UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549
                                  SCHEDULE 13G
                    UNDER THE SECURITIES EXCHANGE ACT OF 1934

                         REGENERATION TECHNOLOGIES, INC.
                                (Name of Issuer)

                                  COMMON STOCK
                         (Title of Class of Securities)

                                    75886N100
                                 (CUSIP Number)

                                DECEMBER 31, 2006
             (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).



PERSONS WHO ARE TO RESPOND TO THE COLLECTION OF INFORMATION CONTAINED IN THIS
FORM ARE NOT REQUIRED TO RESPOND UNLESS THE FORM DISPLAYS A CURRENTLY VALID OMB
CONTROL NUMBER.

SEC 1745 (12-02)








--------------------------------------- --------------------------------------- --------------------------------------

                                                                                     
CUSIP No. 75886N100                                      13G                              Page 2 of 6 Pages
--------------------------------------- --------------------------------------- --------------------------------------

--------- ------------------------------------------------------------------------------------------------------------
1.
          NAMES OF REPORTING PERSONS
          I.R.S. IDENTIFICATION NO. OF ABOVE PERSONS (ENTITIES ONLY)

          NEIL GAGNON

--------- ------------------------------------------------------------------------------------------------------------
--------- ------------------------------------------------------------------------------------------------------------
2.
          CHECK THE APPROPRIATE BOX IF A GROUP*                                                            (a)
                                                                                                           (b) |X|
--------- ------------------------------------------------------------------------------------------------------------
--------- ------------------------------------------------------------------------------------------------------------
3.        SEC USE ONLY



--------- ------------------------------------------------------------------------------------------------------------
--------- ------------------------------------------------------------------------------------------------------------
4.
          CITIZENSHIP OR PLACE OF ORGANIZATION

          UNITED STATES OF AMERICA

--------- ------------------------------------------------------------------------------------------------------------
------------------- ----- --------------------------------------------- ----------------------------------------------
    NUMBER OF       5.
      SHARES              SOLE VOTING POWER                                                                 1,518,019
------------------- ----- --------------------------------------------- ----------------------------------------------
------------------- ----- --------------------------------------------- ----------------------------------------------
   BENEFICIALLY     6.
     OWNED BY             SHARED VOTING POWER                                                                 638,604
------------------- ----- --------------------------------------------- ----------------------------------------------
------------------- ----- --------------------------------------------- ----------------------------------------------
       EACH         7.
    REPORTING             SOLE DISPOSITIVE POWER                                                            1,445,420
------------------- ----- --------------------------------------------- ----------------------------------------------
------------------- ----- --------------------------------------------- ----------------------------------------------
   PERSON WITH:     8.
                          SHARED DISPOSTIVE POWER                                                           2,032,201
------------------- ----- --------------------------------------------- ----------------------------------------------
--------- ---------------------------------------------------------------------------- -------------------------------
9.
          AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON                                      3,477,621
--------- ---------------------------------------------------------------------------- -------------------------------
--------- ------------------------------------------------------------------------------------------------------------
10.
          CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES (SEE INSTRUCTIONS)
--------- ------------------------------------------------------------------------------------------------------------
--------- ---------------------------------------------------------------------------- -------------------------------
11.
          PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)                                                   11.68 %
--------- ---------------------------------------------------------------------------- -------------------------------
--------- ---------------------------------------------------------------------------- -------------------------------
12.
          TYPE OF REPORTING PERSON (SEE INSTRUCTIONS)                                                    IN
--------- ---------------------------------------------------------------------------- -------------------------------










---------------------------------------- -------------------------------------- ----------------------------------------

CUSIP No. 75886N100                                       13G                              Page 3 of 6 Pages
---------------------------------------- -------------------------------------- ----------------------------------------


ITEM 1.
        (a)  Name of Issuer:                                     REGENERATION TECHNOLOGIES, INC.

