UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
WASHINGTON, D.C. 20549

FORM 8-K

CURRENT REPORT
PURSUANT TO SECTION 13 OR 15(d) OF THE
SECURITIES EXCHANGE ACT OF 1934

Date of Report (Date of earliest event reported): November 10, 2015

SUNOPTA INC.
(Exact name of registrant as specified in its charter)

2838 Bovaird Drive West
Brampton, Ontario, L7A 0H2, Canada
(Address of Principal Executive Offices)

(905) 455-1990
(Registrant's telephone number, including area code)

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:

On November 10, 2015, the Board of Directors (the “Board”) of SunOpta Inc. (the “Company”) adopted a shareholder rights plan (the "Rights Plan") effective November 10, 2015. The terms of the Rights Plan are contained in a shareholder rights plan agreement (the "Rights Plan Agreement") dated as of November 10, 2015 between the Company and American Stock Transfer & Trust Company, LLC, as rights agent.

The Rights Plan is intended to provide the Board with additional time, in the event of an unsolicited take-over bid, to develop and propose alternatives to the bid and negotiate with the bidder, as well as to ensure equal treatment of shareholders in the context of an acquisition of control made other than by way of an offer to all shareholders, and lessen the pressure on shareholders to tender to a bid. The Rights Plan is not intended to prevent a change of control of the Company to the detriment of shareholders. The Rights Plan has not been adopted in response to, or in anticipation of, any known or anticipated take-over bid or proposal to acquire control of SunOpta.

The Rights Plan became effective on November 10, 2015, and the Toronto Stock Exchange has accepted notice of filing of the Rights Plan on condition that the Rights Plan be ratified by the Company’s shareholders within six months of the effective date. The Board approved the Rights Plan on November 10, 2015, authorizing the issue of one Right in respect of each outstanding common share ("Common Share") of the Company to holders of record as at 5:30 p.m. (Toronto Time) on November 23, 2015 (the "Record Time") and each Common Share issued after the Record Time and prior to the earlier of the Separation Time (as defined below) and the Expiration Time (as defined in the Rights Plan).

The Company entered into the Rights Plan Agreement with American Stock Transfer & Trust Company, LLC, as rights agent, to act in connection with the exercise of the rights (the "Rights") issued under the Rights Plan, the issue of certificates evidencing the Rights and other related matters.

The principal terms and conditions of the Rights Plan are summarized below.

Term

The Rights Plan is in effect from and after November 10, 2015 with a record date for the issuance of the Rights of November 23, 2015. The Company intends to submit the Rights Plan for ratification by shareholders at its upcoming 2016 annual and special shareholders' meeting, which will be held not later than six months from November 10, 2015. If the Rights Plan is not ratified by a resolution passed by a majority of the independent shareholders of the Company at a meeting held within six months of the adoption of the Rights Plan, then the Rights Plan and any outstanding Rights will be terminated. If the Rights Plan is ratified by the independent shareholders of the Company, then the Rights Plan and any outstanding Rights will continue in effect until the third annual meeting of shareholders of the Company following the meeting at which the Rights Plan was ratified.

Issue of Rights

The Company will issue one Right in respect of each Common Share to holders of record as at the Record Time. One Right will be issued in respect of each Common Share issued after the Record Time and prior to the earlier of the Separation Time and the Expiration Time.

Exercise of Rights

The Rights are not exercisable initially. The Rights will separate from the Common Shares and become exercisable at the close of business on the tenth business day after the earliest of (i) the first public announcement of facts indicating that any person has acquired Beneficial Ownership (as defined in the Rights Plan) of 20% or more of the Common Shares; (ii) the date of commencement of, or first public announcement of the intent of any person to make, a take-over bid that would result in such person Beneficially Owning 20% or more of the Common Shares (other than a Permitted Bid or a Competing Permitted Bid (each as defined in the Rights Plan)); and (iii) the date upon which a Permitted Bid or Competing Permitted Bid ceases to be such, or such later date as the Board may determine (in any such case, the "Separation Time").

