SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549
                                ----------------

                                  SCHEDULE 13G
                                ----------------



             INFORMATION STATEMENT PURSUANT TO RULES 13d-1 AND 13d-2
                    UNDER THE SECURITIES EXCHANGE ACT OF 1934

                           (Amendment No.__________*)

                   China Information Security Technology, Inc.
                                (NAME OF ISSUER)

                     Common Stock, par value $0.01 per share
                         (TITLE OF CLASS OF SECURITIES)

                                    16944F101
                                 (CUSIP NUMBER)

                                 January 7, 2010
             (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)






                             (Page 1 of 15 PAGES)
------------------

* 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).





CUSIP No. 16944F101                      13G                  PAGE 2 of 15 PAGES

--------------------------------------------------------------------------------
     (1)  NAME OF REPORTING PERSON
          S.S. OR I.R.S. IDENTIFICATION NO.
          OF ABOVE PERSON
          Ardsley Partners Fund II, 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
               Delaware
--------------------------------------------------------------------------------

NUMBER OF      (5)  SOLE VOTING POWER
                    0
SHARES         -----------------------------------------------------------------

BENEFICIALLY   (6)  SHARED VOTING POWER
                    1,188,850
OWNED BY       -----------------------------------------------------------------

EACH           (7)  SOLE DISPOSITIVE POWER
                    0
REPORTING      -----------------------------------------------------------------

PERSON WITH    (8)  SHARED DISPOSITIVE POWER
                    1,188,850
--------------------------------------------------------------------------------
     (9)  AGGREGATE AMOUNT BENEFICIALLY OWNED
          BY EACH REPORTING PERSON
                    1,188,850
--------------------------------------------------------------------------------
    (10)  CHECK BOX IF THE AGGREGATE AMOUNT
          IN ROW (9) EXCLUDES CERTAIN SHARES **                          [ ]
--------------------------------------------------------------------------------
    (11)  PERCENT OF CLASS REPRESENTED
          BY AMOUNT IN ROW (9)
          2.4%
--------------------------------------------------------------------------------
    (12)  TYPE OF REPORTING PERSON **
             PN
--------------------------------------------------------------------------------
                     ** SEE INSTRUCTIONS BEFORE FILLING OUT!




CUSIP No. 16944F101                      13G                  PAGE 3 of 15 PAGES

--------------------------------------------------------------------------------
     (1)  NAME OF REPORTING PERSON
          S.S. OR I.R.S. IDENTIFICATION NO.
          OF ABOVE PERSON
          Ardsley Partners Institutional Fund, 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
               Delaware
--------------------------------------------------------------------------------

NUMBER OF      (5)  SOLE VOTING POWER
                    0
SHARES         -----------------------------------------------------------------

BENEFICIALLY   (6)  SHARED VOTING POWER
                    925,350
OWNED BY       -----------------------------------------------------------------

EACH           (7)  SOLE DISPOSITIVE POWER
                    0
REPORTING      -----------------------------------------------------------------

PERSON WITH    (8)  SHARED DISPOSITIVE POWER
                    925,350
--------------------------------------------------------------------------------
     (9)  AGGREGATE AMOUNT BENEFICIALLY OWNED
          BY EACH REPORTING PERSON
                    925,350
--------------------------------------------------------------------------------
    (10)  CHECK BOX IF THE AGGREGATE AMOUNT
          IN ROW (9) EXCLUDES CERTAIN SHARES **                          [ ]
--------------------------------------------------------------------------------
    (11)  PERCENT OF CLASS REPRESENTED
          BY AMOUNT IN ROW (9)
          1.9%
--------------------------------------------------------------------------------
    (12)  TYPE OF REPORTING PERSON **
             PN
--------------------------------------------------------------------------------
                     ** SEE INSTRUCTIONS BEFORE FILLING OUT!






