UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549

                                 Schedule 13G/A
                                (Amendment No.4)

                    Under the Securities Exchange Act of 1934

                       Atlantic Technology Ventures, Inc.
                       ----------------------------------

                     Common Stock, par value $.001 per share
                         (Title of Class of Securities)

                                February 10, 2001

                            (CUSIP Number: 048913107)

                               December 31, 2000
                               -----------------
                           Date of event which requires filing


Check the appropriate box to designate the rule pursuant to which the 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
disclosures provided in a prior cover page.

The information required in the remainder of this cover page shall not be deemed
to be filled for the purpose of Section 18 of the Securities Exchange Act of
1934 (the "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 to Schedule 13G).


                                       1

CUSIP No. 048785109 13G Page 2 of 5 - -------------------------------------------------------------------------------- 1 NAME OF REPORTING PERSON S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON Lindsay A. Rosenwald, M.D. - -------------------------------------------------------------------------------- 2 CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP* (a) |_| (b) |_| - -------------------------------------------------------------------------------- 3 SEC USE ONLY - -------------------------------------------------------------------------------- 4 CITIZENSHIP OR PLACE OF ORGANIZATION United States - -------------------------------------------------------------------------------- 5 SOLE VOTING POWER 498,918(1) -------------------------------------------------------------- NUMBER OF 6 SHARED VOTING POWER SHARES BENEFICIALLY None OWNED BY -------------------------------------------------------------- EACH 7 SOLE DISPOSITIVE POWER REPORTING PERSON 498,918(1) WITH -------------------------------------------------------------- 8 SHARED DISPOSITIVE POWER None - -------------------------------------------------------------------------------- 9 AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 498,918(1) - -------------------------------------------------------------------------------- 10 CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES* |_| - -------------------------------------------------------------------------------- 11 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9) 8.4% - -------------------------------------------------------------------------------- 12 TYPE OF REPORTING PERSON* IN - -------------------------------------------------------------------------------- *SEE INSTRUCTIONS BEFORE FILLING OUT ITEM 1(a). NAME OF ISSUER: Atlantic Technology Ventures, Inc. (the "Company") ITEM 1(b). ADDRESS OF ISSUER'S PRINCIPAL EXECUTIVE OFFICES: 150 Broadway, Suite 1110 New York, NY 10038 - ---------- (1) Includes 344,508 shares of common stock of the Issuer and 154,410 shares of common stock issuable upon conversion of Series A Convertible Stock (the "Preferred Stock") underlying warrants to purchase 47,202 shares of Preferred Stock. Also includes 190 shares of common stock held by June Street Corporation and 190 shares of common stock held by Huntington Street Corporation. Dr. Rosenwald is the sole proprietor of each of June Street Corporation and Huntington Street Corporation. 2

ITEM 2(a) NAME OF PERSON FILING: Lindsay A. Rosenwald, M.D. ("Dr. Rosenwald") ITEM 2(b) ADDRESS OF PRINCIPAL BUSINESS OFFICE OR, IF NONE, RESIDENCE: 787 Seventh Avenue, 48th Floor New York, N.Y. 10019 ITEM 2(c). CITIZENSHIP: Dr. Rosenwald is a citizen of the United States of America. ITEM 2(d). TITLE OF CLASS OF SECURITIES: Common Stock, $0.001 par value. ITEM 2(e). CUSIP NUMBER: 048913107 ITEM 3. |X| CHECK THIS BOX IF THIS STATEMENT IS FILED PURSUANT TO RULE 13d-1(c) ITEM 4. OWNERSHIP For information concerning the ownership of Common Stock of the Company by the Reporting Persons, see Items 5 through 9 and 11 of the cover pages to this schedule 13G and footnotes thereto. ITEM 5. OWNERSHIP OF FIVE PERCENT OR LESS OF A CLASS Not applicable ITEM 6. OWNERSHIP OF MORE THAN FIVE PERCENT ON BEHALF OF ANOTHER PERSON Not applicable ITEM 7. IDENTIFICATION AND CLASSIFICATION OF THE SUBSIDIARY WHICH ACQUIRED THE SECURITY BEING REPORTED ON BY THE PARENT HOLDING COMPANY Not Applicable ITEM 8. IDENTIFICATION AND CLASSIFICATION OF MEMBERS OF THE GROUP Not Applicable ITEM 9. NOTICE OF DISSOLUTION OF GROUP Not Applicable ITEM 10. CERTIFICATION 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 a transaction having that purpose and effect. 3

SIGNATURES 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. Dated: February 10, 2001 New York, New York /s/ Lindsay A. Rosenwald -------------------------------------- Lindsay A. Rosenwald, M.D.