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SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 6-K

REPORT OF FOREIGN PRIVATE ISSUER

PURSUANT TO RULE 13A-16 OR 15D-16 OF THE

SECURITIES EXCHANGE ACT OF 1934

For the month of May 2018

FRESENIUS MEDICAL CARE AG & Co. KGaA

(Translation of registrant's name into English)

Else-Kröner Strasse 1

61346 Bad Homburg

Germany

(Address of principal executive offices)

           Indicate by check mark whether the registrant files or will file annual reports under cover of Form 20-F or Form 40-F.

              Form 20-F ý                   Form 40-F o

           Indicate by check mark if the registrant is submitting the Form 6-K in paper as permitted by Regulation S-T Rule 101(b)(1):           

           Indicate by check mark if the registrant is submitting the Form 6-K in paper as permitted by Regulation S-T Rule 101(b)(7):           

           Indicate by check mark whether the registrant by furnishing the information contained in this Form is also thereby furnishing the information to the Commission pursuant to Rule 12g3-2(b) under the Securities Exchange Act of 1934.

              Yes  o                               No  ý

           If "Yes" is marked, indicate below the file number assigned to the registrant in connection with Rule 12g3-2(b): 82 –            .

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FRESENIUS MEDICAL CARE AG & Co. KGaA

Interim Report of Financial Condition and Results of Operations for the three months ended March 31, 2018 and 2017

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FINANCIAL INFORMATION

Management's discussion and analysis

You should read the following discussion and analysis of the results of operations of Fresenius Medical Care AG & Co. KGaA ("FMC-AG & Co. KGaA," or the "Company") and its subsidiaries in conjunction with our unaudited consolidated financial statements and related notes contained elsewhere in this report and our disclosures and discussions in our consolidated financial statements for the year ended December 31, 2017 prepared in accordance with International Financial Reporting Standards ("IFRS") as issued by the International Accounting Standards Board ("IASB"), using the euro as our reporting currency. At March 31, 2018, there were no IFRS or International Financial Reporting Interpretation Committee ("IFRIC") interpretations as endorsed by the European Union relevant for internal reporting that differed from IFRS as issued by the IASB.

In this report, "FMC-AG & Co. KGaA," or the "Company," "we," "us" or "our" refers to the Company or the Company and its subsidiaries on a consolidated basis, as the context requires. The term "North America Segment" refers to our North America operating segment, the term "EMEA Segment" refers to the Europe, Middle East and Africa operating segment, the term "Asia-Pacific Segment" refers to our Asia-Pacific operating segment, and the term "Latin America Segment" refers to our Latin America operating segment. The term "Corporate" includes certain headquarters' overhead charges, including accounting and finance, centrally managed production, asset management, quality management, procurement and research and development. The abbreviation "M" is used to denote the presentation of amounts in millions. The term "Constant Currency" or at "Constant Exchange Rates" means that we have translated local currency revenue, operating income, net income attributable to shareholders of FMC-AG & Co. KGaA and other items for the current reporting period into euro using the prior year exchange rates to ensure a comparable analysis without effect from exchange rate fluctuations on translation, as described below under "Financial condition and results of operations – II. Discussion of measures – Non-IFRS measures – Constant currency information."

Forward-looking statements

This report contains forward-looking statements within the meaning of Section 27A of the Securities Act of 1933, as amended, and Section 21E of the Securities Exchange Act of 1934, as amended (the "Exchange Act"). When used in this report, the words "outlook," "expects," "anticipates," "intends," "plans," "believes," "seeks," "estimates" and similar expressions are generally intended to identify forward looking statements. Although we believe that the expectations reflected in such forward-looking statements are reasonable, forward-looking statements are inherently subject to risks and uncertainties, many of which cannot be predicted with accuracy and some of which might not even be anticipated, and future events and actual results, financial and otherwise, could differ materially from those set forth in or contemplated by the forward-looking statements contained elsewhere in this report. We have based these forward-looking statements on current estimates and assumptions made to the best of our knowledge. By their nature, such forward-looking statements involve risks, uncertainties, assumptions and other factors which could cause actual results, including our financial condition and profitability, to differ materially, positively or negatively, relative to the results expressly or implicitly described in or suggested by these statements. Moreover, forward-looking estimates or predictions derived from third parties' studies or information may prove to be inaccurate. Consequently, we cannot give any assurance regarding the future accuracy of the opinions set forth in this report or the actual occurrence of the projected developments described herein. In addition, even if our future results meet the expectations expressed here, those results may not be indicative of our performance in future periods.

