UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, D.C. 20549





FORM 10-K/A

(Amendment No. 1)

(Mark One)

|x | ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934
|- | ------------------------------------------------------------------------------------

For the fiscal year ended December 31, 2011

OR



| ̈ | TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934
|- | ----------------------------------------------------------------------------------------

For the transition period
from                to

Commission file number 0-30777





PACIFIC
MERCANTILE BANCORP

(Exact name of Registrant as specified in its charter)



|                                                               |  |                                     
|-------------------------------------------------------------- |  | ------------------------------------
|California                                                     |  | 33-0898238                          
|(State or other jurisdiction of
incorporation or organization) |  | (I.R.S. Employer Identification No.)
|                                                               | 
|949 South Coast Drive, Suite 300, Costa Mesa, California       |  | 92626                               
|(Address of principal executive offices)                       |  | (Zip Code)                          

(714) 438-2500

(Registrants telephone number, including area code)

Securities
registered pursuant to Section 12(b) of the Act:



|                               |  |                                          
|------------------------------ |  | -----------------------------------------
|Title of each class registered |  | Name of each Exchange on which registered
|Common Stock without par value |  | NASDAQ Global Select Market              

Securities registered pursuant to Section 12(g) of the Act:

None





Indicate by
check mark if the registrant is a well-known seasoned issuer, as defined in Rule 405 of the Securities Act.    Yes   ̈    No  x.

Indicate by check mark if the registrant is not required to file reports
pursuant to Section 13 of 15(d) of the Act.    Yes   ̈    No  x.

Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the
Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports); and (2) has been subject to such filing requirements for the past 90
days.    Yes  x    No   ̈

Indicate by check mark whether the registrant has submitted electronically and posted on its corporate Web site, if any, every
Interactive Data File required to be submitted and posted pursuant to Rule 405 of Regulation S-T (§232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit and post such
files).    Yes  x    No   ̈.

Indicate by check mark if disclosure of delinquent filers pursuant to Item 405 of Regulation S-K is not contained herein, and will
not be contained, to the best of registrants knowledge, in definitive proxy or information statements incorporated by reference in Part III of this Form 10-K or any amendment to this Form 10-K.     ̈

Indicate by check mark whether the registrant is a large accelerated filer, an
accelerated filer, a non-accelerated filer or a smaller reporting company. See definitions of large accelerated filer, accelerated filer, non-accelerated filer, and smaller reporting company in
Rule 12b-2 of the Exchange Act. (Check one):



|                        |  |   |  |                           |  |  
|----------------------- |  | - |  | ------------------------- |  | -
|Large accelerated filer |  |  ̈ |  | Accelerated filer         |  |  ̈
|                        |  |   | 
|Non-accelerated filer   |  |  ̈ |  | Smaller reporting company |  | x

Indicate by check mark whether the registrant is a shell company (as defined in Securities Exchange Act
Rule 12b-2).    Yes     ̈    No  x

The aggregate market value of voting shares held by non-affiliates of registrant as of June 30, 2011, which was determined on the
basis of the closing price of registrants shares of common stock on that date, was approximately $41,300,000.

As of
February 17, 2012, there were 12,454,045 shares of Common Stock outstanding.





DOCUMENTS
INCORPORATED BY REFERENCE

Except as otherwise stated therein, Part III of the Form 10-K is incorporated by reference from
the Registrants Definitive Proxy Statement which was filed with the Commission on April 18, 2012 for its 2012 Annual Meeting of Shareholders.









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EXPLANATORY NOTE

This Amendment No. 1 on Form 10-K/A (the Amendment) amends our Annual Report on Form 10-K for the year ended
December 31, 2011 (the Original Annual Report), which we filed with the Securities and Exchange Commission (the SEC) on February 27, 2012. We are filing this Amendment to amend and restate the information which was
(i) disclosed under the caption Certain Transactions in our definitive proxy statement (the Proxy Statement), filed with the SEC on April 18, 2012, and (ii) incorporated into Item 13 of the Original Annual
Report by reference to that information in the Proxy Statement. In addition, pursuant to Rule 12b-15 under the Securities Exchange Act of 1934, as amended, new certifications by our principal executive officer and principal financial officer are
being filed herewith as Exhibits 31.3 and 31.4, respectively, to this Amendment. Item 15 of the Original Annual Report is therefore hereby amended and restated in its entirety, with the only changes being the addition of Exhibits 31.3 and
31.4 filed herewith and related footnotes.

