UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 SCHEDULE 13G/A AMENDMENT NO. 3 UNDER THE SECURITIES EXCHANGE ACT OF 1934 MERRIMAC INDUSTRIES, INC. (Name of Issuer) COMMON STOCK, $.01 PAR VALUE (Title of Class of Securities) 590262101 (CUSIP Number) March 13, 2007 (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) |X| Rule 13d-1(c) |_| Rule 13d-1(d) *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 the disclosures provided in a prior cover page. 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). -------------------------------------------------------------------------------- 1. NAME OF REPORTING PERSON S.S. OR I.R.S. IDENTIFICATION NUMBER OF ABOVE PERSON RICHARD GROSSMAN -------------------------------------------------------------------------------- 2. CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP* (a) |X| (b) |_| -------------------------------------------------------------------------------- 3. SEC USE ONLY -------------------------------------------------------------------------------- 4. CITIZENSHIP OR PLACE OF ORGANIZATION UNITED STATES -------------------------------------------------------------------------------- 5. SOLE VOTING POWER 0 NUMBER OF ----------------------------------------------------------------- SHARES 6. SHARED VOTING POWER BENEFICIALLY OWNED BY 0 EACH ----------------------------------------------------------------- REPORTING 7. SOLE DISPOSITIVE POWER PERSON WITH: 0 ----------------------------------------------------------------- 8. SHARED DISPOSITIVE POWER 0 -------------------------------------------------------------------------------- 9. AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON. 0 -------------------------------------------------------------------------------- 10. CHECK BOX IF THE AGGREGATE AMOUNT IN ROW 9 EXCLUDES CERTAIN SHARES* |_| -------------------------------------------------------------------------------- 11. PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9. 0% -------------------------------------------------------------------------------- 12. TYPE OF REPORTING PERSON* IN -------------------------------------------------------------------------------- - 2 - -------------------------------------------------------------------------------- 1. NAME OF REPORTING PERSON S.S. OR I.R.S. IDENTIFICATION NUMBER OF ABOVE PERSON ORIN HIRSCHMAN -------------------------------------------------------------------------------- 2. CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP* (a) |X| (b) |_| -------------------------------------------------------------------------------- 3. SEC USE ONLY -------------------------------------------------------------------------------- 4. CITIZENSHIP OR PLACE OF ORGANIZATION UNITED STATES -------------------------------------------------------------------------------- 5. SOLE VOTING POWER 0 NUMBER OF ----------------------------------------------------------------- SHARES 6. SHARED VOTING POWER BENEFICIALLY OWNED BY 0 EACH ----------------------------------------------------------------- REPORTING 7. SOLE DISPOSITIVE POWER PERSON WITH: 0 ----------------------------------------------------------------- 8. SHARED DISPOSITIVE POWER 0 -------------------------------------------------------------------------------- 9. AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON. 0 -------------------------------------------------------------------------------- 10. CHECK BOX IF THE AGGREGATE AMOUNT IN ROW 9 EXCLUDES CERTAIN SHARES* |_| -------------------------------------------------------------------------------- 11. PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9. 0% -------------------------------------------------------------------------------- 12. TYPE OF REPORTING PERSON* IN -------------------------------------------------------------------------------- - 3 - -------------------------------------------------------------------------------- 1. NAME OF REPORTING PERSON S.S. OR I.R.S. IDENTIFICATION NUMBER OF ABOVE PERSON ADAM SMITH CAPITAL MANAGEMENT LLC -------------------------------------------------------------------------------- 2. CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP* (a) |X| (b) |_| -------------------------------------------------------------------------------- 3. SEC USE ONLY -------------------------------------------------------------------------------- 4. CITIZENSHIP OR PLACE OF ORGANIZATION NEW YORK -------------------------------------------------------------------------------- 5. SOLE VOTING POWER 0 NUMBER OF ----------------------------------------------------------------- SHARES 6. SHARED VOTING POWER BENEFICIALLY OWNED BY 0 EACH ----------------------------------------------------------------- REPORTING 7. SOLE DISPOSITIVE POWER PERSON WITH: 0 ----------------------------------------------------------------- 8. SHARED DISPOSITIVE POWER 0 -------------------------------------------------------------------------------- 9. AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON. 0 -------------------------------------------------------------------------------- 10. CHECK BOX IF THE AGGREGATE AMOUNT IN ROW 9 EXCLUDES CERTAIN SHARES* |_| -------------------------------------------------------------------------------- 11. PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9. 