These risks, uncertainties, assumptions, and other factors, including associated costs, could cause actual results to differ from our projected results and include, among others, the following:

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changes in governmental and commercial insurer reimbursement for our complete products and services portfolio, including the United States ("U.S.") Medicare reimbursement system for dialysis and other health care services, including potentially significant changes that could be enacted due to the announced intention of the Trump administration to continue its efforts to repeal and replace the Patient Protection and Affordable Care Act;



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the outcome of government and internal investigations as well as litigation;

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risks relating to compliance with current and future government regulations applicable to our business including, in the U.S., the Anti-Kickback Statute, the False Claims Act, the Stark Law, the Health Insurance Portability and Accountability Act, the Health Information Technology for Economic and Clinical Health Act, the Foreign Corrupt Practices Act, the Food, Drug and Cosmetic Act, and outside the U.S., the EU Medical Device Directive, the EU General Data Protection Regulation, the two invoice policy and the Tendering and Bidding Law in China and other related local legislation as well as other comparable regulatory regimes in many of the countries where we supply health care services and/or products;



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the influence of commercial insurers and integrated care organizations, including efforts by these organizations to manage costs by limiting healthcare benefits, reducing provider reimbursement and/or restricting options for patient funding of health insurance premiums;



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the impact of health care, tax and trade law reforms and regulation, including those proposed and enacted by the Trump administration in the U.S.;



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product liability risks;



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risks relating to our ability to continue to make acquisitions;



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risks relating to our ability to attract and retain skilled employees, including shortages of skilled clinical personnel;



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the impact of currency fluctuations;



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potential impairment loss on assets in the Latin America Segment due to decreases in the recoverable amount of those assets relative to their book value;



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our ability to protect our information technology systems against cyber security attacks or prevent other data privacy or security breaches;



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changes in our costs of purchasing and utilization patterns for pharmaceuticals;



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introduction of generic or new pharmaceuticals that compete with our products or services or the development of pharmaceuticals that greatly reduce the progression of chronic kidney disease;



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launch of new technology that competes with our medical equipment and device businesses;



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changes in raw material and energy costs or the inability to procure raw materials;



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collectability of our receivables, which depends primarily on the efficacy of our billing practices and the financial stability and liquidity of our governmental and commercial payors;



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our ability to achieve cost savings in various health care risk management programs in which we participate or intend to participate; and



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the greater size, market power, experience and product offerings of certain competitors in certain geographic regions and business lines.

Important factors that could contribute to such differences are noted in "Financial condition and results of operations – I. Overview" below, in note 11 of the notes to consolidated financial statements (unaudited) included in this report, in note 22 of the notes to consolidated financial statements included in our Annual Report on Form 20-F for the year ended December 31, 2017, as well as under "Risk Factors," "Business overview," "Operating and financial review and prospects," and elsewhere in that report.

Our business is also subject to other risks and uncertainties that we describe from time to time in our public filings. Developments in any of these areas could cause our results to differ materially from the results that we or others have projected or may project.

Our reported financial condition and results of operations are sensitive to accounting methods, assumptions and estimates that are the basis of our financial statements. The actual accounting policies, the judgments made in the selection and application of these policies as well as the sensitivities of reported results to changes in accounting policies, assumptions and estimates are factors to be considered along with our financial statements and the discussion under "Results of operations, financial position and net assets" below.