CUSIP No. 16944F101                      13G                  PAGE 4 of 15 PAGES

--------------------------------------------------------------------------------
     (1)  NAME OF REPORTING PERSON
          S.S. OR I.R.S. IDENTIFICATION NO.
          OF ABOVE PERSON
          Ardsley Offshore Fund, 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
--------------------------------------------------------------------------------

NUMBER OF      (5)  SOLE VOTING POWER
                    0
SHARES         -----------------------------------------------------------------

BENEFICIALLY   (6)  SHARED VOTING POWER
                    229,100
OWNED BY       -----------------------------------------------------------------

EACH           (7)  SOLE DISPOSITIVE POWER
                    0
REPORTING      -----------------------------------------------------------------

PERSON WITH    (8)  SHARED DISPOSITIVE POWER
                    229,100
--------------------------------------------------------------------------------
     (9)  AGGREGATE AMOUNT BENEFICIALLY OWNED
          BY EACH REPORTING PERSON
                    229,100
--------------------------------------------------------------------------------
    (10)  CHECK BOX IF THE AGGREGATE AMOUNT
          IN ROW (9) EXCLUDES CERTAIN SHARES **                          [ ]
--------------------------------------------------------------------------------
    (11)  PERCENT OF CLASS REPRESENTED
          BY AMOUNT IN ROW (9)
          0.5%
--------------------------------------------------------------------------------
    (12)  TYPE OF REPORTING PERSON **
             CO
--------------------------------------------------------------------------------
                     ** SEE INSTRUCTIONS BEFORE FILLING OUT!





CUSIP No. 16944F101                      13G                  PAGE 5 of 15 PAGES

--------------------------------------------------------------------------------
     (1)  NAME OF REPORTING PERSON
          S.S. OR I.R.S. IDENTIFICATION NO.
          OF ABOVE PERSON
          Ardsley Advisory Partners
--------------------------------------------------------------------------------
     (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
--------------------------------------------------------------------------------

NUMBER OF      (5)  SOLE VOTING POWER
                    0
SHARES         -----------------------------------------------------------------

BENEFICIALLY   (6)  SHARED VOTING POWER
                    2,381,250
OWNED BY       -----------------------------------------------------------------

EACH           (7)  SOLE DISPOSITIVE POWER
                    0
REPORTING      -----------------------------------------------------------------

PERSON WITH    (8)  SHARED DISPOSITIVE POWER
                    2,381,250
--------------------------------------------------------------------------------
     (9)  AGGREGATE AMOUNT BENEFICIALLY OWNED
          BY EACH REPORTING PERSON
                    2,381,250
--------------------------------------------------------------------------------
    (10)  CHECK BOX IF THE AGGREGATE AMOUNT
          IN ROW (9) EXCLUDES CERTAIN SHARES **                          [ ]
--------------------------------------------------------------------------------
    (11)  PERCENT OF CLASS REPRESENTED
          BY AMOUNT IN ROW (9)
          4.6%
--------------------------------------------------------------------------------
    (12)  TYPE OF REPORTING PERSON **
             PN; IA
--------------------------------------------------------------------------------
                     ** SEE INSTRUCTIONS BEFORE FILLING OUT!





CUSIP No. 16944F101                      13G                  PAGE 6 of 15 PAGES

--------------------------------------------------------------------------------
     (1)  NAME OF REPORTING PERSON
          S.S. OR I.R.S. IDENTIFICATION NO.
          OF ABOVE PERSON
          Ardsley Partners I
--------------------------------------------------------------------------------
     (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
--------------------------------------------------------------------------------

NUMBER OF      (5)  SOLE VOTING POWER
                    0
SHARES         -----------------------------------------------------------------

BENEFICIALLY   (6)  SHARED VOTING POWER
                    2,114,200
OWNED BY       -----------------------------------------------------------------

EACH           (7)  SOLE DISPOSITIVE POWER
                    0
REPORTING      -----------------------------------------------------------------

