UNITED STATES SECURITIES AND EXCHANGE COMMISSIONWASHINGTON, D.C. 20549FORM 11-KFOR ANNUAL REPORTS OF EMPLOYEE STOCK PURCHASE, SAVINGS AND SIMILAR PLANS PURSUANT TO SECTION 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934XANNUAL REPORT PURSUANT TO SECTION 15(d) OF THE SECURITIESEXCHANGE ACT OF 1934For the fiscal year ended December 31, 2017OR__   TRANSITION REPORT PURSUANT TO SECTION 15(d) OF THESECURITIES EXCHANGE ACT OF 1934For the transition period from _______ to _______COMMISSION FILE NUMBER 1-3619A.   Full title of the plan and the address of the plan, if different from that of the issuer named below:PFIZER SAVINGS PLANB.   Name of issuer of the securities held pursuant to the plan and the address of its principal executive office:PFIZER INC. 235 EAST 42ND STREET NEW YORK, NEW YORK 10017








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PFIZER SAVINGS PLAN





Table of Contents





PageReport of Independent Registered Public Accounting Firm1Financial StatementsStatements of Net Assets Available for Plan Benefits as of December 31, 2017 and 20162Statement of Changes in Net Assets Available for Plan Benefits for the year ended December 31, 20173Notes to Financial StatementsBeginning on page4Supplemental Schedules*Schedule H, Line 4i - Schedule of Assets (Held at End of Year)Beginning on page13Schedule H, Line 4j - Schedule of Reportable Transactions15Exhibit Index16Signature17


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|*Note: | Other schedules required by 29 CFR 2520.103-10 of the Department of Labor’s Rules and Regulations for Reporting and Disclosure under the Employee Retirement Income Security Act of 1974, as amended, have been omitted because they are not applicable.







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Report of Independent Registered Public Accounting Firm








To the Savings Plan Committee Pfizer Savings Plan:





Opinion on the Financial Statements





We have audited the accompanying statements of net assets available for plan benefits of the Pfizer Savings Plan (the Plan) as of December 31, 2017 and 2016, the related statement of changes in net assets available for plan benefits for the year ended December 31, 2017, and the related notes (collectively, the financial statements). In our opinion, the financial statements present fairly, in all material respects, the net assets available for plan benefits of the Plan as of December 31, 2017 and 2016, and the changes in net assets available for plan benefits for the year ended December 31, 2017, in conformity with U.S. generally accepted accounting principles.





Basis for Opinion





These financial statements are the responsibility of the Plan’s management. Our responsibility is to express an opinion on these financial statements based on our audits. We are a public accounting firm registered with the Public Company Accounting Oversight Board (United States) (PCAOB) and are required to be independent with respect to the Plan in accordance with the U.S. federal securities laws and the applicable rules and regulations of the Securities and Exchange Commission and the PCAOB.


We conducted our audits in accordance with the standards of the PCAOB. Those standards require that we plan and perform the audit to obtain reasonable assurance about whether the financial statements are free of material misstatement, whether due to error or fraud. Our audits included performing procedures to assess the risks of material misstatement of the financial statements, whether due to error or fraud, and performing procedures that respond to those risks. Such procedures included examining, on a test basis, evidence regarding the amounts and disclosures in the financial statements. Our audits also included evaluating the accounting principles used and significant estimates made by management, as well as evaluating the overall presentation of the financial statements. We believe that our audits provide a reasonable basis for our opinion.





Accompanying Supplemental Information





The supplemental information in the accompanying Schedule H, Line 4i – Schedule of Assets (Held at End of Year) as of December 31, 2017 and Schedule H, Line 4j – Schedule of Reportable Transactions for the Year Ended December 31, 2017 has been subjected to audit procedures performed in conjunction with the audit of the Plan’s financial statements. The supplemental information is presented for the purpose of additional analysis and is not a required part of the financial statements but includes supplemental information required by the Department of Labor’s Rules and Regulations for Reporting and Disclosure under the Employee Retirement Income Security Act of 1974. The supplemental information is the responsibility of the Plan’s management. Our audit procedures included determining whether the supplemental information reconciles to the financial statements or the underlying accounting and other records, as applicable, and performing procedures to test the completeness and accuracy of the information presented in the supplemental information. In forming our opinion on the supplemental information, we evaluated whether the supplemental information, including its form and content, is presented in conformity with the Department of Labor’s Rules and Regulations for Reporting and Disclosure under the Employee Retirement Income Security Act of 1974. In our opinion, the supplemental information in the accompanying Schedule H, Line 4i – Schedule of Assets (Held at End of Year) as of December 31, 2017 and Schedule H, Line 4j – Schedule of Reportable Transactions for the Year Ended December 31, 2017 is fairly stated, in all material respects, in relation to the financial statements as a whole.





/s/ KPMG LLP





We have not been able to determine the specific year that KPMG and our predecessor firms began serving as the Plan’s auditor, however, we are aware that KPMG and our predecessor firms have served as the Plan’s auditor since at least 1977.





