POT Potash Corp. of Saskatchewan Inc. (delisted)

NOTES TO FINANCIAL STATEMENTS

AS OF DECEMBER 31, 2015 AND 2014, AND FOR THE YEAR ENDED DECEMBER 31, 2015

The following description of the PCS U.S. Employees’ Savings Plan for Collectively Bargained Employees (the “Plan”) is provided for general information purposes only. Participants should refer to the Plan document for more complete information.

General  — The Plan is a defined contribution plan sponsored by PCS Administration (USA), Inc. (the “Company”), covering all eligible employees of PCS Purified Phosphates, PCS Nitrogen Ohio, L.P. (“Lima”), and White Springs Agricultural Chemicals, Inc., who are represented by a collective bargaining agreement, as defined in the Plan. The Employee Benefits Committee of the Company controls and manages the operation and administration of the Plan. Fidelity Management Trust Company (“Fidelity”) serves as the trustee of the Plan, and Fidelity Investments Institutional Operations Company, Inc., an affiliate of the Trustee, is record keeper. The Plan is subject to the provisions of the Employee Retirement Income Security Act of 1974 (“ERISA”).

Contributions  — Participants may contribute up to 50% of base compensation each year, as defined in the Plan, subject to certain Internal Revenue Code of 1986, as amended (“IRC”), limitations. These contributions may be pretax contributions and/or after-tax contributions. Participants who are age 50 and over may also make “catch-up” contributions. The Plan has an automatic enrollment provision under which new participants are provided with a 3% pretax deferral, unless they formally waive participation or elect a different participation level. The automatic enrollment provision does not apply to Lima employees who are covered under this Plan.

The Company matches 100% of the first 3% of base compensation that participants contribute. Catch-up contributions are not eligible for the Company match. Participants may also rollover amounts representing distributions from other qualified defined benefit or contribution plans (rollover contributions), which are not eligible for the Company match. The Company also contributes a basic contribution of 6% of base compensation on behalf of each eligible employee of Lima, as defined in the Plan.

The Company may also make a discretionary Company performance contribution ranging from 0% to 3% of each eligible participant’s base pay. The 2015 Company performance contribution was 2% of each eligible participant’s base pay.

Participant Accounts  — Individual accounts are maintained for each Plan participant. Each participant’s account is credited with the participant’s contribution, the Company’s matching contribution, the Company’s performance contribution when applicable, and allocations of Plan earnings. These accounts are also charged with withdrawals, an allocation of Plan losses and administrative expense. Allocations are based on participant earnings or account balances, as defined in the Plan. The benefit to which a participant is entitled is the benefit that can be provided from the participant’s vested account.

Investments  — Participants direct the investment of their account balances and contributions into various investment options offered by the Plan. The Plan currently offers PCS common stock, a

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selection of mutual funds, and one pooled investment stable value fund. The PCS stock purchase account is a money market fund that is used in the recordkeeping of the purchases and sales of fractional shares of PCS common stock and is not available as a participant-directed investment option.

Participants who are enrolled in the Plan under the automatic enrollment provisions and who have not otherwise made an investment election will have their contributions and the employer contributions invested in the Plan’s “default fund,” which has been designated as the Fidelity Freedom Funds, specifically the Fidelity Freedom Fund that has a target retirement date closest to the year that the participant might retire, based on the participant’s current age and assuming a normal retirement age of 65.

In November 2015, participants were notified of investment option changes, changes to plan administrative fees and expenses, and the addition of revenue credits, all effective in January 2016. Investment balances and future contributions were moved from the old investment options to the new and existing investment options on January 4, 2016. In addition to the previously charged asset-based fees and individual fees and expenses, beginning January 1, 2016, participants will be charged plan administrative fees via quarterly deductions from their accounts. Additionally, beginning in the first quarter of 2016, certain investment funds will generate quarterly revenue credits which will be allocated to the accounts of participants who invest in these funds.

Vesting  — Participants are immediately vested in their own contributions and in the Company performance contribution, plus actual earnings thereon. Vesting in the Company’s matching contribution is based on years of continuous service. Participants vest 20% per year of credited service and are 100% vested after five years of credited service. Lima participants are fully vested in the Company’s basic contribution after a three-year period of service, although no partial vesting shall apply (i.e., three-year cliff vesting). Forfeited balances of terminated participants are used to reduce future Company contributions.

