Comparable stake leader
VANGUARD GROUP INC
SEC ownership of MIDDLEFIELD BANC CORP
Top holders, 13D/G large-stake signals, insider positions, and transaction flow tied to CIK 0000836147.
Disclosed value leader
VANGUARD GROUP INC
Comparable rows
3/28
Latest evidence
31 Mar 2026
- Parsed ownership sources
- 13D/G, 13F, and 3/4/5
- Largest SEC-reported holder
- VANGUARD GROUP INC
- Latest 13D/G holder
- VANGUARD GROUP INC
- Latest parsed ownership date
- 31 Mar 2026
- Issuer CIK
- 0000836147
- Issuer location
- Middlefield, OH
Ownership snapshot
CIK-linked ownership evidence from parsed SEC filings.
2 signals
Issuer
Names, identifiers, and filing context for this profile.
2 identity fields
Ownership snapshot
Top shareholders of MIDDLEFIELD BANC CORP (13F + 13D/G + 3/4/5)
Grouped by holder across the latest SEC ownership disclosures. Start with comparable ownership when available, then verify the linked 13F, 13D/G, or 3/4/5 evidence.
Comparable stake leader
VANGUARD GROUP INC
Disclosed value leader
VANGUARD GROUP INC
Comparable rows
3/28
Latest evidence
31 Mar 2026
13D/G
13F
3/4/5
Lead comparable stake: 5.1%
25 rows are not safely comparable across share classes.
13D/G row: VANGUARD GROUP INC
Showing 1-8 of 28 holder rows.
Quick read
VANGUARD GROUP INC leads the comparable SEC ownership view at 5.1%.
3 of 28 rows have a safely comparable ownership percentage. Use this as a filing-backed starting point, then open the detailed table for source links, reporting role, position value, share count, and filing date.
Open SEC evidence
Opens VANGUARD GROUP INC's linked filing trail.
Comparable ownership
Top 3
VANGUARD GROUP INC
5.1%
Castle Creek Capital Partners VI, LP
3.9%
IFP Advisors, Inc
0%
Ownership % is shown only when SEC disclosures are safely comparable across share classes.
Detailed SEC evidence table Showing 1-8 of 28 holder rows
| Holder | Evidence | Ownership % | Position | 12M Net Δ | As of |
|---|---|---|---|---|---|
| VANGUARD GROUP INC |
13D/G
The Vanguard Group
|
5.1%
|
$12,526,713
416,051 shares
|
$0 | 30 Jun 2025 |
| Castle Creek Capital Partners VI, LP |
13D/G
|
3.9%
|
$10,805,767
312,847 shares
|
$0 | 30 Jan 2026 |
| IFP Advisors, Inc |
13F
Company
|
0%
|
$67
2 shares
|
— | 31 Mar 2026 |
| James R. Heslop II |
3/4/5
EVP/Chief Executive Officer, Director
|
—
mixed-class rows
|
$1,207,206
40,215 shares
mixed-class rows
|
— | 02 Jan 2024 |
| Darryl E. Mast |
3/4/5
Director
|
—
class O/S missing
|
$1,055,489
37,629 shares
|
— | 01 Jan 2025 |
| Thomas G. Caldwell |
3/4/5
President/Chief Executive Offi, Director
|
—
class O/S missing
|
$1,041,131
32,163 shares
|
— | 31 Mar 2022 |
| Clayton W. Rose III |
3/4/5
Director
|
—
class O/S missing
|
$356,958
11,027 shares
|
— | 08 Nov 2021 |
| Moore Charles O |
3/4/5
President, Central Ohio Region
|
—
class O/S missing
|
$196,003
6,055 shares
|
— | 13 Jan 2023 |
How to read this table
Rows are grouped by holder and ranked first by SEC-reported ownership % when it is safely comparable, then by disclosed holdings value. — indicates unavailable or non-comparable values; "mixed-class rows" means the latest filing spans non-comparable classes.
Forms 3/4/5 flow
Insider trading overview
Insider buy and sell flow is broadly balanced over the last 12 months. No Buy or Sell transactions have been reported since 07 Jun 2025.
Buys
$0
Insiders: 0
Sells
$0
Insiders: 0
Net
$0
Shares: 0
Window
Last 12 months
4 rolling buckets
Buy value
Sell value
Shares: 0
Shares: 0
| Window (months) | Buy shares | Sell shares | Buy value | Sell value | Net value |
|---|---|---|---|---|---|
| 0-3 | 0 | 0 | $0 | $0 | $0 |
| 3-6 | 0 | 0 | $0 | $0 | $0 |
| 6-9 | 0 | 0 | $0 | $0 | $0 |
| 9-12 | 0 | 0 | $0 | $0 | $0 |
Reporting owners
Insider holders from Forms 3/4/5
Showing 1-20 of 26 reporting-owner rows connected to MIDDLEFIELD BANC CORP. Open a relationship link for the CIK-to-CIK filing trail.