Memphis, Tennessee June 28, 2018





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PFIZER SAVINGS PLAN STATEMENTS OF NET ASSETS AVAILABLE FOR PLAN BENEFITS





As of December 31,(THOUSANDS OF DOLLARS)20172016AssetsInvestments, at fair valuePfizer Inc. common stock$1,841,995$1,786,627Pfizer Inc. preferred stock46,32247,662Common/collective trust funds8,093,2696,616,672Mutual funds1,531,3511,383,443Self-directed brokerage account203,851174,756Total investments, at fair value11,716,78810,009,160Investments, at contract valueT. Rowe Price Stable Value Fund1,408,8361,419,470Total investments13,125,62411,428,630ReceivablesParticipant contributions9,0708,520Company contributions91,88576,081Notes receivable from participants79,88278,420Securities sold—779Interest and other4,8594,775Total receivables185,696168,575Total assets13,311,32011,597,205LiabilitiesPayable for securities purchased2,6522,885Investment management fees payable391414Total liabilities3,0443,299Net assets available for plan benefits$13,308,276$11,593,906


Amounts may not add due to rounding.


See accompanying Notes to Financial Statements.





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PFIZER SAVINGS PLAN STATEMENT OF CHANGES IN NET ASSETS AVAILABLE FOR PLAN BENEFITS





(THOUSANDS OF DOLLARS)Year Ended December 31, 2017Additions/(reductions) to net assets attributed to:Investment incomeNet appreciation in investments$1,813,102Pfizer Inc. common stock dividends67,748Pfizer Inc. preferred stock dividends1,366Interest income52,200Dividend income from other investments12,651Total investment income1,947,066Interest income from notes receivable from participants3,430Less: Investment management, redemption and loan fees(3,233)Net investment and interest income1,947,263ContributionsParticipant379,382Company212,660Rollovers into the Plan83,252Total contributions675,294Total additions2,622,557Deductions from net assets attributed to:Benefits paid to participants914,604Net increase1,707,953Transfers into the Plan6,417Net assets available for plan benefitsBeginning of year11,593,906End of year$13,308,276


Amounts may not add due to rounding.


See accompanying Notes to Financial Statements.





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PFIZER SAVINGS PLAN NOTES TO FINANCIAL STATEMENTS











1. Description of the Plan





The following description of the Pfizer Savings Plan (the Plan) provides only general information. Participants should refer to the Plan document for a more complete description of the Plan’s provisions.





General





The Plan is a defined contribution plan. Participation in the Plan is open to any employee of Pfizer Inc. (the Company or Plan Sponsor) or an affiliate which has, with the consent of the Plan Sponsor, adopted the Plan and who is included within a group or class designated by the Plan Sponsor as set forth in the Plan document. The Plan excludes any employees covered by another Company-sponsored defined contribution plan. The Plan is subject to the provisions of the Employee Retirement Income Security Act of 1974, as amended (ERISA), and the Internal Revenue Code of 1986, as amended (the Code).





On June 24, 2016, the Company acquired Anacor Pharmaceuticals, Inc. (Anacor). In connection with the acquisition, the Company adopted and assumed sponsorship of the Anacor Pharmaceuticals, Inc. 401(k) Plan (Anacor Plan), effective June 24, 2016. On September 1, 2017, Anacor colleagues became eligible for the Plan, and the Anacor Plan was merged into the Plan on October 2, 2017.





Plan Administration





The Plan is administered by the Savings Plan Committee of the Plan Sponsor (the Plan Administrator), a named fiduciary of the Plan. The Plan Administrator monitors and reports on (i) the selection and termination of the trustee, custodian, investment managers and other service providers to the Plan and (ii) the investment activity and performance of the Plan, with the exclusion of the Company stock funds, which are reviewed by an independent fiduciary appointed by the Savings Plan Committee.





Administrative Costs





In general, through December 31, 2016, costs and expenses of administering the Plan were paid and absorbed by the Plan or the Plan Sponsor. The Plan’s administrative expenses were paid for through offsets and/or payments associated with one or more of the Plan’s investment options. Investment management or related fees associated with certain investment fund options, fees associated with loans and in-service withdrawals (for active participants) and check fees were paid by participants.


Beginning in 2017, the Plan Sponsor changed the way certain Plan costs, which include general Plan administrative fees and expenses, such as recordkeeping, trustee and investment reporting fees, are paid in the Plan. The general Plan administrative fees and expenses are deducted directly from each participant’s account and are no longer included as part of the investment option fee structure. The quarterly fee deductions take place on the first business day following the end of each quarter (and are deducted from any full account distribution occurring during a quarter).





Contributions





Participants may contribute up to 30% of their eligible compensation on a before-tax basis, an after-tax basis or a combination of both. For all participants, contributions of up to 3% of eligible compensation are matched 100% by the Company and the next 3% are matched 50% by the Company. Participant contributions in excess of 6% are not matched.





Company matching contributions are deposited into the Plan each quarter, rather than on each pay date. In addition, generally participants must be actively employed on the last day of the quarter to receive the match; however, if the participant separates from the Company prior to the last day of the quarter due to retirement (defined as at least age 55 with at least 10 years of service or age 65), death or disability, such participant will receive the matching contribution. In January 2017, the Company funded the fourth quarter 2016 Company matching contributions in the amount of approximately $24.5 million. In January 2018, the Company funded the fourth quarter 2017 Company matching contributions in the amount of approximately $26.5 million. These contributions are reported in the Company contributions receivable in the accompanying statements of net assets available for plan benefits.