PERSON WITH    (8)  SHARED DISPOSITIVE POWER
                    2,114,200
--------------------------------------------------------------------------------
     (9)  AGGREGATE AMOUNT BENEFICIALLY OWNED
          BY EACH REPORTING PERSON
                    2,114,200
--------------------------------------------------------------------------------
    (10)  CHECK BOX IF THE AGGREGATE AMOUNT
          IN ROW (9) EXCLUDES CERTAIN SHARES **                          [ ]
--------------------------------------------------------------------------------
    (11)  PERCENT OF CLASS REPRESENTED
          BY AMOUNT IN ROW (9)
          4.1%
--------------------------------------------------------------------------------
    (12)  TYPE OF REPORTING PERSON **
             PN
--------------------------------------------------------------------------------
                     ** SEE INSTRUCTIONS BEFORE FILLING OUT!





CUSIP No. 16944F101                      13G                  PAGE 7 of 15 PAGES

--------------------------------------------------------------------------------
     (1)  NAME OF REPORTING PERSON
          S.S. OR I.R.S. IDENTIFICATION NO.
          OF ABOVE PERSON
          Philip J. Hempleman
--------------------------------------------------------------------------------
     (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
--------------------------------------------------------------------------------

NUMBER OF      (5)  SOLE VOTING POWER
                    0
SHARES         -----------------------------------------------------------------

BENEFICIALLY   (6)  SHARED VOTING POWER
                    3,106,250
OWNED BY       -----------------------------------------------------------------

EACH           (7)  SOLE DISPOSITIVE POWER
                    0
REPORTING      -----------------------------------------------------------------

PERSON WITH    (8)  SHARED DISPOSITIVE POWER
                    3,106,250
--------------------------------------------------------------------------------
     (9)  AGGREGATE AMOUNT BENEFICIALLY OWNED
          BY EACH REPORTING PERSON
                    3,106,250
--------------------------------------------------------------------------------
    (10)  CHECK BOX IF THE AGGREGATE AMOUNT
          IN ROW (9) EXCLUDES CERTAIN SHARES **                          [ ]
--------------------------------------------------------------------------------
    (11)  PERCENT OF CLASS REPRESENTED
          BY AMOUNT IN ROW (9)
          6.4%
--------------------------------------------------------------------------------
    (12)  TYPE OF REPORTING PERSON **
             IN
--------------------------------------------------------------------------------
                     ** SEE INSTRUCTIONS BEFORE FILLING OUT!





CUSIP No. 16944F101                       13G                PAGE 8 of 15 PAGES

ITEM 1(a).  NAME OF ISSUER:

            The name of the issuer is China Information Security Technology,
Inc. (the "Company").

ITEM 1(b).  ADDRESS OF ISSUER'S PRINCIPAL EXECUTIVE OFFICES:
            21st Floor, Everbright Bank Building, Zhuzilin, Futian District,
            Shenzhen, Guangdong, 518040,  People's Republic of China

ITEM 2(a).  NAME OF PERSON FILING:

         This statement is filed by:

         (i)      Ardsley Partners Fund II, L.P., a Delaware limited partnership
                  ("AP II"), with respect to the shares of Common Stock, par
                  value $0.01 per share ("Common Stock") directly owned by it;
         (ii)     Ardsley Partners Institutional Fund, L.P., a Delaware limited
                  partnership ("Ardsley Institutional"), with respect to the
                  shares of Common Stock directly owned by it;
         (iii)    Ardsley Offshore Fund, Ltd., a British Virgin Islands
                  corporation ("Ardsley Offshore"), with respect to the shares
                  of Common Stock directly owned by it;
         (iv)     Ardsley Advisory Partners, a New York general partnership
                  ("Ardsley") which serves as Investment Manager of Ardsley
                  Offshore and as Investment Adviser of AP II and Ardsley
                  Institutional with respect to the shares of Common Stock
                  directly owned by Ardsley Offshore, AP II and Ardsley
                  Institutional;
         (v)      Ardsley Partners I, a New York general partnership ("Ardsley
                  Partners") which serves as General Partner of AP II and
                  Ardsley Institutional; and
         (vi)     Philip J. Hempleman ("Mr. Hempleman"), the Managing Partner of
                  Ardsley and Ardsley Partners, with respect to the shares of
                  Common Stock owned by AP II, Ardsley Institutional, Ardsley
                  Offshore and with respect to the shares of Common Stock owned
                  by certain managed accounts managed by him directly.

