Exhibit 4.3



ZQ|CERT#|COY|CLS|RGSTRY|ACCT#|TRANSTYPE|RUN#|TRANS#   . COMMON STOCK PAR VALUE $0.01 COMMON STOCK Shares * * 000000 * * * * * * * *   * * * * * * * * * * * * * 000000 * * * * * * * * * * * * * * * * * * * * *   000000 * * * * * * * * * * * * * * * * * * * * * 000000 * * * * * * * * * * *   * * * * * * * * * * 000000 * * * * * * * * * * * * * * Certificate Number   ZQ00000000 CF INDUSTRIES HOLDINGS, INC. INCORPORATED UNDER THE LAWS OF THE   STATE OF DELAWARE ** Mr. Alexander David Sample **** Mr. Alexander David   Sample **** Mr. Alexander David Sample **** Mr. Alexander David Sample ****   Mr. Alexander David Sample **** Mr. Alexander David Sample **** Mr. Alexander   David Sample **** Mr. Alexander David Sample **** Mr. Alexander David Sample   **** Mr. Alexander David SEE REVERSE FOR CERTAIN DEFINITIONS THIS CERTIFIES   THAT Sample **** Mr. Alexander David Sample **** Mr. Alexander David Sample   **** Mr. Alexander David Sample **** Mr. Alexander David Sample **** Mr.   Alexander Alexander David SamMple ***R* Mr. A.lexaSnderADavidMSampPle ***L*   MrE. Alexan&der DavMid SamRple **S** Mr.. AleSxandeAr DaMvid SamPple   *L*** MEr. Alex&ander David Sample **** David Sample **** Mr. Alexander   David Sample **** Mr. Alexander David Sample **** Mr. Alexander David Sample ****   Mr. Alexander David Sample **** Mr. Mr. Alexander David Sample **** Mr.   Alexander David Sample **** Mr. Alexander David Sample **** Mr. Alexander   David Sample **** Mr. Alexander David Sample **** Mr. Alexander DavidMSampRle   ****.Mr. SAlexaAnderMDavidPSamLple *E*** Mr. &AlexandMer DavRid   SaSmple.**** SMr. AAlexanMder DaPvid SLampEle **** Mr. Alexander David Sample   **** Mr. Alexander David Sample **** Mr. Alexander David Sample **** Mr.   Alexander David Sample **** Mr. Alexander David Sample **** Mr. Alexander   David Sample **** Mr. Alexander David Sample **** Mr. Alexander David Sample   **** Mr. Alexander David Sample **** Mr. Alexander David Sample **** Mr.   Alexander David Sample **** Mr. Alexander David Sample **** Mr. Alexander   David Sample **** Mr. Alexander David Sample **** Mr. Alexander David Sample   **** Mr. Alexander David Sample **** Mr. Alexander David Sample **** Mr.   Alexander David Sample **** Mr. Alexander David Sample **** Mr. Sample ****   Mr. Sample is the owner of **000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares***   *000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****   000000**Shar*es****0*000Z00**SEhareRs****00O0000**ShHares**U**0000N00**SDhares*R***000E000**DShares**T**000H000**SOhares*U***000S000**AShareNs****00D0000**Shares****0   THIS CERTIFICATE IS TRANSFERABLE IN CITIES DESIGNATED BY THE TRANSFER AGENT,   AVAILABLE ONLINE AT www.computershare.com   00000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****00   0000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000   000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****0000   0**Shares****00Z0000E**ShaRres****O000000**HSharesU****00N0000**DShareRs****00E0000D**SharesA****00N0000*D*Shares**Z**000E000**RShareOs****00*000*0***Shares****000000   00**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****00000   **Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000*   *Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**   Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**S   FULLY-PAID AND NON-ASSESSABLE SHARES OF COMMON STOCK, $0.01 PAR VALUE, OF CF   INDUSTRIES HOLDINGS, INC. transferable on the books of the Corporation by the   said holder, in person or by Attorney, upon surrender of this Certificate   properly endorsed. This Certificate is not valid unless countersigned by the   Transfer Agent and registered by the Registrar. Witness the facsimile seal of   the Corporation and the facsimile signatures of its duly authorized officers.   DATED DD-MMM-YYYY COUNTERSIGNED AND REGISTERED: COMPUTERSHARE TRUST COMPANY,   N.A. TRANSFER AGENT AND REGISTRAR, President and Chief Executive Officer 2005   DELAWARE Senior Vice President, General Counsel, and Secretary By AUTHORIZED   SIGNATURE CUSIP Holder ID Insurance Value Number of Shares DTC Certificate   Numbers 1234567890/1234567890 1234567890/1234567890 1234567890/1234567890   1234567890/1234567890 1234567890/1234567890 1234567890/1234567890 Total   Transaction XXXXXX XX X XXXXXXXXXX 1,000,000.00 123456 12345678   123456789012345 PO BOX 43004, Providence, RI 02940-3004 Num/No. Denom. Total   1 2 3 4 5 6 7 1 2 3 4 5 6 1 2 3 4 5 6 MR A SAMPLE DESIGNATION (IF ANY) ADD 1   ADD 2 ADD 3 ADD 4 F CUSIP 125269 10 0 


