Middlefield Banc Corp.
Middlefield Banc Corp. (MBCN) Stock Ownership
Institutional vs insider vs public ownership from 13F and float data — top holders, activity, and insider trades below.
SEC 13F · FMP · MBCN · as of Sep 30, 2025
Ownership Breakdown
73
Institutional Holders
▲ 5 vs Q2
$83.18M
Total Inst. Value
▼ $371,929 vs Q2
8.13M
Shares Outstanding
freeFloat 95.46%
2.77M
13F Shares Held
▼ 3,117 vs Q2
Institutional ownership = 13F shares ÷ total outstanding. Insider % = 100 − free float. Public % = free float − institution %. Data: FMP /symbol-positions-summary + /shares-float + SEC EDGAR.
Top Institutional Holders
MBCN largest shareholders · institutional ownership
Q3 2025 · SEC 13F
Showing top 10 holders
| Holder | Shares | % Owned | Weight | Value | Reported | Change |
|---|---|---|---|---|---|---|
CASTLE CREEK CAPITAL PARTNERS VI, LP state commercial banks | 560.5K | 6.94% | 6.94% | $16.82B | Nov 5, 2025 | — held |
BLACKROCK, INC. state commercial banks | 473.6K | 5.86% | 5.86% | $14.21B | Nov 12, 2025 | ▼ 6.2K |
VANGUARD GROUP INC state commercial banks | 413.7K | 5.12% | 5.12% | $12.42B | Nov 7, 2025 | ▼ 2.3K |
ALLIANCEBERNSTEIN L.P. state commercial banks | 197.5K | 2.44% | 2.44% | $5.93B | Nov 14, 2025 | ▲ 17.8K |
GEODE CAPITAL MANAGEMENT, LLC state commercial banks | 170.7K | 2.11% | 2.11% | $5.12B | Nov 12, 2025 | ▼ 396 |
STATE STREET CORP state commercial banks | 104.0K | 1.29% | 1.29% | $3.12B | Nov 14, 2025 | ▼ 217 |
ELIZABETH PARK CAPITAL ADVISORS, LTD. state commercial banks | 96.5K | 1.19% | 1.19% | $2.90B | Nov 13, 2025 | ▲ 10.2K |
DIMENSIONAL FUND ADVISORS LP state commercial banks | 83.9K | 1.04% | 1.04% | $2.52B | Nov 12, 2025 | ▼ 1.2K |
NORTHERN TRUST CORP state commercial banks | 55.4K | 68.59% | 68.59% | $1.66B | Nov 14, 2025 | ▲ 735 |
BRIDGEWAY CAPITAL MANAGEMENT, LLC state commercial banks | 50.4K | 62.39% | 62.39% | $1.51B | Nov 14, 2025 | ▲ 1.8K |
Data from SEC Form 13F filings. Ownership bar normalised to largest holder. Change flags: isNew / isSoldOut / changeInSharesNumber (FMP extract-analytics/holder).
Institutional Activity
Q3 2025 vs prior quarter
Q3 2025
15
Increased
+57.3K shares3
New Positions
first time holders18
Decreased
−27.5K shares0
Sold Out
fully exitedNet shares change (top 50)
+29.9K
+57.3K / −27.5K
Net new holders
+0
3 new / 0 exited
Based on top 50 institutional holders by position size. Fields: isNew, isSoldOut, changeInSharesNumber (FMP extract-analytics/holder, limit=50).
Insider Buying vs Selling
MBCN insider trading · insider activity
Source: SEC Form 4
42
Buy transactions
29
Sell transactions
1.45
Buy/Sell ratio
$0M
Total disposed
Recent Insider Transactions
Showing 10 most recent · Common Stock only
| Name · Role | Date | Type | Shares | Price | Value | After Trans. | Filing |
|---|---|---|---|---|---|---|---|
TURK CAROLYN J director | Mar 2, 2026 | D-Return | 32,560 | — | — | 0 | Form 4 ↗ |
Skidmore William J director | Mar 2, 2026 | D-Return | 2,013.359 | — | — | 0 | Form 4 ↗ |
Voinovich Michael C director | Mar 2, 2026 | D-Return | 8,965 | — | — | 0 | Form 4 ↗ |
Bevan Thomas W director | Mar 2, 2026 | D-Return | 26,530 | — | — | 0 | Form 4 ↗ |
DiGeronimo Kevin A director | Mar 2, 2026 | D-Return | 5,071 | — | — | 0 | Form 4 ↗ |
Jones Kenneth E director | Mar 2, 2026 | D-Return | 2,153.668 | — | — | 0 | Form 4 ↗ |
MCCASKEY JAMES J director | Mar 2, 2026 | D-Return | 1,372 | — | — | 0 | Form 4 ↗ |
Moeller Jennifer L director | Mar 2, 2026 | D-Return | 2,213.763 | — | — | 0 | Form 4 ↗ |
Zimmerly Ronald Len Jr. Chief Executive Officer | Mar 2, 2026 | D-Return | 84,689.283 | — | — | 0 | Form 4 ↗ |
RANTTILA MICHAEL EVP/CFO | Mar 2, 2026 | D-Return | 32,867.1 | — | — | 0 | Form 4 ↗ |
Source: /insider-trading/search (FMP stable). Buy/Sell direction: acquisitionOrDisposition A=Buy, D=Sell. RSU vesting (M-Exempt) excluded from sentiment bar. All data from SEC EDGAR public filings.
About institutional & insider ownership
Middlefield Banc Corp. (MBCN) is primarily owned by institutional investors, who hold approximately 34.1% of total shares outstanding. Company insiders own approximately 4.54%, while retail and public investors account for the remaining 61.36%.
The largest institutional shareholder of Middlefield Banc Corp. is CASTLE CREEK CAPITAL PARTNERS VI, LP, holding approximately 560,500 shares — equal to 6.94% of outstanding shares — as of September 30, 2025.
A total of 73 institutional investors currently hold MBCN stock, with a combined institutional value of approximately $83,176,217 as of the most recent 13F filing period.
Frequently asked questions
MBCN ownershipMiddlefield Banc Corp. (MBCN) is primarily owned by institutional investors, who hold approximately 34.1% of shares. The largest shareholder is CASTLE CREEK CAPITAL PARTNERS VI, LP with a 6.94% stake. Company insiders hold 4.54%. Data sourced from SEC Form 13F as of September 30, 2025.