Filing pursuant to Rule 425 under the

Securities Act of 1933, as amended

Deemed filed under Rule 14a-12 under the

Securities Exchange Act of 1934, as amended

Filer: International Flavors & Fragrances Inc.

Subject Company: International Flavors & Fragrances Inc.

Filer’s Commission File Number: 1-4858

Date: February 18, 2020

Dear Colleague, We are pleased to provide an update on the progress made and efforts underway to bring IFF and N&B together. As we have said before, this combination is the next big step on our journey to become an invaluable innovation and creative partner to our customers, and we are so excited to be going on this journey with all of you. While it’s been just about two months since we announced our agreement to combine, Rich and I have already been hitting the road to meet with you, answer your questions and prepare for integrating our teams, businesses and ways of doing business. We have had the chance to talk with many of you since December and will continue to travel to locations across the IFF network in the coming months. We’ve held town hall meetings with teams so far in Hilversum, Neuilly and New York, with more to come, and each of these conversations have reaffirmed our belief that IFF and N&B are perfect partners. We share not only customers but a commitment to creativity, science, innovation and sustainability that is exciting, empowering and position us to lead. This is a truly transformative moment for our companies and one that will present tremendous opportunities for all our stakeholders, including our employees and customers. While we are all

laser-focused on executing on our business plan for 2020, the effort to bring IFF and N&B together is well underway. As a first step to define the new IFF and prepare for the integration of our companies, we have established a joint Integration Management Office (IMO), which will oversee the broader vision and strategy while developing a roadmap required to bring IFF and N&B together. Rich has taken on leadership of the joint IMO for IFF, and we are pleased to say that Angela Naef, Global Tech & Innovation Leader for N&B, will serve as co-lead in this effort. Together they bring unparalleled knowledge of our respective businesses and a diverse operating perspective. Their combination of experience and leadership best positions us to bring this combination to life. Importantly, the IMO will be supported by several additional members from across the organizations. You can find more information on these individuals below: So… what comes next? We are in the process of finalizing the larger integration team responsible for carrying out planning and execution at the operational level. These groups will be comprised of representatives from both organizations and will be developed and announced over time. Over the coming weeks and months, we will continue to share regular updates as we refine the purpose, vision and strategy behind this exciting combination. We have established a centralized mailbox at NBIMO@IFF.com that will serve as an additional resource for any questions or feedback that you may have regarding the integration process. This address will be the source mailbox for N&B integration-related emails going forward. For additional perspective on the potential for this combination and our plans for integration, we recommend viewing a town hall presentation that was recently held in our New York City office. Of course, we also plan to spend much of our time on the road visiting many more IFF sites to gain additional perspective from you all as we progress through the integration process.

You can also sign up for alerts on IFFConnect to receive regular integration updates! We recommend you set up a “Watch,” where you can choose which topics you receive in your inbox. Click here for more information and follow these instructions to download the mobile app version. For now, it remains business as usual until the close of the transaction, which we continue to expect will occur at the end of the first quarter of 2021. Until then, we remain independent entities with our own operations and operational goals and successful execution of our business strategy will be critical to ensure that we are best positioned to hit the ground running once we complete the transaction. Thank you for your continued hard work and dedication. You are a core reason why this combination is possible and why we are so excited for our future. Here’s to great things ahead! Sincerely, Andreas Fibig, Chairman & CEO, IFF Rich O’Leary, EVP, Integration Officer, IFF IFF CEO Andreas Fibig and N&B President Matthias Heinzel with members of Management in Wilmington, DE. (L to R) : Rich O’Leary (IFF), Jenn Johnson (N&B), Matthias Heinzel (N&B), Angela Naef (N&B), Andreas Fibig (IFF), Simon Herriott (N&B), Greg Yep (IFF) and Nicolas Mirzayantz (IFF).

