Filed Pursuant to Rule 424(b)(5)

Registration No. 333-209889

CALCULATION OF REGISTRATION FEE

PROSPECTUS SUPPLEMENT

(to Prospectus dated August 6, 2018)

$1,500,000,000

INTERNATIONAL FLAVORS & FRAGRANCES INC.

$300,000,000 3.400% Senior Notes due 2020

$400,000,000 4.450% Senior Notes due 2028

$800,000,000 5.000% Senior Notes due 2048

We are offering $300,000,000 aggregate principal amount of 3.400% Senior Notes due 2020 (the “2020 notes”), $400,000,000 aggregate principal amount of 4.450% Senior Notes due 2028 (the “2028 notes”) and $800,000,000 aggregate principal amount of 5.000% Senior Notes due 2048 (the “2048 notes” and, together with the 2020 notes and the 2028 notes, the “notes”). The 2020 notes will bear interest at a rate of 3.400% per annum and will mature on September 25, 2020. The 2028 notes will bear interest at a rate of 4.450% per annum and will mature on September 26, 2028. The 2048 notes will bear interest at a rate of 5.000% per annum and will mature on September 26, 2048. Interest on the 2020 notes will accrue from September 26, 2018, and will be payable semi-annually in cash in arrears on March 25 and September 25 of each year, beginning on March 25, 2019. Interest on the 2028 notes and the 2048 notes will accrue from September 26, 2018, and will be payable semi-annually in cash in arrears on March 26 and September 26 of each year, beginning on March 26, 2019.

We may, at our option, redeem the notes in whole or in part at any time or from time to time prior to maturity at the redemption price described in the section “Description of the Notes—Optional Redemption” in this prospectus supplement. Upon an occurrence of a “Change of Control Triggering Event” (as defined herein), we will be required to make an offer to repurchase the notes at a price equal to 101% of their principal amount plus accrued and unpaid interest to, but not including, the date of repurchase.

On May 7, 2018, International Flavors & Fragrances Inc. (“IFF”) entered into an Agreement and Plan of Merger (the “Merger Agreement”) with Frutarom Industries Ltd., a company organized under the laws of the State of Israel (“Frutarom”), and Icon Newco Ltd., a company organized under the laws of the State of Israel and a wholly owned subsidiary of IFF (“Merger Sub”). Pursuant to the Merger Agreement, subject to the satisfaction or waiver of specified conditions, and in accordance with the Companies Law 5759-1999 of the State of Israel (together with the rules and regulations thereunder, the “ICL”), Merger Sub will merge with and into Frutarom (the “Merger”), with Frutarom continuing as the surviving company in the Merger and a wholly owned subsidiary of IFF.

This notes offering is not contingent on the completion of the Merger or any additional financing. However, if the closing of the Merger has not occurred on or prior to February 7, 2019, or, if prior to such date, the Merger Agreement is terminated, we will be required to redeem all of the notes on the Special Mandatory Redemption Date (as defined herein) at a redemption price equal to 101% of the aggregate principal amount of the notes, plus accrued and unpaid interest to, but not including, the Special Mandatory Redemption Date. See “Description of the Notes—Special Mandatory Redemption.”

The notes are our direct, unsecured and unsubordinated obligations and will rank equally with all of our other unsecured and unsubordinated indebtedness from time to time outstanding.

The notes will not be listed on any national securities exchange or quoted on any automated dealer quotation system. Currently there is no public market for the notes.

Investing in the notes involves significant risks. See “Risk Factors” in this prospectus supplement and the documents incorporated by reference in this prospectus supplement and the accompanying prospectus, including our Annual Report on Form 10-K for the year ended December 31, 2017.

Neither the Securities and Exchange Commission nor any state securities commission has approved or disapproved of these securities or determined if this prospectus supplement or the accompanying prospectus is truthful or complete. Any representation to the contrary is a criminal offense.

We expect that delivery of the notes will be made to investors through the book-entry facilities of The Depository Trust Company and its direct participants, including Euroclear Bank, S.A./N.V., as operator of the Euroclear System, and Clearstream Banking, société anonyme, against payment on or about September 26, 2018.

Joint Book-Running Managers

Co-Managers

The date of this prospectus supplement is September 24, 2018.

Unless we have indicated, or the context otherwise requires, references in this prospectus supplement to “IFF,” “the Company,” “we,” “us,” “our,” or similar terms are to International Flavors & Fragrances Inc. and its subsidiaries.

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ABOUT THIS PROSPECTUS SUPPLEMENT

We are providing information to you about this offering in two parts. The first part is this prospectus supplement, which provides the specific details regarding this offering. The second part is the accompanying prospectus, which provides general information. Generally, when we refer to this “prospectus,” we are referring to both documents combined. This prospectus supplement may add, update or change information contained in or incorporated by reference in the accompanying prospectus. Some of the information contained in or incorporated by reference in the accompanying prospectus may not apply to this offering. If the information in this prospectus supplement or the information incorporated by reference in this prospectus supplement is inconsistent with information contained in or incorporated by reference in the accompanying prospectus, you should rely on the information in this prospectus supplement or the information incorporated by reference in this prospectus supplement.

We are responsible for the information contained and incorporated by reference in this prospectus supplement, the accompanying prospectus and in any free writing prospectus with respect to this offering filed by us with the Securities and Exchange Commission (the “SEC”). We have not, and the underwriters have not, authorized anyone to give you any other information, and we take no responsibility for any other information that others may give you. This prospectus supplement, the accompanying prospectus and any such free writing prospectus may be used only for the purposes for which they have been prepared. We are not, and the underwriters are not, making an offer to sell these securities in any jurisdiction where the offer or sale is not permitted. You should not assume that the information contained in this prospectus supplement, the accompanying prospectus, any free writing prospectus and the documents incorporated by reference herein and therein is accurate as of any date other than their respective dates. Our business, financial condition, liquidity, results of operations and prospects may have changed since those dates.