Forfeited Accounts  — At December 31, 2015 and 2014, there were no forfeited nonvested accounts. Accounts forfeited during the year ended December 31, 2015, totaling $2,315, were used to reduce employer contributions to the Plan.

Participant Loans  — Participants may borrow from their fund accounts up to a maximum amount equal to the lesser of $50,000 or 50% of their vested account balance. Loan terms range from one to five years or up to 20 years for the purchase of a primary residence. The loans are secured by the balance in the participant’s account. All new loans bear interest at the prime rate plus 200 basis points. Previously, interest rates on outstanding general loans were set at two percentage points above the rate for five-year U.S. Treasury notes on the last day of the preceding calendar quarter in which the funds were borrowed and the interest rate on primary residence loans was set at the standard lending rate for 20-year fixed rate home mortgage loans. Principal and interest are paid ratably through payroll deductions. As of December 31, 2015, participant loans have maturities through 2035 at interest rates ranging from 3.0% to 7.0%.

Payment of Benefits  — On termination of service, a participant may elect to receive either a lump-sum amount equal to the value of the participant’s vested interest in his or her account or in installment payments to the extent permitted by other Plan provisions. A participant may elect to receive payment of benefits prior to termination of service, as defined in the Plan. Participants may elect to receive their investment in the PCS stock fund in cash or in whole shares of PCS common stock. The Plan includes an employee stock ownership plan feature with a dividend payout program whereby participants may elect to receive dividends paid on their vested shares of PCS common stock in the PCS stock fund in PCS common stock or cash.

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Basis of Accounting  — The accompanying financial statements have been prepared in accordance with accounting principles generally accepted in the United States of America (“GAAP”).

Use of Estimates  — The preparation of financial statements in conformity with GAAP requires Plan management to make estimates and assumptions that affect the reported amounts of net assets available for benefits and changes therein and disclosure of contingent assets and liabilities. Actual results could differ from those estimates.

Risks and Uncertainties  — The Plan utilizes various investment instruments, including mutual funds, a pooled investment stable value fund, and common stock. Investment securities, in general, are exposed to various risks, such as interest rate, credit, and overall market volatility. Due to the level of risk associated with certain investment securities, it is reasonably possible that changes in the values of investment securities will occur in the near term and that such changes could materially affect the amounts reported in the financial statements. As of December 31, 2015, there was a significant concentration of participant-directed investments in the common stock of the Company’s parent (14%).

Adoption of New Accounting Pronouncements – In May 2015, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) No. 2015-07, “Disclosures for Investments in Certain Entities That Calculate Net Asset Value per Share (or Its Equivalent)” (“ASU 2015-07”), which removes the requirement to present certain investments for which the practical expedient is used to measure fair value at net asset value within the fair value hierarchy table. Instead, an entity would be required to include those investments as a reconciling item so that the total fair value amount of investments in the disclosure is consistent with the fair value investment balance on the statement of net assets available for benefits. The Plan elected to early adopt ASU 2015-07 as of December 31, 2015, as permitted and has applied ASU 2015-07 retrospectively, as required. The Plan presents the investment disclosure required by ASU 2015-07 in the fair value hierarchy tables for 2015 and 2014 in Note 3, “Fair Value Measurements.” There were no other impacts on the statements of net assets available for benefits as of December 31, 2015 and December 31, 2014 and the statement of changes in net assets available for benefits for the year ended December 31, 2015.

In July 2015, the FASB issued ASU No. 2015-12, “Plan Accounting: Defined Benefit Pension Plans (Topic 960), Defined Contribution Pension Plans (Topic 962), Health and Welfare Benefit Plans (Topic 965); (Part I) Fully Benefit-Responsive Investment Contracts, (Part II) Plan Investment Disclosures, (Part III) Measurement Date Practical Expedient,” (“ASU 2015-12”), which simplifies the required disclosures related to employee benefit plans. Part I eliminates the requirement to measure and disclose the fair value of fully benefit-responsive contracts; contract value is the only required measure for fully benefit-responsive investment contracts. Part II eliminates the requirement to disclose individual investments which comprise 5% or more of total net assets available for benefits, as well as the net appreciation or depreciation of fair values by type. Part II also requires plans to continue to disaggregate investments that are measured using fair value by general type, however plans are no longer required to also disaggregate investments by nature, characteristics and risks. Furthermore, the disclosure of information about fair value measurements shall be provided by general type of plan asset. Part III is not applicable to the Plan. ASU 2015-12 is effective for fiscal years beginning after December 15, 2015 with early adoption permitted. The Plan elected to early-adopt ASU 2015-12, and has applied the provisions retrospectively. The adoption of ASU 2015-12 has resulted in the reclassification of $460,165 related to the adjustment from fair value to contract value for a fully benefit-responsive common collective trust fund within its Statement of Net Assets Available for Benefits as of December 31, 2014. Certain disclosures that are no longer required were removed, including historical disclosure of individual investments which comprise 5% or more of total net assets available for benefits and the net

