Ownership Submission
FORM 3
 UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

INITIAL STATEMENT OF BENEFICIAL OWNERSHIP OF SECURITIES

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940
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(Print or Type Responses)
1. Name and Address of Reporting Person *
  Cross Atlantic Capital Partners, Inc.
 2. Date of Event Requiring Statement (Month/Day/Year)
11/15/2007		 3. Issuer Name and Ticker or Trading Symbol
Rubicon Technology, Inc. [RBCN]
(Last)
(First)
(Middle)
FIVE RADNOR CORPORATE CENTER, SUITE 555, 100 MATSONFORD ROAD		 4. Relationship of Reporting Person(s) to Issuer
(Check all applicable)
_____ Director __X__ 10% Owner
_____ Officer (give title below) _____ Other (specify below)
5. If Amendment, Date Original Filed(Month/Day/Year)
11/15/2007
(Street)

RADNOR, PA 19087		 6. Individual or Joint/Group Filing(Check Applicable Line)
___ Form filed by One Reporting Person
_X_ Form filed by More than One Reporting Person
(City)
(State)
(Zip)
Table I - Non-Derivative Securities Beneficially Owned
1.Title of Security
(Instr. 4)		 2. Amount of Securities Beneficially Owned
(Instr. 4)		 3. Ownership Form: Direct (D) or Indirect (I)
(Instr. 5)		 4. Nature of Indirect Beneficial Ownership
(Instr. 5)

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly. SEC 1473 (7-02)
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Table II - Derivative Securities Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security
(Instr. 4)		 2. Date Exercisable and Expiration Date
(Month/Day/Year)		 3. Title and Amount of Securities Underlying Derivative Security
(Instr. 4)		 4. Conversion or Exercise Price of Derivative Security 5. Ownership Form of Derivative Security: Direct (D) or Indirect (I)
(Instr. 5)		 6. Nature of Indirect Beneficial Ownership
(Instr. 5)
Date Exercisable Expiration Date Title Amount or Number of Shares

Reporting Owners

Reporting Owner Name / Address Relationships
Director 10% Owner Officer Other
Cross Atlantic Capital Partners, Inc.
FIVE RADNOR CORPORATE CENTER, SUITE 555
100 MATSONFORD ROAD
RADNOR, PA 19087		     X    
CROSS ATLANTIC TECHNOLOGY FUND L P
FIVE RADNOR CORPORATE CENTER, SUITE 555
100 MATSONFORD ROAD
RADNOR, PA 19087		     X    
XATF Management, L.P.
FIVE RADNOR CORPORATE CENTER, SUITE 555
100 MATSONFORD ROAD
RADNOR, PA 19087		     X    
CROSS ATLANTIC TECHNOLOGY FUND II LP
FIVE RADNOR CORPORATE CENTER, SUITE 555
100 MATSONFORD ROAD
RADNOR, PA 19087		     X    
XATF MANAGEMENT II LP
FIVE RADNOR CORPORATE CENTER, SUITE 555
100 MATSONFORD ROAD
RADNOR, PA 19087		     X    
CROSS ATLANTIC CAPITAL PARTNERS II INC
FIVE RADNOR CORPORATE CENTER, SUITE 555
100 MATSONFORD ROAD
RADNOR, PA 19087		     X    
CO INVESTMENT 2000 FUND LP
FIVE RADNOR CORPORATE CENTER, SUITE 555
100 MATSONFORD ROAD
RADNOR, PA 19087		     X    
Co-Invest Management LP
FIVE RADNOR CORPORATE CENTER, SUITE 555
100 MATSONFORD ROAD
RADNOR, PA 19087		     X    
Co-Invest Capital Partners Inc
FIVE RADNOR CORPORATE CENTER, SUITE 555
100 MATSONFORD ROAD
RADNOR, PA 19087		     X    

Signatures

/s/ Scott Glickson, attorney-in-fact 03/21/2008
**Signature of Reporting Person Date

Explanation of Responses:

No securities are beneficially owned

* If the form is filed by more than one reporting person, see Instruction 5(b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations. See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
 
Remarks:
On November 15, 2007, the reporting persons filed an initial statement of beneficial ownership on Form 3 with respect to shares of common stock of the issuer (the "Original Form 3").  On November 26, 2007 the reporting persons filed a statement of changes in beneficial ownership on Form 4 with respect to shares of common stock of the issuer (the "Form 4"). This amendment is being filed solely for the purpose of adding Cross Atlantic Technology Fund, L.P., The Co-Investment 2000 Fund L.P., Co-Invest Management, L.P. and Co-Invest Capital Partners, Inc. as additional joint filers on the Original Form 3 and adding Co-Investment 2000 Fund L.P., Co-Invest Management, L.P. and Co-Invest Capital Partners, Inc. as additional joint filers on the Form 4.  Except as otherwise stated in this remark, this amendment does not alter any of the other information reported in the Original Form 3 or the Form 4. By signing below and filing this amendment, Cross Atlantic Technology Fund, L.P., The Co-Investment 2000 Fund L.P., Co-Invest Management, L.P. and Co-Invest Capital Partners, Inc. are deemed to have executed and filed the aforementioned reports.

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