The notes are being offered for sale only in jurisdictions where it is lawful to make such offers. The distribution of this prospectus supplement and the accompanying prospectus and the offering of the notes in certain jurisdictions may be restricted by law. Persons outside the United States who receive this prospectus supplement and the accompanying prospectus should inform themselves about and observe any such restrictions. This prospectus supplement and the accompanying prospectus do not constitute, and may not be used in connection with, an offer or solicitation by anyone in any jurisdiction in which such offer or solicitation is not authorized or in which the person making such offer or solicitation is not authorized or in which the person making such offer or solicitation is not qualified to do so or to any person to whom it is unlawful to make such offer or solicitation. See “Underwriting” in this prospectus supplement.

Unless we specifically state otherwise, the information in this prospectus supplement and the accompanying prospectus, including the documents incorporated by reference herein and therein, does not give effect to the Merger.

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RISK FACTORS

An investment in the notes involves significant risks. You should consult with your own financial and legal advisers and carefully consider, among other matters, the following risks and those described in our Annual Report on Form 10-K for the year ended December 31, 2017, our Quarterly Reports on Form 10-Q for the quarters ended March 31, 2018 and June 30, 2018, respectively, and the other documents incorporated herein by reference. You should carefully consider the risks described in those reports and the other information in this prospectus supplement and accompanying prospectus before you decide to invest in the notes. Such risks and uncertainties are not the only ones we face. Additional risks and uncertainties not presently known to us or that we currently deem immaterial may also affect us. If any of those risks were to occur, our financial condition, operating results and prospects, as well as the value of the notes, could be materially adversely affected.

Risks Related to Our Business

For a discussion of risks related to our business and operations, please see “Item 1A. Risk Factors” and “Item 7. Management’s Discussion and Analysis of Financial Condition and Results of Operations” in our Annual Report on Form 10-K for our fiscal year ended December 31, 2017, as well as similar disclosures contained in our other filings with the SEC that are incorporated by reference in this prospectus supplement and the accompanying prospectus. See “Incorporation of Certain Information by Reference.”

Risks Related to the Merger

If we are unable to complete the Merger, in a timely manner or at all, our business may be adversely affected.

Our and Frutarom’s obligations to consummate the Merger are subject to the satisfaction or waiver of the following customary conditions, including: (i) the approval of the Merger Agreement and the Merger by the shareholders of Frutarom, which was obtained on August 6, 2018; (ii) regulatory clearance under antitrust laws, which has been received; (iii) receipt of all governmental and stock exchange approvals necessary for the issuance and listing of shares of IFF common stock as contemplated by the Merger Agreement, (iv) the absence of any order, or the enactment of any law, prohibiting the Merger; (v) subject to certain exceptions, the accuracy of the representations and warranties of the parties and compliance by the parties with their respective obligations under the Merger Agreement; and (vi) the absence of any material adverse effect on Frutarom or our company since the date of the Merger Agreement. Furthermore, our ability to access the bridge financing facility is subject to customary conditions. As many of these conditions are outside of our control, we cannot assure you if the conditions to the completion of the Merger and the associated financings will be satisfied in a timely manner or at all which may affect when and whether the Merger will occur. Furthermore, if the Merger is not completed and the Merger Agreement is terminated, we may suffer other consequences that could adversely affect our business and results of operations, including the following:

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We may not realize the benefits anticipated from the Merger, which could adversely affect our business.

The Merger, if completed, will be our largest acquisition to date. The anticipated benefits from the Merger are, necessarily, based on projections and assumptions about the combined businesses of our company and Frutarom, which may not materialize as expected or which may prove to be inaccurate. Our ability to achieve the anticipated benefits will depend on our ability to successfully and efficiently integrate the business and operations of Frutarom with our business and achieve the expected synergies. We may encounter significant challenges with successfully integrating and recognizing the anticipated benefits of the potential Merger, including the following:

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In addition, our anticipated benefits of the transaction with Frutarom contemplate significant cost-saving synergies. Consequently, even if we are able to successfully integrate the operations of Frutarom with ours, we may not realize the full benefits of the transactions if we are unable to identify and implement the anticipated cost savings or if the actions taken to implement such cost-savings have unintended consequences on our other business operations.

If we do not successfully manage these issues and the other challenges inherent in integrating an acquired business of the scale of Frutarom, then we may not achieve the anticipated benefits of the Merger, we could incur unanticipated expenses and charges and our operating results could be materially and adversely affected.

Uncertainty about the Merger may adversely affect our relationships with customers and employees, which could negatively affect our business, whether or not the Merger is completed.

The announcement of the Merger on May 7, 2018, whether or not completed, may cause uncertainties in our relationships with our customers which could impair our ability to or expand our historical customer sales growth. Furthermore, uncertainties about the Merger may cause our current and prospective employees to experience uncertainty about their future with us. These uncertainties may impair our ability to retain, recruit or motivate key employees which could affect our business.

The Merger may result in significant charges or other liabilities that could adversely affect the financial results of the combined company.

The financial results of the combined company, following IFF’s acquisition of Frutarom, may be adversely affected by cash expenses and non-cash accounting charges incurred in connection with our integration of the business and operations of Frutarom. Furthermore, as a result of the transaction we will record a significant amount of goodwill and other intangible assets on our consolidated financial statements, which could be subject to impairment based upon future adverse changes in our business or prospects including our inability to recognize the benefits anticipated by the transaction.