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PFIZER SAVINGS PLAN NOTES TO FINANCIAL STATEMENTS





Effective January 1, 2015, Company matching contributions are invested according to each participant’s investment election for his or her contributions. Prior to January 1, 2015, Company matching contributions were directed to the Pfizer Stock Match Fund, in which participants could diversify 100% of their investments into any of the other available investment funds at any time. This change did not affect any existing holdings in the Pfizer Stock Match Fund, only future investment direction. Pfizer Inc. common stock continues to be offered as an investment option in the Pfizer Stock Fund, but the Company no longer directs its matching contributions to the Pfizer Stock Match Fund.





Under the Code, salary deferral contributions, total annual contributions and the amount of compensation that may be included for Plan purposes are subject to annual limitations; any excess contributions are refunded to participants in the following year, if applicable.





The Plan includes a Roth 401(k) contribution option, which allows participants to contribute after-tax dollars into a Roth 401(k) account within the Plan and allows for tax-free earnings on those contributions. If subsequent distributions are considered “qualified Roth distributions” under the Code, such distributions are not subject to taxes. If a participant has contributions in the Plan that are immediately distributable as money that would be eligible to be rolled over to an individual retirement account, the participant may elect to convert those assets to after-tax Roth 401(k) contributions through the Roth 401(k) In-Plan Conversion feature. A participant’s age and date of the first Roth 401(k) contribution will determine which contributions are eligible to satisfy these requirements.





The Plan includes a retirement savings contribution (RSC) for employees hired, rehired or transferred from certain positions on or after January 1, 2011, who are not eligible for the Pfizer Consolidated Pension Plan, a Company-sponsored defined benefit plan. Effective January 1, 2018, the Company froze its non-union U.S. and Puerto Rico defined benefit plans and began providing RSC eligibility for those active colleagues impacted. The RSC provides an additional annual employer-provided contribution based on age and years of service. In February 2017, the Company funded the RSC for Plan year 2016 in the amount of approximately $51.6 million. In February 2018, the Company funded the RSC for Plan year 2017 in the amount of approximately $65.4 million. These contributions are reported in the Company contributions receivable in the accompanying statements of net assets available for plan benefits.





Participant Accounts





Each participant’s account is credited with the participant’s contributions, the Company’s contributions and an allocation of Plan earnings/(losses). Allocations are based on participants’ account balances, as defined in the Plan.





Vesting





Participants are immediately 100% vested in their contributions and all Company contributions with the exception of the RSC. For the RSC, participants are 100% vested after three years of credited service.





Forfeited Amounts





Forfeited nonvested accounts of terminated participants are generally used to reduce future Company contributions. At December 31, 2017 and 2016, forfeited nonvested accounts totaled approximately $0.6 million and $0.4 million, respectively. In 2017, Company contributions were reduced by approximately $2.4 million from forfeited nonvested accounts.





Rollovers into the Plan





Participants may elect to roll over one or more account balances from Company-sponsored or other qualified plans into the Plan.





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PFIZER SAVINGS PLAN NOTES TO FINANCIAL STATEMENTS





Investment Options


Nonparticipant-Directed FundsPfizer Stock Match FundThis fund holds investments in the common stock of Pfizer Inc. Prior to January 1, 2015, Company matching contributions were directed to this fund. See Note 1,Description of the Plan: Contributions, for additional information.All participants can diversify 100% of their investments in the Pfizer Stock Match Fund into any of the other available investment funds at any time.The fund targets a cash position of 0.25% of the fund balance for purposes of liquidity. The cash position may vary day to day.Pfizer Frozen Stock FundThis fund holds investments in the common stock of Pfizer Inc. The Pfizer Frozen Stock Fund is a combination of Company stock funds consolidated in December 2014 that contain participant-directed and nonparticipant-directed funds and is frozen to new contributions.All participants can diversify 100% of their investments in the Pfizer Frozen Stock Fund into any of the other available investment funds at any time.The fund targets a cash position of 0.25% of the fund balance for purposes of liquidity. The cash position may vary day to day.Pfizer Preferred Stock FundThis fund holds investments in the preferred stock of Pfizer Inc., which were allocated to participants in the Pharmacia Savings Plan before the merger of that plan into the Plan on January 1, 2008. Dividends paid to a participant’s Pfizer Preferred Stock Fund account are substituted for an allocation of Pfizer Inc. common stock.





Participant-Directed Funds – Each participant in the Plan elects to have his or her contributions invested in any one or a combination of investment funds in the Plan. Transfers between funds must be made in whole percentages or dollar amounts. Based on the investment option, certain short-term redemption fees or restrictions may apply. Contributions may be invested into a self-directed brokerage account. Any contributions for which the participant does not provide investment direction are invested in the participant’s Qualified Default Investment Alternative (QDIA), which is the Vanguard Target Retirement Fund based on the participant’s year of birth.