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appreciation or depreciation of fair value by type. There were no other impacts on the statements of net assets available for benefits as of December 31, 2015 and December 31, 2014 and the statement of changes in net assets available for benefits for the year ended December 31, 2015.

Investment Valuation and Income Recognition  — The Plan’s investments are stated at fair value. Fair value of a financial instrument is the price that would be received to sell an asset in an orderly transaction between market participants at the measurement date. See Note 3 for a description of valuation methods.

Purchases and sales of securities are recorded on a trade-date basis. Interest income is recorded on the accrual basis. Dividends are recorded on the ex-dividend date. Net appreciation in fair value of investments includes the Plan’s gains and losses on investments bought and sold as well as held during the year.

Management fees and operating expenses charged to the Plan for investments in the mutual funds and pooled investment stable value fund are deducted from income earned on a daily basis and are not separately charged to an expense. Consequently, management fees and operating expenses are reflected as a reduction of investment return for such investments.

Notes Receivable from Participants  — Notes receivable from participants are measured at their unpaid principal balance plus any accrued but unpaid interest. Delinquent participant loans are recorded as distributions based on the terms of the Plan document.

Administrative Revenue (Expense)  — Administrative expenses of the Plan are paid by the Plan or the Plan sponsor, as provided in the Plan document. Investment management fees for certain investments are included as a reduction of investment return and not reflected separately in the statements of changes in net assets available for benefits. Administrative revenues arise when investment managers return a portion of the investment fees to the Trustee to offset the administrative expenses. Any excess resulting from this revenue sharing remains in an unallocated account from which future Plan expenses can be paid. The Plan held undistributed administrative revenues of $1,039 and $2,934, at December 31, 2015 and 2014, respectively.

Payment of Benefits  — Benefit payments to participants are recorded upon distribution. There were no amounts allocated to accounts of participants who had elected to withdraw from the Plan, but had not yet been paid at December 31, 2015 and 2014.

Fair value measurements establish a fair value hierarchy that prioritizes the inputs to valuation techniques used to measure fair value. The hierarchy gives the highest priority to unadjusted quoted prices in active markets for identical assets or liabilities (Level 1 measurements) and the lowest priority to unobservable inputs (Level 3 measurements). The three levels of inputs within the fair value hierarchy are described below:

Level 1  — Unadjusted quoted prices in active markets that are accessible at the measurement date for identical, unrestricted assets or liabilities.

Level 2  — Quoted prices in markets that are not considered to be active or financial instruments for which all significant inputs are observable, either directly or indirectly. Level 2 inputs may also include pricing models whose inputs are observable or derived principally from or corroborated by observable market data.

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Level 3  — Prices or valuations that require inputs that are both significant to the fair value measurement and unobservable.

A financial instrument’s level within the fair value hierarchy is based on the lowest level of any input that is significant to the fair value measurement.

The following descriptions of the valuation methods and assumptions used by the Plan to estimate the fair values of the investments apply to the investments held.

Common Stock  — The PCS Common stock is valued using quoted closing prices listed on a nationally recognized security exchange (Level 1 inputs).

Mutual Funds and Short Term Funds  — Shares of registered investment companies and money market funds are valued at quoted market prices that represent the net asset value of shares held at the Plan year-end (Level 1 inputs).

Stable Value Fund  — The Fidelity Managed Income Portfolio II (the “Portfolio”), the pooled investment stable value fund, is stated at fair value which is contract value, as the Portfolio’s investment contracts are fully benefit-responsive. Contract value of the Portfolio is the value at which participants ordinarily transact and is the sum of participant and Company contributions, plus accrued interest thereon less withdrawals.

As a practical expedient, the fair value of participation units in the stable value fund is based upon the net asset value (NAV) of such fund as reported in the audited financial statements of the stable value fund. NAV is determined to be contract value, the value at which participants ordinarily transact. Redemption is permitted daily with no restrictions or notice periods and there are no unfunded commitments.