After the Separation Time, but prior to the occurrence of a Flip-in Event (as defined below), each Right may be exercised to purchase one Common Share at an exercise price per Right (the "Exercise Price") equal to five times the market price of the Common Shares as at the Separation Time.

The exercise price payable and the number of securities issuable upon the exercise of the Rights are subject to adjustment from time to time upon the occurrence of certain corporate events affecting the Common Shares.

Flip-in Event

Subject to certain exceptions (as discussed below), upon the acquisition by any person (an "Acquiring Person") of Beneficial Ownership of 20% or more of the Common Shares (a "Flip-in Event") and following the Separation Time, each Right, other than Rights Beneficially Owned by an Acquiring Person, its affiliates and associates, their respective joint actors and certain transferees, may be exercised to purchase that number of Common Shares which have an aggregate market value equal to two times the Exercise Price of the Rights for an amount in cash equal to the Exercise Price. Rights beneficially owned by an Acquiring Person, its affiliates and associates, their respective joint actors and certain transferees will be void.

Certificates and Transferability

Prior to the Separation Time, certificates for Common Shares will also evidence one Right for each Common Share represented by the certificate. Certificates issued after the Record Time, but prior to the earlier of the Separation Time and the Expiration Time, will bear a legend to this effect. Prior to the Separation Time, Rights will not be transferable separately from the associated Common Shares. From and after the Separation Time, the Rights will be evidenced by Rights certificates which will be transferable and trade separately from the Common Shares.

Permitted Bids

The Rights Plan will not be triggered by a Permitted Bid or Competing Permitted Bid. A Permitted Bid is one that: (i) is made by means of a take-over bid circular; (ii) is made to all holders of Common Shares; (iii) is open for at least 60 days or such longer period as may be prescribed as the minimum deposit period under applicable Canadian law; (iv) contains an irrevocable condition that no Common Shares will be taken up and paid for until more than 50% of the Common Shares held by the independent shareholders of the Company have been tendered and not withdrawn; (v) contains an irrevocable condition that Common Shares may be deposited at any time and withdrawn until they are taken up and paid for; and (vi) contains an irrevocable provision that, if 50% of the Common Shares held by the independent shareholders of the Company are tendered, the bidder will make an announcement to that effect and keep the bid open for at least 10 more business days.

Acquiring Person

In general, an Acquiring Person is a person who Beneficially Owns 20% or more of the outstanding Common Shares. Excluded from the definition of "Acquiring Person" are (i) the Company and its subsidiaries; (ii) an underwriter or member of a banking or selling group that acquires Common Shares in connection with a distribution by the Company of securities pursuant to a prospectus or by way of a private placement; and (iii) any person who becomes the Beneficial Owner of 20% or more of the outstanding Common Shares as a result of one or more or any combination of a Permitted Bid Acquisition, an Exempt Acquisition, a Pro-Rata Acquisition, a Convertible Security Acquisition or an acquisition, redemption or cancellation by the Company of Common Shares. The definitions of a "Permitted Bid Acquisition", "Exempt Acquisition", "Pro-Rata Acquisition" and "Convertible Security Acquisition" are set out in the Rights Plan. However, in general:

Additionally, the Rights Plan provides that a person (a "Grandfathered Person") who is the Beneficial Owner of 20% or more of the outstanding Common Shares as at November 10, 2015 shall not be an Acquiring Person. This exception shall not, and shall cease to, apply if after the November 10, 2015 the Grandfathered Person: (i) ceases to own 20% or more of the outstanding Common Shares; or (ii) becomes the Beneficial Owner of more than 1% of the number of outstanding Common Shares then outstanding in addition to those Common Shares such Person already holds (other than pursuant to one or more or any combination of a Permitted Bid Acquisition, an Exempt Acquisition, a Pro-Rata Acquisition, a Convertible Security Acquisition or an acquisition, redemption or cancellation by the Company of Common Shares). The Company is not aware of any person who owns 20% or more of the Common Shares.