0% -------------------------------------------------------------------------------- 12. TYPE OF REPORTING PERSON* OO -------------------------------------------------------------------------------- - 4 - -------------------------------------------------------------------------------- 1. NAME OF REPORTING PERSON S.S. OR I.R.S. IDENTIFICATION NUMBER OF ABOVE PERSON ADAM SMITH INVESTMENT PARTNERS, L.P. -------------------------------------------------------------------------------- 2. CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP* (a) |X| (b) |_| -------------------------------------------------------------------------------- 3. SEC USE ONLY -------------------------------------------------------------------------------- 4. CITIZENSHIP OR PLACE OF ORGANIZATION NEW YORK -------------------------------------------------------------------------------- 5. SOLE VOTING POWER 0 NUMBER OF ----------------------------------------------------------------- SHARES 6. SHARED VOTING POWER BENEFICIALLY OWNED BY 0 EACH ----------------------------------------------------------------- REPORTING 7. SOLE DISPOSITIVE POWER PERSON WITH: 0 ----------------------------------------------------------------- 8. SHARED DISPOSITIVE POWER 0 -------------------------------------------------------------------------------- 9. AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON. 0 -------------------------------------------------------------------------------- 10. CHECK BOX IF THE AGGREGATE AMOUNT IN ROW 9 EXCLUDES CERTAIN SHARES* |_| -------------------------------------------------------------------------------- 11. PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9. 0% -------------------------------------------------------------------------------- 12. TYPE OF REPORTING PERSON* PN -------------------------------------------------------------------------------- - 5 - -------------------------------------------------------------------------------- 1. NAME OF REPORTING PERSON S.S. OR I.R.S. IDENTIFICATION NUMBER OF ABOVE PERSON DIAMOND CAPITAL MANAGEMENT INC. -------------------------------------------------------------------------------- 2. CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP* (a) |X| (b) |_| -------------------------------------------------------------------------------- 3. SEC USE ONLY -------------------------------------------------------------------------------- 4. CITIZENSHIP OR PLACE OF ORGANIZATION NEW YORK -------------------------------------------------------------------------------- 5. SOLE VOTING POWER 0 NUMBER OF ----------------------------------------------------------------- SHARES 6. SHARED VOTING POWER BENEFICIALLY OWNED BY 0 EACH ----------------------------------------------------------------- REPORTING 7. SOLE DISPOSITIVE POWER PERSON WITH: 0 ----------------------------------------------------------------- 8. SHARED DISPOSITIVE POWER 0 -------------------------------------------------------------------------------- 9. AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON. 0 -------------------------------------------------------------------------------- 10. CHECK BOX IF THE AGGREGATE AMOUNT IN ROW 9 EXCLUDES CERTAIN SHARES* |_| -------------------------------------------------------------------------------- 11. PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9. 0% -------------------------------------------------------------------------------- 12. TYPE OF REPORTING PERSON* CO -------------------------------------------------------------------------------- - 6 - -------------------------------------------------------------------------------- 1. NAME OF REPORTING PERSON S.S. OR I.R.S. IDENTIFICATION NUMBER OF ABOVE PERSON ADAM SMITH INVESTMENTS, LTD. -------------------------------------------------------------------------------- 2. CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP* (a) |X| (b) |_| -------------------------------------------------------------------------------- 3. SEC USE ONLY -------------------------------------------------------------------------------- 4. CITIZENSHIP OR PLACE OF ORGANIZATION BRITISH VIRGIN ISLANDS -------------------------------------------------------------------------------- 5. SOLE VOTING POWER 0 NUMBER OF ----------------------------------------------------------------- SHARES 6. SHARED VOTING POWER BENEFICIALLY OWNED BY 0 EACH ----------------------------------------------------------------- REPORTING 7. SOLE DISPOSITIVE POWER PERSON WITH: 0 ----------------------------------------------------------------- 8. SHARED DISPOSITIVE POWER 0 -------------------------------------------------------------------------------- 9. AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON. 0 -------------------------------------------------------------------------------- 10. CHECK BOX IF THE AGGREGATE AMOUNT IN ROW 9 EXCLUDES CERTAIN SHARES* |_| -------------------------------------------------------------------------------- 11. PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9. 