    




 









 



. CF Industries   Holdings, Inc. (the “Corporation”) will furnish without charge to each   stockholder who so requests in writing to the Corporation at its principal   office, a copy of the powers, designations, preferences and relative,   participating, optional, or other special rights of each class of stock or   series thereof and the qualifications, limitations or restrictions of such   preferences and/or rights. (Cust) (Minor) (State) (Cust) and not as tenants   in common (Minor) (State) PLEASE INSERT SOCIAL SECURITY OR OTHER IDENTIFYING   NUMBER OF ASSIGNEE For value received, hereby sell, assign and transfer unto   (PLEASE PRINT OR TYPEWRITE NAME AND ADDRESS INCLUDING ZIP CODE OF ASSIGNEE)   shares of the common stock represented by the within Certificate and do   hereby irrevocably constitute and appoint Attorney to transfer the said stock   on the books of the within named Corporation with full power of substitution   in the premises. Dated: 20 Signature: Signature: Notice: The signature to   this assignment must correspond with the name as written upon the face of the   certificate in every particular, without alteration or enlargement, or any   change whatever. KEEP THIS STOCK CERTIFICATE IN A SAFE PLACE. IF IT IS LOST,   STOLEN, OR DESTROYED, THE CORPORATION WILL REQUIRE A BOND OF INDEMNITY AS A   CONDITION TO THE ISSUANCE OF A REPLACEMENT CERTIFICATE. The IRS requires that   we report the cost basis of certain shares acquired after January 1, 2011. If   your shares were covered by the legislation and you have sold or transferred   the shares and requested a specific cost basis calculation method, we have   processed as requested. If you did not specify a cost basis calculation   method, we have defaulted to the first in, first out (FIFO) method. Please   visit our website or consult your tax advisor if you need additional   information about cost basis. If you do not keep in contact with us or do not   have any activity in your account for the time periods specified by state   law, your property could become subject to state unclaimed property laws and transferred   to the appropriate state. Signature(s) Guaranteed: Medallion Guarantee Stamp   THE SIGNATURE(S) SHOULD BE GUARANTEED BY AN ELIGIBLE GUARANTOR INSTITUTION   (Banks, Stockbrokers, Savings and Loan Associations and Credit Unions) WITH   MEMBERSHIP IN AN APPROVED SIGNATURE GUARANTEE MEDALLION PROGRAM, PURSUANT TO   S.E.C. RULE 17Ad-15. The following abbreviations, when used in the   inscription on the face of this certificate, shall be construed as though   they were written out in full according to applicable laws or regulations:   TEN COM - as tenants in common UNIF GIFT MIN ACT -   ............................................Custodian   ................................................ TEN ENT - as tenants by the   entireties under Uniform Gifts to Minors Act.........................................................   JT TEN - as joint tenants with right of survivorship UNIF TRF MIN ACT -   ............................................Custodian (until age   ................................) .............................under Uniform   Transfers to Minors Act ................... Additional abbreviations may also   be used though not in the above list.