(Mark One)

Commission file number:               1-1136

(Exact name of registrant as specified in its charter)

430 E. 29th Street, 14FL, New York, N.Y. 10016

(Address of principal executive offices) (Zip Code)

(212) 546-4000

(Registrant's telephone number, including area code)

(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 (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to the 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 whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer or a smaller reporting company. See definition of "accelerated filer", "large accelerated filer" and "smaller reporting company" in Rule 12b-2 of the Exchange Act. (Check one):

Large accelerated filer   x    Accelerated filer   ¨    Non-accelerated filer   ¨    Smaller reporting company   ¨    Emerging growth company   ¨

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ¨

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

APPLICABLE ONLY TO CORPORATE ISSUERS:

At June 30, 2018 , there were 1,631,876,909 shares outstanding of the Registrant's $0.10 par value common stock.

BRISTOL-MYERS SQUIBB COMPANY

INDEX TO FORM 10-Q

JUNE 30, 2018

*    Indicates brand names of products which are trademarks not owned by BMS. Specific trademark ownership information is included in the Exhibit Index.

PART I-FINANCIAL INFORMATION

Item 1. FINANCIAL STATEMENTS

BRISTOL-MYERS SQUIBB COMPANY

CONSOLIDATED STATEMENTS OF EARNINGS

Dollars in Millions, Except Per Share Data

(UNAUDITED)

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME

Dollars in Millions

(UNAUDITED)

The accompanying notes are an integral part of these consolidated financial statements.

BRISTOL-MYERS SQUIBB COMPANY

CONSOLIDATED BALANCE SHEETS

Dollars in Millions

The accompanying notes are an integral part of these consolidated financial statements.

BRISTOL-MYERS SQUIBB COMPANY

CONSOLIDATED STATEMENTS OF CASH FLOWS

Dollars in Millions

(UNAUDITED)

The accompanying notes are an integral part of these consolidated financial statements.

Note 1 . BASIS OF PRESENTATION AND RECENTLY ISSUED ACCOUNTING STANDARDS

Bristol-Myers Squibb Company prepared these unaudited consolidated financial statements following the requirements of the SEC and U.S. GAAP for interim reporting. Under those rules, certain footnotes and other financial information that are normally required for annual financial statements can be condensed or omitted. The Company is responsible for the consolidated financial statements included in this Quarterly Report on Form 10-Q, which include all adjustments necessary for a fair presentation of the financial position at June 30, 2018 and December 31, 2017 , the results of operations for the three and six months ended June 30, 2018 and 2017 , and cash flows for the six months ended June 30, 2018 and 2017 . All intercompany balances and transactions have been eliminated. These financial statements and the related notes should be read in conjunction with the audited consolidated financial statements for the year ended December 31, 2017 included in the 2017 Form 10-K. Refer to the Summary of Abbreviated Terms at the end of this Quarterly Report on Form 10-Q for terms used throughout the document.

Revenues, expenses, assets and liabilities can vary during each quarter of the year. Accordingly, the results and trends in these unaudited consolidated financial statements may not be indicative of full year operating results. The preparation of financial statements requires the use of management estimates, judgments and assumptions. The most significant assumptions are estimates used in determining sales rebate and return accruals; legal contingencies; income taxes; determining if an acquisition or divestiture is a business or an asset; and pension and postretirement benefits. Actual results may differ from estimates.

Certain prior period amounts were reclassified to conform to the current period presentation. Loss/(gain) on equity investments previously presented in Other adjustments in the consolidated statements of cash flows is now presented separately. The reclassification provides a more detailed financial statement presentation.

Recently Adopted Accounting Standards

Revenue from Contracts with Customers

Amended guidance for revenue recognition was adopted in the first quarter of 2018 using the modified retrospective method with the cumulative effect of the change recognized in Retained earnings. The new guidance, referred to as ASC 606, requires an entity to recognize the amount of revenue to which it expects to be entitled for the transfer of promised goods or services to customers and replaces most of the existing revenue recognition standards in U.S. GAAP. A five-step model is utilized to achieve the core principle: (1) identify the customer contract; (2) identify the contract's performance obligation; (3) determine the transaction price; (4) allocate the transaction price to the performance obligation; and (5) recognize revenue when or as a performance obligation is satisfied.

The timing of recognizing revenue for typical net product sales to our customers did not significantly change. However, transaction prices are no longer required to be fixed or determinable and certain variable consideration might be recognized prior to the occurrence or resolution of the contingent event. As a result, certain revenue previously deferred under the prior standard because the transaction price was not fixed or determinable is now accounted for as variable consideration and might be recognized earlier provided such terms are sufficient to reliably estimate the ultimate price expected to be realized.