The Plan’s trust agreement provides that any portion of any of the investment funds may, pending its permanent investment or distribution, be invested in short-term investments.





Eligibility





Generally, all U.S.-based employees of the Company are eligible to enroll in the Plan on their date of hire, except for certain employees who (i) are covered by a collective bargaining agreement and have not negotiated to participate in the Plan, (ii) are employed by an employee group not designated for participation in the Plan or (iii) are otherwise eligible for another Company-sponsored savings plan.





Newly eligible participants who do not affirmatively enroll in the Plan within 31 days of hire or transfer into eligible employment are automatically enrolled at a 6% before-tax contribution rate. Contributions are invested in the Plan’s QDIA fund based on the participant’s year of birth.





Notes Receivable from Participants


Participants may borrow from their account balances with the interest rate set at 1% above the prime rate. The minimum loan is $1,000 and the maximum loan is the lesser of (i) 50% of the vested account balance reduced by any current outstanding loan balance or (ii) $50,000, reduced by the current outstanding loan balance. Loans must be repaid within five years, unless the funds are used to purchase a primary residence. Primary residence loans must be repaid within 15 years. The repayment period for primary residence loans converted into the Plan from the Pharmacia Savings Plan is six to 10 years. Interest rates on outstanding loans ranged from 3.25% to 10.50% and 4.25% to 10.50% at December 31, 2017 and 2016, respectively.





Interest paid by the participant is credited to the participant’s account. Interest income from notes receivable from participants is recorded by the trustee as earned in the investment funds in the same proportion as the original loan issuance. Repayments may not necessarily be made to the same fund from which the amounts were borrowed. Repayments are credited to the applicable funds based on the participant’s investment elections at the time of repayment.








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PFIZER SAVINGS PLAN NOTES TO FINANCIAL STATEMENTS





In the event of termination, participants will have 90 days to repay the outstanding loan balance or to set up recurring monthly payments before it is considered a distribution and subject to ordinary income tax in the year it is considered distributed. In addition, a 10% excise tax will generally apply if the participant is younger than age 591⁄2 at the time the distribution occurs.





Payment of Benefits





Upon separation from service, retirement or total and permanent long-term disability, a participant whose account balance is greater than $1,000 is entitled to receive the full value of their account balance or defer payment to a later date, subject to receiving minimum required distributions starting at age 701⁄2. A participant whose account balance is $1,000 or less will receive his or her account balance upon termination. In the event of a participant’s death, a spouse beneficiary generally may elect a lump sum payment or defer payment until a later date, but not beyond the year in which the participant would have reached age 701⁄2. A non-spouse beneficiary generally may defer payment until December 31 st of the year following the date of the participant’s death.





In-Service Withdrawals





Participants in the Plan may make in-service or hardship withdrawals from their account balances, subject to the provisions of the Plan.





2. Summary of Significant Accounting Policies





Basis of Accounting





The financial statements of the Plan are prepared on the accrual basis of accounting.


Investment contracts held by a defined contribution plan are required to be reported at contract value. Contract value is the relevant measurement attribute for that portion of the net assets available for benefits of a defined contribution plan attributable to fully benefit-responsive investment contracts because contract value is the amount participants would receive if they were to initiate permitted transactions under the terms of the Plan. As required, the accompanying statements of net assets available for plan benefits present the contract value of the fully benefit-responsive investment contracts, and the statement of changes in net assets available for plan benefits are prepared on a contract value basis.





Some amounts in the financial statements, notes to financial statements and supplemental schedules of the Plan may not add due to rounding.





Use of Estimates





The preparation of financial statements in conformity with accounting principles generally accepted in the United States of America (U.S. GAAP) requires Plan management to make estimates and assumptions that affect the reported amounts of assets and liabilities and changes therein, and disclosure of contingent assets and liabilities. Actual results could differ from those estimates.





Investment  Valuation and Income Recognition





Common stock and self-directed brokerage accounts are valued at the closing market price on the last business day of the year. Mutual funds are recorded at fair value based on the closing market prices obtained from national exchanges of the underlying investments of the respective fund as of the last business day of the year. Common/collective trust funds (CCTs) are stated at redemption value as determined by the trustees of such funds based upon the underlying securities stated at fair value on the last business day of the year. The Plan generally has the ability to redeem its investments at the net asset value (NAV) at the valuation date. There are no significant restrictions, redemption terms, or holding periods that would limit the ability of the Plan or the participants to transact at the NAV. The T. Rowe Price Stable Value fund represents direct investments in Guaranteed Investment Contracts (GICs), Synthetic Investment Contracts (SICs) and Separate Account Contracts (SACs) that are fully benefit-responsive and reported at contract value as contract value is the relevant measurement. See Note 4, Investment Contracts ,  for additional information.








