UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, D. C. 20549

Amendment NO. 1 TO

FORM 10-Q

☒     QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE

SECURITIES EXCHANGE ACT OF 1934

For the quarterly period ended: November 30, 2011

OR

☐     TRANSITION REPORT PURSUANT TO SECTION 13 AND 15(d) OF THE

SECURITES EXCHANGE ACT OF 1934

Commission file: No. 33-94644

MINN-DAK FARMERS COOPERATIVE

(Exact named of Registrant as specified in its charter)

(701) 642-8411

(Registrant’s telephone number, including area code)

Not Applicable

(Former name, former address and former fiscal year,

if changed since last report)

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, and (2) has been subject to such filing requirements for the past 90 days.

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 during the preceding 12 months.

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 the definitions of “large accelerated filer,” “accelerated filer” and “smaller reporting company” in Rule 12b-2 of the Exchange Act.

Large Accelerated Filer ☐     Accelerated Filer ☐     Non-Accelerated Filer ☒     Smaller Reporting Co ☐

Indicate by check mark whether the Registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act).

Indicate the number of shares outstanding of each of the issuer’s classes of common stock, as of the latest practicable date.

EXPLANATORY NOTE

On January 12, 2012, Minn-Dak Farmers Cooperative (the “Company”) filed its Quarterly Report on Form 10-Q for the quarter ended November 30, 2011. This Amendment No. 1 to Form 10-Q amends the Quarterly Report on Form 10-Q for the period ended November 30, 2011, as filed with the Securities and Exchange Commission, and is for the sole purpose of furnishing the Interactive Data Files as Exhibit 101 in accordance with Rule 405 of Regulation S-T. Exhibit 101 provides the financial statements and related notes from the Form 10-Q formatted in Extensible Business Reporting Language (XBRL).

No other changes have been made to the Form 10-Q other than furnishing the exhibit described above. This Amendment No. 1 to the Form 10-Q continues to speak of the original filing date of the Form 10-Q, does not reflect events that may have occurred subsequent to the original filing date, and does not modify or update in any way disclosures made in the original Form 10-Q.

Item 6. Exhibits

The following exhibits are furnished herewith or incorporated herein pursuant to Regulation S-K, Item 601:

SIGNATURES

Pursuant to the requirement 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.