In addition, upon the acquisition of Frutarom we will assume all their liabilities, including unknown and contingent liabilities that Frutarom assumed in connection with their acquisitions, that we failed or were unable to identify in the course of performing due diligence. Frutarom has completed 47 acquisitions since 2011, including 22 since the beginning of 2016. Our ability to accurately identify and assess the magnitude of the liabilities assumed by Frutarom in these acquisitions may be limited by, among other things, the information available to us and Frutarom and the limited operating experience that Frutarom has with these acquired entities. Furthermore, Frutarom has additional future obligations regarding certain of these acquisitions including outstanding earn-out obligations and put options requiring Frutarom to purchase additional shares in the target company, which we will assume upon consummation of the transaction. If we are not able to completely assess the scope of these liabilities or if these liabilities are neither probable nor estimable at this time, our future financial results could be adversely affected by unanticipated reserves or charges, unexpected litigation or regulatory exposure, unfavorable accounting charges, unexpected increases in taxes due, a loss of anticipated tax benefits or other adverse effects on our business, operating results or financial condition.

The regulatory approvals required in connection with the Merger may not be obtained or may contain materially burdensome conditions.

Completion of the Merger is conditioned upon the receipt of certain regulatory approvals, and we cannot provide assurance that these approvals will be obtained. If any conditions or changes to the proposed structure of the Merger are required to obtain these regulatory approvals, they may have the effect of jeopardizing or delaying completion of the Merger or reducing the anticipated benefits of the Merger. If we agree to any material conditions in order to obtain any approvals required to complete the Merger, the business and results of operations of the combined company may be adversely affected.

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The use of cash and incurrence of significant indebtedness in connection with the financing of the Merger may have an adverse impact on our liquidity, limit our flexibility in responding to other business opportunities and increase our vulnerability to adverse economic and industry conditions.

The Merger will be financed in part by the use of our cash on hand, the incurrence of a significant amount of indebtedness and issuances of equity. As of June 30, 2018, we had approximately $322.4 million of cash and cash equivalents and approximately $1,723.7 million of total debt outstanding. In connection with the Merger, we expect to incur significant new debt. The proceeds from the new debt are expected to be used to pay part of the purchase price, refinance existing debt of both our company and Frutarom and pay transaction related fees and expenses. If we are unable to raise financing on acceptable terms, we may need to rely on our bridge loan facility, which may result in higher borrowing costs and a shorter maturity than those from other anticipated financing alternatives. The use of cash on hand and indebtedness to finance the Merger will reduce our liquidity and could cause us to place more reliance on cash generated from operations to pay principal and interest on our debt, thereby reducing the availability of our cash flow for working capital, dividend and capital expenditure needs or to pursue other potential strategic plans. The increased indebtedness may also have the effect, among other things, of limiting our ability to obtain additional financing, if needed, limiting our flexibility in the conduct of our business and making us more vulnerable to economic downturns and adverse competitive and industry conditions.

Risks Related to the Notes

The notes will be subject to the prior claims of any secured creditors, and if a default occurs, we may not have sufficient funds to fulfill our obligations under the notes.

The notes are unsecured obligations, ranking equally with our other senior unsecured indebtedness and effectively junior to any secured indebtedness we may incur. If we incur secured debt, our assets securing any such indebtedness will be subject to prior claims by our secured creditors. In the event of the bankruptcy, insolvency, liquidation, reorganization, dissolution or other winding up of the Company, our assets that secure debt will be available to pay obligations on the notes only after all debt secured by those assets has been repaid in full. Holders of the notes will participate in any remaining assets ratably with all of our other unsecured and unsubordinated creditors, including trade creditors. If there are not sufficient assets remaining to pay all these creditors, then all or a portion of the notes then outstanding would remain unpaid.

The notes are structurally subordinated to the indebtedness and other liabilities of our subsidiaries.

The notes are our obligations exclusively and not of any of our subsidiaries. In the year ended December 31, 2017, International Flavors & Fragrances Inc. generated approximately 21% of our consolidated net sales and 14% of our consolidated gross profit (excluding intercompany sales) at the parent level, while our subsidiaries generated approximately 79% of our consolidated net sales and 86% of our consolidated gross profit. Our subsidiaries are separate legal entities that have no obligation to pay any amounts due under the notes or to make any funds available therefor, whether by dividends, loans or other payments. Except to the extent we are a creditor with recognized claims against our subsidiaries, all claims of creditors, including trade creditors of our subsidiaries, will have priority with respect to the assets of such subsidiaries over our claims (and therefore the claims of our creditors, including holders of the notes). Consequently, the notes will be structurally subordinated to all liabilities, including trade payables, of our subsidiaries and any subsidiaries that we may in the future acquire or establish. As of June 30, 2018, our subsidiaries had approximately $759.4 million of outstanding liabilities on an actual basis and $759.4 million of outstanding liabilities on an as adjusted basis, in each case including trade payables, but excluding intercompany liabilities and deferred gains.

In addition, the indenture governing the notes permits our subsidiaries to incur additional indebtedness, and does not contain any limitation on the amount of other liabilities, such as trade payables, that may be incurred by our subsidiaries.

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We may incur additional indebtedness.

As of June 30, 2018, we had $1,723.7 million of debt outstanding and we intend to issue a total of $3.2 billion of debt to finance the Merger, including the euro notes and the notes offered hereby. The indenture governing the notes does not prohibit us from incurring additional unsecured indebtedness in the future. We are also permitted to incur additional secured indebtedness that would be effectively senior to the notes subject to limitations described in the section “Description of the Notes—Certain Covenants” in this prospectus supplement. The indenture governing the notes also permits unlimited additional borrowings by our subsidiaries that are effectively senior to the notes. In addition, the indenture does not contain any restrictive covenants limiting our ability to pay dividends or make payments on junior or other indebtedness.

