UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

Form 10-K/A

Amendment No. 1

(Mark One)

For the fiscal year ended January 31, 2015

OR

For the transition period from                      to                      

Commission File Number: 001- 36069

VIOLIN MEMORY, INC.

(Exact Name of Registrant as Specified in Its Charter)

Registrant’s telephone number, including area code: (650) 396-1500

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 or Section 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 (§232.405 of this chapter) is not contained herein, and will not be contained, to the best of the 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 definition of “large accelerated filer,” “accelerated filer” and “smaller reporting company” in Rule 12b-2 of the Exchange Act. (Check one):

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

The aggregate market value of voting stock held by non-affiliates of the registrant on July 31, 2014, based on the closing price of $3.96 for shares of the registrant’s common stock as reported by the New York Stock Exchange, was approximately $363,862,216. Shares of common stock held by each executive officer, director, and holder of 5% or more of the outstanding common stock have been excluded in that such persons may be deemed to be affiliates. This determination of affiliate status is not necessarily a conclusive determination for other purposes.

As of March 31, 2015, there were 95,789,619 shares of the registrant’s common stock outstanding.

EXPLANATORY NOTE

Violin Memory, Inc. is filing this Amendment No. 1 to its Annual Report on Form 10-K for the fiscal year ended January 31, 2015, as an exhibit-only filing solely to re-file Exhibits 31.1 and 31.2 to include a portion of the text required in paragraph 4 of the Section 302 certifications (specifically, subparagraph 4(b) and a portion of the introductory language of paragraph 4), which were inadvertently omitted from the Section 302 certifications included with the original Form 10-K filed with the Securities and Exchange Commission on April 8, 2015. This Amendment No. 1 to Form 10-K does not reflect events occurring after the filing of the original Form 10-K and, other than the re-filing of the referenced certifications, does not modify or update the disclosures in the original Form 10-K in any way.

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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 Amendment No. 1 to its Annual Report on Form 10-K to be signed on its behalf by the undersigned, thereunto duly authorized on January 5, 2016.

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EXHIBIT INDEX

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