Estimated future royalties and contingent fees related to certain alliance arrangements are now recognized prior to the third party sale or event occurring to the extent it is probable that a significant reversal in the amount of estimated cumulative revenue will not occur. The new guidance pertaining to the separation of licensing rights and related fee recognition did not significantly change the timing of recognizing revenue in our existing alliance arrangements that are currently generating revenue. The timing of royalties, sales-based milestones and other forms of contingent consideration resulting from the divestiture of businesses as well as royalties and sales-based milestones from licensing arrangements did not change.

The cumulative effect of the accounting change resulted in recognizing contract assets of $214 million and a $168 million increase in Retained earnings net of tax. The cumulative effect was primarily attributed to royalties and licensing rights reacquired by alliance partners that are expected to be received in the future and are not eligible for the licensing exclusion. As a result of the new guidance and cumulative effect adjustment, revenue was approximately $57 million and $118 million lower in the three and six months ended June 30, 2018 , respectively, compared to what would have been reported under the previous guidance. Refer to "-Note 3 . Revenue Recognition " for further information.

Gains and Losses from the Derecognition of Nonfinancial Assets

Amended guidance for gains and losses from the derecognition of nonfinancial assets (ASC 610) was adopted in the first quarter of 2018 using the modified retrospective method. The amendments clarify the scope of asset derecognition guidance, add guidance for partial sales of nonfinancial assets and clarify recognizing gains and losses from the transfer of nonfinancial assets in contracts with noncustomers. Certain transactions such as the sale or out-licensing of product rights that do not constitute a business will require accounting similar to ASC 606 including the potential recognition of variable consideration. The amended guidance may result in earlier recognition of variable consideration depending on the facts and circumstances of each transaction.

The cumulative effect of the accounting change resulted in recognizing contract assets of $167 million and a $130 million increase in Retained earnings net of tax. The cumulative effect was primarily attributed to royalties and termination fees for licensing rights reacquired by third parties that are expected to be received in the future and are not eligible for the licensing exclusion. As a result of the new guidance and cumulative effect adjustment, Other income (net) was approximately $5 million and $12 million lower in the three and six months ended June 30, 2018 , respectively, compared to what would have been reported under the previous guidance.

Presentation of Net Periodic Pension and Postretirement Benefits

Amended guidance requiring all net periodic benefit components for defined benefit pension and other postretirement plans other than service costs to be recorded outside of income from operations (other income) was adopted in the first quarter of 2018 on a retrospective basis. Cost of products sold; Marketing, selling and administrative; and Research and development expenses increased in the aggregate with a corresponding offset in Other income (net).

As adjusted amounts upon adoption of the new guidance are as follows:

Definition of a Business

Amended guidance which revises the definition of a business was adopted prospectively in the first quarter of 2018. The amendment provides an initial screen that when substantially all of the fair value of the gross assets acquired or disposed of is concentrated in a single identifiable asset or a group of similar identifiable assets, an integrated set of assets and activities would not represent a business. If the screen is not met, the set must include an input and a substantive process that together significantly contributes to the ability to create outputs for the set to represent a business. The amendment also narrows the definition of the term "output" and requires the transfer of an organized work force when outputs do not exist. The amended guidance may result in more transactions being accounted for as assets in the future with the impact to our results of operations dependent on the individual facts and circumstances of each transaction.

Recognition and Measurement of Financial Assets and Liabilities

Amended guidance for the recognition, measurement, presentation and disclosure of financial instruments was adopted using the modified retrospective method in the first quarter of 2018. The new guidance requires that fair value adjustments for equity investments with readily determinable fair values be reported through earnings. The new guidance also requires a qualitative impairment assessment for equity investments without a readily determinable fair value based upon observable price changes and a charge through earnings if an impairment exists. The cumulative effect of the accounting change resulted in a $36 million reduction to Other Comprehensive Income and a corresponding increase to Retained earnings ( $34 million net of tax). Losses related to equity investment fair value adjustments of $356 million and $341 million were recorded in Other income (net) for the three and six months ended June 30, 2018 , respectively, and additional volatility is expected in future results of operations.