Our credit ratings may not reflect all risks of an investment in the notes.

The notes are expected to be rated by at least one nationally recognized statistical rating organization. The ratings of the notes may not reflect the potential impact of all risks related to structure and other factors on any trading market for, or trading value of, the notes. In addition, real or anticipated changes in our credit ratings will generally affect any trading market for, or trading value of, the notes. A credit rating is not a recommendation to buy, sell or hold securities and may be revised or withdrawn by the rating agency at any time. There is no assurance that a credit rating will remain for any given period of time or that a credit rating will not be lowered or withdrawn by the relevant rating agency if, in its judgment, circumstances so warrant. In the event that a credit rating assigned to the notes or to us is subsequently lowered for any reason, no person or entity is obliged to provide any additional support or credit enhancement with respect to the notes, and the market value of the notes is likely to be adversely affected.

There may be no trading market for the notes.

We do not intend to list the notes to be offered under this prospectus supplement on any securities exchange or to seek approval for quotations of the notes through any automated quotation system. There is no established market for the notes and there is a risk that:

If a public market for the notes does develop, the notes could trade at prices that may be lower than their principal amount or purchase price, depending on many factors, including prevailing interest rates, the market for similar notes and our financial performance and prospects.

An increase in market interest rates could result in a decrease in the value of the notes.

In general, as market interest rates rise, notes bearing interest at a fixed rate generally decline in value because the premium, if any, over market interest rates will decline. Consequently, if you purchase fixed rate notes and market interest rates increase, the market value of your fixed rate notes may decline. We cannot predict the future level of market interest rates.

The notes may not be a suitable investment for all investors.

You must determine the suitability of your investment in light of your own circumstances. In particular, you should (1) have sufficient knowledge and experience to make a meaningful evaluation of the notes, the merits and risks of investing in the notes and the information contained or incorporated by reference in this prospectus supplement and the accompanying prospectus; (2) have access to, and knowledge of, appropriate analytical tools

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to evaluate, in the context of your particular financial situation, an investment in the notes and the impact the notes will have on your overall investment portfolio; (3) have sufficient financial resources and liquidity to bear all of the risks of an investment in the notes; (4) understand thoroughly the terms of the notes and be familiar with the behavior of any relevant indices and financial markets; and (5) be able to evaluate (either alone or with the help of a financial adviser) possible scenarios for economic, interest rate and other factors that may affect your investment and your ability to bear the applicable risks.

To the extent we would be required to repurchase the notes upon a Change of Control Triggering Event or a special mandatory redemption, we may not have sufficient cash at such time to repurchase all the notes plus all other notes subject to a Change of Control Triggering Event or special mandatory redemption repurchase obligation.

The notes will require us to offer to repurchase all or any part of the notes upon the occurrence of a Change of Control Triggering Event, as defined in the “Description of the Notes—Repurchase Upon Change of Control Triggering Event” section of this prospectus supplement. We may in the future issue additional notes and enter into additional debt instruments that require us to repurchase or repay the principal amount of debt outstanding (plus, in certain circumstances a premium) upon the occurrence of a Change of Control Triggering Event or similar event.

In addition, the notes will be subject to a special mandatory redemption in the event that the closing of the Merger has not occurred on or prior to February 7, 2019, or, if prior to such date, the Merger Agreement is terminated. The Special Mandatory Redemption Price (as defined herein) will be equal to 101% of the aggregate principal amount of the applicable series of notes, plus accrued and unpaid interest to, but excluding, the redemption date. See “Description of the Notes—Special Mandatory Redemption.”

We are not obligated to place the proceeds from this notes offering in escrow prior to the closing of the Merger or to provide a security interest in those proceeds, and there are no other restrictions on our use of these proceeds during such time. Accordingly, we will need to fund any change of control or special mandatory redemption using proceeds that we have voluntarily retained or from other sources of liquidity. If such event were to occur, we may not have sufficient financial resources available to satisfy all those obligations, and consequently we may not be able satisfy our obligations to repurchase your notes.

Holders of the notes may not be able to determine when a change of control giving rise to their right to have the notes repurchased has occurred following a sale of “substantially all” of our assets.

The definition of “change of control” in the notes includes a phrase relating to the direct or indirect sale, lease, transfer, conveyance or other disposition of “all or substantially all” of our and our subsidiaries’ assets. There is no precise, established and binding interpretation of the phrase “substantially all” under applicable law. Accordingly, in certain circumstances there may be a degree of uncertainty as to whether a particular transaction would involve a sale, lease, transfer, conveyance or other disposition of “substantially all” our and our subsidiaries’ assets. As a result, in certain circumstances, it may be unclear whether a Change of Control Triggering Event has occurred and therefore whether a holder of notes has the right to require us to repurchase those notes.

We may redeem the notes at our option, which may adversely affect your return on the notes.

The notes are redeemable at our option, and we may, therefore, choose to redeem all or part of the notes at any time prior to the maturity date, including at times when prevailing interest rates are relatively low. In the event that we redeem the notes prior to maturity, you may not be able to reinvest the proceeds you receive from the redemption in a comparable security at an effective interest rate as high as the interest rate on your notes being redeemed.

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The special mandatory redemption provision of the notes may adversely affect the trading prices and your expected return on such notes.

As a result of the special mandatory redemption provision of the notes, the trading prices of such notes may not reflect the financial results of our business or macroeconomic factors. In addition, if the notes are redeemed prior to maturity, you may not be able to reinvest the amount received upon a redemption in a comparable security at an effective interest rate as high as that of the notes. You will have no rights under the special mandatory redemption provision if the Merger closes within the prescribed time frame, nor will you have any right to require us to repurchase your notes if, between the closing of this notes offering and the closing of the Merger, we experience any changes (including any material changes) in our business or financial condition, or if the terms of the Merger Agreement change, including in material respects.

