Exhibit 99.3

Ponsi Trivisvavet President, Syngenta Seeds, LLC Syngenta Seeds, LLC 11055 Wayzata Blvd. Minnetonka, MN 55305 Tel 612.656.8319 E-mail: ponsi.trivisvavet@syngenta.com Vern Hawkins President, Syngenta Crop Protection, LLC Syngenta Crop Protection, LLC P.O. Box 18300 Greensboro, NC 27419-8300 Tel 336.632.7545 E-mail: vern.hawkins@syngenta.com

February 3, 2016

Dear customer:

Today we announced that China National Chemical Corporation (ChemChina) has made an offer to acquire Syngenta, which has the unanimous recommendation of our Board of Directors. The transaction could be concluded by the end of the year, subject to shareholder acceptance and regulatory approvals.

The terms of this agreement will enable Syngenta to retain its name, its management, its broad portfolio and geographic presence. Syngenta will remain headquartered in Switzerland and is committed to continue company operations to ensure it will be business as usual for our customers, business partners, employees, stakeholders and the communities we serve.

We are excited about the opportunities this agreement is expected to create, including confirmation of our commitment to long-term investment in the research and development of new technologies across seeds, traits and crop protection to enhance productivity for agriculture and our customers. Equally important, it will allow you to continue to benefit from multiple choices and competition within the sector, a sector which has recently seen considerable consolidation.

We remain committed to providing you technology offers and services that add value to your business and we will continue to focus on earning your confidence and support to partner with Syngenta. We highly value your business and look forward to continue strengthening our partnership with you. Your Syngenta account manager will not change as a result of this agreement and he/she is available to answer any questions you may have about this Syngenta shareholder ownership change.

Kind regards,

/s/ Vern Hawkins	/s/ Ponsi Trivisvavet
Vern Hawkins	Ponsi Trivisvavet
President	President
Syngenta Crop Protection, LLC	Syngenta Seeds, LLC

ADDITIONAL INFORMATION AND WHERE TO FIND IT

THE TENDER OFFER FOR THE OUTSTANDING SHARES, AMERICAN DEPOSITARY SHARES AND OTHER OUTSTANDING EQUITY INSTRUMENTS IN THE COMPANY HAS NOT BEEN COMMENCED. THIS ANNOUNCEMENT IS FOR INFORMATIONAL PURPOSES ONLY AND DOES NOT CONSTITUTE AN OFFER TO PURCHASE OR A SOLICITATION OF AN OFFER TO SELL COMPANY SECURITIES. THE SOLICITATION AND OFFER TO BUY COMPANY SECURITIES WILL ONLY BE MADE PURSUANT TO AN OFFER TO PURCHASE AND RELATED MATERIALS. AT THE TIME THE OFFER IS COMMENCED, CHEMCHINA WILL FILE A TENDER OFFER STATEMENT ON SCHEDULE TO WITH THE U.S. SECURITIES AND EXCHANGE COMMISSION (“SEC”) AND THEREAFTER, THE COMPANY WILL FILE A SOLICITATION/RECOMMENDATION STATEMENT ON SCHEDULE 14D- 9 WITH RESPECT TO THE OFFER. INVESTORS AND SECURITY HOLDERS ARE URGED TO READ THESE MATERIALS CAREFULLY WHEN THEY BECOME AVAILABLE SINCE THEY WILL CONTAIN IMPORTANT INFORMATION, INCLUDING THE TERMS AND CONDITIONS OF THE OFFER. THE OFFER TO PURCHASE, SOLICITATION/RECOMMENDATION STATEMENT AND RELATED MATERIALS WILL BE FILED BY CHEMCHINA AND THE COMPANY WITH THE SEC, AND INVESTORS AND SECURITY HOLDERS MAY OBTAIN A FREE COPY OF THESE MATERIALS (WHEN AVAILABLE) AND OTHER DOCUMENTS FILED BY CHEMCHINA AND THE COMPANY WITH THE SEC AT THE WEBSITE MAINTAINED BY THE SEC AT WWW.SEC.GOV. INVESTORS AND SECURITY HOLDERS MAY ALSO OBTAIN FREE COPIES OF THE SOLICITATION/RECOMMENDATION STATEMENT AND OTHER DOCUMENTS FILED WITH THE SEC BY THE COMPANY AT WWW.SYNGENTA.COM.

CAUTIONARY STATEMENT REGARDING FORWARD-LOOKING STATEMENTS

SOME OF THE STATEMENTS CONTAINED IN THIS ANNOUNCEMENT ARE FORWARD-LOOKING STATEMENTS, INCLUDING STATEMENTS REGARDING THE EXPECTED CONSUMMATION OF THE ACQUISITION, WHICH INVOLVES A NUMBER OF RISKS AND UNCERTAINTIES, INCLUDING THE SATISFACTION OF CLOSING CONDITIONS FOR THE ACQUISITION, SUCH AS REGULATORY APPROVAL FOR THE TRANSACTION AND THE TENDER OF AT LEAST 67% OF THE OUTSTANDING SHARES OF THE COMPANY, THE POSSIBILITY THAT THE TRANSACTION WILL NOT BE COMPLETED AND OTHER RISKS AND UNCERTAINTIES DISCUSSED IN THE COMPANY’S PUBLIC FILINGS WITH THE SEC, INCLUDING THE “RISK FACTORS” SECTION OF THE COMPANY’S FORM 20-F FILED ON FEBRUARY 12, 2015, AS WELL AS THE TENDER OFFER DOCUMENTS TO BE FILED BY CHEMCHINA AND THE SOLICITATION/RECOMMENDATION STATEMENT TO BE FILED BY THE COMPANY. THESE STATEMENTS ARE BASED ON CURRENT EXPECTATIONS, ASSUMPTIONS, ESTIMATES AND PROJECTIONS, AND INVOLVE KNOWN AND UNKNOWN RISKS, UNCERTAINTIES AND

OTHER FACTORS THAT MAY CAUSE RESULTS, LEVELS OF ACTIVITY, PERFORMANCE OR ACHIEVEMENTS TO BE MATERIALLY DIFFERENT FROM ANY FUTURE STATEMENTS. THESE STATEMENTS ARE GENERALLY IDENTIFIED BY WORDS OR PHRASES SUCH AS “BELIEVE”, “ANTICIPATE”, “EXPECT”, “INTEND”, “PLAN”, “WILL”, “MAY”, “SHOULD”, “ESTIMATE”, “PREDICT”, “POTENTIAL”, “CONTINUE” OR THE NEGATIVE OF SUCH TERMS OR OTHER SIMILAR EXPRESSIONS. IF UNDERLYING ASSUMPTIONS PROVE INACCURATE OR UNKNOWN RISKS OR UNCERTAINTIES MATERIALIZE, ACTUAL RESULTS AND THE TIMING OF EVENTS MAY DIFFER MATERIALLY FROM THE RESULTS AND/OR TIMING DISCUSSED IN THE FORWARD-LOOKING STATEMENTS, AND YOU SHOULD NOT PLACE UNDUE RELIANCE ON THESE STATEMENTS. CHEMCHINA AND THE COMPANY DISCLAIM ANY INTENT OR OBLIGATION TO UPDATE ANY FORWARD-LOOKING STATEMENTS AS A RESULT OF DEVELOPMENTS OCCURRING AFTER THE PERIOD COVERED BY THIS REPORT OR OTHERWISE.