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| x | Annual report pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 |
|---|-------------------------------------------------------------------------------------------|

|  ̈ | Transition report pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 |
|--------|-----------------------------------------------------------------------------------------------|

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|                                                          |         |                                   |
|---------------------------------------------------------------|--------------|----------------------------------------|
| Washington                                                    |    | 91-1405022                             |
| (State or other jurisdictionof incorporation or organization) |    | (I.R.S. EmployerIdentification Number) |

| Title of Each Class           |    | Name of Each Exchange on Which Registered |
|-------------------------------|--------------|-------------------------------------------|
| Common Stock, $0.01 par value |    | Nasdaq Global Select Market               |

|                                                                                   |         |                                         |
|----------------------------------------------------------------------------------------|--------------|----------------------------------------------|
| Large accelerated filer    ̈                                             |    | Accelerated filer   x              |
| Non-accelerated filer    ̈ (Do not check if a smaller reporting company) |    | Smaller reporting company    ̈ |

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| ·   | amend and restate the cover page of the Form 10-K in order to correct the name of the exchange on which, and the section of the Act pursuant to which, the registrant’s Common Stock, $0.01 par value, is registered; and |
|--------------------|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|

| ·   | amend and restate the Exhibit Index incorporated by reference in Item 15(a)(3) in order to correct the footnotes to Exhibits 1.1, 3.1, 3.2, 4.1, 10.2, 10.4, 10.6, 10.16 and 10.17 indicating the filings thereof from which such exhibits are incorporated by reference and, for Exhibits 10.13 and 10.20, the description and exhibit number, respectively, related to the filing thereof from which such exhibits are incorporated by reference. |
|--------------------|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|

| ·   | 31.3 Certification of Principal Executive Officer pursuant to Section 302 of the Sarbanes-Oxley Act of 2002; |
|--------------------|--------------------------------------------------------------------------------------------------------------|

| ·   | 31.4 Certification of Principal Financial Officer pursuant to Section 302 of the Sarbanes-Oxley Act of 2002; |
|--------------------|--------------------------------------------------------------------------------------------------------------|