         The foregoing persons are hereinafter sometimes collectively referred
         to as the "Reporting Persons." Any disclosures herein with respect to
         persons other than the Reporting Persons are made on information and
         belief after making inquiry to the appropriate party.

ITEM 2(b).  ADDRESS OF PRINCIPAL OFFICE OR, IF NONE, RESIDENCE:

         The address of the business office of each of the Reporting Persons,
with the exception of Ardsley Offshore, is 262 Harbor Drive, Stamford,
Connecticut 06902.

         The address of the registered office of Ardsley Offshore is Romasco
Place, Wickhams Cay 1, Roadtown Tortola, British Virgin Islands.





CUSIP No. 16944F101                       13G                PAGE 9 of 15 PAGES

ITEM 2(c).  CITIZENSHIP:

         AP  II  and  Ardsley  Institutional  are  Delaware  limited
partnerships. Ardsley Offshore is a British Virgin Islands corporation. Ardsley
and Ardsley Partners are New York general partnerships. Mr. Hempleman is a
United States Citizen.

ITEM 2(d).  TITLE OF CLASS OF SECURITIES: Common Stock, par value $0.01 per
share

ITEM 2(e).  CUSIP NUMBER:  16944F101

ITEM 3. IF THIS STATEMENT IS FILED PURSUANT TO RULES 13d-1(b), OR 13d-2(b),
CHECK WHETHER THE PERSON FILING IS A:

          (a)[ ] Broker or dealer registered under Section 15 of the Act

          (b)[ ] Bank as defined in Section 3(a)(6) of the Act


          (c)[ ] Insurance Company as defined in Section 3(a)(19) of the
                 Act

          (d)[ ] Investment Company registered under Section 8 of the
                 Investment Company Act

          (e)[ ] Investment Adviser registered under Section 203 of the
                 Investment Advisers Act of 1940

          (f)[ ] Employee Benefit Plan, Pension Fund which is subject to
                 the provisions of the Employee Retirement Income Security
                 Act of 1974 or Endowment Fund; see Rule 13d- 1(b)(1)(ii)(F)

          (g)[ ] Parent Holding Company, in accordance with Rule 13d-
                 1(b)(ii)(G); see item 7

          (h)[ ] Group, in accordance with Rule 13d-1(b)(1)(ii)(H)

If this statement is filed pursuant to Rule 13d-1(c), check the box. [X]





CUSIP No. 16944F101                      13G                PAGE 10 of 15 PAGES

ITEM 4.   OWNERSHIP.

      A.  Ardsley Partners Fund II, L.P.
          (a) Amount beneficially owned:  1,188,850
          (b) Percent of class: 2.4%. (The percentages used herein and in the
              rest of Item 4 are calculated based upon the 402,577,990 shares
              of Common Stock issued and outstanding as of November 17 2009,
              as communicated to the Reporting Persons by the Company via
              email on November 20, 2009.)
          (c) (i) Sole Power to vote or direct the vote: -0-
             (ii) Shared power to vote or direct the vote: 1,188,850
            (iii) Sole power to dispose or direct the disposition: -0-
             (iv) Shared power to dispose or direct the disposition: 1,188,850

      B.  Ardsley Partners Institutional Fund, L.P.
          (a) Amount beneficially owned: 925,350
          (b) Percent of class: 1.9%
          (c) (i) Sole Power to vote or direct the vote: -0-
             (ii) Shared power to vote or direct the vote: 925,350
            (iii) Sole power to dispose or direct the disposition: -0-
             (iv) Shared power to dispose or direct the disposition: 925,350