Except as described above, no attempt has been made in this Amendment to modify or
update other disclosures or information set forth in the Original Annual Report. This Amendment does not reflect events occurring after the filing of the Original Annual Report and it does not modify or update those disclosures, including the
exhibits to the Original Annual Report affected by subsequent events. Accordingly, this Amendment should be read in conjunction with our reports filed, and any other filings made by us with the SEC subsequent to the filing of the Original Annual
Report, including any amendments to those reports or other filings.



(i)



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PART III



|ITEM 13. | CERTAIN RELATIONSHIPS AND RELATED TRANSACTIONS, AND DIRECTOR INDEPENDENCE
|-------- | -------------------------------------------------------------------------

Certain Transactions

In the ordinary course of its business, the Bank
makes loans to and engages in other banking transactions with its directors and their associates and with its officers. Such loans and other banking transactions are made on the same terms, including interest rates and collateral securing the loans,
as those prevailing at the time for comparable transactions with persons of comparable creditworthiness who have no affiliation with the Company or the Bank. In addition, such loans are made only if they do not involve more than the normal risk of
collectability of loans made to non-affiliated persons and do not present any other unfavorable features.

The landlord from
which the Bank leases its headquarters offices and an office where it operates one of its financial centers is a limited partnership of which Mr. Argyros, currently a director of the Company, is the majority equity owner and the CEO of its
general partner. The leases, which were originally entered into in 2000, were renewed in May 2009, each for a term of seven years, at base rents of $50,510 and $7,027 per month in the first year, increasing by approximately 2% per year
thereafter. In July 2009, the Bank leased an additional office from the same landlord, under a three year lease (the Additional Office Lease) at a monthly rent that averages approximately $10,215 over that three year period. The rents
and other material terms of these leases were negotiated at arms-length and were approved long before Mr. Argyros was invited to join the Companys Board of Directors.

In the spring of 2009, the Company commenced a new residential mortgage banking business to take advantage of the low interest rate
environment, which we believed would lead to increased demand for residential mortgage loans and would provide the Bank with an additional source of revenue which could offset the adverse impact of low interest rates on our net interest margins on
the loans we were making.

In 2011, our mortgage banking business grew substantially in the dollar volume of both the mortgage
loans we originated and the sales of those loans into the secondary market. That growth was largely attributable to (i) historically low interest rates, which led to increased demand for mortgage loan refinancings by homeowners in our markets,
and (ii) declining real estate prices which, coupled with the low interest rates, led to increases in the demand for mortgage loans to finance purchases of homes. At the same time, we succeeded in attracting additional institutional investors
in the secondary mortgage market for our mortgage loan products.

To support this growth, we added more mortgage personnel
throughout 2011 and, as a result, the number of mortgage personnel we employed at December 31, 2011 was 126% greater than at December 31, 2010. In addition, based on the mortgage loan commitments outstanding at December 31, 2011 and
the fact that mortgage interest rates continued to be at all-time lows, we anticipated this growth would continue. As a result, in December 2011, we also reached an agreement with the landlord to amend the Additional Office Lease to extend its term
by three years from February 2, 2012 to January 31, 2015 and to increase the square footage being leased by the Bank from 10,122 to 13,361 rentable square feet at an average rent of approximately $33,625 per month.

The rents and other material terms of the December 2011 lease amendment were negotiated at arms-length and approved by the disinterested
directors of the Bank, after being fully informed of the financial interest of Mr. Argyros in that transaction. Mr. Argyros, who has been a director of the Company since 2010, did not participate in the deliberations of the Board of
Directors with respect to and did not vote on approval of the lease amendment.



2



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PART IV



|ITEM 15. | EXHIBITS AND FINANCIAL STATEMENT SCHEDULES
|-------- | ------------------------------------------

The following documents are filed as part of this Report:



| | (1) | Financial Statements. None.
| | --- | ---------------------------



| | (2) | Financial Statement Schedules. None.
| | --- | ------------------------------------



| | (3) | Exhibits. See Exhibit Index, elsewhere in this Amendment, for a list and description of (i) exhibits previously filed by the Company with the Commission and
(ii) the exhibits being filed with this Amendment.
| | --- | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



3



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SIGNATURES

Pursuant to the requirements of Section 13 or 15(d) of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly
authorized, on the 8th day of August 2012.