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

| ExhibitNo.         |   | Description                                                                                                                                                                             |
|--------------------|--------|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
|   1.1(K) |   | Underwriting Agreement between J.P. Morgan Securities Inc. and the registrant dated July 10, 2007 (exhibit 1.1)                                                               |
|               |   |
|   2.1(R) |   | Share Purchase Agreement dated May 26, 2010 by and among SonoSite, Inc., VisualSonics, Inc., the Shareholders of VisualSonics, Inc. and the Shareholders’ Agent (exhibit 2.1)     |
|               |   |
|   3.1(U) |   | Restated Articles of Incorporation of the registrant (exhibit 3.1)                                                                                                                 |
|               |   |
|   3.2(A) |   | Amended and Restated Bylaws of the registrant (exhibit 3.1)                                                                                                                        |
|               |   |
|   4.1(K) |   | First Supplemental Indenture between Wells Fargo Bank, NA and the registrant dated July 16, 2007 (exhibit 4.1)                                                                |
|               |   |
|   4.2(M) |   | Amended and Restated Rights Agreement dated November 28, 2007 by and between the registrant and Computershare Trust Company N.A. (exhibit 4.1)                                |
|               |   |
|   4.3(M) |   | Form of Rights Certificate (exhibit 4.2)                                                                                                                                           |
|               |   |
| 10.1(F)            |   | 1998 Stock Option Plan, as amended and restated (exhibit 10.1)                                                                                                                     |
|               |   |
| 10.2(U)            |   | Terms of Stock Option Grant Program for Nonemployee Directors under the SonoSite, Inc. 1998 Stock Option Plan (exhibit 10.2)                                                       |
|               |   |
| 10.3(G)            |   | 1998 Nonofficer Employee Stock Option Plan, as amended and restated (exhibit 10.1)                                                                                                 |
|               |   |
| 10.4(D)            |   | Nonemployee Director Stock Option Plan, as amended and restated (exhibit 10.3)                                                                                                     |
|               |   |
| 10.5(B)            |   | Management Incentive Compensation Plan (exhibit 10.5)                                                                                                                              |
|               |   |
| 10.6(U)            |   | Technology Transfer and License Agreement between ATL Ultrasound, Inc. and the registrant, effective as of April 6, 1998, as amended (exhibit 10.9)                           |
|               |   |
| 10.7(E)            |   | Third Amendment to Technology Transfer and License Agreement between ATL Ultrasound, Inc. and the registrant, dated as of March 10, 2000 (exhibit 10.9)                            |
|               |   |
| 10.8(C)            |   | Option Notice Agreement, dated July 17, 2000, between the registrant and Michael J. Schuh (exhibit 99.1)                                                                      |
|               |   |
| 10.9(H)            |   | 2005 Employee Stock Purchase Plan (exhibit 10.2)                                                                                                                                   |
|               |   |
| 10.10(I)           |   | 1998 Stock Option Plan Stock Option Award Agreement (exhibit 10.1)                                                                                                                 |
|               |   |
| 10.11(J)           |   | Terms of Stock Option Grant Program for Nonemployee Directors under the SonoSite, Inc. 2005 Stock Incentive Plan (exhibit 10.1)                                                    |
|               |   |
| 10.12(J)           |   | 2005 Stock Incentive Plan Stock Option Agreement (Non Statutory) (exhibit 10.2)                                                                                                    |
|               |   |
| 10.13(J)           |   | 2005 Stock Incentive Plan Restricted Stock Unit Agreement (exhibit 10.3)                                                                                                           |
|               |   |
| 10.14(L)           |   | Call Option Transaction Confirmation, dated as of July 11, 2007, by and between SonoSite, Inc. and JPMorgan Chase Bank, National Association (exhibit 10.1)                        |
|               |   |
| 10.15(L)           |   | Warrant Transaction Confirmation, dated as of July 11, 2007, by and between SonoSite, Inc. and JPMorgan Chase Bank, National Association (exhibit 10.2)                       |
|               |   |
| 10.16(V)           |   | Form of Partial Unwind Agreement with respect to the Note Hedge Transaction Confirmation dated July 11, 2007, by and between SonoSite, Inc. and JP Morgan Chase Bank, NA (exhibit 10.1) |
|               |   |
| 10.17(V)           |   | Form of Partial Unwind Agreement with respect to the Warrant Confirmation dated July 11, 2007, by and between SonoSite, Inc. and JPMorgan Chase Bank, NA (exhibit 10.2)                 |
|               |   |
| 10.18(N)           |   | Amended and Restated 2005 Stock Incentive Plan (exhibit 99.1)                                                                                                                           |