      C.  Ardsley Offshore Fund, Ltd.
          (a) Amount beneficially owned: 229,100
          (b) Percent of class: 0.5%
          (c) (i) Sole Power to vote or direct the vote: -0-
             (ii) Shared power to vote or direct the vote: 229,100
            (iii) Sole power to dispose or direct the disposition: -0-
             (iv) Shared power to dispose or direct the disposition: 229,100


      D.  Ardsley Advisory Partners
          (a) Amount beneficially owned: 2,381,250
          (b) Percent of class: 4.6%
          (c) (i) Sole Power to vote or direct the vote: -0-
             (ii) Shared power to vote or direct the vote: 2,381,250
            (iii) Sole power to dispose or direct the disposition: -0-
             (iv) Shared power to dispose or direct the disposition: 2,381,250

      E.  Ardsley Partners I
          (a) Amount beneficially owned: 2,114,200
          (b) Percent of class: 4.1%
          (c) (i) Sole Power to vote or direct the vote: -0-
             (ii) Shared power to vote or direct the vote: 2,114,200
            (iii) Sole power to dispose or direct the disposition: -0-
             (iv) Shared power to dispose or direct the disposition: 2,114,200

      F. Philip J. Hempleman
          (a) Amount beneficially owned: 3,106,250
          (b) Percent of class: 6.4%
          (c) (i) Sole Power to vote or direct the vote: -0-
             (ii) Shared power to vote or direct the vote: 3,106,250
            (iii) Sole power to dispose or direct the disposition: -0-
             (iv) Shared power to dispose or direct the disposition: 3,106,250





CUSIP No. 16944F101                      13G                PAGE 11 of 15 PAGES




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.

         Ardsley, the Investment Manager of Ardsley Offshore, has the power to
vote and direct the disposition of the proceeds from the sale of the shares of
Common Stock owned by Ardsley Offshore and accordingly may be deemed the direct
"beneficial owner" of such shares of Common Stock.

         Ardsley, the Investment Adviser of AP II, Ardsley Institutional, shares
the power to vote and direct the disposition of the proceeds from the sale of
the shares of Common Stock owned by AP II and Ardsley Institutional and,
accordingly, may be deemed the direct "beneficial owner" of such shares of
Common Stock.

         Ardsley Partners, the General Partner of AP II and Ardsley
Institutional, shares the power to vote and direct the disposition of the shares
of Common Stock owned by AP II and Ardsley Institutional and, accordingly, may
be deemed the direct "beneficial owner" of such shares of Common Stock.

         Mr. Hempleman is the Managing Partner of Ardsley and Ardsley Partners
and in that capacity directs their operations and therefore may be deemed to be
the indirect "beneficial owner" of the shares of Common Stock owned by Ardsley
Offshore, AP II, Ardsley Institutional and also directly manages certain managed
accounts. Mr. Hempleman disclaims beneficial ownership of all of the shares of
Common Stock reported in this 13G.

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.

     Each of the Reporting Persons hereby makes the following certification:

          By signing below I certify, to the best of my knowledge and belief,
the securities referred to above were acquired in the ordinary course of
business, were not acquired for the purpose of and do not have the effect of
changing or influencing the control of the issuer of such securities and were
not acquired in connection with or as a participant in any transaction having
such purposes or effect.






CUSIP No. 16944F101                      13G                PAGE 12 of 15 PAGES

                                    SIGNATURE

          After reasonable inquiry and to the best of their knowledge and
belief, the undersigned certify that the information set forth in this statement
is true, complete and correct.


