Who owns MIDDLEFIELD BANC CORP, from the filings themselves: stakes over 5% (Schedule 13D/G), the institutional managers reporting the stock each quarter (13F), and the funds holding it (N-PORT).
Investors crossing 5% ownership must disclose it. Schedule 13G filers certify the stake is passive; Schedule 13D is the general form for everyone else — founders, strategic holders, and activists alike. Each entry is the holder's most recent disclosure. Coverage begins with SEC's structured filings from December 18, 2024; a holder appears once they file or amend after that date.
Castle Creek Capital Partners VI, LP: 3.9% · 312,847 shares — Castle Creek Capital VI LLC: 3.9% · 312,847 shares
The Vanguard Group: 5.1% · 416,051 shares
Every institutional manager whose latest 13F reports this stock, largest position first. "% of their portfolio" is the weight inside that manager's own book — how much conviction the position represents; "% of company" is how much of MIDDLEFIELD BANC CORP they hold. Together these 90 managers report 37.39% of shares outstanding.
| Investor | Position value | Shares | % of their portfolio | % of company | As of |
|---|---|---|---|---|---|
| Castle Creek Capital Partners VI, LP | $16.8M | 560,500 | 30.11% | 6.93% | September 30, 2025 |
| BlackRock, Inc. | $16M | 464,415 | 0.00% | 5.74% | December 31, 2025 |
88 more institutional holders behind a free account
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Sign up freeFunds disclosing this stock in their monthly N-PORT portfolio, with the position's share of the fund's net assets. Together these 105 funds hold 12.69% of shares outstanding — counted inside the manager totals above, not on top of them, since a fund's shares also appear in its manager's 13F.
| Fund | Position value | % of net assets | % of company | As of |
|---|---|---|---|---|
| VANGUARD TOTAL STOCK MARKET INDEX FUND | $8.05M | 0.00% | 2.88% | December 31, 2025 |
| iShares Russell 2000 ETF | $6.59M | 0.01% | 2.36% | December 31, 2025 |
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