Risks Related to Frutarom

In addition to the risks we face, Frutarom also faces the following risks.

Frutarom’s operations are subject to effects of the global economy.

Due to the nature and type of its global activity, Frutarom is exposed to fluctuations in the global economy. Economic crisis and recession in various countries in which Frutarom operates could curb demand for Frutarom’s products and significantly slow down the development and launch of new products by Frutarom customers.

Frutarom’s operations in emerging markets are subject to political, economic and legal developments that are less predictable than those in developed markets.

Frutarom operates in a number of countries besides the United States and Western Europe, such as Russia, Ukraine, Turkey, Slovenia, Kazakhstan, China, countries in South and Central America (including Brazil, Guatemala, Peru, Chile and Mexico) and countries in northern, southern and western Africa, and is therefore exposed to political, economic and legal developments in these countries which are generally less predictable than in developed countries. Frutarom’s facilities in these countries could be subject to disruption as a result of economic and/or political instability as well as from nationalization and/or expropriation of assets situated there. There is also substantial risk relating to restrictions on Frutarom in collecting payment from its customers, distributors, or agents, as well as foreign exchange restrictions which could impede Frutarom’s ability to realize its profits or to sell its assets in these countries. While none of the emerging market countries in which Frutarom operates impose foreign exchange restrictions that affect Frutarom, such restrictions existed not long ago and there is no assurance that they will not be reinstated in the future.

Fluctuations or devaluations in currencies may negatively affect Frutarom’s results of operations.

Over 70% of Frutarom’s sales in 2017 were conducted in currencies other than the U.S. dollar, mainly the Euro, Russian Ruble, Pound Sterling, Swiss Franc, New Israeli Shekel, Chinese Yuan, Canadian Dollar, Brazilian Real, South African Rand, Peruvian Nuevo Sol and Mexican Peso, and changes in exchange rates affect Frutarom’s reported results in US dollar terms. In addition, in cases of extreme fluctuations in exchange rates, and since a large part of the raw materials used in the manufacture of Frutarom’s products is paid for in U.S. dollars, in Euros, or other currencies, there is no assurance that Frutarom can completely update its selling prices denominated in local currency (which is different from the currency used in buying the raw material) and maintain its margin. Frutarom does not generally undertake external hedging action nor does it use other financial instruments for protection against currency fluctuations. For further information see Frutarom’s audited financial statements included in this prospectus supplement.

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Frutarom operates in a highly competitive industry.

Frutarom faces competition from large multinationals as well as medium-sized, small and local companies across the sectors in which it operates. Some of Frutarom’s competitors have greater financial and technological resources, larger sales and marketing platforms and more established reputation, and may therefore be better equipped to adapt to changes and industry trends.

The global market for flavors is characterized by close relations between flavor manufacturers and their customers, particularly with regard to large multinationals. Furthermore, many large multinational customers, along with increasing numbers of medium-sized customers in recent years, sometimes limit the number of their suppliers and work predominantly with a list of “approved suppliers.” To compete more effectively under these conditions, Frutarom must invest more resources in customer relations, in R&D and in matching products to customers’ needs in order to provide high quality and efficient service. Any failure to maintain good relations with its customers, forge strong relations with new customers, or secure the status of “approved supplier” with some of its customers could lead to substantial adverse effects on Frutarom’s business, operating results and financial condition.

The specialty fine ingredients market is more price sensitive than the flavors market and is characterized by relatively lower profit margins. Some fine ingredients products manufactured by Frutarom are less unique and more replaceable by competitors’ products. Production overcapacity for fine ingredients globally could also negatively impact Frutarom’s sales and profitability. Although as part of its strategy Frutarom focuses on specialty fine ingredients with higher profit margins, there is no assurance that operating margins will not erode in the future, which could substantially impact Frutarom’s business, operating results and financial condition.

Increased environmental, health and safety regulations or the loss of necessary environmental permits could adversely affect Frutarom’s operating results and financial condition.

Frutarom is subject to a variety of international and domestic health, safety and environmental statutes in the various countries in which it operates. In general, there is a trend towards increased regulation in the fields of Frutarom’s activities. This trend stems from, among other things, growing consumer sensitivity concerning the inclusion of flavor additives in food products and the fact that regulators perceive nutraceuticals, medical food and functional food products as having medicinal attributes. In some countries such products may be subjected to the same standards and regulations as applied to drugs or targeted regulation for these categories. In addition, regulators in different countries can change regulations applying to infant nutrition or clinical nutrition for the elderly in a way that might affect Frutarom’s sales in these categories. Frutarom has identified the markets for nutraceuticals, functional food, specialty fine ingredients for infant nutrition, especially infant formulas, and clinical nutrition for the elderly as important to its future growth. The subjecting of these markets to increased regulation could give rise to additional expenses which might have an adverse effect on Frutarom’s business, operating results and financial condition.

Companies such as Frutarom that operate in the flavor and fine ingredients industry make use of, manufacture, sell, and distribute substances that are sometimes considered hazardous and are therefore subject to extensive regulation concerning the storage, handling, manufacture, transport, use and disposal of such substances and their components and byproducts. Frutarom’s production and R&D activities in the various countries where it operates are subject to various regulations and standards relating to air emissions, sewage treatment and the use, handling and discharge of hazardous material as well as clean-up of existing environmental contamination. Any further tightening of such laws and regulations could have a substantial adverse effect on Frutarom’s business, operating results and financial condition.

In addition to covering its ongoing environmental compliance costs, Frutarom might also incur nonrecurring charges associated with remedial action needed to be taken at its production sites. As environment-related incidents cannot be foreseen with any certainty, the sums that Frutarom allocates or will allocate for such matters

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may turn out to be inadequate. Ongoing and nonrecurring environment-related expenses could each have a substantial adverse effect on Frutarom’s business, operating results and financial condition.

