[SCHEDULE 13G] Middlefield Banc Corp. SEC Filing

Rhea-AI Filing Summary

The Vanguard Group filed Amendment No. 12 to Schedule 13G for Myriad Genetics, Inc. (MYGN) covering the period ended 30 Jun 2025.

• Beneficial ownership: 9,257,493 common shares, representing 10.04 % of outstanding stock.
• Voting power: 0 shares sole; 145,939 shares shared.
• Dispositive power: 9,003,551 shares sole; 253,942 shares shared.
• Filed under Rule 13d-1(b) as an investment adviser (IA); the holding is reported as passive and in the ordinary course of business.
• Crossing the 10 % threshold designates Vanguard as a 10 % beneficial owner, increasing disclosure and potential Section 16 obligations.

The filing signals continued, sizable institutional ownership but does not indicate any intent to influence control. Certification signed by Ashley Grim, Head of Global Fund Administration, on 29 Jul 2025.

Positive

• Vanguard’s 10.04 % position confirms strong institutional support and may improve share liquidity and market perception.

Negative

• None.

Insights

Portfolio Manager

TL;DR: Vanguard now owns 10 % of MYGN, signalling index-level support; passive stake limits governance impact.

Vanguard’s 9.26 M-share position pushes it just over the 10 % mark, indicating steady accumulation or share count changes. As a passive investment adviser, Vanguard is unlikely to press for strategic change, but its ownership can bolster liquidity and reduce free-float volatility. Section 16 reporting may now apply, which modestly raises transparency. From an investor’s view, large-scale passive backing is mildly constructive but not a catalyst.

Corporate Governance Analyst

TL;DR: Passive 10 % stake adds oversight visibility yet no activist intent.

Reaching the statutory 10 % threshold subjects Vanguard to additional short-swing profit and insider reporting rules, enhancing governance scrutiny. However, zero sole voting power underscores its purely custodial role: voting decisions are largely client-directed. Therefore, governance influence remains limited. Overall impact is neutral-to-positive for perception, with negligible strategic implications.

SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

SCHEDULE 13G

UNDER THE SECURITIES EXCHANGE ACT OF 1934

Middlefield Banc Corp

(Name of Issuer)

Common Stock

(Title of Class of Securities)

596304204

(CUSIP Number)

06/30/2025

(Date of Event Which Requires Filing of this Statement)

Check the appropriate box to designate the rule pursuant to which this Schedule is filed:

Rule 13d-1(b)

Rule 13d-1(c)

Rule 13d-1(d)

SCHEDULE 13G

CUSIP No. 596304204

1

Names of Reporting Persons

The Vanguard Group

2

Check the appropriate box if a member of a Group (see instructions)

(a)
(b)

3

Sec Use Only

4

Citizenship or Place of Organization

PENNSYLVANIA

Number of Shares Beneficially Owned by Each Reporting Person With:

5	Sole Voting Power 0.00
6	Shared Voting Power 3,041.00
7	Sole Dispositive Power 410,146.00
8	Shared Dispositive Power 5,905.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

416,051.00

10

Check box if the aggregate amount in row (9) excludes certain shares (See Instructions)

11

Percent of class represented by amount in row (9)

5.14 %

12

Type of Reporting Person (See Instructions)

