UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549



FORM 10-K/A



ANNUAL REPORT PURSUANT TO SECTION 13 OR
15(d)

OF THE SECURITIES EXCHANGE ACT OF 1934



For the Fiscal Year Ended December 31,
2016



Commission File Number 0-19065



SANDY SPRING BANCORP, INC.

(Exact name of registrant as specified in
its charter)



|Maryland                                                                       |  | 52-1532952                                  
|------------------------------------------------------------------------------ |  | --------------------------------------------
|(State or
        other jurisdiction of
        incorporation or organization) |  | (I.R.S. Employer
        Identification No.)



|17801 Georgia Avenue, Olney, Maryland    |  | 20832     
|---------------------------------------- |  | ----------
|(Address of principal executive offices) |  | (Zip Code)



301-774-6400

(Registrant's telephone number, including
area code)



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

|Title of each class                     | Name of each exchange on which registered
|--------------------------------------- | -----------------------------------------
|Common Stock, par value $1.00 per share | The NASDAQ Stock Market, LLC             



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    x  No
| | ---------------



Indicate by check mark if the registrant is not required to
file reports pursuant to Section 13 or Section 15(d) of the Act.

| |  ̈  Yes    x  No*
| | ----------------



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.xYes ̈No



Indicate by check mark whether the registrant
has submitted electronically and posted on its corporate Website, if any, every Interactive Data File required to be submitted
and posted pursuant to Rule 405 of Regulation S-T during the preceding 12 months (or for shorter period that the registrant was
required to submit and post such files).    x  Yes     ̈  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.  x



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” and “smaller reporting company” in Rule 12b-2
of the Exchange Act (Check one):



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



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



The aggregate market value of the voting
common stock of the registrant held by non-affiliates on June 30, 2016, the last day of the registrant’s most recently completed
second fiscal quarter was approximately $682 million, based on the closing sales price of $29.06 per share of the registrant's
Common Stock on that date.



The number of outstanding shares of common
stock outstanding as of March 1, 2017.

Common stock, $1.00 par value –
23,919,354 shares



Documents Incorporated By Reference

Part III: Portions of the definitive proxy
statement for the Annual Meeting of Shareholders to be held on May 3, 2017 (the "Proxy
Statement").








* The registrant is required to file reports
pursuant to Section 13 of the Act.













Explanatory Statement to Form 10-K Amendment



This Amendment No. 1 (this “Amendment”)
amends the Annual Report on Form 10-K of Sandy Spring Bancorp, Inc. for the year ended December 31, 2016, filed with the Securities
Exchange Commission on March 3, 2017 (the “Original Form 10-K”). The purpose of this Amendment is to correct the date
on the signature page to the Original Form 10-K, which should read March 1, 2017 and not March 1, 2016.



In addition, as required by Rule 12b-15
under the Securities Act of 1934, as amended, new certifications by our principal executive officer and principal financial officer
are filed as exhibits to this Amendment under Item 15 of Part IV hereof.



This Amendment speaks as of the filing date
of our Original Form 10-K and has not been updated to reflect events occurring subsequent to the original filing date.

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PART IV.

Item 15. EXHIBITS, FINANCIAL STATEMENT
SCHEDULES



The following
financial statements are filed as a part of this report:



Consolidated Statements of Condition at
December 31, 2016 and 2015

Consolidated
Statements of Income for the years ended December 31, 2016, 2015 and 2014

Consolidated
Statements of Comprehensive Income for the years ended December 31, 2016, 2015 and 2014

Consolidated
Statements of Cash Flows for the years ended December 31, 2016, 2015 and 2014

Consolidated
Statements of Changes in Stockholders' Equity for the years ended December 31, 2016, 2015 and 2014

Notes to the
Consolidated Financial Statements

Reports of Registered Public Accounting
Firm



All financial statement schedules have
been omitted, as the required information is either not applicable or included in the Consolidated Financial Statements or related
Notes.