Additional Information and Where to Find It This communication is not intended to and shall not constitute an offer to sell or the solicitation of an offer to sell or the solicitation of an offer to buy any securities or a solicitation of any vote of approval, nor shall there be any sale of securities in any jurisdiction in which such offer, solicitation or sale would be unlawful prior to registration or qualification under the securities laws of any such jurisdiction. No offer of securities shall be made except by means of a prospectus meeting the requirements of Section 10 of the Securities Act of 1933, as amended (the “Securities Act”). In connection with the proposed combination of Nutrition & Biosciences, Inc. (“N&Bco”), a wholly owned subsidiary of DuPont de Nemours, Inc. (“DuPont”), and International Flavors & Fragrances Inc. (“IFF”), which will immediately follow the proposed separation of N&Bco from DuPont (the “proposed transaction”), N&Bco and IFF intend to file relevant materials with the SEC, including a registration statement on Form S-4 that will include a proxy statement/prospectus relating to the proposed transaction. In addition, N&Bco expects to file a registration statement in connection with its separation from DuPont. INVESTORS AND SECURITY HOLDERS ARE URGED TO READ THE REGISTRATION STATEMENTS, PROXY STATEMENT/PROSPECTUS AND ANY OTHER RELEVANT DOCUMENTS WHEN THEY BECOME AVAILABLE BECAUSE THEY WILL CONTAIN IMPORTANT INFORMATION ABOUT IFF, N&BCO AND THE PROPOSED TRANSACTION. A definitive proxy statement will be sent to shareholders of IFF seeking approval of the proposed transaction. The documents relating to the proposed transaction (when they are available) can be obtained free of charge from the SEC’s website at www.sec.gov. The proxy statement, prospectus and/or information statement and other documents (when they are available) will also be available free of charge on IFF’s website at https://ir.iff.com/ or on DuPont’s website at https://www.investors.dupont.com/investors/dupont-investors/default.aspx. Cautionary Note on Forward-Looking Statements This communication contains “forward-looking statements” within the meaning of the federal securities laws, including Section 27A of the Securities Act, and Section 21E of the Securities Exchange Act of 1934, as amended (the “Exchange Act”). In this context, forward-looking statements often address expected future business and financial performance and financial condition, and often contain words such as “expect,” “anticipate,” “intend,” “plan,” “believe,” “seek,” “see,” “will,” “would,” “target,” similar expressions, and variations or negatives of these words. Forward-looking statements by their nature address matters that are, to different degrees, uncertain, such as statements about the proposed transaction, the expected timetable for completing the proposed transaction, the benefits and synergies of the proposed transaction, future opportunities for the combined company and products and any other statements regarding DuPont’s, IFF’s and N&Bco’s future operations, financial or operating results, capital allocation, dividend policy, debt ratio, anticipated business levels, future earnings, planned activities, anticipated growth, market opportunities, strategies, competitions, and other expectations and targets for future periods. There are several factors which could cause actual plans and results to differ materially from those expressed or implied in forward-looking statements. Such factors include, but are not limited to, (1) the parties’ ability to meet expectations regarding the timing, completion and accounting and tax treatments of the proposed transaction, (2) changes in relevant tax and other laws, (3) any failure to obtain necessary regulatory approvals, approval of IFF’s shareholders, anticipated tax treatment or any required financing or to satisfy any of the other conditions to the proposed transaction, (4) the possibility that unforeseen liabilities, future capital expenditures, revenues, expenses, earnings, synergies, economic performance, indebtedness, financial condition, losses, future prospects, business and management strategies that could impact the value, timing or pursuit of the proposed transaction, (5) risks and costs and pursuit and/or implementation of the separation of N&Bco, including timing anticipated to complete the separation, any changes to the configuration of businesses included in the separation if implemented, (6) risks related to indemnification of certain legacy liabilities of E. I. du Pont de Nemours and Company (“Historical EID”) in connection with the distribution of Corteva Inc. on June 1, 2019 (the “Corteva Distribution”), (7) potential liability arising from fraudulent conveyance and similar laws in connection with DuPont’s distribution of Dow Inc. on April 1, 2019 and/or the Corteva Distributions (the “Previous Distributions”), (8) failure to effectively manage acquisitions, divestitures, alliances, joint ventures and other portfolio changes, including meeting conditions under the Letter Agreement entered in connection with the Corteva Distribution, related to the transfer of certain levels of assets and businesses, (9) uncertainty as to the long-term value of DuPont common stock, (10) potential inability or reduced access to the capital markets or increased cost of borrowings, including as a result of a credit rating downgrade, (11) inherent uncertainties involved in the estimates and judgments used in the preparation of financial statements and the providing of estimates of financial measures, in accordance with the accounting principles generally accepted in the United States of America and related standards, or on an adjusted basis, (12) the integration of IFF and its Frutarom business and/or N&Bco being more difficult, time consuming or costly than expected, (13) the failure to achieve expected or targeted future financial and operating performance and results, (14) the possibility that IFF may be unable to achieve expected benefits, synergies and operating efficiencies in connection with the proposed transaction within the expected time frames or at all or to successfully integrate Frutarom and N&Bco, (15) customer loss and business disruption being greater than expected following the proposed transaction, (16) the impact of divestitures required as a condition to consummation of the proposed transaction as well as other conditional commitments, (17) legislative, regulatory and economic developments; (18) an increase or decrease in the anticipated transaction taxes (including due to any changes to tax legislation and its impact on tax rates (and the timing of the effectiveness of any such changes)) to be paid in connection with the separation prior to the closing of the transactions could cause an adjustment to the exchange ratio, (19) potential litigation relating to the proposed transaction that could be instituted against DuPont, IFF or their respective directors, (20) risks associated with third party contracts containing consent and/or other provisions that may be triggered by the proposed transaction, (21) negative effects of the announcement or the consummation of the transaction on the market price of DuPont’s and/or IFF’s common stock, (22) risks relating to the value of the IFF shares to be issued in the transaction and uncertainty as to the long-term value of IFF’s common stock, (23) risks relating to IFF’s ongoing investigations into improper payments made in Frutarom businesses principally operating in Russia and the Ukraine, including expenses incurred with respect to the investigations, the cost of any remedial measures or compliance programs arising out of the investigations, legal proceedings or government investigations that may arise relating to the subject of IFF’s investigations, and the outcome of any such legal or government investigations, such as the imposition of fines, penalties, orders, or injunctions, (24) the impact of the failure to comply with U.S. or foreign anti-corruption and anti-bribery laws and regulations, including with respect to IFF’s ongoing investigations into improper payments made in Frutarom

