreement with the Lane Five Fund, the Lane Five Advisor and the Pleiades Fund (collectively, the “Supporting Parties”). The Voting Agreement is attached hereto as Exhibit 5 and incorporated by reference into this Item 6. On March 18, 2013, the Mill Road Fund II, the Mill Road Fund and the Supporting Parties entered into the Novation Agreement for purposes of effecting the novation of the Voting Agreement, effective as of the Transfer Date, to substitute the Mill Road Fund II in place of the Mill Road Fund for all purposes of the Voting Agreement. The Novation Agreement is attached hereto as Exhibit 6 and incorporated by reference into this Item 6. For the remainder of this Item 6, references to the “Voting Agreement” shall refer to the Voting Agreement, as modified by the Novation Agreement.

Pursuant to the Voting Agreement:

(i) each of the Mill Road Fund II and the Supporting Parties agreed that it will not, and will not permit any of its affiliates to, except as contemplated by the Voting Agreement, (1) transfer any equity securities of the Issuer other than in connection with an acquisition of control of the Issuer by the Mill Road Fund II or an affiliate thereof (an “Acquisition”), (2) acquire (except for acquisitions by the Mill Road Fund II) any equity securities of the Issuer other than in connection with an Acquisition, and (3) deposit any equity securities of the Issuer into a voting trust, grant any proxy or power of attorney with respect to the voting of any equity securities of the Issuer, or enter into or otherwise create any voting agreement or other arrangement with respect to the voting of any equity securities of the Issuer;

(ii) each of the Supporting Parties agreed to cause all equity securities of the Issuer over which such Supporting Party has voting power to be voted (1) in favor of the approval of any Acquisition and (2) against any proposal, offer or invitation to the Issuer, other than one made by the Mill Road Fund II, that involves the acquisition of control of the Issuer, a sale of all or a substantial part of the assets of the Issuer, a restructuring or recapitalization of the Issuer, or any other transaction that could adversely affect, prevent or materially reduce the likelihood of the consummation of an Acquisition (any such proposal, offer or invitation being referred to in this Schedule 13D as a “Competing Proposal”);

(iii) each of the Supporting Parties irrevocably and unconditionally waived, and agreed not to exercise or assert, any appraisal or similar rights in connection with any Acquisition;

(iv) each of the Supporting Parties agreed that it would not, and that it would cause its affiliates not to, take certain actions, including, among others, (1) making a Competing Proposal, (2) joining with or inviting any other person to be involved in the making of any Competing Proposal, (3) providing any information to any other person with a view to any other person’s pursuing or considering to pursue a Competing Proposal, (4) encouraging or supporting (or providing encouragement or support to) any Competing Proposal or any person opposing an Acquisition, and (5) financing or offering to finance any Competing Proposal; and

(v) each of the Supporting Parties was given the option, in connection with the consummation of any Acquisition, to roll over the equity securities of the Issuer held by such Supporting Party into an entity controlled by the Mill Road Fund II that becomes a direct or indirect parent of the Issuer as a result of the consummation of such Acquisition (an “Acquisition Parent”).

The Voting Agreement terminates on the earliest to occur of (1) November 9, 2013, (2) the agreement of the Mill Road Fund II and the Supporting Parties to cause such termination, (3) the consummation of an Acquisition, and (4) certain other events described in the Voting Agreement.

In connection with the Voting Agreement, the Mill Road Fund, the Lane Five Fund and the Pleiades Fund entered into a non-binding term sheet dated as of November 9, 2012 regarding the structure of the Acquisition Parent. This term sheet is attached hereto as Exhibit 7 and incorporated by reference into this Item 6.

[signature pages follow]

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.

Annex I

Item 2 Disclosure for Certain Persons Related to the Pleiades Entities

The sole director of VPHI is Michael A. Stolper.

The executive officers (and titles) of Veritable, LP (“Veritable”) are:

Veritable does not have any directors.

All of the foregoing natural persons listed on this Annex I are referred to collectively in this Annex I as the “Directors and Officers.”

Exhibit 1

Exhibit 1

JOINT FILING AGREEMENT

Pursuant to Rule 13d-1(k)(1) under the Securities Exchange Act of 1934, as amended (the “Exchange Act”), the undersigned hereby agree, as of March 21, 2013, that only one statement containing the information required by Schedule 13D under the Exchange Act, whether an initial such statement or any amendment thereto, need be filed with respect to the ownership by each of the undersigned of shares of common stock, $0.0001 par value, of Learning Tree International, Inc., a Delaware corporation, and such statement to which this Joint Filing Agreement is attached as Exhibit 1 is, and any such amendment filed while this Joint Filing Agreement is in effect shall be, filed on behalf of each of the undersigned.