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PFIZER SAVINGS PLAN NOTES TO FINANCIAL STATEMENTS





The per-share stated value of the Pfizer Inc. preferred stock is $40,300 and each share is convertible, at the holder’s option, into 2,574.87 shares of Pfizer Inc. common stock. The Pfizer Inc. preferred stock may also be redeemed by Pfizer Inc. at any time or upon termination of the employee stock ownership plan trust in which it is held, at Pfizer Inc.’s option, in cash, in shares of common stock or a combination of both at a price of $40,300 per share. Pfizer Inc. preferred stock share balances maintained by the Plan’s trustee and recordkeeper are on a basis equal to a multiple of 1,000 of the share balance and one-thousandth of the $40,300 stated value and are valued using either the higher of the per-share equivalent stated value of $40.30 ($40,300 stated value divided by 1,000) or the quoted market price on the New York Stock Exchange of Pfizer Inc. common stock multiplied by 2.57487 on the last business day of the Plan year. At December 31, 2017 and 2016, Pfizer Inc. preferred stock was valued at $93.26 per share and $83.63 per share, respectively, based on the closing Pfizer Inc. common stock price of $36.22 per share and $32.48 per share on December 31, 2017 and 2016, respectively.





See Note 6, Fair Value Measurements ,  for additional information regarding the fair value of the Plan’s investments.





Purchases and sales of securities are recorded on a trade-date basis. Dividend income is recorded on the ex-dividend date. Interest income is recorded as earned. The net appreciation/(depreciation) in the fair value of investments consists of the realized gains or losses on the sales of investments and the net unrealized appreciation/(depreciation) of investments.





Notes Receivable from Participants





Notes receivable from participants, which are subject to various interest rates, are recorded at amortized cost.





Payment of Benefits





Benefits are recorded when paid.





Recently Issued Accounting Standard





In February 2017, the Financial Accounting Standards Board (FASB) issued new guidance on the presentation and disclosure requirements for employee benefit plans that hold interests in master trusts in the scope of Accounting Standards Codification (ASC) No 960, Plan Accounting – Defined Benefit Pension Plans , ASC 962, Plan Accounting – Defined Contribution Pension Plans and ASC 965, Plan Accounting – Health and Welfare Benefit Plans . The new guidance requires a plan’s interests in master trust balances and activities be presented in separate line items in the statement of net assets available for plan benefits and in the statement of changes in net assets available for plan benefits. The new guidance also requires certain disclosures regarding the master trust’s investments and other assets and liabilities. The effective date is January 1, 2019 and earlier application is permitted. The Plan currently does not have any interests in master trusts that are within the scope of the new guidance.





3. Tax Status





The Internal Revenue Service (IRS) has determined and informed the Plan Sponsor by letter dated April 18, 2018 that the Plan and related trust are designed in accordance with the applicable sections of the Code. The Company’s counsel believes the Plan is currently designed and being operated in compliance with the applicable requirements of the Code. Accordingly, no provision has been made for U.S. federal income taxes in the accompanying financial statements.





U.S. 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 Company’s counsel has confirmed that there are no uncertain positions taken that would require recognition of a liability (or asset) or disclosure in the 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 the Plan is generally no longer subject to income tax examinations for years prior to 2014 .





4. Investment Contracts





Participants in the Plan have a stable value investment option that invests in the T. Rowe Price Stable Value Fund composed of fully benefit-responsive SICs and SACs held directly. The contract value of the investment contracts represents contributions made under the contract and related earnings offset by participant withdrawals. There are no reserves against contract value for credit risk of the contract issuers or otherwise.





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PFIZER SAVINGS PLAN NOTES TO FINANCIAL STATEMENTS





The following represents the disaggregation of contract value between types of investment contracts held by the Plan:December 31,(THOUSANDS OF DOLLARS)20172016Synthetic investment contracts$1,167,312$1,159,438Separate account contracts241,524260,032Total$1,408,836$1,419,470





Investments underlying a synthetic structure are owned by a benefit plan or collective trust fund. SICs consist of a portfolio of underlying assets (which may include units of fixed income commingled or common trust funds) owned by a benefit plan or collective trust fund and a wrap contract issued by a financially responsible third party, typically an insurance company, bank or other financial services institution. The issuer of the wrap contract provides for unscheduled withdrawals from the contract at contract value, regardless of the value of the underlying assets, in order to fund routine permitted participant-initiated withdrawals from a stable value fund. SICs provide for a variable crediting rate, which typically resets at least quarterly, and the issuer of the wrap contract provides assurance that future adjustments to the crediting rate cannot result in a crediting rate less than zero.





SACs share certain attributes of both traditional and synthetic investment contracts. A SAC is a contract with a financially responsible counterparty, typically an insurance company. The issuer guarantees liquidity at contract value for permitted participant-initiated withdrawals from the collective trust fund and provides for a variable crediting rate, not less than zero, based on performance of an underlying portfolio of investments. The issuer accepts a deposit of cash and/or securities from the collective trust fund to create the underlying fixed income portfolio. The underlying portfolio holdings are owned by the issuer but are required to be segregated in a separate account and are designed to be protected from the claims of the issuer’s general creditors in the event of issuer insolvency. As with a SIC, to the extent the portfolio underlying a SAC is insufficient to cover payment obligations under the contract, the issuer is contractually obligated to make such payments in full. The SAC provides that gains and losses on the underlying portfolio accrue to the benefit of the trust. SACs have no stated maturity but may be discontinued by either party subject to any notice period under the terms of the SAC.