As a result of the implementation of IFRS 15 – Revenue from Contracts with Customers ("IFRS 15") and IFRS 9 – Financial Instruments ("IFRS 9"), the Company has updated its accounting policies accordingly. Please

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refer to note 1 of the notes to consolidated financial statements (unaudited) included in this report for further details on the updated policies. Excluding the policy updates for IFRS 15 and IFRS 9, there have been no significant changes during the three months ended March 31, 2018 to the items disclosed within the critical accounting policies and estimates in notes 1 and 2 to the consolidated financial statements in our annual report on Form 20-F for the year ended December 31, 2017 in accordance with IFRS as issued by the IASB.

Rounding adjustments applied to individual numbers and percentages shown in this and other reports may result in these figures differing immaterially from their absolute values.

Financial condition and results of operations

I. Overview

We are the world's largest kidney dialysis company, based on publicly reported sales and number of patients treated. We provide dialysis care and related services to persons who suffer from end stage renal disease ("ESRD") as well as other health care services. We develop and manufacture a wide variety of health care products, which includes both dialysis and non-dialysis products. Our dialysis products include dialysis machines, water treatment systems and disposable products while our non-dialysis products include acute cardiopulmonary and apheresis products. We sell our health care products to customers in around 150 countries and we also use them in our own health care service operations. Our dialysis business is therefore vertically integrated. We describe certain other health care services that we provide in our North America Segment and our Asia-Pacific Segment as "Care Coordination." Care Coordination currently includes, but is not limited to, coordinated delivery of pharmacy services, vascular, cardiovascular and endovascular specialty services as well as ambulatory surgery center services, physician nephrology and cardiology services, health plan services, urgent care services and ambulant treatment services. Care Coordination also includes the coordinated delivery of emergency, intensivist and hospitalist physician services as well as transitional care which we refer to as "hospital related physician services." All of these Care Coordination services together with dialysis care and related services represent our health care services. We estimated the volume of the global dialysis market was approximately €70 billion in 2017. Due to the complexity and evolving nature of Care Coordination services, we are currently unable to estimate the global volume of this market. Dialysis patient growth results from factors such as the aging population and increased life expectancies; shortage of donor organs for kidney transplants; increasing incidence of kidney disease and better treatment of and survival of patients with diabetes, hypertension and other illnesses, which frequently lead to the onset of chronic kidney disease; improvements in treatment quality, new pharmaceuticals and product technologies, which prolong patient life; and improving standards of living in developing countries, which make life-saving dialysis treatment available. We are also engaged in different areas of health care research.

As a global company delivering health care services and products, we face the challenge of addressing the needs of a wide variety of stakeholders, such as patients, customers, payors, regulators and legislators in many different economic environments and health care systems. In general, government-funded programs (in some countries in coordination with private insurers) pay for certain health care items and services provided to their citizens. Not all health care systems provide for dialysis treatment. Therefore, the reimbursement systems and ancillary services utilization environment in various countries significantly influence our business.

Premium assistance programs

On August 18, 2016, the Centers for Medicare and Medicaid Services ("CMS") issued a request for information ("RFI") seeking public comment on concerns about providers' steering patients inappropriately to individual plans offered on the Patient Protection and Affordable Care Act individual health insurance market. Fresenius Medical Care Holdings, Inc. ("FMCH") and other dialysis providers, commercial insurers and other industry participants responded to the RFI, and in that response, we reported that we do not engage in such steering. On December 14, 2016, CMS published an Interim Final Rule ("IFR") titled "Medicare Program; Conditions for Coverage for End-Stage Renal Disease Facilities-Third Party Payment" that would amend the Conditions for Coverage for dialysis providers, like FMCH. The IFR would have effectively enabled insurers to reject premium payments made by patients who received grants for individual market coverage from the American Kidney Fund ("AKF") and, therefore, could have resulted in those patients losing their individual market health insurance coverage. The loss of individual market coverage for these patients would have had a material and adverse impact on our operating results. On January 25, 2017, a federal district court in Texas, responsible for litigation initiated by a patient advocacy group and dialysis providers

