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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