PACIFIC MERCANTILE BANCORPBy:

/s/ RAYMOND E. DELLERBARaymond E. DellerbaPresident and Chief Executive Officer




S-1



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EXHIBIT INDEX



|            |  |                                                                                                                                                                                                                                                                                                                                                              
|----------- |  | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
|Exhibit No. |  | Description of Exhibit                                                                                                                                                                                                                                                                                                                                       
|            | 
|3.1         |  | Articles of Incorporation of Pacific Mercantile
Bancorp(1)                                                                                                                                                                                                                                                                                                   
|            | 
|3.2         |  | Certificate of Amendment of Articles of Incorporation of Pacific Mercantile Bancorp (Incorporated by reference to Exhibit 3.1 to the Quarterly Report on Form 10-Q dated August
14, 2001.)                                                                                                                                                                   
|            | 
|3.3         |  | Certificate of Amendment of Articles of Incorporation of Pacific Mercantile Bancorp (Incorporated by reference to Exhibit 3.1 to the Current Report on Form 8-K dated January 26,
2012 and filed with the Commission on February 1, 2012.)                                                                                                                   
|            | 
|3.4         |  | Certificate of Determination of Rights, Preferences, Privileges and Restrictions of Series A Convertible 10% Cumulative Preferred Stock of Pacific Mercantile Bancorp. (Incorporated
by reference to Exhibit 3.1 to the Current Report on Form 8-K (No. 000-30777) dated October 6, 2009.)                                                                   
|            | 
|3.5         |  | Certificate of Amendment of Certificate of Determination of Rights, Preferences, Privileges and Restrictions of the Series A Convertible 10% Cumulative Preferred Stock of Pacific
Mercantile Bancorp. (Incorporated by reference to Exhibit 3.2 to the Current Report on Form 8-K dated January 26, 2012 and filed with the Commission on February 1, 2012.)
|            | 
|3.6         |  | Certificate of Determination of Rights, Preferences, Privileges and Restrictions of the Series B Convertible 8.4% Noncumulative Preferred Stock of Pacific Mercantile Bancorp.
(Incorporated by reference to Exhibit 3.1 to the Current Report on Form 8-K (No. 000-30777) dated August 22, 2011.)                                                           
|            | 
|3.7         |  | Certificate of Determination of Rights, Preferences, Privileges and Restrictions of the Series C 8.4% Noncumulative Preferred Stock of Pacific Mercantile Bancorp. (Incorporated by
reference to Exhibit 3.2 to the Current Report on Form 8-K (No. 000-30777) dated August 22, 2011.)                                                                       
|            | 
|3.8         |  | Pacific Mercantile Bancorp Bylaws, Amended and Restated as of December 17, 2007. (Incorporated by reference to the same numbered exhibit to the Companys Current Report on
Form 8-K (No. 000-30777) dated December 18, 2007.)                                                                                                                               
|            | 
|4.1         |  | Specimen form of Pacific Mercantile Bancorp Common Stock Certificate(1)                                                                                                                                                                                                                                                                                      
|            | 
|4.2         |  | Specimen form of Pacific Mercantile Bancorp Series B-1 Preferred Stock Certificate. (Incorporated by reference to Exhibit 4.1 to the Current Report on Form 8-K (No. 000-30777) dated
August 30, 2011.)                                                                                                                                                      
|            | 
|4.3         |  | Specimen form of Pacific Mercantile Bancorp Series B-2 Preferred Stock Certificate. (Incorporated by reference to Exhibit 4.2 to the Current Report on Form 8-K (No. 000-30777) dated
August 30, 2011.)                                                                                                                                                      
|            | 
|10.1        |  | Series B Preferred Stock Purchase Agreement. (Incorporated by reference to Exhibit 10.1 to the Current Report on Form 8-K (No. 000-30777) dated August 30,
2011.)                                                                                                                                                                                            
|            | 
|10.2        |  | SBAV Investor Rights Agreement. (Incorporated by reference to Exhibit 10.2 to the Current Report on Form 8-K(No. 000-30777) dated August 30, 2011.)                                                                                                                                                                                                          
|            | 
|10.3        |  | Carpenter Investor Rights Agreement. (Incorporated by reference to Exhibit 10.3 to the Current Report on Form 8-K (No. 000-30777) dated August 30, 2011.)                                                                                                                                                                                                    
|            | 
|10.4        |  | Registration Rights Agreement. (Incorporated by reference to Exhibit 10.4 to the Current Report on Form 8-K (No. 000-30777) dated August 30, 2011.)                                                                                                                                                                                                          
|            | 
|10.5        |  | Additional Series B Preferred Stock Purchase Agreement (Incorporated by reference to Exhibit 10.5 to the Current Report on Form 8-K (No. 000-30777) dated August 30,
2011.)                                                                                                                                                                                  
|            | 
|10.6        |  | Common Stock Purchase Agreement. (Incorporated by reference to Exhibit 10.6 to the Current Report on Form 8-K (No. 000-30777) dated August 30, 2011.)                                                                                                                                                                                                        
|            | 
|10.7        |  | Form of Indemnification Agreement. (Incorporated by reference to Exhibit 10.1 to the Registration Statement (No. 333-177141) on Form S-8 dated October 3,
2011.)                                                                                                                                                                                             
|            | 
|10.8        |  | Standard Internet Banking System Licensing Agreement, dated as of January 29, 1999, between Q-UP Systems and PM Bank(1)                                                                                                                                                                                                                                      
|            | 
|10.9        |  | ODFIOriginator Agreement for Automated Clearing House Entries, dated as of February 16, 1999, between eFunds Corporation and Pacific Mercantile Bank(2)                                                                                                                                                                                                     
|            | 
|10.10       |  | Agreement, dated September 15, 1998, between Fiserv Solutions, Inc. and Pacific Mercantile Bank(1)                                                                                                                                                                                                                                                           



