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 *

CALDWELL THOMAS G
2. Issuer Name and Ticker or Trading Symbol

MIDDLEFIELD BANC CORP [ MBCN ]
5. Relationship of Reporting Person(s) to Issuer (Check all applicable)

__X__ Director                    _____ 10% Owner
__X__ Officer (give title below)    _____ Other (specify below)
President/Chief Executive Offi
(Last)          (First)          (Middle)

15985 EAST HIGH STREET, P. O. BOX 35
3. Date of Earliest Transaction (MM/DD/YYYY)

1/2/2020
(Street)

MIDDLEFIELD, OH 44062
(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 1/2/2020  A  367 (1)A$26.09 10689 (2)D  
Common Stock         28444 (2)D (3) 
Common Stock         509.018 (2)(4)I custodian for children 

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 Security3. Trans. Date3A. Deemed Execution Date, if any4. 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 Date7. 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)
CodeV(A)(D)Date ExercisableExpiration DateTitleAmount or Number of Shares
Stock Option (right to buy) $8.775 (5)          5/9/2012 5/9/2021 Common Stock 5000 (5) 5000 (5)D  
Conditioanl Stock Award (6)$19.3496 (5)           (6)7/20/2020 Common Stock 1506 (5) 1506 (5)D  
Conditional Stock Award (7)$24.10 (5)           (7)5/22/2021 Common Stock 4480 (5) 4480 (5)D  
Conditional Stock Award (8)$21.215 (5)           (8)3/1/2022 Common Stock 5396 (5) 5396 (5)D  

Explanation of Responses:
(1) Shares acquired under Director Compensation program for members of the Board of Directors of The Middlefield Banking Company.
(2) The number of shares have been adjusted to reflect the 2-for-1 stock split effected as of November 8, 2019.
(3) Shares held jointly with spouse.
(4) Includes shares acquired under the MBCN Dividend Reinvestment Plan.
(5) The number of shares and the exercise price have been adjusted to reflect the 2-for-1 stock split effected as of November 8, 2019.
(6) Until the award vests, the award confers no right to vote, no right to dividends, and no other shareholder rights to the recipient. Vesting is subject to a time-based or service condition and a performance-based condition. The details of the vesting conditions may be found in a Form 8-K filing dated July 20, 2017.
(7) Until the award vests, the award confers no right to vote, no right to dividends, and no other shareholder rights to the recipient. Vesting is subject to a time-based or service condition and a performance-based condition. The details of the vesting conditions may be found in a Form 8-K filing dated May 29, 2018.
(8) Until the award vests, the award confers no right to vote, no right to dividends, and no other shareholder rights to the recipient. Vesting is subject to a time-based or service condition and a performance-based condition. The details of the vesting conditions may be found in a Form 8-K filing dated March 5, 2019.

Reporting Owners
Reporting Owner Name / Address
Relationships
Director10% OwnerOfficerOther
CALDWELL THOMAS G
15985 EAST HIGH STREET
P. O. BOX 35
MIDDLEFIELD, OH 44062
X
President/Chief Executive Offi

Signatures
Thomas G. Caldwell by James R. Heslop, II Power of Attorney1/3/2020
**Signature of Reporting PersonDate

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