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including FMCH, preliminarily enjoined CMS from implementing the IFR ( Dialysis Patient Citizens v. Burwell (E.D. Texas, Sherman Div.) ). The preliminary injunction was based on CMS' failure to follow appropriate notice-and-comment procedures in adopting the IFR. The injunction remains in place and the court retains jurisdiction over the dispute. On June 22, 2017, CMS requested a stay of proceedings in the litigation pending further rulemaking concerning the IFR. CMS stated, in support of its request that it expects to publish a Notice of Proposed Rulemaking in the Federal Register and otherwise pursue a notice-and-comment process in the fall of 2017 which has not been published to date. Plaintiffs in the litigation, including FMCH, consented to the stay, which was granted by the court.

The operation of charitable assistance programs like that of the AKF is also receiving increased attention by state insurance regulators. The result may be a regulatory framework that differs from state to state. Even in the absence of the IFR or similar administrative actions, insurers are likely to continue efforts to thwart charitable premium assistance to our patients for individual market plans and other insurance coverages. If successful, these efforts would have a material adverse impact on our operating results.

On January 3, 2017, FMCH received a subpoena from the United States Attorney for the District of Massachusetts inquiring into our interactions and relationships with AKF, including our charitable contributions to the Fund and the Fund's financial assistance to patients for insurance premiums. FMCH is cooperating with the investigation.

Ballot Initiatives

Further federal or state legislation or regulations may be enacted in the future that could substantially modify or reduce the amounts paid for services and products offered by us and our subsidiaries and/or implement new or alternative payment models for dialysis that could present more risk sharing for dialysis clinics. Ballot initiatives introduced at the state level which could further regulate clinic staffing requirements, state inspection requirements and commercial reimbursement rates. State regulation at this level would introduce an unprecedented level of oversight and additional expense at the clinic level which could have a material adverse effect on our business in the impacted states. While there is uncertainty regarding the passage and scope of these ballot initiatives, if some form of ballot initiative passes at the state level, such action could have a material adverse impact on our business. It is also possible that statutes may be adopted or regulations may be promulgated in the future that impose additional eligibility requirements for participation in the federal and state healthcare programs. Such new legislation or regulations could, depending upon the detail of the provisions, have positive or adverse effects, possibly material, on our businesses and results of operations.

Significant U.S. reimbursement developments

The majority of health care services we provide are paid for by governmental institutions. For the three months ended March 31, 2018, approximately 32% of our consolidated revenue is attributable to U.S. federally-funded health care benefit programs, such as Medicare and Medicaid reimbursement, under which reimbursement rates are set by CMS. Legislative changes could affect Medicare reimbursement rates for a significant portion of the services we provide. To date, while we have generally experienced stable reimbursement globally, the stability of reimbursement in the U.S. has been affected by (i) the implementation of the ESRD prospective payment system ("ESRD PPS") in January 2011, (ii) the U.S. federal government across the board spending cuts in payments to Medicare providers commonly referred to as "U.S. Sequestration," (iii) the reduction to the ESRD PPS rate to account for the decline in utilization of certain drugs and biologicals associated with dialysis pursuant to the American Taxpayer Relief Act of 2012 ("ATRA") as subsequently modified under the Protecting Access to Medicare Act of 2014 ("PAMA") and (iv) CMS's 2017 final rule on the Physician Fee Schedule, which partially corrected reimbursement for certain procedures that were materially undervalued in 2016. Please see the detailed discussions on these and further legislative developments below:

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Under the Medicare Improvements for Patients and Providers Act of 2008 ("MIPPA"), for patients with Medicare coverage, all ESRD payments for dialysis treatments are made under a single bundled payment rate which provides a fixed payment rate, the ESRD PPS, to encompass substantially all goods and services provided during the dialysis treatment. MIPPA further created the ESRD quality incentive program ("QIP") which provides that dialysis facilities that fail to achieve quality standards established by CMS could have payments reduced, determined on an annual basis, by up to 2 percent.