|Exhibit No. |  | Description                                                                                                                                                                                                                                                                                   |  | Incorporated by Reference to:                                                           
|----------- |  | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |  | ----------------------------------------------------------------------------------------
|3(a)        |  | Articles of Incorporation of Sandy Spring Bancorp, Inc., as amended                                                                                                                                                                                                                           |  | Exhibit 3.1 to Form 10-Q for the quarter
    ended June 30, 1996, SEC File No. 0-19065  
|3(b)        |  | Articles of Amendment to the Articles of Incorporation of Sandy Spring Bancorp, Inc.                                                                                                                                                                                                          |  | Exhibit 3(b) to Form 10-K for the year
    ended December 31, 2011, SEC File No. 0-19065
|3(c)        |  | Bylaws of Sandy Spring Bancorp, Inc.                                                                                                                                                                                                                                                          |  | Previously filed                                                                        
|4(a)        |  | No long-term debt instrument issued by the Company exceeds 10% of consolidated assets or is registered.  In accordance with paragraph 4(iii) of Item 601(b) of Regulation S-K, the Company will furnish the SEC copies of all long-term debt instruments and related agreements upon request. |  |                                                                                         
|10(a)*      |  | Sandy Spring Bancorp, Inc. 2005 Omnibus Stock Plan                                                                                                                                                                                                                                            |  | Exhibit 10.1 to Form 8-K dated June 27, 2005, SEC File No. 0-19065                      
|10(b)*      |  | Form of Director Fee Deferral Agreement, August 26, 1997, as amended                                                                                                                                                                                                                          |  | Exhibit 10(h) to Form 10-K for the year ended December 31, 2003, SEC File No. 0-19065   
|10(c)*      |  | Form of Amendment to Directors’ Fee Deferral Agreement                                                                                                                                                                                                                                        |  | Exhibit 10(o) to Form 10-K for the year ended December 31, 2008, SEC File No. 0-19065   
|10(d)*      |  | Sandy Spring Bank Directors’ Deferred Fee Plan                                                                                                                                                                                                                                                |  | Previously filed                                                                        
|10(e)*      |  | Employment Agreement by and among Sandy Spring Bancorp, Inc., Sandy Spring Bank, and Philip J. Mantua                                                                                                                                                                                         |  | Exhibit 10.1 to Form 8-K filed on January 17, 2012, SEC File No. 0-19065                
|10(f)*      |  | Employment Agreement by and among Sandy Spring Bancorp, Inc., Sandy Spring Bank, and Daniel J. Schrider                                                                                                                                                                                       |  | Exhibit 10(h) to Form 10-K for the year ended December 31, 2008, SEC File No. 0-19065   
|10(g)*      |  | Form of Sandy Spring National Bank of Maryland Officer Group Term Replacement Plan                                                                                                                                                                                                            |  | Exhibit 10(r) to Form 10-K for the year ended December 31, 2001, SEC File No. 0-19065   
|10(h)*      |  | Sandy Spring Bancorp, Inc. Directors’ Stock Purchase Plan                                                                                                                                                                                                                                     |  | Exhibit 4 to Registration Statement on Form S-8, File No. 333-166808                    
|10(i)*      |  | Sandy Spring Bank Executive Incentive Retirement Plan                                                                                                                                                                                                                                         |  | Exhibit 10(v) to Form 10-K for the year ended December 31, 2007, SEC File No. 0-19065   





3







|10(j)* |  | Sandy Spring Bancorp, Inc. 2011 Employee Stock Purchase Plan                                                                                                                                                                                                                                                                                                                                                                                                                             |  | Appendix A of the Definitive Proxy Statement filed on March 28, 2011, SEC File No. 0-19065 
|------ |  | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |  | -------------------------------------------------------------------------------------------
|10(k)* |  | Change in Control Agreement by and among Sandy Spring Bancorp, Inc., Sandy Spring Bank, and R. Louis  Caceres                                                                                                                                                                                                                                                                                                                                                                            |  | Exhibit 10(m) to Form 10-K for the year ended December 31, 2011, SEC File No. 0-19065      
|10(l)* |  | Employment Agreement by and among Sandy Spring Bancorp, Inc., Sandy Spring Bank, and Joseph J. O’Brien, Jr.                                                                                                                                                                                                                                                                                                                                                                              |  | Exhibit 10.2 to Form 8-K filed on January 17, 2012, SEC File No. 0-19065                   
|10(m)* |  | Second Amendment to Employment Agreement Between Sandy Spring Bancorp, Inc., Sandy Spring Bank and Daniel J. Schrider dated January 1, 2009                                                                                                                                                                                                                                                                                                                                              |  | Exhibit 10.1 to Form 8-K dated March 7, 2013, SEC File No. 0-19065                         
|10(n)* |  | Amendment to Employment Agreement Between Sandy Spring Bancorp, Inc., Sandy Spring Bank and Philip J. Mantua dated January 13, 2012                                                                                                                                                                                                                                                                                                                                                      |  | Exhibit 10.2 to Form 8-K dated March 7, 2013, SEC File No. 0-19065                         
|10(o)* |  | Amendment to Employment Agreement Between Sandy Spring Bancorp, Inc., Sandy Spring Bank and Joseph J. O’Brien, Jr. dated January 13, 2012                                                                                                                                                                                                                                                                                                                                                |  | Exhibit 10.3 to Form 8-K dated March 7, 2013, SEC File No. 0-19065                         
|10(p)* |  | Amendment to Change in Control Agreement Between Sandy Spring Bancorp, Inc., Sandy Spring Bank and R. Louis Caceres dated March 9, 2012                                                                                                                                                                                                                                                                                                                                                  |  | Exhibit 10.4 to Form 8-K dated March 7, 2013, SEC File No. 0-19065                         
|10(q)* |  | Change in Control Agreement Between Sandy Spring Bancorp, Inc., Sandy Spring Bank and Ronald E. Kuykendall dated March 7, 2013                                                                                                                                                                                                                                                                                                                                                           |  | Exhibit 10(t) to Form 10-K for the year ended December 31, 2013, SEC File No. 0-19065      
|10(r)* |  | Sandy Spring Bancorp, Inc. 2015 Omnibus Incentive Plan                                                                                                                                                                                                                                                                                                                                                                                                                                   |  | Appendix A of the Definitive Proxy Statement filed on March 31, 2015,  SEC File No. 0-19065
|21     |  | Subsidiaries                                                                                                                                                                                                                                                                                                                                                                                                                                                                             |  | Previously filed                                                                           
|23(a)  |  | Consent of Ernst and Young LLP                                                                                                                                                                                                                                                                                                                                                                                                                                                           |  | Previously filed                                                                           
|31(a)  |  | Rule 13a-14(a)/15d-14(a) Certification                                                                                                                                                                                                                                                                                                                                                                                                                                                   |  |                                                                                            
|31(b)  |  | Rule 13a-14(a)/15d-14(a) Certification                                                                                                                                                                                                                                                                                                                                                                                                                                                   |  |                                                                                            
|32(a)  |  | 18 U.S.C. Section 1350 Certification                                                                                                                                                                                                                                                                                                                                                                                                                                                     |  |                                                                                            
|32(b)  |  | 18 U.S.C. Section 1350 Certification                                                                                                                                                                                                                                                                                                                                                                                                                                                     |  |                                                                                            
|101    |  | The following materials from the Sandy Spring Bancorp, Inc. Annual Report on Form 10-K for the year ended December 31, 2016 formatted in Extensible Business Reporting Language (XBRL): (i) the Consolidated Statements of Condition; (ii) the Consolidated Statements of Income; (iii) the Consolidated Statements of Comprehensive Income; (iv) the Consolidated Statements of Cash Flows; (v) the Consolidated Statements of Changes in Stockholders’ Equity; and (vi) related notes. |  |                                                                                            