        (b)  Address of Issuer's Principal Executive Offices:    11621 RESEARCH CIRCLE
                                                                 ALACHUA, FLORIDA 32615

ITEM 2.
        (a)  Name of Person Filing: NEIL GAGNON

        (b)  Address of Principal Business Office or, if none, Residence:
             1370 AVE. OF THE AMERICAS, SUITE 2400 NEW YORK, NY 10019

        (c)  Citizenship: US

        (d)  Title of Class of Securities: COMMON STOCK

        (e)  CUSIP Number: 866615107


ITEM 3. IF THIS STATEMENT IS FILED PURSUANT TO SS.SS.240.13D-1(B) OR
        240.13D-2(B) OR (C), CHECK WHETHER THE PERSON FILING IS A:
     (a)  [ ] Broker or dealer registered under section 15 of the Act (15 U.S.C.
          78o).
     (b)  [ ] Bank as defined in section 3(a)(6) of the Act (15 U.S.C. 78c).
     (c)  [ ] Insurance company as defined in section 3(a)(19) of the Act (15
          U.S.C. 78c).
     (d)  [ ] Investment company registered under section 8 of the Investment
          Company Act of 1940 (15 U.S.C 80a-8).
     (e)  [ ] An investment adviser in accordance with
          ss.240.13d-1(b)(1)(ii)(E);
     (f)  [ ] An employee benefit plan or endowment fund in accordance with
          ss.240.13d-1(b)(1)(ii)(F);
     (g)  [ ] A parent holding company or control person in accordance with ss.
          240.13d-1(b)(1)(ii)(G);
     (h)  [ ] A savings associations as defined in Section 3(b) of the Federal
          Deposit Insurance Act (12 U.S.C. 1813);
     (i)  [ ] A church plan that is excluded from the definition of an
          investment company under section 3(c)(14) of the Investment Company
          Act of 1940 (15 U.S.C. 80a-3);
     (j)  [ ] Group, in accordance with ss.240.13d-1(b)(1)(ii)(J).










---------------------------------------- -------------------------------------- ----------------------------------------

CUSIP No. 75886N100                                       13G                              Page 4 of 6 Pages
---------------------------------------- -------------------------------------- ----------------------------------------

ITEM 4.          OWNERSHIP.

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

     (a)       Amount beneficially owned:   As of December 31, 2006, Neil Gagnon  beneficially  owned 3,477,621 shares
                                            of Common Stock of Regeneration Technologies,  Inc., which amount includes
                                            (i)  647,033  shares  beneficially  owned by Mr.  Gagnon over which he has
                                            sole  voting  power  and  sole  dispositive   power;  (ii)  65,254  shares
                                            beneficially  owned by Mr.  Gagnon over which he has sole voting power and
                                            shared dispositive power; (iii) 396,890 shares  beneficially owned by Lois
                                            Gagnon,  Mr.  Gagnon's  wife,  over which he has shared  voting  power and
                                            shared  dispositive  power;  (iv) 7,280  shares  beneficially  owed by Mr.
                                            Gagnon and Mrs. Gagnon as Joint Tenants with Rights of Survivorship,  over
                                            which he has  shared  voting  power  and  shared  dispositive  power;  (v)
                                            107,663  shares  held by the Lois E. and Neil E.  Gagnon  Foundation  (the
                                            "Foundation"),  of which Mr.  Gagnon is a  trustee  and over  which he has
                                            shared  voting power and shared  dispositive  power;  (vi) 126,771  shares
                                            held by the Gagnon  Family  Limited  Partnership  (the  "Partnership")  of
                                            which   Mr.  Gagnon is a partner and over which he has shared voting power
                                            and shared  dispositive  power;  (vii)  110,623  shares held by the Gagnon
                                            Grandchildren  Trust  (the  "Trust")  over  which Mr.  Gagnon  has  shared
                                            dispositive power but no voting power;  (viii) 794,120 shares held by four
                                            hedge funds  (collectively,  the  "Funds"),  of which Mr. Gagnon is either
                                            the principal  executive  officer of the manager or the managing member of
                                            a member of the general  partner or the managing  member and over which he
                                            has sole dispositive  power and sole voting power;  (ix) 4,267 shares held
                                            by the Gagnon  Securities  LLC Profit  Sharing Plan and Trust (the "Plan")
                                            of which Mr.  Gagnon  is a Trustee  and over  which  Mr.  Gagnon  has sole
                                            dispositive  power and sole  voting  power;  (x) 7,345  shares held by the
                                            Plan over which Mr.  Gagnon has shared  dispositive  power and sole voting
                                            power;  and (xi)  1,210,375  shares held for certain  customers  of Gagnon
                                            Securities  LLC,  of which  Mr.  Gagnon  is the  managing  member  and the
                                            principal  owner and over  which he has  shared  dispositive  power but no
                                            voting power.