|        |   |                                                                                                                                            |
|-------------|--------|-------------------------------------------------------------------------------------------------------------------------------------------------|
| 10.19(O)    |   | FY2010 Variable Incentive Bonus Plan (exhibit 10.1)                                                                                             |
|        |   |
| 10.20(P)    |   | Form of Senior Management Employment Agreement by and between SonoSite, Inc. and each of its Named Executive Officers (exhibit 10.20)           |
|        |   |
| 10.21(Q)    |   | Form of Indemnification Agreement by and between SonoSite, Inc. and each of its Named Executive Officers (exhibit 10.21)                        |
|        |   |
| 10.22(S)*   |   | Confidential Settlement and License Agreement dated October 16, 2009 by and between SonoSite, Inc. and General Electric Company (exhibit 10.22) |
|        |   |
| 10.23(T)    |   | Separation Agreement and General Release dated January 14, 2011 by and between SonoSite, Inc. and Michael Schuh (exhibit 10.1)                  |
|        |   |
| 21.1**      |   | Subsidiaries of the registrant                                                                                                                  |
|        |   |
| 23.1**      |   | Consent of KPMG LLP, independent registered public accounting firm                                                                              |
|        |   |
| 24.1**      |   | Power of attorney (contained on signature page)                                                                                                 |
|        |   |
| 31.1**      |   | Certification of Principal Executive Officer pursuant to Section 302 of the Sarbanes-Oxley Act of 2002                                     |
|        |   |
| 31.2**      |   | Certification of Principal Financial Officer pursuant to Section 302 of the Sarbanes-Oxley Act of 2002                                     |
|        |   |
| 31.3† |   | Certification of Principal Executive Officer pursuant to Section 302 of the Sarbanes-Oxley Act of 2002                                     |
|        |   |
| 31.4† |   | Certification of Principal Financial Officer pursuant to Section 302 of the Sarbanes-Oxley Act of 2002                                     |
|        |   |
| 32.1**      |   | Certification of Principal Executive Officer pursuant to 18 U.S.C. Section 1350 (Section 906 of the Sarbanes-Oxley Act of 2002)  |
|        |   |
| 32.2**      |   | Certification of Principal Financial Officer pursuant to 18 U.S.C. Section 1350 (Section 906 of the Sarbanes-Oxley Act of 2002)  |

| † | Filed herewith.                                                                                                                                                                             |
|---------|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| *       | Confidential treatment requested.                                                                                                                                                           |
| **      | Previously filed.                                                                                                                                                                           |
| (A)     | Incorporated by reference to the designated exhibit included in SonoSite’s report on Form 10-Q filed on November 9, 2010.                                                        |
| (B)     | Incorporated by reference to the designated exhibit included in SonoSite’s report on Form 10-K for the year ended December 31, 1998 filed on March 22, 1999.           |
| (C)     | Incorporated by reference to the designated exhibit included in SonoSite’s registration statement on Form S-8 (Registration No. 333-51820) filed on December 14, 2000. |
| (D)     | Incorporated by reference to the designated exhibit included in SonoSite’s report on Form 8-K filed on February 7, 2006.                                                         |
| (E)     | Incorporated by reference to the designated exhibit included in SonoSite’s report on Form 10-K for the year ended December 31, 2001 filed on February 22, 2002.        |
| (F)     | Incorporated by reference to the designated exhibit included in SonoSite’s report on Form 10-Q for the quarter ended March 31, 2002 filed on May 13, 2002.             |
| (G)     | Incorporated by reference to the designated exhibit included in SonoSite’s report on Form 10-Q for the quarter ended June 30, 2002 filed on August 13, 2002.           |
| (H)     | Incorporated by reference to the designated exhibit included in SonoSite’s report on Form 8-K filed on April 28, 2005.                                                      |
| (I)     | Incorporated by reference to the designated exhibit included in SonoSite’s report on Form 10-Q for the quarter ended June 30, 2005 filed on August 9, 2005.            |
| (J)     | Incorporated by reference to the designated exhibit included in SonoSite’s report on Form 8-K filed on February 7, 2006.                                                    |
| (K)     | Incorporated by reference to the designated exhibit included in SonoSite’s report on Form 8-K filed on July 16, 2007.                                                       |
| (L)     | Incorporated by reference to the designated exhibit included in SonoSite’s report on Form 10-Q filed on August 9, 2007.                                                     |

