Exhibit 4(a) FORM OF STOCK CERTIFICATE NUMBER DUSA PHARMACEUTICALS, INC. SHARES Incorporated under the laws of the State DUSA_________ of New Jersey ________ See reverse for Certain Definitions CUSIP 266898 10 5 THIS CERTIFIES THAT is the owner of FULLY PAID AND NON-ASSESSABLE SHARES OF THE COMMON STOCK, NO PAR VALUE, OF DUSA Pharmaceuticals, Inc., (hereinafter called the "Corporation"), transferable only on the books of the Corporation by the holder hereof in person or by duly authorized attorney upon surrender of this certificate properly endorsed. This certificate is not valid until countersigned and registered by the transfer agent and registrar of the Corporation. The shares represented by this certificate are transferable at the corporate offices of American Stock Transfer & Trust Company in New York, New York or at the corporate offices of Montreal Trust Company of Canada in Toronto, Ontario. IN WITNESS WHEREOF, the facsimile seal of the Corporation and the facsimile signatures of its duly authorized officers. Dated: Countersigned and Registered COUNTERSIGNED AND Registered [Seal] President AMERICAN STOCK TRANSFER MONTREAL TRUST COMPANY & TRUST COMPANY OF CANADA OR Authorized Signature Authorized Signature Secretary [REVERSE SIDE OF CERTIFICATE] DUSA PHARMACEUTICALS, INC. The following abbreviations, when used in the inscription on the face of this certificate, shall be construed as though they were written out in full according to applicable laws or regulations. TEN COM - as tenants in common TEN ENT - as tenants by the entireties JT TEN - as joint tenants with rights of survivorship and not as tenants in common UNIF GIFT MIN ACT - ____________________ Custodian________________________ (Cust) (Minor) under Uniform Gifts to Minors Act_____________________ (State) FOR VALUE RECEIVED, __________ HEREBY SELL, ASSIGN AND TERANSFER UNTO: Please insert social security, social insurance or taxpayer identification number of assignee ========================= ========================= ________________________________________________________________________________ Please print or typewrite Name and Address of Assignee ________________________________________________________________________________ ______________________________________________________________SHARES REPRESENTED BY THE WITHIN CERTIFICATE, AND DO HEREBY IRREVOCABLY CONSITUTE AND APPOINT ________________________________________________________________________ATTORNEY TO TRANSFER THE SAID SHARES ON THE BOOKS OF THE WITHIN-NAMED CORPORATION WITH FULL POWER OF SUBSTITUTION IN THE PREMISES. Dated:____________________________ X__________________________________ (Signature) ___________________________________ (Please Print Name) __________________________________ ___________________________________ Signature Guaranteed (Address) ___________________________________ Social Security, Spcial Insurance or Taxpayer Identification Number THE SIGNATURE OF THIS ASSIGNMENT MUST CORRESPOND WITH THE NAME AS WRITTEN UPON THE FACE OF THIS COMMON STOCK CERTIFICATE IN VERY PARTICULAR, WITHOUT ALTERATION OR ENLARGEMENT OR ANY CHANGE WHATSOEVER, AND MUST BE GUARANTEED BY A COMMERCIAL BANK OR TRUST COMPANY OR A MEMBER FIRM OF THE AMERICAN STOCK EXCHANGE, NEW YORK STOCK EXCHANGE, PACIFIC STOCK EXCHANGE, MIDWEST STOCK EXCHANGE, OR TORONTO STOCK EXCHANGE. This certificate also evidences and entitles the holder hereof to certain Rights as set forth in the Rights Agreement between DUSA Pharmaceuticals, Inc. (the "Company") and American Stock Transfer & Trust Company (the "Rights Agent") dated as of September 27, 2002 (the "Rights Agreement"), the terms of which are hereby incorporated herein by reference and a copy of which is on file at the principal offices of the Company. Under certain circumstances, as set forth in the Rights Agreement, such Rights will be evidenced by separate certificates and will no longer be evidenced by this certificate. The Company will mail to the holder of this certificate a copy of the Rights Agreement, as in effect on the date of mailing, without charge promptly after receipt of a written request therefor. Under certain circumstances set forth in the Rights Agreement, Rights issued to, or held by, any Person who is, was or becomes an Acquiring Person, an Adverse Person or any Affiliate or Associate of an Acquiring Person or an Adverse Person (as such terms are defined in the Rights Agreement), whether currently held by or on behalf of such Person or by any subsequent holder may become null and void. The Rights shall not be exercisable, and shall be void so long as held, by a holder in any jurisdiction where the requisite qualification to the issuance to such holder, or the exercise by such holder, of the Rights in such jurisdiction shall not have been obtained or be obtainable. AMERICAN BANKNOTE COMPANY PRODUCTION COORDINATOR SUE MCNAMEE 215-830-2158 680 Blair Mill Road PROOF OF OCTOBER 22, 1997 Horsham, PA 19044 DUSA 215-657-3480 H 53296PATCH ___________________________________________ ________________________________________________ SALESPERSON R. JOHNSON 212-557-9100 Opr. JH NEW ___________________________________________ ________________________________________________ /home/jm/inprogress/home11/DUSA53296 /net/banknote/home/11/D