     (b)       Percent of class:            11.68%  beneficially  owned by Mr.  Gagnon.  Calculation  of percentage of
                                            beneficial  ownership  is based on  29,772,631  shares of Issuer's  Common
                                            Stock  outstanding  on  November 1,  2006 as reported by the Issuer in its
                                            Quarterly  Report filed on  November 9,  2006, on Form 10-Q for the period
                                            ended September 30, 2006.










---------------------------------------- -------------------------------------- ----------------------------------------

CUSIP No. 75886N100                                       13G                              Page 5 of 6 Pages
---------------------------------------- -------------------------------------- ----------------------------------------
     (c)       Number of shares as to which the person has:

                   (i) Sole power to vote or to direct the vote:
                                                                                                             1,518,019
                  (ii) Shared power to vote or to direct the vote:
                                                                                                               638,604

                 (iii) Sole power to dispose or to direct the disposition of:                                1,445,420

                  (iv) Shared  power to dispose or to direct the  disposition of:                            2,032,201

ITEM 5-9         Not Applicable

Filing of this statement by Mr. Gagnon shall not bee deemed an admission that he
beneficially owns the securities reported herein as held in customer accounts at
Gagnon Securities LLC or by the Foundation, the Partnership, the Trust, the
Funds or the Plan. Mr. Gagnon expressly disclaims beneficial ownership of all
securities held in such customer accounts or by the Foundation, the Partnership,
the Trust, the Funds or Plan. No single client's interest as reported in the
customer accounts at Gagnon Securities LLC exceeds 5% of the outstanding Common
Stock of the Issuer.


ITEM 10.         CERTIFICATION

(a)              The following certification shall be included if the statement is filed pursuant to ss.240.13d-1(b):

                      By signing below I certify that, to the best of my
                      knowledge and belief, the securities referred to above
                      were acquired and are held in the ordinary course of
                      business and 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. [X]







---------------------------------------- -------------------------------------- --------------------------------------

CUSIP No. 75886N100                                       13G                             Page 6 of 6 Pages
---------------------------------------- -------------------------------------- --------------------------------------


                                    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.


Feburary 7, 2007
Date
/s/ Neil Gagnon
---------------
Signature

Neil Gagnon
Name/Title



The original statement shall be signed by each person on whose behalf the
statement is filed or his authorized representative. If the statement is signed
on behalf of a person by his authorized representative other than an executive
officer or general partner of the filing person, evidence of the
representative's authority to sign on behalf of such person shall be filed with
the statement, provided, however, that a power of attorney for this purpose
which is already on file with the Commission may be incorporated by reference.
The name and any title of each person who signs the statement shall be typed or
printed beneath his signature.

NOTE: Schedules filed in paper format shall include a signed original and five
copies of the schedule, including all exhibits. SEE ss.240.13d-7 for other
parties for whom copies are to be sent.

ATTENTION:    INTENTIONAL MISSTATEMENTS OR OMISSIONS OF FACT CONSTITUTE FEDERAL CRIMINAL VIOLATIONS (SEE 18 U.S.C. 1001)