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MIPPA also includes a provision for an annual adjustment to the ESRD PPS base rate based on changes in the costs of a "market basket" of certain healthcare items and services, less a productivity adjustment.

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Additionally, as a result of the Budget Control Act of 2011 ("BCA") and subsequent activity in Congress, U.S. Sequestration ($1.2 trillion in across-the-board spending cuts in discretionary programs) took effect on March 1, 2013 and is expected to continue through mid-2024. In particular, a 2% reduction to Medicare payments took effect on April 1, 2013 and continues in force. Spending cuts pursuant to U.S. Sequestration have adversely affected and will continue to adversely affect our operating results.

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In 2014, as mandated by ATRA, CMS issued a final rule for the ESRD PPS, which phased in payment reductions to account for changes in utilization of certain drugs and biologicals that are included in the ESRD PPS, which were subsequently modified by PAMA. These reductions reduced our market basket inflation adjustment by 1.25% in 2016 and 2017, and will reduce our inflation adjustment by 1% in 2018.

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On November 15, 2017, CMS published a final rule that modifies certain payment policies, payment rates, and quality provisions in the Physician Fee Schedule for calendar year 2018. In the final rule CMS partially restored dialysis circuit services procedure codes reimbursement rates that were significantly reduced in the previous year. Payment increases ranged from 1.1% to 5.2% across the family of codes. The increased payments are a modest correction following a restructuring of these codes in 2017 that led to material decreases in the reimbursement rates for these procedures, which are performed routinely by Fresenius Vascular Care, now known as "Azura Vascular Care."

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On October 27, 2017, CMS issued the final rule and updated the ESRD PPS rate for 2018. We and other large dialysis organizations will experience a 0.4% increase in payments under this final rule. The base rate per treatment is $232.37 which represents a 0.3% increase from the 2017 base rate including the adjustment for the wage index budget-neutrality factor. The 2018 final rule reflects a market basket increase of 0.3% (1.9% market basket increase that is partially offset by a 1% reduction under PAMA and a 0.6% multifactor productivity adjustment) and application of the wage index budget-neutrality adjustment factor of 1.000531. The 2018 ESRD PPS rate does not contain any changes to the previous wage index floor of 0.4000.

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The ESRD PPS final rule also updated the ESRD QIP, including for payment years 2019, 2020, and 2021, under which payment incentives are made to dialysis facilities to improve the quality of care that they provide. The final rule includes updates to the ESRD QIP Extraordinary Circumstances Exception Policy, Performance Score Certificate, National Healthcare Safety Network dialysis event data validation sampling methodology, and quality measures. The final rule also updated the payment for dialysis provided to patients with acute kidney injuries to be equal to the 2018 ESRD PPS base rate.

Presently, there is considerable uncertainty regarding possible future changes in health care regulation, including the regulation of reimbursement for dialysis services. See "Risk factors – We operate in a highly regulated industry such that the potential for legislative reform provides uncertainty and potential threats to our operating models and results" which is included in our Annual Report on Form 20-F for the year ended December 31, 2017.

In a final rule published on November 6, 2015, CMS provided for implementation of the PAMA oral-only provision. CMS clarified that once any non-oral ESRD-related drug in a category previously considered oral only is approved by the U.S. Food and Drug Administration ("FDA"), such category of drugs will cease to be considered oral only. However, for at least two years, CMS will pay for both oral and non-oral versions of the drug using a "transitional drug add-on payment adjustment," based on the average sales price plus 6% (4.3% after giving effect to the U.S. Sequestration) or some other mechanism set in accordance with Section 1847A of the Social Security Act. During this transition period, CMS will not pay outlier payments for these drugs, but the agency will collect data reflecting utilization of both the oral and injectable or intravenous forms of the drugs, as well as payment patterns, in order to help determine how to appropriately adjust the ESRD PPS payment rate as these drugs are included in the payment bundle. At the end of this transition period, CMS will incorporate payment for the oral and non-oral versions of the drug in the ESRD PPS payment rates, utilizing a public rulemaking process.