Rows
26
Largest Forms 3/4/5 holder
James R. Heslop II
Net 12M change
$0
Latest report
02 Mar 2026
Recent insider transactions for MIDDLEFIELD BANC CORP
Showing up to 300 recent insider transactions from the last 12 months.
| Insider | Symbol | Class | Transaction | % | SEC-reported value | SEC-reported price | Shares | Shares owned | Date | Ownership |
|---|---|---|---|---|---|---|---|---|---|---|
| Carolyn J. Turk | MBCN | Common Stock | Disposed to Issuer | -100% | -32,560 | 0 | 02 Mar 2026 | Direct | ||
| William J. Skidmore | MBCN | Common Stock | Disposed to Issuer | -100% | -22,755 | 0 | 02 Mar 2026 | Direct | ||
| Michael C. Voinovich | MBCN | Common Stock | Disposed to Issuer | -100% | -8,965 | 0 | 02 Mar 2026 | held in Rabbi Trust | ||
| Michael C. Voinovich | MBCN | Common Stock | Disposed to Issuer | -100% | -2,402 | 0 | 02 Mar 2026 | held in Roth IRA | ||
| Michael C. Voinovich | MBCN | Common Stock | Disposed to Issuer | -100% | -1,500 | 0 | 02 Mar 2026 | held in IRA (McD) | ||
| Michael C. Voinovich | MBCN | Common Stock | Disposed to Issuer | -100% | -10,022 | 0 | 02 Mar 2026 | held in IRA | ||
| Michael C. Voinovich | MBCN | Common Stock | Disposed to Issuer | -100% | -3,527 | 0 | 02 Mar 2026 | Direct | ||
| Thomas W. Bevan | MBCN | Common Stock | Disposed to Issuer | -100% | -53,088 | 0 | 02 Mar 2026 | Direct | ||
| Kevin A. DiGeronimo | MBCN | Common Stock | Disposed to Issuer | -100% | -5,071 | 0 | 02 Mar 2026 | Direct | ||
| Kenneth E. Jones | MBCN | Common Stock | Disposed to Issuer | -100% | -2,154 | 0 | 02 Mar 2026 | held by spouse | ||
| Kenneth E. Jones | MBCN | Common Stock | Disposed to Issuer | -100% | -17,725 | 0 | 02 Mar 2026 | Direct | ||
| James J. Mccaskey | MBCN | Common Stock | Disposed to Issuer | -100% | -1,372 | 0 | 02 Mar 2026 | held by spouse in retirement account | ||
| James J. Mccaskey | MBCN | Common Stock | Disposed to Issuer | -100% | -10,635 | 0 | 02 Mar 2026 | Direct | ||
| Jennifer L. Moeller | MBCN | Common Stock | Disposed to Issuer | -100% | -4,696 | 0 | 02 Mar 2026 | Direct | ||
| Ronald Len Zimmerly Jr. | MBCN | Common Stock | Disposed to Issuer | -100% | -84,689 | 0 | 02 Mar 2026 | Direct | ||
| Ronald Len Zimmerly Jr. | MBCN | Common Stock | Disposed to Issuer | -100% | -8,786 | 0 | 02 Mar 2026 | Held in IRA | ||
| Michael Ranttila | MBCN | Common Stock | Disposed to Issuer | -100% | -32,867 | 0 | 02 Mar 2026 | Direct | ||
| Michael Ranttila | MBCN | Common Stock | Disposed to Issuer | -100% | -300 | 0 | 02 Mar 2026 | held in IRA | ||
| Michael Ranttila | MBCN | Common Stock | Disposed to Issuer | -100% | -50 | 0 | 02 Mar 2026 | as Custodian for Grandson | ||
| Courtney M. Erminio | MBCN | Common Stock | Disposed to Issuer | -100% | -20,083 | 0 | 02 Mar 2026 | Direct | ||
| Michael L. Cheravitch | MBCN | Common Stock | Disposed to Issuer | -100% | -15,691 | 0 | 02 Mar 2026 | Direct | ||
| Rebecca A. Noblit | MBCN | Common Stock | Disposed to Issuer | -100% | -21,427 | 0 | 02 Mar 2026 | Direct | ||