The crediting rate is based, in part, on the relationship between the contract value and the market value of the underlying assets, as well as previously realized gains and losses on underlying assets. The crediting rate will generally reflect, over time, movements in prevailing interest rates. However, at times the crediting rate may be more or less than prevailing rates or the actual income earned on the underlying assets. In most cases, realized and unrealized gains and losses on the underlying investments are not reflected immediately in the net assets of a stable value fund, but rather are amortized either over the time to maturity or the duration of the underlying investments, through adjustments to the future interest crediting rate.





The existence of certain conditions can limit a benefit plan’s or collective trust fund’s ability to transact at contract value with the issuers of its investment contracts. Specifically, any event outside the normal operation of a benefit plan or collective trust which causes a withdrawal from an investment contract may result in a contract value adjustment with respect to such withdrawal. Examples of such events include, but are not limited to, partial or complete legal termination of the plan or collective trust fund, tax disqualification, certain plan or trust amendments if issuer consent is not obtained, improper communications to participants, group terminations, group layoffs, early retirement programs, mergers, sales, spin-offs and bankruptcy. The Plan Sponsor does not believe the occurrence of any such event is probable.





In addition to the limitations noted above, issuers of investment contracts have certain rights to terminate a contract and settle at an amount that differs from contract value. For example, certain breaches by a benefit plan or the investment manager of their obligations, representations or warranties under the terms of an investment contract can result in its termination at market value, which may differ from contract value. Investment contracts may also provide for termination with no payment obligation from the issuer if the performance of the contract constitutes a prohibited transaction under ERISA or other applicable law. SICs and SACs may also provide issuers with the right to reduce contract value in the event an underlying security suffers a credit event or terminate the contract in the event certain investment guidelines are materially breached and not cured.





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PFIZER SAVINGS PLAN NOTES TO FINANCIAL STATEMENTS





5. Nonparticipant-Directed Investments


Information about the net assets and significant components of the changes in net assets relating to the nonparticipant-directed investments is as follows:As of December 31,(THOUSANDS OF DOLLARS)20172016Net assetsInvestments, at fair valuePfizer Inc. common stock$1,251,905$1,225,590Pfizer Inc. preferred stock46,32247,662Common/collective trust funds9,2798,497Total investments, at fair value1,307,5061,281,749ReceivablesSecurities sold—779Interest and other2—Total receivables2779Net assets available for plan benefits$1,307,509$1,282,528


(THOUSANDS OF DOLLARS)Year Ended December 31, 2017Changes in net assetsInvestment incomeNet appreciation in investments$138,739Pfizer Inc. common stock dividends46,228Pfizer Inc. preferred stock dividends1,366Interest and dividend income from other investments75Total investment income186,407Less: Investment management, redemption and loan fees(212)Net investment and interest income186,196Benefits paid and transfersBenefits paid to participants(97,342)Transfers to participant-directed investments(63,873)Total benefits paid and transfers(161,216)Net increase24,980Net assets available for plan benefitsBeginning of year1,282,528End of year$1,307,509





6. Fair Value Measurements





The framework for measuring fair value provides a fair value hierarchy that prioritizes the inputs to valuation techniques used to measure fair value. Fair value is defined as the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. There are three levels of inputs to fair value measurements - Level 1 meaning the use of quoted prices for identical instruments in active markets; Level 2 meaning the use of quoted prices for similar instruments in active markets or quoted prices for identical or similar instruments in markets that are not active or are directly or indirectly observable; and Level 3 meaning the use of unobservable inputs.





See Note 2, Summary of Significant Accounting Policies: Investment Valuation and Income Recognition , for information regarding the methods used to determine the fair value of the Plan’s investments. These methods may produce a fair value calculation that may not be indicative of net realizable value or reflective of future fair values. Furthermore, while the Plan believes its valuation methods are appropriate and consistent with other market participants, the use of different methodologies or assumptions to determine the fair value of certain financial instruments could result in a different fair value measurement at the reporting date.





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PFIZER SAVINGS PLAN NOTES TO FINANCIAL STATEMENTS





The following tables set forth by level, within the fair value hierarchy, the Plan’s investments at fair value:Fair Value as of December 31, 2017(THOUSANDS OF DOLLARS)Level 1Level 2Level 3TotalPfizer Inc. common stock$1,841,995$—$—$1,841,995Pfizer Inc. preferred stock—46,322—46,322Common/collective trust funds—8,093,269—8,093,269Mutual funds1,531,351——1,531,351Self-directed brokerage account203,851——203,851Total$3,577,197$8,139,591$—$11,716,788


Fair Value as of December 31, 2016(THOUSANDS OF DOLLARS)Level 1Level 2Level 3TotalPfizer Inc. common stock$1,786,627$—$—$1,786,627Pfizer Inc. preferred stock—47,662—47,662Common/collective trust funds—6,616,672—6,616,672Mutual funds1,383,443——1,383,443Self-directed brokerage account174,756——174,756Total$3,344,826$6,664,334$—$10,009,160





7. Related Party Transactions and Party-In-Interest Transactions





Northern Trust, the trustee of the Plan, manages investments in its sponsored funds and, therefore, is deemed a party-in-interest and a related party. Fidelity, the recordkeeper of the Plan, manages investments in its sponsored funds and, therefore, is deemed a party-in-interest and a related party. The Plan also invests in shares of the Plan Sponsor; therefore, these transactions qualify as party-in-interest transactions.