| (M) | Incorporated by reference to the designated exhibit included in SonoSite’s report on Form 8-K filed on November 29, 2007.                                     |
|-----|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| (N) | Incorporated by reference to the designated exhibit included in SonoSite’s registration statement on Form S-8 filed on May 2, 2008.                           |
| (O) | Incorporated by reference to the designated exhibit included in SonoSite’s report on Form 10-Q for the quarter ended March 31, 2010 and filed on May 7, 2010. |
| (P) | Incorporated by reference to the designated exhibit included in SonoSite’s report on Form 10-K filed on March 12, 2009.                                            |
| (Q) | Incorporated by reference to the designated exhibit included in SonoSite’s report on Form 10-K filed on March 26, 2010.                                                 |
| (R) | Incorporated by reference to the designated exhibit included in SonoSite’s report on Form 8-K/A filed on December 7, 2010.                                              |
| (S) | Incorporated by reference to the designated exhibit included in SonoSite’s report on Form 10-K/A filed on September 7, 2010.                                            |
| (T) | Incorporated by reference to the designated exhibit included in SonoSite’s report on Form 8-K filed on January 18, 2011.                                                |
| (U) | Incorporated by reference to the designated exhibit included in SonoSite’s Registration Statement on Form S-1 (Registration No. 333-714157) filed on March 10, 1999.    |
| (V) | Incorporated by reference to the designated exhibit included in SonoSite’s report on Form 8-K filed on November 2, 2008.                                                |

|   |                   |                                                             |
|--------|------------------------|------------------------------------------------------------------|
|   |                   |  SONOSITE, INC.                                             |
|   |                   |
|   |   By    |  /s/ Marcus Y. Smith                                        |
|   |                   | Marcus Y. SmithSenior Vice President and Chief Financial Officer |

| ExhibitNo.         |   | Description                                                                                                                                                                             |
|--------------------|--------|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
|   1.1(K) |   | Underwriting Agreement between J.P. Morgan Securities Inc. and the registrant dated July 10, 2007 (exhibit 1.1)                                                               |
|               |   |
|   2.1(R) |   | Share Purchase Agreement dated May 26, 2010 by and among SonoSite, Inc., VisualSonics, Inc., the Shareholders of VisualSonics, Inc. and the Shareholders’ Agent (exhibit 2.1)     |
|               |   |
|   3.1(U) |   | Restated Articles of Incorporation of the registrant (exhibit 3.1)                                                                                                                 |
|               |   |
|   3.2(A) |   | Amended and Restated Bylaws of the registrant (exhibit 3.1)                                                                                                                        |
|               |   |
|   4.1(K) |   | First Supplemental Indenture between Wells Fargo Bank, NA and the registrant dated July 16, 2007 (exhibit 4.1)                                                                |
|               |   |
|   4.2(M) |   | Amended and Restated Rights Agreement dated November 28, 2007 by and between the registrant and Computershare Trust Company N.A. (exhibit 4.1)                                |
|               |   |
|   4.3(M) |   | Form of Rights Certificate (exhibit 4.2)                                                                                                                                           |
|               |   |
| 10.1(F)            |   | 1998 Stock Option Plan, as amended and restated (exhibit 10.1)                                                                                                                     |
|               |   |
| 10.2(U)            |   | Terms of Stock Option Grant Program for Nonemployee Directors under the SonoSite, Inc. 1998 Stock Option Plan (exhibit 10.2)                                                       |
|               |   |
| 10.3(G)            |   | 1998 Nonofficer Employee Stock Option Plan, as amended and restated (exhibit 10.1)                                                                                                 |
|               |   |
| 10.4(D)            |   | Nonemployee Director Stock Option Plan, as amended and restated (exhibit 10.3)                                                                                                     |
|               |   |
| 10.5(B)            |   | Management Incentive Compensation Plan (exhibit 10.5)                                                                                                                              |
|               |   |
| 10.6(U)            |   | Technology Transfer and License Agreement between ATL Ultrasound, Inc. and the registrant, effective as of April 6, 1998, as amended (exhibit 10.9)                           |
|               |   |
| 10.7(E)            |   | Third Amendment to Technology Transfer and License Agreement between ATL Ultrasound, Inc. and the registrant, dated as of March 10, 2000 (exhibit 10.9)                            |
|               |   |
| 10.8(C)            |   | Option Notice Agreement, dated July 17, 2000, between the registrant and Michael J. Schuh (exhibit 99.1)                                                                      |
|               |   |
| 10.9(H)            |   | 2005 Employee Stock Purchase Plan (exhibit 10.2)                                                                                                                                   |
|               |   |
| 10.10(I)           |   | 1998 Stock Option Plan Stock Option Award Agreement (exhibit 10.1)                                                                                                                 |
|               |   |
| 10.11(J)           |   | Terms of Stock Option Grant Program for Nonemployee Directors under the SonoSite, Inc. 2005 Stock Incentive Plan (exhibit 10.1)                                                    |
|               |   |
| 10.12(J)           |   | 2005 Stock Incentive Plan Stock Option Agreement (Non Statutory) (exhibit 10.2)                                                                                                    |
|               |   |
| 10.13(J)           |   | 2005 Stock Incentive Plan Restricted Stock Unit Agreement (exhibit 10.3)                                                                                                           |
|               |   |
| 10.14(L)           |   | Call Option Transaction Confirmation, dated as of July 11, 2007, by and between SonoSite, Inc. and JPMorgan Chase Bank, National Association (exhibit 10.1)                        |
|               |   |
| 10.15(L)           |   | Warrant Transaction Confirmation, dated as of July 11, 2007, by and between SonoSite, Inc. and JPMorgan Chase Bank, National Association (exhibit 10.2)                       |
|               |   |
| 10.16(V)           |   | Form of Partial Unwind Agreement with respect to the Note Hedge Transaction Confirmation dated July 11, 2007, by and between SonoSite, Inc. and JP Morgan Chase Bank, NA (exhibit 10.1) |
|               |   |
| 10.17(V)           |   | Form of Partial Unwind Agreement with respect to the Warrant Confirmation dated July 11, 2007, by and between SonoSite, Inc. and JPMorgan Chase Bank, NA (exhibit 10.2)                 |
|               |   |
| 10.18(N)           |   | Amended and Restated 2005 Stock Incentive Plan (exhibit 99.1)                                                                                                                           |