* Management Contract
or Compensatory Plan or Arrangement filed pursuant to Item 15(b) of this Report.



Shareholders may obtain, upon payment of a reasonable fee, a
copy of the exhibits to this Report on Form 10-K by writing Ronald E. Kuykendall, General Counsel and Secretary, at Sandy Spring
Bancorp, Inc., 17801 Georgia Avenue, Olney, Maryland 20832. Shareholders also may access a copy of the Form 10-K including exhibits
on the SEC Web site at www.sec.gov or through the Company’s Investor Relations Web site maintained at www.sandyspringbank.com.





4









SIGNATURES

Pursuant
to the requirements of Section 13 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.





|SANDY SPRING BANCORP, INC.
|--------------------------
|(Registrant)              
|                          
|By:                       
|                          
|                          



Pursuant to the requirements of the Securities
Exchange Act of 1934, this report has been signed below by the following persons on behalf of the registrant and in the capacities
indicated as of March 1, 2017.



|Principal Executive Officer and Director: |           | Principal Financial and Accounting Officer:          | 
|----------------------------------------- | --------- | ---------------------------------------------------- | 
|/s/ Daniel J. Schrider                    |           | /s/ Philip J. Mantua                                 | 
|Daniel J. Schrider                        |           | Philip J. Mantua                                     | 
|President and Chief Executive Officer     |           | Executive Vice President and Chief Financial Officer | 
|                                          |           |                                                      | 
|                                          | Signature |                                                      | 
|                                          |           |                                                      | 
|/s/ Mona Abutaleb                         |           |                                                      | 
|Mona Abutaleb                             |           |                                                      | 
|                                          |           |                                                      | 
|/s/ Ralph F. Boyd, Jr.                    |           |                                                      | 
|Ralph F. Boyd, Jr.                        |           |                                                      | 
|                                          |           |                                                      | 
|/s/ Mark E. Friis                         |           |                                                      | 
|Mark E. Friis                             |           |                                                      | 
|                                          |           |                                                      | 
|/s/ Susan D. Goff                         |           |                                                      | 
|Susan D. Goff                             |           |                                                      | 
|                                          |           |                                                      | 
|/s/ Robert E. Henel, Jr.                  |           |                                                      | 
|Robert E. Henel, Jr.                      |           |                                                      | 
|                                          |           |                                                      | 
|/s/ Pamela A. Little                      |           |                                                      | 
|Pamela A. Little                          |           |                                                      | 
|                                          |           |                                                      | 
|/s/ James J. Maiwurm                      |           |                                                      | 
|James J. Maiwurm                          |           |                                                      | 
|                                          |           |                                                      | 
|/s/ Gary G. Nakamoto                      |           |                                                      | 
|Gary G. Nakamoto                          |           |                                                      | 
|                                          |           |                                                      | 
|/s/ Robert L. Orndorff                    |           |                                                      | 
|Robert L. Orndorff                        |           |                                                      | 
|                                          |           |                                                      | 
|/s/ Craig A. Ruppert                      |           |                                                      | 
|Craig A. Ruppert                          |           |                                                      | 
|                                          |           |                                                      | 
|/s/ Dennis A. Starliper                   |           |                                                      | 
|Dennis A. Starliper                       |           |                                                      | 
|                                          |           |                                                      | 





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