businesses principally operating in Russia and the Ukraine, (25) the impact of the outcome of legal claims, regulatory investigations and litigation, including any that may arise out of IFF’s ongoing investigations into improper payments made in Frutarom businesses principally operating in Russia and the Ukraine, (26) the ability of N&Bco or IFF to retain and hire key personnel, (27) the risk that N&Bco, as a newly formed entity that currently has no credit rating, will not have access to the capital markets on acceptable terms, (28) the risk that N&Bco and IFF will incur significant indebtedness in connection with the potential transaction, and the degree to which IFF will be leveraged following completion of the potential transaction may materially and adversely affect its business, financial condition and results of operations, (29) the ability to obtain or consummate financing or refinancing related to the transaction upon acceptable terms or at all, and (30) other risks to DuPont’s, N&Bco’s and IFF’s business, operations and results of operations including from: failure to develop and market new products and optimally manage product life cycles; ability, cost and impact on business operations, including the supply chain, of responding to changes in market acceptance, rules, regulations and policies and failure to respond to such changes; outcome of significant litigation, environmental matters and other commitments and contingencies; failure to appropriately manage process safety and product stewardship issues; global economic and capital market conditions, including the continued availability of capital and financing, as well as inflation, interest and currency exchange rates; changes in political conditions, including tariffs, trade disputes and retaliatory actions; impairment of goodwill or intangible assets; the availability of and fluctuations in the cost of energy and raw materials; business or supply disruption, including in connection with the Previous Distributions; security threats, such as acts of sabotage, terrorism or war, natural disasters and weather events and patterns which could result in a significant operational event for DuPont, N&Bco or IFF, adversely impact demand or production; ability to discover, develop and protect new technologies and to protect and enforce DuPont’s, N&Bco’s or IFF’s intellectual property rights; unpredictability and severity of catastrophic events, including, but not limited to, acts of terrorism or outbreak of war or hostilities, as well as management’s response to any of the aforementioned factors. These risks, as well as other risks associated with the proposed merger, will be more fully discussed in the registration statement and merger proxy on Form S-4 to be filed by IFF and the registration statement on Form 10 to be filed by N&Bco. While the list of factors presented here is, and the list of factors to be presented in any registration statement filed in connection with the transaction are, considered representative, no such list should be considered to be a complete statement of all potential risks and uncertainties. Unlisted factors may present significant additional obstacles to the realization of forward looking statements. Further lists and descriptions of risks and uncertainties can be found in each of IFF’s and DuPont’s Form 10-Q for the period ended September 30, 2019 and each of IFF’s and DuPont’s respective subsequent reports on Form 10-Q, Form 10-K and Form 8-K, the contents of which are not incorporated by reference into, nor do they form part of, this announcement. Any other risks associated with the proposed transaction will be more fully discussed in any registration statement filed with the SEC. While the list of factors presented here is, and the list of factors that may be presented in a registration statement of IFF or N&Bco would be, considered representative, no such list should be considered to be a complete statement of all potential risks and uncertainties. Unlisted factors may present significant additional obstacles to the realization of forward looking statements. Consequences of material differences in results as compared with those anticipated in the forward-looking statements could include, among other things, business disruption, operational problems, financial loss, legal liability to third parties and similar risks, any of which could have a material adverse effect on IFF’s, DuPont’s or N&Bco’s consolidated financial condition, results of operations, credit rating or liquidity. None of IFF, DuPont nor N&Bco assumes any obligation to publicly provide revisions or updates to any forward-looking statements, whether as a result of new information, future developments or otherwise, should circumstances change, except as otherwise required by securities and other applicable laws. Participants in the Solicitation This communication is not a solicitation of a proxy from any investor or security holder. However, DuPont, IFF and certain of their respective directors and executive officers may be deemed to be participants in the solicitation of proxies in connection with the proposed transaction under the rules of the SEC. Information about the directors and executive officers of DuPont may be found in its Annual Report on Form 10-K filed with the SEC on February 11, 2019 and its definitive proxy statement filed with the SEC on May 1, 2019. Information about the directors and executive officers of IFF may be found in its definitive proxy statement filed with the SEC on March 18, 2019. Other information regarding the participants in the proxy solicitation and a description of their direct and indirect interests, by security holdings or otherwise, will be contained in the registration statements, prospectuses and proxy statement and other relevant materials to be filed with the SEC when they become available.