|        |   |                                                                                                                                            |
|-------------|--------|-------------------------------------------------------------------------------------------------------------------------------------------------|
| 10.19(O)    |   | FY2010 Variable Incentive Bonus Plan (exhibit 10.1)                                                                                             |
|        |   |
| 10.20(P)    |   | Form of Senior Management Employment Agreement by and between SonoSite, Inc. and each of its Named Executive Officers (exhibit 10.20)           |
|        |   |
| 10.21(Q)    |   | Form of Indemnification Agreement by and between SonoSite, Inc. and each of its Named Executive Officers (exhibit 10.21)                        |
|        |   |
| 10.22(S)*   |   | Confidential Settlement and License Agreement dated October 16, 2009 by and between SonoSite, Inc. and General Electric Company (exhibit 10.22) |
|        |   |
| 10.23(T)    |   | Separation Agreement and General Release dated January 14, 2011 by and between SonoSite, Inc. and Michael Schuh (exhibit 10.1)                  |
|        |   |
| 21.1**      |   | Subsidiaries of the registrant                                                                                                                  |
|        |   |
| 23.1**      |   | Consent of KPMG LLP, independent registered public accounting firm                                                                              |
|        |   |
| 24.1**      |   | Power of attorney (contained on signature page)                                                                                                 |
|        |   |
| 31.1**      |   | Certification of Principal Executive Officer pursuant to Section 302 of the Sarbanes-Oxley Act of 2002                                     |
|        |   |
| 31.2**      |   | Certification of Principal Financial Officer pursuant to Section 302 of the Sarbanes-Oxley Act of 2002                                     |
|        |   |
| 31.3† |   | Certification of Principal Executive Officer pursuant to Section 302 of the Sarbanes-Oxley Act of 2002                                     |
|        |   |
| 31.4† |   | Certification of Principal Financial Officer pursuant to Section 302 of the Sarbanes-Oxley Act of 2002                                     |
|        |   |
| 32.1**      |   | Certification of Principal Executive Officer pursuant to 18 U.S.C. Section 1350 (Section 906 of the Sarbanes-Oxley Act of 2002)  |
|        |   |
| 32.2**      |   | Certification of Principal Financial Officer pursuant to 18 U.S.C. Section 1350 (Section 906 of the Sarbanes-Oxley Act of 2002)  |