Redemption and Waiver

At any time prior to the occurrence of a Flip-in Event, the Board may redeem the Rights at a redemption price of $0.00001 per Right with the prior approval of the holders of Common Shares or Rights. The Board will be deemed to have elected to redeem the Rights if a person, who has made a Permitted Bid, a Competing Permitted Bid or a take-over bid in respect of which the Separation Time has occurred and in respect of which the Board has waived the application of the Rights Plan, takes up and pays for Common Shares pursuant to the terms and conditions of such Permitted Bid, Competing Permitted Bid or take-over bid.

At any time prior to the occurrence of a Flip-in Event and with the prior approval of the holders of Common Shares or Rights, the Board may waive the flip-in provisions where a Flip-in Event would occur by reason of an acquisition of Common Shares otherwise than pursuant to a take-over bid made by means of a take-over bid circular to all holders of record of Common shares.

If the provisions of the Rights Plan that apply upon the occurrence of a Flip-in Event are waived in respect of a take-over bid made by means of a take-over bid circular to all holders of record of Common Shares, then the provisions of the Rights Plan that apply upon the occurrence of a Flip-in Event will also be deemed to be waived in respect of any other Flip-in Event occurring by reason of any take-over bid made by any other offeror by means of a take-over bid circular to all holders of record of Common Shares prior to the expiry of any take-over bid in respect of which a waiver is, or is deemed to have been, granted.

In addition, the operation of the Rights Plan may be waived where a person has inadvertently become an Acquiring Person and has reduced its Beneficial Ownership of Common Shares such that it is no longer an Acquiring Person.

Amendment of the Rights Plan

The Board may amend the Rights Plan in the period (up to six months) before the Rights Plan is initially approved by the shareholders of the Company (whether or not such action would materially adversely affect the interests of the holders of Rights generally). Thereafter, amendments, other than those required to correct clerical or typographical errors or to maintain the validity of the Rights Plan as a result of a change of law, require shareholder approval.

This summary description of the Rights does not purport to be complete and is qualified in its entirety by reference to the Rights Agreement filed with this report as Exhibit 4.1 and incorporated herein by reference.

The disclosures set forth in Item 1.01 and Item 5.03 of this report are incorporated herein by reference.

Also on November 10, 2015, the Board of Directors of the Company adopted a new by-law to require advance notice of director nominations by shareholders (the “Advance Notice By-Law”). The Advance Notice Bylaw fixes certain deadlines by which shareholders must submit a notice of director nominations to the Company prior to a shareholders’ meeting and sets forth the information which must be included in the notice.

The Advance Notice By-law is designed to ensure that shareholders receive adequate notice of all director nominations to be considered at a shareholders' meeting and sufficient information so that shareholders can cast an informed vote.

The Advance Notice By-law provides that for an annual meeting of shareholders (including an annual and special meeting), advance notice of director nominations to the Company must be given not less than 30 days prior to the date of the annual meeting. If the annual meeting is to be held on a date that is less than 50 days following the date of public announcement of the meeting, notice must be given not later than the close of business on the 10th day following the notice date. In the case of a special meeting of shareholders (which is not also an annual meeting), notice to the Company must be given not later than the close of business on the 15th day following the day on which the first public announcement of the date of the special meeting was made.

The Advance Notice By-law is effective immediately. Shareholders of SunOpta will be asked to ratify and confirm the Advance Notice By-Law at the 2016 annual shareholders' meeting.

The foregoing summary does not purport to be complete and is qualified in its entirety by reference to ByLaw Number 15 of the Company, a copy of which is filed with this report as Exhibit 3.1 and incorporated herein by reference.

The list of exhibits in the Exhibit Index is incorporated herein by reference.

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

EXHIBIT INDEX