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, 2015

Commission File Number 0-19065

SANDY SPRING BANCORP, INC.

(Exact name of registrant as specified in its charter)

301-774-6400

(Registrant's telephone number, including area code)

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

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. x Yes  ¨ 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, 2015, the last day of the registrant’s most recently completed second fiscal quarter was approximately $653 million, based on the closing sales price of $27.26 per share of the registrant's Common Stock on that date.

The number of outstanding shares of common stock outstanding as of March 1, 2016.

Common stock, $1.00 par value – 23,818,385 shares

Documents Incorporated By Reference

Part III: Portions of the definitive proxy statement for the Annual Meeting of Shareholders to be held on May 4, 2016 (the "Proxy Statement").

_______________________

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

Explanatory Note

This Amendment No. 1 to Form 10-K (this “Amendment”) amends the Annual Report on Form 10-K for the fiscal year ended December 31, 2015, originally filed with the Securities and Exchange Commission (the “SEC”) on March 4, 2016 (the “Form 10-K”), by Sandy Spring Bancorp, Inc. (the “Company”). The sole purpose of this Amendment is to re-file Exhibit 23(a), which was inadvertently filed without the signature of the independent registered public accounting firm.

In addition, as required by Rule 12b-15 under the Securities Exchange Act of 1934, as amended, new certifications by the Company’s principal executive officer and principal financial officer are filed as exhibits to this Amendment.

No changes have been made in this Amendment to modify or update the other disclosures presented in the Form 10-K. This Amendment does not reflect events occurring after the filing of the Form 10-K or modify or update those disclosures that may be affected by subsequent events. This Amendment should be read in conjunction with the Form 10-K and the Company’s other filings made with the SEC.

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.