DATED:   as of January 19, 2010


                                      ARDSLEY PARTNERS FUND II, L.P.
                                      BY:  ARDSLEY PARTNERS I,
                                           GENERAL PARTNER


                                      BY:/s/ Steve Napoli
                                         ---------------------------
                                          Steve Napoli
                                          General Partner


                                      ARDSLEY PARTNERS INSTITUTIONAL FUND, L.P.
                                      BY:  ARDSLEY PARTNERS I,
                                           GENERAL PARTNER


                                      BY:/s/ Steve Napoli
                                         ---------------------------
                                          Steve Napoli
                                          General Partner


                                      ARDSLEY OFFSHORE FUND, LTD.


                                      BY:/s/ Steve Napoli
                                         ---------------------------
                                          Steve Napoli
                                          Director





CUSIP No. 16944F101                      13G                PAGE 13 of 15 PAGES

                                      ARDSLEY ADVISORY PARTNERS
                                      By:  ARDSLEY PARTNERS I
                                           GENERAL PARTNER


                                      BY:/s/ Steve Napoli
                                         ---------------------------
                                          Steve Napoli
                                          General Partner


                                      ARDSLEY PARTNERS I

                                      BY:/s/ Steve Napoli
                                         ---------------------------
                                          Steve Napoli
                                          General Partner



                                      PHILIP J. HEMPLEMAN, INDIVIDUALLY


                                      BY:/s/ Steve Napoli*
                                         ---------------------------
                                          Steve Napoli
                                       As attorney in fact for
                                       Philip J. Hempleman


*    Evidence of Power of Attorney was filed with the Schedule 13G/A filed on
     February 15, 2006 (Acc-no: 0000902664-06-000895) and is incorporated by
     reference into this filing.





CUSIP No. 16944F101                      13G                PAGE 14 of 15 PAGES


                                    EXHIBIT 1
               JOINT FILING AGREEMENT PURSUANT TO RULE 13d-1(k)(1)

          The undersigned acknowledge and agree that the foregoing statement on
Schedule 13G is filed on behalf of each of the undersigned and that all
subsequent amendments to this statement shall be filed on behalf of each of the
undersigned without the necessity of filing additional joint filing statements.
The undersigned acknowledge that each shall be responsible for the timely filing
of such amendments, and for the completeness and accuracy of the information
concerning him, her or it contained herein, but shall not be responsible for the
completeness and accuracy of the information concerning the other entities or
persons, except to the extent that he, she or it knows or has reason to believe
that such information is inaccurate.

DATED:   as of January 19, 2010


                                      ARDSLEY PARTNERS FUND II, L.P.
                                      BY:  ARDSLEY PARTNERS I,
                                           GENERAL PARTNER


                                      BY:/s/ Steve Napoli
                                         ---------------------------
                                          Steve Napoli
                                          General Partner


                                      ARDSLEY PARTNERS INSTITUTIONAL FUND, L.P.
                                      BY:  ARDSLEY PARTNERS I,
                                           GENERAL PARTNER


                                      BY:/s/ Steve Napoli
                                         ---------------------------
                                          Steve Napoli
                                          General Partner


                                      ARDSLEY OFFSHORE FUND, LTD.


                                      BY:/s/ Steve Napoli
                                         ---------------------------
                                          Steve Napoli
                                          Director





CUSIP No. 16944F101                      13G                PAGE 15 of 15 PAGES


                                      ARDSLEY ADVISORY PARTNERS
                                      By:  ARDSLEY PARTNERS I
                                           GENERAL PARTNER


                                      BY:/s/ Steve Napoli
                                         ---------------------------
                                          Steve Napoli
                                          General Partner


                                      ARDSLEY PARTNERS I

                                      BY:/s/ Steve Napoli
                                         ---------------------------
                                          Steve Napoli
                                          General Partner



                                      PHILIP J. HEMPLEMAN, INDIVIDUALLY


                                      BY:/s/ Steve Napoli*
                                         ---------------------------
                                          Steve Napoli
                                       As attorney in fact for
                                       Philip J. Hempleman