8. Plan Termination





Although it has not expressed any intent 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 of ERISA. In the event of termination of the Plan, each participant shall be entitled to the full value of his or her account balance as though he or she had retired as of the date of such termination. No part of the invested assets established pursuant to the Plan will at any time revert to the Company, except as otherwise permitted under ERISA.





9. Risks and Uncertainties





Investment securities, including Pfizer Inc. common and preferred stock, are exposed to various risks, such as interest rate, market and credit risks. Due to the level of risk associated with certain investment securities, it is at least reasonably possible that changes in their fair values will occur in the near term and that such changes could materially affect participants’ account balances and the amounts reported in the statements of net assets available for plan benefits.





10. Reconciliation of Financial Statements to Form 5500





Amounts allocated to withdrawing participants are recorded as benefits paid on Form 5500 for benefit claims that have been processed and approved for payment prior to December 31 st but not yet paid as of that date. Deemed distributions, representing withdrawing participants with outstanding loan balances for which no post-default payment activity has occurred, are not reported on Form 5500 in net assets available for plan benefits. Also, investments in the T. Rowe Price Stable Value Fund representing fully benefit-responsive investment contracts are reported on Form 5500 at fair value, whereas the net assets available for plan benefits in the financial statements report such investments at contract value.





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PFIZER SAVINGS PLAN NOTES TO FINANCIAL STATEMENTS





The following is a reconciliation of net assets available for plan benefits per the financial statements to the Form 5500:December 31,(THOUSANDS OF DOLLARS)20172016Net assets available for plan benefits per the financial statements$13,308,276$11,593,906Adjustment of T. Rowe Price Stable Value Fund from contract value to fair value(2,718)1,254Amounts allocated to withdrawing participants(1,308)(2,387)Deemed distributions(1,847)(1,820)Net assets available for plan benefits per Form 5500$13,302,403$11,590,953


The following is a reconciliation of benefits paid, including rollovers, to participants per the financial statements to the Form 5500:(THOUSANDS OF DOLLARS)Year Ended December 31, 2017Benefits paid to participants, including rollovers, per the financial statements$914,604Amounts allocated to withdrawing participants and deemed distributions at end of year3,155Amounts allocated to withdrawing participants and deemed distributions at beginning of year(4,207)Benefits paid to participants, including rollovers, per Form 5500$913,552


The following is a reconciliation of net appreciation in investments per the financial statements to the Form 5500:(THOUSANDS OF DOLLARS)Year Ended December 31, 2017Net appreciation in investments per the financial statements$1,813,102Adjustment of T. Rowe Price Stable Value Fund from contract value to fair value at end of year(2,718)Adjustment of T. Rowe Price Stable Value Fund from contract value to fair value at beginning of year(1,254)Net appreciation in investments per Form 5500$1,809,130





11. Subsequent Events





On September 3, 2015, the Company acquired Hospira, Inc. (Hospira). In connection with the acquisition, the Company adopted and assumed sponsorship of the Hospira 401(k) Retirement Plan (Hospira Plan), effective September 3, 2015. On January 1, 2018, Hospira colleagues became eligible for the Plan, and the Hospira Plan was merged into the Plan on January 9, 2018.





On September 28, 2016, the Company acquired Medivation, Inc. (Medivation). In connection with the acquisition, the Company adopted and assumed sponsorship of the Medivation 401(k) Plan (Medivation Plan), effective September 28, 2016. On January 1, 2018, Medivation colleagues became eligible for the Plan, and the Medivation Plan was merged into the Plan on January 24, 2018.





The Plan Sponsor has evaluated subsequent events from the statement of net assets available for plan benefits date through June 28, 2018, the date at which the financial statements were available to be issued, and determined there were no additional items to disclose.