On February 7, 2017, Amgen, Inc. announced that the FDA had approved Parsabiv™, an intravenous calcimimetic for the treatment of secondary hyperparathyroidism in adult patients with chronic kidney disease on dialysis. Effective January 1, 2018, CMS implemented the transitional drug add-on payment adjustment and applied it to calcimimetics. CMS adjusted the ESRD PPS rate to reflect the addition of the calcimimetics to the ESRD PPS payment bundle. As a result, we expect lower utilization of and revenue from calcimimetics in our U.S. dialysis business as compared to historical levels ("PAMA oral-only provision"). Under PAMA, CMS will collect and review intravenous and oral

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calcimimetics utilization data and payment patterns during the transition period and adjust the ESRD PPS payment rate at the end of the transition period based on CMS's findings.

The introduction of Parsabiv also impacts how some payors, other than Medicare, arrange for the provision of calcimimetics for their patients. While some patients continue to receive calcimimetics from their pharmacies as a pharmacy benefit, other patients receive calcimimetics from their dialysis providers as a medical benefit. While we anticipate receiving additional reimbursement from payors when these drugs are provided by our clinics, this type of transition from an oral-only drug has not occurred previously and the reimbursement landscape for non-Medicare payors is still being developed.

If we are unable to secure appropriate reimbursement arrangements for calcimimetics when provided by our dialysis clinics, we could experience a material adverse effect on our business, results of operations and financial condition.

Participation in new Medicare payment arrangements

Under CMS's Comprehensive ESRD Care Model (the "Model"), dialysis providers and physicians can form entities known as ESRD Seamless Care Organizations, or "ESCOs," as part of a new payment and care delivery model that seeks to deliver better health outcomes for ESRD patients while lowering CMS' costs. We are presently participating in the Model through 24 ESCOs formed at our dialysis facilities. ESCOs that achieve the program's minimum quality thresholds and generate reductions in CMS' cost of care above certain thresholds for the ESRD patients covered by the ESCO will receive a share of the cost savings, which is adjusted based on the ESCO's performance on certain quality metrics. ESCOs that include dialysis chains with more than 200 facilities are required to share in the risk of cost increases and to reimburse CMS a share of any such increases if actual costs rise above set thresholds. As of January 1, 2018, the existing twenty-four ESCOs expanded by adding new physician practice partners and dialysis facilities, growing the number of patients participating from approximately 26,000 in 2017 to 41,000 in 2018.

In November 2017, we announced the results from the first performance year from our ESCOs. The results, which cover the period from October 2015 through December 2016, show improved health outcomes for patients receiving care coordination through the ESCOs. This success was validated by an independent report, which showed a nearly nine percent decrease in hospitalization rates for these patients during the same time. As a result, the Company's ESCOs together generated more than $43 M in gross savings, an average 5.47% reduction in expenditures per patient, with all six of its first-year ESCOs exceeding the shared savings benchmark.

Bundled Payment for Care Improvement ("BPCI") is a CMS pilot initiative, extended through September 30, 2018, with bundled payments for the individual services furnished to Medicare beneficiaries during a single episode of illness or course of treatment, including acute inpatient hospital services, physician services, and post-acute services. Our majority-owned subsidiary, Sound Inpatient Physicians, Inc. ("Sound"), commenced participation under BPCI in April 2015 in several markets. Under the BPCI, we have the ability to receive additional payments if we are able to deliver quality care at a cost that is lower than certain established benchmarks, but also have the risk of incurring financial penalties if we are unsuccessful in doing so. Should Sound fail to perform as required under its BCPI agreement, CMS may terminate Sound's participation in the BPCI program, in whole or in part. On April 20, 2018, we entered into a definitive agreement to divest our controlling interest in Sound. See note 15 of the notes to consolidated financial statements (unaudited) included in this report. We will continue to monitor certain of our businesses' potential participation in existing and future CMS programs.