Frutarom is required to obtain various environmental permits concerning operations at its various production facilities and to meet the conditions set by these permits. The expansion of existing plants is also subject to securing necessary permits. Such permits might be unilaterally revoked or modified by the issuer, or might be for a limited amount of time. Any cancellation, modification and/or failure to renew or obtain a permit could have a significant adverse effect on Frutarom’s business, operating results and financial condition.

Failure to comply with environmental, health and safety laws and regulations may expose Frutarom to civil and criminal liability.

The laws and regulations concerning the environment, health and safety may subject Frutarom to civil and/or criminal liability for non-compliance or environmental pollution. Environmental, health and safety laws may include criminal sanctions (including substantial penalties) for violating them. Some environmental laws also include provisions imposing complete responsibility for the release of hazardous substances into the environment which could result in Frutarom becoming liable for clean-up efforts without any negligence or fault on its part. Other environmental laws impose liability jointly and severally, which could expose Frutarom to responsibility for cleaning up environmental pollution caused by others.

In addition, some environmental, health and safety laws are applied retroactively and could impose responsibility for acts done in the past even if such acts were carried out in accordance with the relevant legal provisions in force at the time. Criminal or civil liability under such laws may have significant adverse effects on Frutarom’s business, operating results and financial condition.

Frutarom may also become subjected to claims for personal injury or property damage arising from exposure to hazardous substances. Laws in the major countries where Frutarom operates permit legal proceedings to be instituted against it if personal injury or environmental contamination was ostensibly caused by activity at its production sites in these countries. Such legal proceedings could also be instituted by private individuals or non-governmental organizations.

Fluctuations in prices of raw materials needed for producing Frutarom’s products may negatively impact its results of operations.

The price, quality and availability of the main raw materials that Frutarom uses, especially in the field of natural products, are subject to fluctuations arising from global supply and demand. Many raw materials used by Frutarom are agricultural products whose prices, quality and availability could be affected by, among other things, poor weather conditions. Frutarom does not normally conduct futures transactions in raw materials and is exposed to price fluctuations in the raw materials it uses according to changes in global trends for prices of these raw materials. In recent periods, there has been a rise in the prices of a number of principal raw materials used by Frutarom, and such trends may have a significant adverse effect on Frutarom’s business, operating results and financial condition.

The inability to obtain raw materials due to the loss of third party suppliers or unavailability of raw materials could impair Frutarom’s sales and adversely affect its operating results.

Frutarom is dependent on third parties for the supply of raw materials needed for manufacturing its products. Although Frutarom purchases raw materials from a very wide range of suppliers and no individual supplier accounted for more than 3% of its total raw material usage in 2017, and even though there is more than one supplier for most of the raw materials bought by Frutarom and they are usually readily available, there is no assurance that this will also continue to be the case in the future. Severe weather conditions may cause a significant shortage of natural raw materials used by Frutarom. A shortage of these raw materials could impair Frutarom’s sales for a certain period of time and adversely affect its operating results.

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Product liability claims against Frutarom and potential damages under those claims could have significant adverse effects on Frutarom’s business, operating results and financial condition.

Frutarom is exposed to product liability risk, particularly due to the fact that it supplies flavors to the food and beverage, flavor and fragrance, functional food, pharma/nutraceutical and personal care industries. Should Frutarom be found responsible in a large claim of this type, its insurance coverage might be inadequate to cover damages and/or legal expenses. A lack of adequate insurance coverage could result in a significant adverse effect on Frutarom’s business, operating results and financial condition. Product liability claims brought against Frutarom could damage its reputation as well as put heavy demand on management’s time and efforts, and this could have significant adverse effects on Frutarom’s business regardless of the outcome of the claim.

The inability to integrate the businesses acquired by Frutarom during its recent growth period may lead to disruptions in its business and failure to capitalize on anticipated synergies.

A key element of Frutarom’s growth strategy has been growth through the acquisition of flavor and specialty fine ingredients manufacturers. In line with this strategy, Frutarom has made many strategic acquisitions of companies and business activities in recent years. The integration of acquired activities involves a number of risks, including possible adverse effects on Frutarom’s operating results, the loss of customers, the consuming of senior management’s time and attention, and the failure to retain key personnel including managers of the acquired activities, along with risks associated with unanticipated events in the integration of the operations, technologies, systems and services of the acquired business. In addition, Frutarom may be unable to capitalize on the anticipated synergies (including those aimed at cost savings) inherent in such acquisitions. Failure in successfully integrating its acquisitions could have adverse effects on Frutarom’s business, operating results and financial condition.

The rapid growth, as in recent years, in both Frutarom’s activities and its geographical spread requires effective management to ensure that the financial benefits, tapping of synergies and the economies of scale are achieved. An inability to adapt to the rapid growth could result in losses or acquisition costs that will not be recovered as quickly as anticipated, if at all. Such circumstances could have significant adverse effects on Frutarom’s business, its operating results and financial condition.

The loss of skilled personnel, members of senior management or other key employees could negatively impact Frutarom’s ability to compete and implement its strategy.

Frutarom’s continued future success depends on its ability to attract and retain proficient flavorists (flavor developers), lab technicians and other skilled personnel. Frutarom operates in a highly specialized market where product quality is of critical importance and having skilled personnel is necessary for ensuring the supply of high quality products. If a number of such employees were to leave at the same time, Frutarom could encounter difficulties in finding replacements with equivalent experience and abilities, a situation which could impair Frutarom’s R&D capabilities. Furthermore, Frutarom’s continued success depends to a large extent on its senior management team. The loss of services from members of senior management or other key employees could have a negative impact on Frutarom’s results and its ability to implement its strategy. A failure to recruit and retain skilled personnel or members of senior management could have a significant adverse effect on Frutarom’s business, operating results and financial condition.

