Middlefield Banc Corp.
Investor Relations
| Shareholder Services |
| American Stock Transfer & Trust Company 6201 15th Avenue Brooklyn, NY 11219 Tool Free: 800/937-5449 International: 718-921-8156 Fax: 718-236-2641 Web site: http://www.amstock.com e-mail: |
| Customer Service Hours: |
| Automated and online support is available 24 hours a day, 365 days a year, or speak to a personal representative from Monday - Thursday, 8:00 a.m. to 7:00 p.m. Friday, 8:00 a.m. to 5:00 p.m. EST. |
| For Dividend Reinvestment and Direct Stock Purchase: (Written Correspondence) |
| American Stock Transfer & Trust Company P.O. Box 922 Wall Street Station New York, NY 10269-0560 |
| Account Access |
| Proxy Vote |
| The e-mail links provided are not transmitted via secure domain and confidential information such as passwords, Social Security numbers, account numbers, etc. should not be included in your correspondence. |