| Thomas M. Wilson | MBCN | Common Stock | Disposed to Issuer | -100% | -22,790 | 0 | 02 Mar 2026 | Direct | ||
| Thomas M. Wilson | MBCN | Common Stock | Disposed to Issuer | -100% | -12,498 | 0 | 02 Mar 2026 | held in IRA | ||
| Sarah A. Winters | MBCN | Common Stock | Disposed to Issuer | -100% | -14,463 | 0 | 02 Mar 2026 | Direct | ||
| James J. Mccaskey | MBCN | Common Stock | Award | 7.33% | 405 | 5,929 | 23 Feb 2026 | Direct | ||
| Kenneth E. Jones | MBCN | Common Stock | Award | 2.34% | 405 | 17,725 | 23 Feb 2026 | Direct | ||
| Kevin A. DiGeronimo | MBCN | Common Stock | Award | 8.68% | 405 | 5,071 | 23 Feb 2026 | Direct | ||
| Thomas W. Bevan | MBCN | Common Stock | Award | 1.55% | 405 | 26,558 | 23 Feb 2026 | Direct | ||
| Michael C. Voinovich | MBCN | Common Stock | Award | 13% | 405 | 3,527 | 23 Feb 2026 | Direct | ||
| William J. Skidmore | MBCN | Common Stock | Award | 1.99% | 405 | 20,742 | 23 Feb 2026 | Direct | ||
| Carolyn J. Turk | MBCN | Common Stock | Award | 1.26% | 405 | 32,560 | 23 Feb 2026 | Direct | ||
| Sarah A. Winters | MBCN | Common Stock | Tax liability | -21.6% | -3,994 | 14,463 | 23 Feb 2026 | Direct | ||
| Sarah A. Winters | MBCN | Common Stock | Award | 275.9% | 13,547 | 18,457 | 23 Feb 2026 | Direct | ||
| Jennifer L. Moeller | MBCN | Common Stock | Award | 19.5% | 405 | 2,482 | 23 Feb 2026 | Direct | ||
| Rebecca A. Noblit | MBCN | Common Stock | Tax liability | -20.2% | -5,420 | 21,427 | 23 Feb 2026 | Direct | ||
| Rebecca A. Noblit | MBCN | Common Stock | Award | 242.1% | 18,999 | 26,847 | 23 Feb 2026 | Direct | ||
| Thomas M. Wilson | MBCN | Common Stock | Tax liability | -18.3% | -5,098 | 22,790 | 23 Feb 2026 | Direct | ||
| Thomas M. Wilson | MBCN | Common Stock | Award | 189.4% | 18,252 | 27,888 | 23 Feb 2026 | Direct | ||
| Courtney M. Erminio | MBCN | Common Stock | Tax liability | -19.1% | -4,714 | 19,932 | 23 Feb 2026 | Direct | ||
| Courtney M. Erminio | MBCN | Common Stock | Award | 204.3% | 16,547 | 24,646 | 23 Feb 2026 | Direct | ||
| Ronald Len Zimmerly Jr. | MBCN | Common Stock | Tax liability | -22.6% | -24,671 | 84,689 | 23 Feb 2026 | Direct | ||
| Ronald Len Zimmerly Jr. | MBCN | Common Stock | Award | 115.6% | 58,626 | 109,360 | 23 Feb 2026 | Direct | ||
| Michael Ranttila | MBCN | Common Stock | Tax liability | -13.4% | -5,087 | 32,867 | 23 Feb 2026 | Direct | ||
| Michael Ranttila | MBCN | Common Stock | Award | 94.4% | 18,435 | 37,954 | 23 Feb 2026 | Direct | ||
| Michael L. Cheravitch | MBCN | Common Stock | Tax liability | -19% | -3,668 | 15,691 | 23 Feb 2026 | Direct | ||
| Michael L. Cheravitch | MBCN | Common Stock | Award | 197.8% | 12,859 | 19,359 | 23 Feb 2026 | Direct | ||
| Ronald Len Zimmerly Jr. | MBCN | Common Stock | Tax liability | -1.47% | -758 | 50,734 | 14 Jan 2026 | Direct | ||
| Ronald Len Zimmerly Jr. | MBCN | Common Stock | Award | 4.65% | 2,288 | 51,492 | 14 Jan 2026 | Direct | ||
| Sarah A. Winters | MBCN | Common Stock | Tax liability | -6.19% | -324 | 4,910 | 14 Jan 2026 | Direct |
* marks a reported price that did not pass the local price check.