Accounting for Hedging Activities

Amended guidance for derivatives and hedging was adopted using the modified retrospective method in the first quarter of 2018. The amended guidance revises and expands items eligible for hedge accounting, simplifies hedge effectiveness testing and changes the timing of recognition and presentation for certain hedged items. Certain disclosure requirements were also modified for hedging activities on a prospective basis. The adoption of the amended standard did not have a material impact on the Company's results of operations.

Recently Issued Accounting Standards Not Yet Adopted

Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income

In February 2018, the FASB issued amended guidance on income tax accounting. The amended guidance permits the reclassification of the income tax effect on amounts recorded within Other Comprehensive Income impacted by the Tax Cuts and Jobs Act into Retained earnings. The amended guidance is effective for periods ending after December 15, 2018 and applies only to those amounts remaining in Other Comprehensive Income at the date of enactment of the Act. The amended guidance may be adopted on either a retrospective basis or at the beginning of the period of adoption. The Company is assessing the potential impact of the amended standard.

Note 2 . BUSINESS SEGMENT INFORMATION

BMS operates in a single segment engaged in the discovery, development, licensing, manufacturing, marketing, distribution and sale of innovative medicines that help patients prevail over serious diseases. A global research and development organization and supply chain organization are responsible for the discovery, development, manufacturing and supply of products. Regional commercial organizations market, distribute and sell the products. The business is also supported by global corporate staff functions. The determination of a single segment is consistent with the financial information regularly reviewed by the chief executive officer for purposes of evaluating performance, allocating resources, setting incentive compensation targets and planning and forecasting future periods. For further information on product and regional revenues, see "-Note 3 . Revenue Recognition ."

Note 3 . REVENUE RECOGNITION

The following table summarizes the disaggregation of revenue by nature:

Net product sales represent more than 90% of the Company's total revenue during the three and six months ended June 30, 2018 and 2017 . Products are sold principally to wholesalers or distributors and to a lesser extent, directly to retailers, hospitals, clinics, government agencies and pharmacies. Customer orders are generally fulfilled within a few days of receipt resulting in minimal order backlog. Contractual performance obligations are usually limited to transfer of control of the product to the customer. The transfer occurs either upon shipment or upon receipt of the product in certain non-U.S. countries after considering when the customer obtains legal title to the product and when the Company obtains a right of payment. At these points, customers are able to direct the use of and obtain substantially all of the remaining benefits of the product.

Wholesalers are initially invoiced at contractual list prices. Payment terms are typically 30 to 90 days based on customary practices in each country with the exception of certain biologic products in the U.S., including Opdivo , Yervoy and Empliciti ( 90 days to 120 days). Revenue is reduced from wholesaler list price at the time of recognition for expected charge-backs, discounts, rebates, sales allowances and product returns, which are referred to as gross-to-net (GTN) adjustments. These reductions are attributed to various commercial arrangements, managed healthcare organizations and government programs such as Medicare, Medicaid and the 340B Drug Pricing Program containing various pricing implications such as mandatory discounts, pricing protection below wholesaler list price or other discounts when Medicare Part D beneficiaries are in the coverage gap. In addition, non-U.S. government programs include different pricing schemes such as cost caps, volume discounts, outcome-based pricing and pricing claw-backs determined on sales of individual companies or an aggregation of companies participating in a specific market. Charge-backs and cash discounts are reflected as a reduction to receivables and settled through the issuance of credits to the customer, typically within one month. All other rebates, discounts and adjustments, including Medicaid and Medicare, are reflected as a liability and settled through cash payments to the customer, typically within various time periods ranging from a few months to one year.

Significant judgment is required in estimating GTN adjustments considering legal interpretations of applicable laws and regulations, historical experience, payer channel mix, current contract prices under applicable programs, unbilled claims, processing time lags and inventory levels in the distribution channel.

The following table summarizes GTN adjustments:

Alliance and other revenues consist primarily of amounts related to collaborations and out-licensing arrangements. Such arrangements may include the transfer of certain rights to develop or commercialize investigational compounds or products and joint obligations to provide development, distribution, promotion, sales and marketing services and clinical or commercial product supply. Each of these arrangements are evaluated for whether they represent contracts that are within the scope of the revenue recognition guidance in their entirety or contain aspects that are within the scope of the guidance, either directly or by reference based upon the application of the guidance related to the derecognition of nonfinancial assets (ASC 610). Performance obligations are identified and separated when the other party can benefit directly from the rights, goods or services either on their own or together with other readily available resources and when the rights, goods or services are not highly interdependent or interrelated.