On January 9, 2018, CMS announced the launch of a new bundled payment model named Bundled Payments for Care Improvement Advanced ("BPCI Advanced"). Under BPCI Advanced, participants can earn additional payment if expenditures for a beneficiary's episode of care do not exceed spending targets which includes measures for quality. BPCI Advanced qualifies as an Advanced Alternative Payment Model ("Advanced APM") under the Quality Payment Program as required by the Medicare and CHIP Reauthorization Act of 2015 ("MACRA"). Under Advanced APMs, providers take on financial risk to earn the Advanced APM incentive payment. The model performance period for BPCI Advanced starts on October 1, 2018 and continues to December 31, 2023. Similar to the current BPCI model, a formal, independent evaluation will be performed to assess the quality of care and changes in spending under BPCI Advanced. We plan to participate in BPCI Advanced in the future.

We are providing Medicare Advantage ESRD Chronic Conditions Special Needs Plan ("MA-CSNP") products in five states since January 1, 2017. MA-CSNPs are Medicare health plans offered by private companies that contract with

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Medicare to provide Medicare benefits to special needs individuals with specific severe or disabling chronic conditions such as ESRD, with a focus on improving the coordination of care. As a MA-CSNP, we will provide health care services and receive set payments from CMS for the complete care of ESRD patients who have enrolled in our MA-CSNP. For each MA-CSNP, we manage medical costs through underwriting criteria, product design, negotiation of favorable provider contracts and care management programs. Total medical costs are affected by the number and type of individual services rendered as well as the cost of each service. Our revenue on Medicare Advantage policies is based on CMS' premiums set for ESRD beneficiaries, based on the average cost of similar beneficiaries in the Medicare program. The benefits, and projected medical costs, of these plans are submitted to CMS in June the year before the contract year ("Bid"). MA-CSNPs were set to expire on January 1, 2019, but the authorization of these plans was permanently extended as part of Section 50311 of the Bipartisan Budget Act of 2018. Although we base the premiums we charge and our Bids on our estimates of future medical costs over the fixed contract period, many factors may cause actual costs to exceed those estimated and reflected in premiums or Bids. Failure to adequately price our products or estimate the costs of providing benefits to our beneficiaries, or effectively manage our operating expenses, may result in a material adverse impact on our business, financial condition and results of operations.

We have also entered into sub-capitation and other risk-based and value-based arrangements with certain payors to provide care to Medicare Advantage ESRD patients. Under these arrangements, a baseline per patient per month amount is established. If we provide complete care for less than the baseline, we retain the difference. If the cost of complete care exceeds the baseline, we owe the payor the difference.

Company structure

Our operating segments are the North America Segment, the EMEA Segment, the Asia-Pacific Segment and the Latin America Segment. The operating segments are determined based upon how we manage our businesses with geographical responsibilities. All segments are primarily engaged in providing health care services and the distribution of products and equipment for the treatment of ESRD and other extracorporeal therapies. Management evaluates each segment using measures that reflect all of the segment's controllable revenues and expenses. With respect to the performance of business operations, management believes that the most appropriate IFRS measures are revenue, operating income and operating income margin. We do not include income taxes as we believe this is outside the segments' control. Financing is a corporate function which our segments do not control. Therefore, we do not include interest expense relating to financing as a segment measurement. Similarly, we do not allocate certain costs which relate primarily to certain headquarters' overhead charges, including accounting and finance, because we believe that these costs are also not within the control of the individual segments. Production of products, production asset management, quality management and procurement related to production are centrally managed at Corporate. Global research and development is also centrally managed at Corporate. These corporate activities do not fulfill the definition of a segment according to IFRS 8. Products are transferred to the segments at cost; therefore no internal profit is generated. The associated internal revenue for the product transfers and their elimination are recorded as corporate activities (See note 13 of the notes to consolidated financial statements (unaudited) found elsewhere in this report). Capital expenditures for production are based on the expected demand of the segments and consolidated profitability considerations. In addition, certain revenues, investments and intangible assets, as well as any related expenses, are not allocated to a segment but accounted for as Corporate. Accordingly, all of these items are excluded from our analysis of segment results and are discussed below in the discussion of our consolidated results of operations.