0% -------------------------------------------------------------------------------- 12. TYPE OF REPORTING PERSON* CO -------------------------------------------------------------------------------- - 7 - -------------------------------------------------------------------------------- 1. NAME OF REPORTING PERSON S.S. OR I.R.S. IDENTIFICATION NUMBER OF ABOVE PERSON RICHARD AND ANA GROSSMAN JTWROS -------------------------------------------------------------------------------- 2. CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP* (a) |X| (b) |_| -------------------------------------------------------------------------------- 3. SEC USE ONLY -------------------------------------------------------------------------------- 4. CITIZENSHIP OR PLACE OF ORGANIZATION NEW YORK -------------------------------------------------------------------------------- 5. SOLE VOTING POWER 0 NUMBER OF ----------------------------------------------------------------- SHARES 6. SHARED VOTING POWER BENEFICIALLY OWNED BY 0 EACH ----------------------------------------------------------------- REPORTING 7. SOLE DISPOSITIVE POWER PERSON WITH: 0 ----------------------------------------------------------------- 8. SHARED DISPOSITIVE POWER 0 -------------------------------------------------------------------------------- 9. AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON. 0 -------------------------------------------------------------------------------- 10. CHECK BOX IF THE AGGREGATE AMOUNT IN ROW 9 EXCLUDES CERTAIN SHARES* |_| -------------------------------------------------------------------------------- 11. PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9. 0% -------------------------------------------------------------------------------- 12. TYPE OF REPORTING PERSON* IN -------------------------------------------------------------------------------- - 8 - SCHEDULE 13G Item 1(a) Name of Issuer: Merrimac Industries, Inc. Item 1(b) Address of Issuer's Principal Executive Offices: 41 Fairfield Place, West Caldwell, New Jersey 07006 Item 2(a) Names of Persons Filing: Richard Grossman, Orin Hirschman, Adam Smith Capital Management LLC ("ASCM"), Diamond Capital Management ("DCM"), Adam Smith Investments, Ltd. ("ASI"), Adam Smith Investment Partners, L.P. ("ASIP"), Richard and Ana Grossman JTWROS. Item 2(b) Addresses of Principal Business Offices: The principal executive offices of ASCM, ASIP and DCM, and the business address of Richard Grossman, are located c/o Richard Grossman, 259 Oakford Street, West Hempstead, NY 11552, and Orin Hirschman, 6006 Berkeley Ave., Baltimore, MD 21209. The principal executive office of ASI is c/o Insinger Trust (BVI) Limited, Tropic Isle Building, P.O. Box 438, Road Town, Tortola, British Virgin Islands. Item 2(c) Citizenship: ASCM is a New York limited liability company, DCM is a New York corporation, ASI is a British Virgin Islands corporation, and ASIP is a New York limited partnership. Richard Grossman, Ana Grossman, and Orin Hirschman are citizens of the United States. Item 2(d) Title of Class of Securities: Common Stock (the "Shares"). Item 2(e) CUSIP Number: 590262101 Item 3. Type of Reporting Person: N/A Item 4. Ownership a. Amount Beneficially Owned: 0 Shares - 9 - b. Percent of class 0% c. Number of shares as to which such person has: i. Sole power to vote or to direct the vote 0 ii. Shared power to vote or to direct the vote 0 iii. Sole power to dispose or to direct the disposition of 0 iv. Shared power to dispose or to direct the disposition of 0 Item 5. Ownership of Five Percent or Less of a Class: 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 five percent of the class of securities, check the following. |X| Item 6. Ownership of More than Five Percent on behalf of Another Person. N/A Item 7. Identification and Classification of the Subsidiary Which Acquired the Security Being Reporting on by the Parent Holding Company: N/A Item 8. Identification and Classification of Members of the Group. This Statement is filed by Richard Grossman and Orin Hirschman by virtue of their former beneficial ownership of Shares, directly and indirectly as the owners of each of ASCM and DCM, and as the sole holders of the Common Stock of ASI; by DCM by virtue of being the Investment Manager of ASI; by ASCM, by virtue of being the sole general partner of ASIP; and by ASI and ASIP by virtue of their former direct beneficial ownership of Shares. By virtue of the relationships described above, each of Richard Grossman and Orin Hirschman may have been formerly deemed to possess indirect beneficial ownership of the Shares held by each entity. The directors of ASI are F.M.C. Limited and S.C.S. Limited, which are subsidiaries of Insinger Trust (BVI) Limited, all of which are British Virgin - 10 - Islands corporations. Richard Grossman and Orin Hirschman are the only officers and directors of ASC and DCM, and the only member-managers of ASCM. This Statement is filed by Richard and Ana Grossman JTWROS, by virtue of their former direct beneficial ownership of Shares. Item 9. Notice of Dissolution of Group: N/A Item 10. Certification: By signing below the undersigned certify that to the best of their 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 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, the undersigned certify that the information set forth in this statement is true, complete and correct. Date: March 21, 2007 /s/ Richard Grossman ----------------------- Richard Grossman /s/ Orin Hirschman ----------------------- Orin Hirschman ADAM SMITH CAPITAL MANAGEMENT, L.L.C., By: /s/ Richard Grossman ------------------------------------- Richard Grossman, Manager ADAM SMITH INVESTMENT PARTNERS, L.P. By: ADAM SMITH CAPITAL MANAGEMENT, L.L.C., General Partner By: /s/ Richard Grossman ----------------------------- Richard Grossman, Manager DIAMOND CAPITAL MANAGEMENT INC. By: /s/ Richard Grossman ------------------------------------- Richard Grossman, Vice President - 11 - ADAM SMITH INVESTMENTS, LTD. By: DIAMOND CAPITAL MANAGEMENT INC., investment advisor By: /s/ Richard Grossman -------------------------- Richard Grossman RICHARD AND ANA GROSSMAN JTWROS By: /s/ Richard Grossman ----------------------------------- Richard Grossman By: /s/ Ana Grossman ----------------------------------- Ana Grossman