Transaction prices for these arrangements may include fixed up-front amounts as well as variable consideration such as contingent development and regulatory milestones, sales-based milestones and royalties. The most likely amount method is used to estimate contingent development, regulatory and sales-based milestones because the ultimate outcomes are binary in nature. The expected value method is used to estimate royalties because a broad range of potential outcomes exist, except for instances in which such royalties relate to a license. Variable consideration is included in the transaction price only to the extent a significant reversal in the amount of cumulative revenue recognized is not probable of occurring when the uncertainty associated with the variable consideration is subsequently resolved. Significant judgment is required in estimating the amount of variable consideration to recognize when assessing factors outside of BMS's influence such as likelihood of regulatory success, limited availability of third party information, expected duration of time until resolution, lack of relevant past experience, historical practice of offering fee concessions and a large number and broad range of possible amounts. To the extent arrangements include multiple performance obligations that are separable, the transaction price assigned to each distinct performance obligation is reflective of the relative stand-alone selling price and recognized at a point in time upon the transfer of control.

We have three types of out-licensing arrangements: 1) straight license arrangements, when we out-license intellectual property to another party and have no further performance obligations; 2) arrangements that include a license and an additional performance obligation to supply product upon the request of the third party; and 3) collaboration arrangements, which include transferring a license to a third party to jointly develop and commercialize a product.

Most of our out-licensing arrangements have a single performance obligation satisfied upon the rights transferred to a third party with no additional continuing involvement. In arrangements that include a license plus a contingent supply obligation, the items are not combined into a single performance obligation. Transfer of control for the license occurs upon execution of the agreement. Contingent development and regulatory milestones are allocated to the license and recognized upon transfer of control subject to the constraint discussed above. Sales-based milestones and royalties are allocated to the license and recognized when the milestone is achieved or the subsequent sales occur. Consideration is received for the supply under "cost plus" arrangements, which approximate stand alone selling prices. Royalties are presented in Alliance and other revenues (excluding those related to divestitures) and contingent milestones are presented in Other income (net). Supply sales to other parties in which product rights have been transferred to the counterparty are typically distinct and are recognized at a point in time upon transfer of control and included in Alliance and other revenues.

Amounts received from collaboration partners related to upfront fees or contingent development or regulatory milestones are recognized ratably over time as the license is combined with other performance obligations such as development and commercial activities and included in Other income (net). Profit sharing amounts payable to BMS by collaboration partners are recognized in Alliance and other revenues once earned as such amounts are related to third-party sales. Supply sales to alliance partners in which product rights have been transferred to the counterparty are typically distinct and are recognized at a point in time upon transfer of control. Refer to "-Note 4. Alliances" for further information.

The following table summarizes the disaggregation of revenue by product and region:

The following table summarizes contract assets as of June 30, 2018 and January 1, 2018:

Contract assets are primarily estimated future royalties and termination fees not eligible for the licensing exclusion and therefore recognized upon the adoption of ASC 606 and ASC 610. Contract assets are reduced and receivables are increased in the period the underlying sales occur. Contingent development and regulatory milestones from out-licensing arrangements of $1.3 billion were constrained and not recognized after considering the likelihood of a significant reversal of cumulative amount of revenue occurring. Cumulative catch-up adjustments to revenue affecting contract assets or contract liabilities were not material during the three and six months ended June 30, 2018 . Revenue recognized from performance obligations satisfied in prior periods was approximately $150 million and $300 million in the three and six months ended June 30, 2018 , consisting primarily of royalties for out-licensing arrangements and revised estimates for gross-to-net adjustments related to prior period sales.

Sales commissions and other incremental costs of obtaining customer contracts are expensed as incurred as the amortization periods would be less than one year.

Note 4 . ALLIANCES

BMS enters into collaboration arrangements with third parties for the development and commercialization of certain products. Although each of these arrangements is unique in nature, both parties are active participants in the operating activities of the collaboration and are exposed to significant risks and rewards depending on the commercial success of the activities. BMS may either in-license intellectual property owned by the other party or out-license its intellectual property to the other party. These arrangements also typically include research, development, manufacturing and/or commercial activities and can cover a single investigational compound or commercial product or multiple compounds and/or products in various life cycle stages. The rights and obligations of the parties can be global or limited to geographic regions. We refer to these collaborations as alliances and our partners as alliance partners. Products sold through alliance arrangements in certain markets include prioritized products and certain other brands.