Exhibit 6

NOVATION AGREEMENT

(Voting Agreement)

This Novation Agreement (Voting Agreement) dated as of March 18, 2013 (this “Agreement”) is made by and among Mill Road Capital, L.P., a Delaware limited partnership (“Mill Road”), Mill Road Capital II, L.P, a Delaware limited partnership and an affiliate of Mill Road (“Mill Road II”), Lane Five Partners LP, a Delaware limited partnership (the “Lane Five Fund”), Lane Five Capital Management LP, a Delaware limited partnership (the “Lane Five Advisor”), and Pleiades Investment Partners – LA, L.P., a Delaware limited partnership (the “Pleiades Fund”).

WHEREAS, Mill Road, the Lane Five Fund, the Lane Five Advisor and the Pleiades Fund (collectively, the “Original Parties”) entered into a Voting Agreement dated as of November 9, 2012 (the “Voting Agreement”), and Mill Road desires to transfer (the “Transfer”) 831,771 shares of common stock, $0.0001 par value, of Learning Tree International, Inc. to Mill Road II; and

WHEREAS, the Original Parties desire to consent to the Transfer and, upon the effectiveness thereof, to novate the Voting Agreement to substitute Mill Road II in place of Mill Road for all purposes thereof;

NOW, THEREFORE, in consideration of the premises and mutual covenants contained herein, and for other good and valuable consideration, the adequacy and sufficiency of which are hereby acknowledged, the parties hereto hereby agree as follows:

SECTION 1. Transfer and Novation.

1.1 Consent. The Original Parties hereby consent to the Transfer in accordance with Section 2(a) of the Voting Agreement.

1.2 Novation. The Original Parties and Mill Road II hereby agree to the novation, effective immediately upon the effectiveness of the Transfer (the “Effective Time”), of the Voting Agreement so that, upon and after the Effective Time:

1.3 Assignment, Assumption and Delegation of Rights and Obligations.

1.4 Amendment and Restatement of Exhibit A to the Voting Agreement. The Voting Agreement is hereby amended, effective as of the Effective Time, by amending and restating Exhibit A thereto in the form of Annex I attached hereto.

SECTION 2. Representations and Warranties. Each party hereto represents and warrants to each other party that (a) such party has all requisite capacity, power and authority to enter into this Agreement, (b) the execution and delivery of this Agreement by such party have been duly and validly authorized by all necessary action on the part of such party, (c) this Agreement has been duly executed and delivered by such party, and (d) if such party is executing and delivering this Agreement on behalf of another party, such executing party has all requisite capacity, power and authority to enter into this Agreement on behalf of such other party and to bind such other party to the terms hereof.

SECTION 3. Miscellaneous.

3.1 Entire Agreement; Effect on Voting Agreement. This Agreement constitutes and contains the entire agreement and understanding of the parties with respect to the subject matter hereof and supersedes any and all prior negotiations, commitments, agreements, understandings, duties and obligations among them respecting the subject matter hereof. Except as expressly modified hereby, the terms and conditions of the Voting Agreement shall remain in full force and effect.

3.2 Governing Law; Submission to Jurisdiction. This Agreement shall be governed by, and construed in accordance with, the laws of the State of Delaware regardless of the laws that might otherwise govern under applicable principles of conflicts of laws thereof.

3.3 Amendment and Waiver. No waiver, amendment or other modification of this Agreement shall be effective unless in writing and signed by all of the parties hereto. This Agreement shall inure to the benefit of and be binding on each party and their respective legal representatives, successors and permitted assigns.

3.4. Counterparts. This Agreement may be executed in any number of counterparts, each such counterpart shall be deemed to be an original instrument, and all such counterparts together shall constitute but one agreement. Counterparts may be delivered via facsimile, electronic mail with digital attachment (including .pdf or .tiff) or other transmission method, and any counterpart so delivered shall be deemed to have been duly and validly delivered and be valid and effective for all purposes.

[signature page follows]

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IN WITNESS WHEREOF, the parties hereto have executed this Novation Agreement (Voting Agreement) as an instrument under seal as of the day and year first written above.

[Signature Page to Novation Agreement (Voting Agreement)]

[Signature Page to Novation Agreement (Voting Agreement)]

EXHIBIT A

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