II. Discussion of measures

Non-IFRS measures

Certain of the following key performance indicators and other financial information as well as discussions and analyses set out in this report include measures that are not defined by IFRS ("Non-IFRS Measure"). We believe this information, along with comparable IFRS measurements, is useful to our investors as it provides a basis for assessing our performance, payment obligations related to performance-based compensation as well as our compliance with financial covenants. Non-IFRS financial measures should not be viewed or interpreted as a substitute for financial information presented in accordance with IFRS.

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Delivered EBIT (Non-IFRS Measure)

As a result of the significance of noncontrolling interest holders in our operations, we believe a measure that is meaningful to investors is operating income less noncontrolling interests ("Delivered EBIT"). Delivered EBIT approximates the operating income attributable to the shareholders of FMC-AG & Co. KGaA. As such, we believe that operating income, or EBIT, is the closest comparable IFRS measure.

Below is a table showing the reconciliation of operating income to Delivered EBIT on a consolidated basis and for our reporting segments:

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Net cash provided by (used in) operating activities in % of revenue (Non-IFRS Measure)

Our consolidated statement of cash flows indicates how we generated and used cash and cash equivalents. In conjunction with our other primary financial statements, it provides information that helps us evaluate changes to our net assets and our financial structure (including liquidity and solvency). Net cash provided by (used in) operating activities is applied to assess whether a business can generate the cash required to make the necessary replacement and expansion of investments. This indicator is impacted by the profitability of our business and the development of working capital, mainly receivables. Net cash provided by (used in) operating activities in percent of revenue shows the percentage of our revenue that is available in terms of financial resources. It is an indicator of our operating financial strength.

Free cash flow in % of revenue (Non-IFRS Measure)

Free cash flow (net cash provided by (used in) operating activities after capital expenditures, before acquisitions and investments) refers to the cash flow we have at our disposal. This indicator shows the percentage of revenue available for acquisitions and investments, dividends to shareholders, reducing debt financing or for repurchasing shares.

The following table shows the significant cash flow key performance indicators for the three months ended 2018 and 2017 and reconciles free cash flow and free cash flow in percent of revenue to Net cash provided by (used in) operating activities and Net cash provided by (used in) operating activities in percent of revenue, respectively:

Net leverage ratio (Non-IFRS Measure)

The Net Leverage Ratio is a key performance indicator used for internal management. To determine the Net Leverage Ratio, debt less cash and cash equivalents (net debt) is compared to EBITDA (earnings before interest, taxes, depreciation and amortization) (adjusted for acquisitions and divestitures made for the last twelve months with a purchase price above a €50 M threshold as defined in our Amended 2012 Credit Agreement and non-cash charges). The ratio is an indicator of the length of time the Company needs to service the net debt out of its own resources. We believe that the Net Leverage Ratio provides more reliable information about the extent to which we are able to meet our payment obligations rather than considering only the absolute amount of our debt. We have a strong market position in a growing, global and mainly non-cyclical market. Furthermore, most of our customers have a high credit rating as the dialysis industry is characterized by stable and sustained cash flows. We believe this

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enables us to work with a relatively large share of debt capital compared with companies in other industries. The following table shows the reconciliation of Net Leverage Ratio as of March 31, 2018 and December 31, 2017.

Return on invested capital ("ROIC")(Non-IFRS Measure)

ROIC is the ratio of operating income, for the last twelve months, after tax ("net operating profit after tax" or "NOPAT") to the average invested capital of the last five quarter closing dates and expresses how efficiently we allocate the capital under our control or how well we employ our capital with regard to a specific investment project.

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The following table shows the reconciliation of average invested capital to total assets, which we believe to be the most directly comparable IFRS financial measure, and how ROIC is calculated:

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