Selected financial information pertaining to our alliances was as follows, including net product sales when BMS is the principal in the third-party customer sale for products subject to the alliance. Expenses summarized below do not include all amounts attributed to the activities for the products in the alliance, but only the payments between the alliance partners or the related amortization if the payments were deferred or capitalized. Certain prior period amounts included below were revised to exclude amounts for arrangements that no longer meet the criteria for collaboration arrangements.

The nature and purpose, significant rights and obligations of the parties and specific accounting policy elections for each of our significant alliances are discussed in our 2017 Form 10-K. Significant developments and updates related to alliances during 2018 are set forth below.

Nektar

In the second quarter of 2018, BMS and Nektar commenced a worldwide license and collaboration for the development and commercialization of NKTR-214, Nektar's investigational immuno-stimulatory therapy designed to selectively expand specific cancer-fighting T cells and natural killer cells directly in the tumor micro-environment. The Opdivo and NKTR-214 combination therapy is currently in Phase II clinical studies. A joint development plan agreed by the parties contemplates development in various indications and tumor types with each party responsible for the supply of their own product. BMS's share of the development costs associated with therapies comprising a BMS medicine used in combination with NKTR-214 is 67.5% , subject to certain cost caps for Nektar. The parties will also jointly commercialize the therapies, subject to regulatory approval. BMS's share of global NKTR-214 profits and losses will be 35% subject to certain annual loss caps for Nektar.

BMS paid Nektar $1.85 billion for the rights discussed above and 8.3 million shares of Nektar common stock representing a 4.8% ownership interest. BMS's equity ownership is subject to certain lock-up, standstill and voting provisions for a five -year period. The amount of the up-front payment allocated to the equity investment was $800 million after considering Nektar's stock price on the date of closing and current limitations on trading the securities. The remaining $1.05 billion of the upfront payment was allocated to the rights discussed above and included in research and development expense in the second quarter of 2018. BMS will also pay up to $1.8 billion upon the achievement of contingent development, regulatory and sales-based milestones over the life of the collaboration period.

Note 5 . DIVESTITURES AND LICENSING ARRANGEMENTS

Divestitures

Manufacturing Operations

In the fourth quarter of 2017, BMS sold its small molecule active pharmaceutical ingredient manufacturing operations in Swords, Ireland to SK Biotek for approximately $165 million , subject to certain adjustments. The transaction was accounted for as the sale of a business and proceeds of $159 million were received in 2018. SK Biotek will provide certain manufacturing services for BMS through 2022.

Diabetes Business

In the first quarter of 2017, BMS received $100 million from AstraZeneca as additional contingent consideration for the diabetes business divestiture upon achievement of a regulatory approval milestone, which was included in Other income (net).

Other Divestitures

Other divestitures include proceeds, gains and royalty income from the sale of certain mature brands. Revenues and pretax earnings related to all divestitures were not material in all periods presented.

Licensing Arrangements

Biogen

In the second quarter of 2017, BMS out-licensed to Biogen exclusive rights to develop and commercialize BMS-986168, an anti-eTau compound in development for Progressive Supranuclear Palsy. Biogen paid $300 million to BMS which was included in Other income (net). BMS is also entitled to contingent development, regulatory and sales-based milestone payments of up to $410 million if achieved and future royalties. BMS originally acquired the rights to this compound in 2014 through its acquisition of iPierian. Biogen assumed all of BMS's remaining obligations to the former stockholders of iPierian.

Roche

In the second quarter of 2017, BMS out-licensed to Roche exclusive rights to develop and commercialize BMS-986089, an anti-myostatin adnectin in development for Duchenne Muscular Dystrophy. Roche paid $170 million to BMS which was included in Other income (net). BMS is also entitled to contingent development and regulatory milestone payments of up to $205 million if achieved and future royalties.

Note 6 . OTHER INCOME (NET)

Note 7 . RESTRUCTURING

In October 2016, the Company announced a restructuring plan to evolve and streamline its operating model. The majority of the charges are expected to be incurred through 2020, range between $1.5 billion to $2.0 billion and consist of employee termination benefit costs, contract termination costs, plant and equipment accelerated depreciation and impairment charges and other shutdown costs associated with early manufacturing and R&D site exits. Cash outlays in connection with these actions are expected to be approximately 40% to 50% of the total charges. Charges of approximately $922 million have been recognized for these actions since the announcement ( $124 million and $452 million for the six months ended June 30, 2018 and 2017 , respectively). Restructuring charges are recognized upon meeting certain criteria, including finalization of committed plans, reliable estimates and discussions with local works councils in certain markets.

Employee workforce reductions were approximately 300 and 1,000 for the six months ended June 30, 2018 and 2017 , respectively.