| † | Filed herewith.                                                                                                                                                                             |
|---------|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| *       | Confidential treatment requested.                                                                                                                                                           |
| **      | Previously filed.                                                                                                                                                                           |
| (A)     | Incorporated by reference to the designated exhibit included in SonoSite’s report on Form 10-Q filed on November 9, 2010.                                                        |
| (B)     | Incorporated by reference to the designated exhibit included in SonoSite’s report on Form 10-K for the year ended December 31, 1998 filed on March 22, 1999.           |
| (C)     | Incorporated by reference to the designated exhibit included in SonoSite’s registration statement on Form S-8 (Registration No. 333-51820) filed on December 14, 2000. |
| (D)     | Incorporated by reference to the designated exhibit included in SonoSite’s report on Form 8-K filed on February 7, 2006.                                                         |
| (E)     | Incorporated by reference to the designated exhibit included in SonoSite’s report on Form 10-K for the year ended December 31, 2001 filed on February 22, 2002.        |
| (F)     | Incorporated by reference to the designated exhibit included in SonoSite’s report on Form 10-Q for the quarter ended March 31, 2002 filed on May 13, 2002.             |
| (G)     | Incorporated by reference to the designated exhibit included in SonoSite’s report on Form 10-Q for the quarter ended June 30, 2002 filed on August 13, 2002.           |
| (H)     | Incorporated by reference to the designated exhibit included in SonoSite’s report on Form 8-K filed on April 28, 2005.                                                      |
| (I)     | Incorporated by reference to the designated exhibit included in SonoSite’s report on Form 10-Q for the quarter ended June 30, 2005 filed on August 9, 2005.            |
| (J)     | Incorporated by reference to the designated exhibit included in SonoSite’s report on Form 8-K filed on February 7, 2006.                                                    |
| (K)     | Incorporated by reference to the designated exhibit included in SonoSite’s report on Form 8-K filed on July 16, 2007.                                                       |
| (L)     | Incorporated by reference to the designated exhibit included in SonoSite’s report on Form 10-Q filed on August 9, 2007.                                                     |

| (M) | Incorporated by reference to the designated exhibit included in SonoSite’s report on Form 8-K filed on November 29, 2007.                                     |
|-----|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| (N) | Incorporated by reference to the designated exhibit included in SonoSite’s registration statement on Form S-8 filed on May 2, 2008.                           |
| (O) | Incorporated by reference to the designated exhibit included in SonoSite’s report on Form 10-Q for the quarter ended March 31, 2010 and filed on May 7, 2010. |
| (P) | Incorporated by reference to the designated exhibit included in SonoSite’s report on Form 10-K filed on March 12, 2009.                                            |
| (Q) | Incorporated by reference to the designated exhibit included in SonoSite’s report on Form 10-K filed on March 26, 2010.                                                 |
| (R) | Incorporated by reference to the designated exhibit included in SonoSite’s report on Form 8-K/A filed on December 7, 2010.                                              |
| (S) | Incorporated by reference to the designated exhibit included in SonoSite’s report on Form 10-K/A filed on September 7, 2010.                                            |
| (T) | Incorporated by reference to the designated exhibit included in SonoSite’s report on Form 8-K filed on January 18, 2011.                                                |
| (U) | Incorporated by reference to the designated exhibit included in SonoSite’s Registration Statement on Form S-1 (Registration No. 333-714157) filed on March 10, 1999.    |
| (V) | Incorporated by reference to the designated exhibit included in SonoSite’s report on Form 8-K filed on November 2, 2008.                                                |