E-1



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|            |  |                                                                                                                                                                                                                                                                                                                         
|----------- |  | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
|Exhibit No. |  | Description of Exhibit                                                                                                                                                                                                                                                                                                  
|            | 
|10.11       |  | Commercial Office Building Lease dated February 26, 2001 between Metro Point 13580, Lot Three, a California limited partnership, and Pacific Mercantile Bank. (Incorporated by
reference to the same numbered exhibit to the Companys Annual Report on Form 10-K (No. 000-30777) for the year ended December 31, 2000.)
|            | 
|10.12       |  | Office Space Lease dated March 9, 2001 between California State Teachers Retirement System and PMBank(3)                                                                                                                                                                                                                
|            | 
|10.13       |  | Assignment & Assumption of Office Space Lease, dated April 1, 2003, between First National Bank and PMBank(4)                                                                                                                                                                                                           
|            | 
|10.14       |  | Office Space Lease, dated Sept. 14, 2003, between Leonard & Gerald Katz and Pacific Mercantile Bank(5)                                                                                                                                                                                                                  
|            | 
|10.15       |  | Pacific Mercantile Bancorp 2004 Stock Incentive Plan (Incorporated by reference to the same numbered exhibit to the Companys Annual Report on Form 10-K (No. 000-30777) for the
year ended December 31, 2006.)**                                                                                                       
|            | 
|10.16       |  | Employment Agreement between Pacific Mercantile Bank and Raymond E. Dellerba, as amended and restated effective as of January 1, 2007.(6)**                                                                                                                                                                             
|            | 
|10.17       |  | Supplemental Retirement Plan established by Pacific Mercantile Bank for Raymond E. Dellerba, as restated for purposes of Section 409A of the Internal Revenue Code as of
April 6, 2007.(6)**                                                                                                                            
|            | 
|10.18       |  | Pacific Mercantile Bancorp 2008 Equity Incentive Plan. (Incorporated by reference to Appendix A to the Companys 2008 Definitive Proxy Statement (No. 000-30777) filed with the
Commission on April 18, 2008.)**                                                                                                        
|            | 
|10.19       |  | Written Agreement dated August 31, 2010 between the Federal Reserve Bank of San Francisco and Pacific Mercantile Bancorp and Pacific Mercantile Bank. (Incorporated by reference
to Exhibit 10.1 to the Current Report on Form 8-K (No. 000-30777) dated August 31, 2010.)                                              
|            | 
|10.20       |  | Final Order dated August 31, 2010 issued by the California Department of Financial Institutions to Pacific Mercantile Bank. (Incorporated by reference to Exhibit 10.2 to the
Current Report on Form 8-K (No. 000-30777) dated August 31, 2010.)                                                                        
|            | 
|21          |  | Subsidiaries of the Company(7)                                                                                                                                                                                                                                                                                          
|            | 
|23.1        |  | Consent of Squar, Milner, Peterson, Miranda & Williamson, LLP, Independent Registered Public Accounting Firm(7)                                                                                                                                                                                                         
|            | 
|24.1        |  | Power of Attorney (contained on the Signature Page of Annual Report)(7)                                                                                                                                                                                                                                                 
|            | 
|31.1        |  | Certification of Chief Executive Officer pursuant to Section 302 of the Sarbanes-Oxley Act of 2002(7)                                                                                                                                                                                                                   
|            | 
|31.2        |  | Certification of Chief Financial Officer pursuant to Section 302 of the Sarbanes-Oxley Act of 2002(7)                                                                                                                                                                                                                   
|            | 
|31.3        |  | Certification of Chief Executive Officer pursuant to Section 302 of the Sarbanes-Oxley Act of 2002*                                                                                                                                                                                                                     
|            | 
|31.4        |  | Certification of Chief Financial Officer pursuant to Section 302 of the Sarbanes-Oxley Act of 2002*                                                                                                                                                                                                                     
|            | 
|32.1        |  | Certification of Chief Executive Officer pursuant to Section 906 of the Sarbanes-Oxley Act of 2004(8)                                                                                                                                                                                                                   
|            | 
|32.2        |  | Certification of Chief Financial Officer pursuant to Section 906 of the Sarbanes-Oxley Act of 2004(8)                                                                                                                                                                                                                   



