Ownership Submission
FORM 4
Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).
UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN 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 *
MIKOLAJCZYK MICHAEL E
  2. Issuer Name and Ticker or Trading Symbol
Rubicon Technology, Inc. [RBCN]
5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)
__X__ Director _____ 10% Owner
_____ Officer (give title below) _____ Other (specify below)
(Last)
(First)
(Middle)
C/O RUBICON TECHNOLOGY INC., 9931 FRANKLIN AVENUE
3. Date of Earliest Transaction (Month/Day/Year)
11/21/2007
(Street)

FRANKLIN PARK, IL 60131
4. If Amendment, Date Original Filed(Month/Day/Year)
6. Individual or Joint/Group Filing(Check Applicable Line)
_X_ Form filed by One Reporting Person
___ Form filed by More than One Reporting Person
(City)
(State)
(Zip)
Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1.Title of Security
(Instr. 3)
2. Transaction Date (Month/Day/Year) 2A. Deemed Execution Date, if any (Month/Day/Year) 3. Transaction Code
(Instr. 8)
4. Securities Acquired (A) or Disposed of (D)
(Instr. 3, 4 and 5)
5. Amount of Securities Beneficially Owned Following Reported Transaction(s)
(Instr. 3 and 4)
6. Ownership Form: Direct (D) or Indirect (I)
(Instr. 4)
7. Nature of Indirect Beneficial Ownership
(Instr. 4)
Code V Amount (A) or (D) Price
Common Stock 11/21/2007   C   13,618 A (1) 13,618 D  
Common Stock 11/21/2007   C   26,345 A (1) 39,963 D  
Common Stock 11/21/2007   C   9,438 A (1) 49,401 D  
Common Stock 11/21/2007   C   11,766 A (1) 61,185 D  
Common Stock 11/21/2007   A   7,142 A $ 0 68,327 D  
Common Stock 11/21/2007   A   14,200 A $ 14 82,527 D  
Common Stock 11/21/2007   A   700 A $ 14 83,227 I (2) By son Mark Mikolajczyk

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Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned
(e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security
(Instr. 3)
2. Conversion or Exercise Price of Derivative Security 3. Transaction Date (Month/Day/Year) 3A. Deemed Execution Date, if any (Month/Day/Year) 4. Transaction Code
(Instr. 8)
5. Number of Derivative Securities Acquired (A) or Disposed of (D)
(Instr. 3, 4, and 5)
6. Date Exercisable and Expiration Date
(Month/Day/Year)
7. Title and Amount of Underlying Securities
(Instr. 3 and 4)
8. Price of Derivative Security
(Instr. 5)
9. Number of Derivative Securities Beneficially Owned Following Reported Transaction(s)
(Instr. 4)
10. Ownership Form of Derivative Security: Direct (D) or Indirect (I)
(Instr. 4)
11. Nature of Indirect Beneficial Ownership
(Instr. 4)
Code V (A) (D) Date Exercisable Expiration Date Title Amount or Number of Shares
Series A Convertible Preferred (1) 11/21/2007   C     18,802   (1)   (1) Common Stock 13,618 $ 0 0 D  
Series C-2 Convertible Preferred (1) 11/21/2007   C     189,953   (1)   (1) Common Stock 26,345 $ 0 0 D  
Series D-2 Convertible Preferred (1) 11/21/2007   C     60,153   (1)   (1) Common Stock 9,438 $ 0 0 D  
Series E Convertible Preferred (1) 11/21/2007   C     130,285   (1)   (1) Common Stock 11,766 $ 0 0 D  

Reporting Owners

Reporting Owner Name / Address Relationships
 Director  10% Owner  Officer  Other
MIKOLAJCZYK MICHAEL E
C/O RUBICON TECHNOLOGY INC.
9931 FRANKLIN AVENUE
FRANKLIN PARK, IL 60131
  X      

Signatures

 /s/ Scott Glickson, attorney-in-fact   11/26/2007
**Signature of Reporting Person Date

Explanation of Responses:

* If the form is filed by more than one reporting person, see Instruction 4(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).
(1) The preferred stock is immediately convertible. Each share of preferred stock converted automatically into common stock upon the closing of the issuer's initial public offering according to the following ratios: each Series A Convertible Preferred Share on a one-to-0.5536 ratio, each Series C-2 Convertible Preferred Share on a one-to-0.1009 ratio, each Series D-2 Convertible Preferred Share on a one-to-0.1256 ratio, and each Series E Convertible Preferred on a one-to-0.0769 ratio. Amounts shown include shares of common stock issuable upon such conversion in exchange for accrued dividends on the preferred stock at the following rates: Series A at $9.6083 per share, Series C-2 at $7.5595 per share, Series D-2 at $6.6690 per share, and Series E at $3.6478 per share.
(2) Consists of shares of Common Stock held by the Reporting Person's son, Mark Mikolajczyk. The Reporting Person disclaims beneficial ownership of these shares.

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