The inability to protect its intellectual property or the loss of exclusive use of its proprietary formulas to create flavors may have a significant adverse impact on Frutarom’s business, operating results and financial condition.

Frutarom’s business relies on intellectual property, mainly consisting of formulas used to create its flavors. Frutarom does not register these formulas but they are kept highly confidential and considered trade secrets and, as such, are accessible to just a very limited circle of people within Frutarom. Although Frutarom believes it is

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not significantly reliant on any individual intellectual property right, proprietary formula, patent or license, a breach of confidentiality with respect to the formulas or loss of access to them and/or the future expiration of intellectual property rights could have a significant adverse impact on Frutarom’s business, operating results and financial condition.

Frutarom relies, in part, on confidentiality agreements, ownership of intellectual property, and non-competition agreements with employees, vendors and third parties in order to protect its intellectual property. It is possible that these agreements will be breached and that Frutarom may lack an adequate remedy for any such breach. Disputes may arise concerning the ownership of intellectual property or the extent to which the confidentiality agreements remain in force. Furthermore, Frutarom’s trade secrets may become revealed to its competitors or developed independently by them, in which case Frutarom will not be able to enjoy exclusive use of some of its formulas or maintain confidentiality concerning its products.

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FORWARD-LOOKING STATEMENTS

Statements in this prospectus supplement and the documents incorporated by reference, which are not historical facts or information, are “forward-looking statements” within the meaning of the Private Securities Litigation Reform Act of 1995. Such forward-looking statements are based on management’s current assumptions, estimates and expectations and include statements concerning (i) our ability to achieve long-term sustainable growth and increase shareholder value, (ii) growth potential in the emerging markets, (iii) the anticipated impact of our acquisitions on our market position within key markets, (iv) our competitive position in the market and expected financial results in 2018, (v) expected savings from profit improvement initiatives, (vi) expected capital expenditures and cost pressures in 2018, (vii) the impact of legislation commonly referred to as the Tax Cuts and Jobs Act (the “Tax Act”) on the Company’s effective tax rate in 2018, (viii) the expected level of share repurchases under the Company’s share repurchase program, (ix) our ability to innovate and execute on specific consumer trends and demands, (x) timing of completion or relocation of our plants in China, (xi) expected increases in raw material costs in 2018, (xii) the impact of operational performance, cost reduction efforts and mix enhancement on margin improvement, and (xiii) the amount of expected pension contributions in 2018. These forward-looking statements should be evaluated with consideration given to the many risks and uncertainties inherent in our business that could cause actual results and events to differ materially from those in the forward-looking statements. Certain of such forward-looking information may be identified by such terms as “expect,” “anticipate,” “believe,” “intend,” “outlook,” “may,” “estimate,” “should,” and “predict” and similar terms or variations thereof. Such forward-looking statements are based on a series of expectations, assumptions, estimates and projections about the Company, are not guarantees of future results or performance, and involve significant risks, uncertainties and other factors, including assumptions and projections, for all forward periods. Our actual results may differ materially from any future results expressed or implied by such forward-looking statements. Such factors include, among others, those discussed in the “Risk Factors” section of this prospectus supplement and the following:

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The foregoing list of important factors does not include all such factors, nor necessarily present them in order of importance. In addition, you should consult other disclosures made by the Company (such as in our other filings with the SEC or in company press releases) for other factors that may cause actual results to differ materially from those projected by the Company. For additional information regarding factors that could affect the Company’s results of operations, financial condition and liquidity, see “Risk Factors” in this prospectus supplement and the accompanying prospectus, as well as the risks described in the “Risk Factors” section of the Company’s most recent Annual Report on Form 10-K and our Quarterly Reports on Form 10-Q and as may be included from time to time in our reports filed with the SEC.

The Company intends its forward-looking statements to speak only as of the time of such statements and does not undertake or plan to update or revise them as more information becomes available or to reflect changes in expectations, assumptions or results. The Company can give no assurance that such expectations or forward-looking statements will prove to be correct. An occurrence of, or any material adverse change in, one or more of the risk factors or risks and uncertainties referred to in this prospectus supplement and the accompanying prospectus, or included in any of our periodic reports filed with the SEC and incorporated by reference into this prospectus supplement could materially and adversely impact our results of operations, financial condition and liquidity and our future financial results.

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USE OF PROCEEDS

We estimate that the net proceeds to us from this notes offering, after deducting underwriting discounts and estimated offering expenses payable by us, will be approximately $1,482 million. We intend to use the net proceeds from this offering to pay a portion of the consideration for the Merger and to pay related fees and expenses. See “Summary—Recent Developments.”

Completion of this notes offering is not contingent on completion of the Merger and completion of the Merger is not contingent on the completion of this notes offering. However, if for any reason the closing of the Merger has not occurred on or prior to February 7, 2019, or, if prior to such date, the Merger Agreement is terminated, then in either case we will be required to redeem the notes as described under “Description of the Notes—Special Mandatory Redemption.” See “Summary—Recent Developments.”

The following table outlines the sources and uses of funds for the Merger, reflecting the exercise by the underwriters of their respective options to purchase additional shares of common stock in the common stock offering and additional tangible equity units in the tangible equity units offering. The table assumes that the Merger, this notes offering, the euro notes offering and the common stock and tangible equity units offerings are completed simultaneously, but the common stock and tangible equity units offerings have already been completed and this notes offering and the euro notes offering are expected to occur before completion of the Merger. Amounts in the table are in millions of dollars and are estimated, and actual amounts may vary from the estimated amounts.

