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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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 STREET, UNIT A
3. Date of Earliest Transaction (MM/DD/YYYY)
10/19/2020
(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
Common Stock  10/19/2020    M    17280 (1) A $0  92280  D   
Common Stock  10/19/2020    F    5280 (2) D $8.50  87000  D   

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

Explanation of Responses:
(1)  On October 19, 2020, Mr. Brog was granted 17,280 shares of Rubicon Technology, Inc. restricted common stock as part of his 2019 Objective Bonus.
(2)  As permitted under the Company's 2016 Equity Incentive Plan, on October 20, 2020, the Company withheld 5,280 shares of common stock from the reporting person to pay certain FICA, Medicare, Income Withholding and other taxes in connection with the granting of the restricted common stock.

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

Signatures
/s/ Timothy E. Brog 10/20/2020
**Signature of Reporting Person Date