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
                                                                                  
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OMB Number: 3235-0287
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Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934 or Section 30(h) of the Investment Company Act of 1940
                      

1. Name and Address of Reporting Person *

Brog Timothy 		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
__ X __ Officer (give title below)      _____ Other (specify below)
President and CEO
(Last)          (First)          (Middle)

C/O RUBICON TECHNOLOGY, INC.,, 900 EAST GREEN ST., UNIT A 		3. Date of Earliest Transaction (MM/DD/YYYY)

5/12/2017
(Street)

BENSENVILLE, IL 60106
(City)        (State)        (Zip)
4. If Amendment, Date Original Filed (MM/DD/YYYY)

 
6. Individual or Joint/Group Filing (Check Applicable Line)

_ X _ Form filed by One Reporting Person
___ Form filed by More than One Reporting Person

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1.Title of Security
(Instr. 3) 		2. Trans. Date 2A. Deemed Execution Date, if any 3. Trans. 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

Table II - Derivative Securities Beneficially Owned ( e.g. , puts, calls, warrants, options, convertible securities)
1. Title of Derivate Security
(Instr. 3) 		2. Conversion or Exercise Price of Derivative Security 3. Trans. Date 3A. Deemed Execution Date, if any 4. Trans. 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 7. Title and Amount of Securities Underlying Derivative Security
(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
Restricted Stock Units     (1) (2) 5/12/2017     J   (3)       30902      (4) 3/15/2021   Common Stock   30902     (3) 29098   D    

Explanation of Responses:
(1)  Each restricted stock unit ("RSU") represents or represented a contingent right to receive one share of the Company's common stock.
(2)  Pursuant to their terms, the RSUs set forth herein were automatically adjusted in connection with the 1-for-10 reverse stock split of the Company's common stock which occurred on May 5, 2017.
(3)  30,902 RSUs were canceled and rescinded pursuant to the terms of the Amended and Restated Executive Employment Agreement, dated May 12, 2017, between Mr. Brog and the Company (the "Agreement").
(4)  902, 15,000 and 15,000 of such RSUs would have vested if prior to March 15, 2021 the 15-trading day average closing price of the Company's common stock was greater than or equal to the target prices of $11.00, $12.50 and $14.00, respectively.

Reporting Owners
Reporting Owner Name / Address
Relationships
Director 10% Owner Officer Other
Brog Timothy
C/O RUBICON TECHNOLOGY, INC.,
900 EAST GREEN ST., UNIT A
BENSENVILLE, IL 60106 		X
President and CEO

Signatures
/s/ Timothy E. Brog 5/15/2017
** Signature of Reporting Person Date


Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* 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).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB control number.
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