|                |  |                                                             
|--------------- |  | ------------------------------------------------------------
|                | 
|Exhibit 101.INS |  | XBRL Instance Document(8)***                                
|                | 
|Exhibit 101.SCH |  | XBRL Taxonomy Extension Schema
Document(8)***               
|                | 
|Exhibit 101.CAL |  | XBRL Taxonomy Extension Calculation Linkbase
Document(8)*** 
|                | 
|Exhibit 101.DEF |  | XBRL Taxonomy Extension Definition Linkbase
Document(8)***  
|                | 
|Exhibit 101.LAB |  | XBRL Taxonomy Extension Labels Linkbase
Document(8)***      
|                | 
|Exhibit 101.PRE |  | XBRL Taxonomy Extension Presentation Linkbase
Document(8)***



|(1) | Incorporated by reference to the same numbered exhibit to the Companys Registration Statement (No. 333-33452) on Form S-1 filed with the Commission on
June 14, 2000 (the S-1 Registration Statement).
|--- | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

|(2) | Incorporated by reference to the Exhibit 10.8 to the above referenced S-1 Registration Statement.
|--- | -------------------------------------------------------------------------------------------------

|(3) | Incorporated by reference to Exhibit 10.11 to Registration Statement on Form S-2 (No. 333-110377) filed with the Commission on November 10, 2003 (the S-2
Registration Statement).
|--- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

|(4) | Incorporated by reference to Exhibit 10.12 to the above referenced S-2 Registration Statement.
|--- | ----------------------------------------------------------------------------------------------



E-2



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|(5) | Incorporated by reference to Exhibit 10.13 to the above referenced S-2 Registration Statement.
|--- | ----------------------------------------------------------------------------------------------

|(6) | Incorporated by reference to Exhibits 10.1 and 10.2, respectively, to a Current Report on Form 8-K dated April 6, 2007.
|--- | -----------------------------------------------------------------------------------------------------------------------

|(7) | Previously filed with the Annual Report on Form 10-K filed with the SEC on February 27, 2012, which is being amended hereby.
|--- | ----------------------------------------------------------------------------------------------------------------------------

|(8) | Previously furnished with the Annual Report on Form 10-K filed with the SEC on February 27, 2012, which is being amended hereby.
|--- | --------------------------------------------------------------------------------------------------------------------------------

|* | Filed herewith.
|- | ---------------

|** | Indicates management compensatory plan, contract, or arrangement.
|-- | -----------------------------------------------------------------

|*** | XBRL information is furnished and not filed or a part of a registration statement or prospectus for purposes of Sections 11 or 12 of the Securities Exchange Act of
1933, as amended, is deemed not filed for purposes of Section 18 of the Securities Exchange Act of 1934, as amended, and otherwise is not subject to liability under these sections.
|--- | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



E-3