In accordance with GAAP, investments measured at net asset value as a practical expedient have not been classified in the fair value hierarchy. The fair value amounts presented in the following tables are intended to permit reconciliation to the amounts presented in the Statements of Net Assets Available for Benefits.

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The Plan’s investment assets at fair value, set forth by level within the fair value hierarchy, as of December 31, 2015 and 2014, were as follows:

For the years ended December 31, 2015 and 2014, there were no transfers in or out of Levels 1, 2, or 3. The Plan’s policy is to recognize transfers between levels at the end of the reporting period.

The Fidelity Managed Income Portfolio II  — The Portfolio is a stable value fund that is a commingled pool of the Fidelity Group Trust for Employee Benefit Plans. The Portfolio is invested in fixed interest insurance company investment contracts, money market funds, corporate and government bonds, mortgage-backed securities, bond funds, and other fixed income securities, with the objective of providing a high level of return that is consistent with also providing stability of investment return, preservation of capital and liquidity to pay plan benefits of its retirement plan investors.

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Certain events limit the ability of the Plan to transact at contract value with the Portfolio issuer. Such events include the following: (a) the Plan’s failure to qualify under the Internal Revenue Code; (b) the establishment of a defined contribution plan that competes with the Plan for employee contributions; (c) any substantive modification of the Portfolio or the administration of the Portfolio that is not consented to by the wrap issuer; (d) any change in law, regulation or administrative ruling applicable to the Plan that could have a material adverse effect on the Portfolio’s cash flow; (e) any communication given to unitholders that is designed to induce or influence unitholders not to invest in the Portfolio or to transfer assets out of the Portfolio; (f) any transfer of assets from the Portfolio directly to a competing investment option; or (g) the inability of the Portfolio to maintain wrap contracts covering its underlying assets. The Plan administrator does not believe the occurrence of any such value event, which would limit the Plan’s ability to transact at contract value with participants, is probable.

Participants may ordinarily direct the withdrawal or transfer of all or a portion of their investment in the Portfolio at contract value. The crediting interest rates were 1.52% and 1.38% at December 31, 2015 and 2014, respectively, which were based on the interest rates of the underlying portfolio of assets. The average yield for the year ended December 31, 2015, was 1.97%. The participants in the Plan are able to redeem from the Portfolio immediately. The Portfolio has no redemption restrictions and there is no redemption notice period required for participants.

Certain Plan investments are shares of investment funds managed by Fidelity Investments Institutional Operations Company, Inc., an affiliate of the Plan Trustee, investment manager and record keeper. These transactions qualify as exempt party-in-interest transactions. Fees paid by the Plan for the investment management services were included as a reduction of the return earned on each fund. At December 31, 2015 and 2014, the Plan held approximately 301,372 and 270,003 shares, respectively, of PCS common stock, with a cost basis of $10,284,818 and $9,971,958, respectively. During the year ended December 31, 2015, the Plan recorded dividend income of $414,260.

Although it has not expressed any intention to do so, the Company has the right under the Plan to discontinue its contributions at any time and to terminate the Plan subject to the provisions set forth in ERISA. In the event that the Plan is terminated, participants would become 100% vested in their accounts.

The Internal Revenue Service (“IRS”) has determined and informed the Company by a letter dated September 18, 2013, that the Plan was designed in accordance with applicable IRC requirements. Although the Plan has been amended since receiving the determination letter, the Plan administrator believes that the Plan is designed and is currently being operated in compliance with the applicable requirements of the IRC. Therefore, no provision for income taxes has been included in the Plan’s financial statements. GAAP requires Plan management to evaluate tax positions taken by the Plan and recognize a tax liability (or asset) if the Plan has taken an uncertain position that more likely than not would not be sustained upon examination by the IRS. The Plan administrator has analyzed the tax positions taken by the Plan and has concluded that as of December 31, 2015, there are no uncertain tax positions taken or expected to be taken that would require recognition of a liability (or asset) or disclosure in the Plan’s financial statements. The Plan is subject to routine audits by taxing jurisdictions; however, there are currently no audits for any tax periods in progress. The Plan administrator believes it is no longer subject to income tax examinations for years prior to 2012.

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SUPPLEMENTAL SCHEDULE

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PCS U.S. EMPLOYEES’ SAVINGS PLAN

FOR COLLECTIVELY BARGAINED EMPLOYEES

Employer ID No: 562111626

Plan No: 007