IA

SCHEDULE 13G

Item 1.
(a)	Name of issuer: Middlefield Banc Corp
(b)	Address of issuer's principal executive offices: 15985 East High Street, PO Box 35, Middlefield, OH, 44062
Item 2.
(a)	Name of person filing: The Vanguard Group
(b)	Address or principal business office or, if none, residence: 100 Vanguard Blvd., Malvern, PA 19355
(c)	Citizenship: PA
(d)	Title of class of securities: Common Stock
(e)	CUSIP No.: 596304204
Item 3.	If this statement is filed pursuant to §§ 240.13d-1(b) or 240.13d-2(b) or (c), check whether the person filing is a:
(a)	Broker or dealer registered under section 15 of the Act (15 U.S.C. 78o);
(b)	Bank as defined in section 3(a)(6) of the Act (15 U.S.C. 78c);
(c)	Insurance company as defined in section 3(a)(19) of the Act (15 U.S.C. 78c);
(d)	Investment company registered under section 8 of the Investment Company Act of 1940 (15 U.S.C. 80a-8);
(e)	An investment adviser in accordance with § 240.13d-1(b)(1)(ii)(E);
(f)	An employee benefit plan or endowment fund in accordance with § 240.13d-1(b)(1)(ii)(F);
(g)	A parent holding company or control person in accordance with § 240.13d-1(b)(1)(ii)(G);
(h)	A savings associations as defined in Section 3(b) of the Federal Deposit Insurance Act (12 U.S.C. 1813);
(i)	A church plan that is excluded from the definition of an investment company under section 3(c)(14) of the Investment Company Act of 1940 (15 U.S.C. 80a-3);
(j)	A non-U.S. institution in accordance with § 240.13d-1(b)(1)(ii)(J). If filing as a non-U.S. institution in accordance with § 240.13d-1(b)(1)(ii)(J), please specify the type of institution:
(k)	Group, in accordance with Rule 240.13d-1(b)(1)(ii)(K).
Item 4.	Ownership
(a)	Amount beneficially owned: 416051
(b)	Percent of class: 5.14 %
(c)	Number of shares as to which the person has:
	(i) Sole power to vote or to direct the vote: 0
	(ii) Shared power to vote or to direct the vote: 3041
	(iii) Sole power to dispose or to direct the disposition of: 410146
	(iv) Shared power to dispose or to direct the disposition of: 5905
Item 5.	Ownership of 5 Percent or Less of a Class.
Item 6.	Ownership of more than 5 Percent on Behalf of Another Person.
	If any other person is known to have the right to receive or the power to direct the receipt of dividends from, or the proceeds from the sale of, such securities, a statement to that effect should be included in response to this item and, if such interest relates to more than 5 percent of the class, such person should be identified. A listing of the shareholders of an investment company registered under the Investment Company Act of 1940 or the beneficiaries of employee benefit plan, pension fund or endowment fund is not required. The Vanguard Group, Inc.'s clients, including investment companies registered under the Investment Company Act of 1940 and other managed accounts, have the right to receive or the power to direct the receipt of dividends from, or the proceeds from the sale of, the securities reported herein. No one other person's interest in the securities reported herein is more than 5%.
Item 7.	Identification and Classification of the Subsidiary Which Acquired the Security Being Reported on by the Parent Holding Company or Control Person.
	Not Applicable
Item 8.	Identification and Classification of Members of the Group.
	Not Applicable
Item 9.	Notice of Dissolution of Group.
	Not Applicable

Item 10.

Certifications:

By signing below I certify that, to the best of my knowledge and belief, the securities referred to above were acquired and are held in the ordinary course of business and were not acquired and are not held for the purpose of or with the effect of changing or influencing the control of the issuer of the securities and were not acquired and are not held in connection with or as a participant in any transaction having that purpose or effect, other than activities solely in connection with a nomination under § 240.14a-11.

SIGNATURE

After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct.

The Vanguard Group

Signature:	Ashley Grim
Name/Title:	Head of Global Fund Administration
Date:	07/29/2025

FAQ

How many MYGN shares does Vanguard own?

9,257,493 shares as of 30 Jun 2025.

What percentage of Myriad Genetics’ outstanding shares is held by Vanguard?

Approximately 10.04 %.

Does Vanguard control the voting of MYGN shares?

It has 0 sole voting power and 145,939 shares with shared voting power.

Why did Vanguard file Schedule 13G/A for MYGN?

Crossing the 5 % (now 10 %) ownership threshold requires disclosure under Rule 13d-1(b) for institutional investors.

Under which rule was the filing made?

Rule 13d-1(b) as an investment adviser (IA).

Who signed the filing for Vanguard?

Ashley Grim, Head of Global Fund Administration, on 29 Jul 2025.