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PFIZER SAVINGS PLANSCHEDULE H, LINE 4i - SCHEDULE OF ASSETS (HELD AT END OF YEAR)As of December 31, 2017(THOUSANDS OF DOLLARS)Identity of Issuer, Borrower, Lessoror Similar PartyDescription of InvestmentRate of InterestMaturityDateNumber of Sharesor UnitsCostCurrent Value*Pfizer Inc. Common StockCommon stock50,855,746$1,185,970$1,841,995*Pfizer Inc. Preferred StockPreferred stock496,68620,02646,322*NTGI Collective Government Short-TermInvestment FundCollective trust fund69,129,43369,12969,129*NTGI – Russell 2000 Small Cap Index FundCollective trust fund152,082211,014327,857*NTGI – S&P 500 Index FundCollective trust fund200,756906,1651,838,535BlackRock MidCap Equity Index FundCollective trust fund6,392,838435,551565,417BlackRock International Equity Index FundCollective trust fund4,203,49048,67258,774*Fidelity Large Cap Growth FundCollective trust fund72,572,4941,243,5441,381,780Oppenheimer Developing Markets FundCollective trust fund3,352,849161,165185,983Boston Partners Large Cap Value FundCollective trust fund20,952,819321,167466,575Vanguard Target Retirement Income Trust SelectCollective trust fund8,624,094227,368292,184Vanguard Target Retirement 2015 Trust SelectCollective trust fund2,039,98857,44170,747Vanguard Target Retirement 2020 Trust SelectCollective trust fund16,632,344403,951590,615Vanguard Target Retirement 2025 Trust SelectCollective trust fund10,823,522313,406390,296Vanguard Target Retirement 2030 Trust SelectCollective trust fund20,711,211496,890754,924Vanguard Target Retirement 2035 Trust SelectCollective trust fund8,580,085244,939316,348Vanguard Target Retirement 2040 Trust SelectCollective trust fund13,377,796323,414498,189Vanguard Target Retirement 2045 Trust SelectCollective trust fund4,340,544126,309162,727Vanguard Target Retirement 2050 Trust SelectCollective trust fund2,008,67958,99875,265Vanguard Target Retirement 2055 Trust SelectCollective trust fund1,127,74433,62542,234Vanguard Target Retirement 2060 Trust SelectCollective trust fund151,9165,1595,691Total common/collective trust funds5,687,9088,093,269T. Rowe Price Small Cap Stock FundMutual fund16,370,798337,086388,315Dodge & Cox International FundMutual fund13,033,913451,514603,731Diversified Bond Fund – CoreMutual fund44,516,681467,112458,077Diversified Bond Fund – High YieldMutual fund9,035,37080,43681,228Total mutual funds1,336,1491,531,351*****Self-Directed Brokerage AccountSelf-directed brokerage account203,851


- continued -





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PFIZER SAVINGS PLANSCHEDULE H, LINE 4i - SCHEDULE OF ASSETS (HELD AT END OF YEAR)As of December 31, 2017(THOUSANDS OF DOLLARS)(continued)Identity of Issuer, Borrower, Lessor, or Similar PartyDescription of InvestmentRate of InterestMaturity DateNumber of Shares or UnitsCostCurrent ValueT. Rowe Price Stable Value Fund –***American General Life Insurance Company Contract #GA-IM-266-1658155Synthetic investment contract2.37%**187,249,424$187,249$187,249***Great-West Financial Contract #939983-01Synthetic investment contract1.10%**621,675622622***JPMorgan Securities, LLCContract #ATRPPFIZER 01Synthetic investment contract2.39%**163,634,781163,635163,635***New York Life Insurance CompanyGIC Contract #GA-29302Synthetic investment contract2.30%**144,097,957144,098144,098***The Prudential Insurance Company ofAmerica Contract #GA-63191Synthetic investment contract2.36%**236,321,335236,321236,321***Royal Bank of Canada Contract#TRPPFIZER01Synthetic investment contract2.36%**151,292,910151,293151,293***State Street Bank and Trust CompanyContract #96028Synthetic investment contract2.42%**284,093,637284,094284,094***Metropolitan Life Insurance CompanyContract #32392Separate account contract2.55%**241,524,184241,524241,524Total T. Rowe Price Stable Value Fund1,408,8361,408,836Total investments13,125,624*Notes receivable from participantsInterest Rates: 3.25% - 10.50%79,882Maturity Dates: 2018 - 2032Total$13,205,506


|  |                                      
|- | -------------------------------------
|* | Party-in-interest as defined by ERISA

|   |                    
|-- | -------------------
|** | Open-ended maturity

|    |                                        
|--- | ---------------------------------------
|*** | Current value represents contract value

|     |                                                                                                                                                                                                      
|---- | -----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
|**** | Cost information omitted as all investments are fully participant-directed. This information is not required by ERISA or the Department of Labor to be reported for participant-directed investments.

See accompanying Report of Independent Registered Public Accounting Firm.





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PFIZER SAVINGS PLANSCHEDULE H, LINE 4j - SCHEDULE OF REPORTABLE TRANSACTIONSYear Ended December 31, 2017(THOUSANDS OF DOLLARS)Identity of Party InvolvedDescription of AssetPurchase PriceSelling PriceCost of AssetCurrent value of asset on transaction dateNet gain/(loss)NTGI Collective Government Short-Term Investment Fund*Collective trust fund shares – 134 acquisitions$133,727$—$133,727$133,727$—NTGI Collective Government Short-Term Investment Fund*Collective trust fund shares – 368 dispositions—133,010133,010133,010—


|  |                                       
|- | --------------------------------------
|* | Party-in-interest as defined by ERISA.

See accompanying Report of Independent Registered Public Accounting Firm.





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Exhibit IndexExhibit 23.1-Consent of Independent Registered Public Accounting Firm








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SIGNATURE


Pursuant to the requirements of the Securities Exchange Act of 1934, the members of the Savings Plan Committee have duly caused this annual report to be signed on its behalf by the undersigned thereunto duly authorized.


PFIZER SAVINGS PLANBy:/s/ Brian McMahonBrian McMahonMember, Savings Plan Committee


Date: June 28, 2018





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