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CAPITALIZATION

The following sets forth our capitalization on a consolidated basis as of June 30, 2018:

This table should be read in conjunction with the other sections of this prospectus supplement and our consolidated financial statements and related notes incorporated by reference in this prospectus supplement and the accompanying prospectus. See “Incorporation of Certain Information by Reference” in this prospectus supplement. In addition, investors should not place undue reliance on the pro forma as adjusted information included below because this offering is not contingent upon completion of any of the transactions reflected in the adjustments below.

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UNAUDITED PRO FORMA CONDENSED COMBINED FINANCIAL INFORMATION

On May 7, 2018, IFF, Frutarom and Merger Sub entered into a merger agreement that provides for the acquisition of Frutarom by IFF. Subject to the satisfaction or waiver of certain other closing conditions, IFF will acquire Frutarom through the merger of Merger Sub with and into Frutarom, with Frutarom surviving the merger and becoming a wholly owned subsidiary of IFF.

The following unaudited pro forma condensed combined financial information is presented to illustrate the estimated effects of the merger and certain other adjustments listed below.

The unaudited pro forma condensed combined balance sheet as of June 30, 2018, and the unaudited pro forma condensed combined statements of operations for the six months ended June 30, 2018 and the year ended December 31, 2017, respectively, are presented herein. The unaudited pro forma condensed combined balance sheet combines the unaudited consolidated balance sheets of IFF and Frutarom as of June 30, 2018, and gives effect to the merger as if it occurred on June 30, 2018. The unaudited pro forma condensed combined statements of operations combine the historical results of IFF and Frutarom for the six months ended June 30, 2018, and the year ended December 31, 2017, and give effect to the merger as if it occurred on January 1, 2017. The historical financial information has been adjusted to give effect to pro forma adjustments that are (i) directly attributable to the merger, (ii) factually supportable, and (iii) with respect to the unaudited condensed combined statements of operations, expected to have a continuing impact on the combined entity’s condensed results.

The merger of IFF and Frutarom will be accounted for using the acquisition method of accounting as per the provisions of Accounting Standards Codification 805, “Business Combinations”, which we refer to as ASC 805, with IFF representing the accounting acquirer under this guidance. The unaudited pro forma condensed combined financial statements were prepared in accordance with Article 11 of Regulation S-X and primarily give effect to the merger adjustments, which include:

The pro forma adjustments included in this document are subject to modification based on changes in interest rates, changes in share prices, the final determination of the fair value of the assets acquired and liabilities assumed, additional analysis, and additional information that may become available, which may cause the final adjustments to be materially different from the pro forma condensed combined financial statements presented below. Following the consummation of the merger, IFF management will perform a detailed review of Frutarom’s accounting policies in an effort to determine if differences in accounting policies require further reclassification of Frutarom’s results of operations or reclassification of assets or liabilities to conform to IFF’s accounting policies and classification. As a result, IFF may subsequently identify additional material differences in the accounting policies which could have a material impact on the unaudited pro forma combined financial information.

The unaudited pro forma condensed combined financial information presented is for informational purposes only and is not necessarily indicative of the financial position or results of operations that would have been realized if the merger had been completed on the dates set forth above, nor is it indicative of future results or financial position of the combined company. Additionally, the final determination of the purchase price and the purchase price allocation, upon the completion of the merger, will be based on Frutarom’s net assets acquired as

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of that date and will depend on a number of factors that cannot be predicted with certainty at this time. The unaudited pro forma condensed combined financial information does not reflect any anticipated synergies or dis-synergies, operating efficiencies or cost savings that may result from the merger or potential divestitures that may occur prior to, or subsequent to, the completion of the merger or any acquisition and integration costs that may be incurred. The pro forma adjustments, which IFF believes are reasonable under the circumstances, are preliminary and are based upon available information and certain assumptions described in the accompanying notes to the unaudited pro forma condensed combined financial information. Actual results and valuations may differ materially from the assumptions within the accompanying unaudited pro forma condensed combined financial information. Any changes to IFF’s stock price, from September 17, 2018 through the date the merger is completed, will also change the purchase price, which may include the recording of a lower or higher amount of goodwill. The final adjustments may be materially different from the pro forma condensed combined financial statements presented in this document.

The unaudited pro forma condensed combined financial information should be read in conjunction with the notes to the unaudited pro forma condensed combined financial information, Frutarom’s audited financial statements for the year ended December 31, 2017 and Frutarom’s unaudited quarterly financial statements for the quarterly period ended June 30, 2018, as well as IFF’s consolidated financial statements and related notes thereto contained in its Annual Report on Form 10-K for the year ended December 31, 2017 and IFF’s Quarterly Report on Form 10-Q for the quarterly period ended June 30, 2018.

Pro Forma Assumptions since September 17, 2018

The unaudited pro forma condensed combined financial information presented in this section, which was prepared as of September 17, 2018, does not reflect results, events or changes subsequent to September 17, 2018. In particular, this section does not give effect to the following results, events and changes, which individually and in the aggregate would not have had a material effect on the pro forma condensed combined financial information presented in this section:

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Unaudited Pro Forma Condensed Combined Balance Sheet

As of June 30, 2018

See the accompanying “Notes to the Unaudited Pro Forma Condensed Combined Financial Information”, which are an integral part hereof. The pro forma adjustments are explained in the notes below.

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Unaudited Pro Forma Condensed Combined Statement of Operations

For the Six Months Ended June 30, 2018

See the accompanying “Notes to the Unaudited Pro Forma Condensed Combined Financial Information”, which are an integral part hereof. The pro forma adjustments are explained in the notes below.

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Unaudited Pro Forma Condensed Combined Statement of Operations

For the Year Ended December 31, 2017