The following tables summarize the charges and activity related to the restructuring actions:

Note 8 . INCOME TAXES

New tax reform legislation in the U.S. was enacted on December 22, 2017 known as the Tax Cuts and Jobs Act of 2017 (the Act). The Act moves from a worldwide tax system to a quasi-territorial tax system and comprises broad and complex changes to the U.S. tax code including, but not limited to, (1) reducing the U.S. tax rate from 35% to 21% ; (2) adding a deemed repatriation transition tax on certain foreign earnings and profits; (3) generally eliminating U.S. federal income taxes on dividends from foreign subsidiaries; (4) including certain income of controlled foreign companies in U.S. taxable income; (5) creating a new minimum tax referred to as a base erosion anti-abuse income tax; (6) limiting certain research-based credits; and (7) eliminating the domestic manufacturing deduction.

Although many aspects of the Act were not effective until 2018, additional tax expense of $2.9 billion was recognized in the fourth quarter of 2017 upon its enactment, including a $2.6 billion one-time deemed repatriation transition tax on previously untaxed post-1986 foreign earnings and profits (including related tax reserves). The accounting for the $2.6 billion was and continues to be incomplete as we do not have all of the necessary information available, prepared and analyzed to complete the accounting. However, a reasonable estimate of this tax was recorded as a provisional amount. The provisional amount was reduced by $29 million in 2018, and may continue to change until completed in 2018 upon finalizing the 2017 taxable income, untaxed post-1986 foreign earnings and profits and related cash and certain eligible assets of the specified foreign corporations or if additional interpretations of the relevant tax code are released.

The provisional adjustment discussed above, jurisdictional tax rates and other tax impacts attributed to non-deductible R&D charges, Nektar equity investment losses and other specified items increased the effective tax rate by 0.9% in the six months ended June 30, 2018 and 3.5% in the six months ended June 30, 2017 . These items increased the effective tax rate by 8.6% in the second quarter of 2018 and by 6.4% in the second quarter of 2017. The tax impact of these discrete items are reflected immediately and are not considered in estimating the annual effective tax rate. Excluding the impact of these items, the reduction in the effective tax rate from the prior year was due primarily to the impact of U.S. tax reform discussed above partially offset by earnings mix. Additional changes to the effective tax rate may occur throughout the year due to various reasons including further changes to the provisional repatriation tax, pretax earnings mix, tax reserves and revised interpretations of the relevant tax code.

BMS is currently under examination by a number of tax authorities, which have proposed or are considering proposing material adjustments to tax positions for issues such as transfer pricing, certain tax credits and the deductibility of certain expenses. It is reasonably possible that new issues will be raised by tax authorities, which may require adjustments to the amount of unrecognized tax benefits; however, an estimate of such adjustments cannot reasonably be made at this time.

It is also reasonably possible that the total amount of unrecognized tax benefits at June 30, 2018 could decrease in the range of approximately $350 million to $400 million in the next twelve months as a result of the settlement of certain tax audits and other events. The expected change in unrecognized tax benefits may result in the payment of additional taxes, adjustment of certain deferred taxes and/or recognition of tax benefits.

Note 10 . FINANCIAL INSTRUMENTS AND FAIR VALUE MEASUREMENTS

Financial assets and liabilities measured at fair value on a recurring basis are summarized below:

As further described in "-Note 9. Financial Instruments and Fair Value Measurements" in our 2017 Form 10-K, our fair value estimates use inputs that are either (1) quoted prices for identical assets or liabilities in active markets (Level 1 inputs); (2) observable prices for similar assets or liabilities in active markets or for identical or similar assets or liabilities in markets that are not active (Level 2 inputs); or (3) unobservable inputs (Level 3 inputs). There were no Level 3 financial assets or liabilities as of June 30, 2018 and December 31, 2017 .

Available-for-sale Securities

The following table summarizes available-for-sale securities:

Equity investments not measured at fair value and excluded from the above table were limited partnerships and other equity method investments of $95 million at June 30, 2018 and $66 million at December 31, 2017 and other equity investments without readily determinable fair values of $183 million at June 30, 2018 and $152 million at December 31, 2017 . These amounts are included in Other assets. Adjustments to equity investments without readily determinable fair values for the three and six months ended June 30, 2018 were $18 million resulting from observable price changes for similar securities of the same issuer and were recorded in Other income (net).

The following table summarizes net loss recorded for equity investments with readily determinable fair values held as of June 30, 2018 :