Ronald Len Zimmerly Jr. - 14 Jan 2026 Form 4 Insider Report for MIDDLEFIELD BANC CORP (MBCN)

Role: Chief Executive Officer, Director
Signature: /s/ Ronald L. Zimmerly, Jr. by Julie E. Shaw Power of Attorney
Issuer symbol: MBCN
Transactions as of: 14 Jan 2026
Net transactions value: +$52,785
Form type: 4
Filing time: 16 Jan 2026, 10:31:18 UTC
Previous filing: 18 Dec 2025
Next filing: 25 Feb 2026
SEC: View on sec.gov

Reporting Owners (1)

Name	Relationship	Address	Signature	Signature date	CIK
Zimmerly Ronald Len Jr.	Chief Executive Officer, Director	15985 EAST HIGH STREET, MIDDLEFIELD	/s/ Ronald L. Zimmerly, Jr. by Julie E. Shaw Power of Attorney	16 Jan 2026	0001954793

Transactions Table

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Ownership	Footnotes
transaction	MBCN	Common Stock	Award	$78,936	+2,288	+4.7%	$34.50	51,492	14 Jan 2026	Direct	F1, F2
transaction	MBCN	Common Stock	Tax liability	$26,151	-758	-1.5%	$34.50	50,734	14 Jan 2026	Direct	F2
holding	MBCN	Common Stock						8,786	14 Jan 2026	Held in IRA

Derivative Securities (e.g., puts, calls, warrants, options, convertible securities)

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Underlying Class	Amount	Exercise Price	Ownership	Footnotes
holding	MBCN	Conditional Stock Award						4,520	14 Jan 2026	Common Stock	4,520		Direct	F3, F5
holding	MBCN	Conditional Stock Award						4,576	14 Jan 2026	Common Stock	4,576		Direct	F4, F5

* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Explanation of Responses:

Id	Content
F1	The acquisition represents the vesting of restricted stock granted to the reporting person on January 14, 2025. The shares vested on the first anniversary of the grant.
F2	Includes shares acquired under MBCN Dividend Reinvestment Plan
F3	The award represents a grant of restricted stock which vests ratably over a three-year period provided that Mr. Zimmerly remains continuously employed by Middlefield as of each vesting date. Until the award vests, the award confers no right to vote, no right to dividends, and no other shareholder rights to the recipient. The details of the vesting conditions may be found in a Form 8K filing dated September 4, 2024.
F4	The award represents a grant of restricted stock which vests ratably over a three-year period provided that Mr. Zimmerly remains continuously employed by Middlefield as of each vesting date. Until the award vests, the award confers no right to vote, no right to dividends, and no other shareholder rights to the recipient. The details of the vesting conditions may be found in a Form 8K filing dated January 17, 2025.
F5	Each restricted stock unit represents the right to receive, at settlement, one share of common stock.