Using a black ink pen, mark your votes with an X as shown in this example. Please do not write outside the designated areas. X 01SRLD 1 U P X + . + A The Board of Directors recommends a vote FOR all the nominees listed and FOR Proposals 2 and 3. For Against Abstain 1. The Board of Directors has nominated the below eight persons to stand for election as directors. As of the date of the accompanying proxy statement, no one has been nominated to serve as director other than the nominees listed below. 2. The proposal to ratify the appointment by the Audit Committee of Ernst & Young LLP as our independent registered public accounting firm for 2014. For Against Abstain 3. To approve, on a non-binding advisory basis, the compensation philosophy, policies and procedures, and the compensation of our Company’s named executive officers, as disclosed in the accompanying Proxy Statement. Annual Meeting Proxy Card 01 - Anthony J. Best 04 - William J. Gardiner 07 - John M. Seidl 02 - Larry W. Bickle 05 - Loren M. Leiker 03 - Stephen R. Brand 06 - Julio M. Quintana For Against Abstain For Against Abstain 08 - William D. Sullivan For Against Abstain IMPORTANT ANNUAL MEETING INFORMATION Authorized Signatures — This section must be completed for your vote to be counted. — Date and Sign Below B Please sign exactly as name(s) appears hereon. Joint owners should each sign. When signing as attorney, executor, administrator, corporate officer, trustee, guardian, or custodian, please give full title. Signature 1 — Please keep signature within the box. Signature 2 — Please keep signature within the box. Date (mm/dd/yyyy) — Please print date below. NNNNNNNNNNNN NNNNNNN 1 8 6 1 9 1 1 MR A SAMPLE (THIS AREA IS SET UP TO ACCOMMODATE 140 CHARACTERS) MR A SAMPLE AND MR A SAMPLE AND MR A SAMPLE AND MR A SAMPLE AND MR A SAMPLE AND MR A SAMPLE AND MR A SAMPLE AND MR A SAMPLE AND NNNNNNNNN C 1234567890 J N T 1234 5678 9012 345 000000000.000000 ext 000000000.000000 ext 000000000.000000 ext 000000000.000000 ext 000000000.000000 ext 000000000.000000 ext 000004 MR A SAMPLE DESIGNATION (IF ANY) ADD 1 ADD 2 ADD 3 ADD 4 ADD 5 ADD 6 ENDORSEMENT_LINE______________ SACKPACK_____________ C123456789 MMMMMMMMMMMMMMM qIF YOU HAVE NOT VOTED VIA THE INTERNET OR TELEPHONE, FOLD ALONG THE PERFORATION, DETACH AND RETURN THE BOTTOM PORTION IN THE ENCLOSED ENVELOPE.q Electronic Voting Instructions You can vote by Internet or telephone! Available 24 hours a day, 7 days a week! Instead of mailing your proxy, you may choose one of the two voting methods outlined below to vote your proxy. VALIDATION DETAILS ARE LOCATED BELOW IN THE TITLE BAR. Proxies submitted by the Internet or telephone must be received by 1:00 a.m., MST on May 20, 2014. Vote by Internet • Go to www.investorvote.com/SM • Or scan the QR code with your smartphone • Follow the steps outlined on the secure website Vote by telephone • Call toll free 1-800-652-VOTE (8683) within the USA, US territories & Canada on a touch tone telephone • Follow the instructions provided by the recorded message IF VOTING BY MAIL, YOU MUST COMPLETE SECTIONS A – C ON BOTH SIDES OF THIS CARD. Admission Ticket

. Proxy — SM Energy Company Electronic Delivery of Future Proxy Materials If you would like to reduce the costs incurred by us in mailing proxy materials, you can consent to receiving all future proxy statements, proxy cards and annual reports electronically via e-mail or the Internet. To sign up for electronic delivery, please follow the instructions on the front of this card to vote using the Internet and, when prompted, indicate that you agree to receive or access proxy materials electronically in future years. Important Notice Regarding the Availability of Proxy Materials for the Annual Meeting of Stockholders to be held on May 20, 2014. The Proxy Statement and our 2013 Annual Report on Form 10-K are available at: http://www.viewproxy.com/sm-energy/2014/. 1775 Sherman Street, Suite 1200 Denver, Colorado 80203 This proxy is solicited on behalf of the Board of Directors for the Annual Meeting of Stockholders to be held on May 20, 2014. The undersigned hereby appoints A. Wade Pursell, David W. Copeland, Brent A. Collins, and James B. Lebeck, or any of them, each with the power to appoint his substitute, as proxies for the undersigned to vote all shares of SM Energy Company common stock which the undersigned is entitled to vote at the Annual Meeting of Stockholders to be held on May 20, 2014, and at any reconvened meeting after any adjournment thereof, as directed on the matters referred to on the reverse side and at their discretion on any other matters that may properly be presented at the meeting, including concerning any adjournment of the meeting. This proxy when properly executed will be voted in the manner directed by the undersigned stockholder. If this proxy is properly executed but no voting direction is given, this proxy will be voted “FOR” all director nominees in Proposal 1, and “FOR” Proposals 2 and 3. This proxy also confers discretionary authority to the proxies to vote on any other matters that may properly be presented at the meeting, including concerning any adjournment of the meeting. As of the date of the accompanying proxy statement, SM Energy Company’s management did not know of any other matters to be presented at the meeting. If any other matters are properly presented at the meeting, including concerning any adjournment of the meeting, this proxy will be voted in accordance with the recommendations of SM Energy Company’s management. C Non-Voting Items Change of Address — Please print new address below. qIF YOU HAVE NOT VOTED VIA THE INTERNET OR TELEPHONE, FOLD ALONG THE PERFORATION, DETACH AND RETURN THE BOTTOM PORTION IN THE ENCLOSED ENVELOPE.q IF VOTING BY MAIL, YOU MUST COMPLETE SECTIONS A – C ON BOTH SIDES OF THIS CARD. + + 2014 Annual Meeting Admission Ticket 2014 Annual Meeting of SM Energy Company Stockholders May 20, 2014, at 3:30 p.m. Local Time J. D. Hershner Room of Wells Fargo Bank 1700 Lincoln Street Denver, Colorado Upon arrival, please present this admission ticket and photo identification at the registration desk. Attending and Voting in Person at the Annual Meeting: You should be prepared to present a valid form of photo identification, such as a driver’s license, state-issued ID card or passport along with the admission ticket portion of this proxy card. If you do not provide valid photo identification and otherwise comply with the procedures outlined above, you may not be admitted to the Annual Meeting. Directions to the Annual Meeting can be obtained by contacting our Corporate Secretary at (303) 861-8140.

Using a black ink pen, mark your votes with an X as shown in this example. Please do not write outside the designated areas. X 01SRME 1 U P X + q PLEASE FOLD ALONG THE PERFORATION, DETACH AND RETURN THE BOTTOM PORTION IN THE ENCLOSED ENVELOPE. q . + A The Board of Directors recommends a vote FOR all the nominees listed and FOR Proposals 2 and 3. For Against Abstain 1. The Board of Directors has nominated the below eight persons to stand for election as directors. As of the date of the accompanying proxy statement, no one has been nominated to serve as director other than the nominees listed below. 2. The proposal to ratify the appointment by the Audit Committee of Ernst & Young LLP as our independent registered public accounting firm for 2014. For Against Abstain 3. To approve, on a non-binding advisory basis, the compensation philosophy, policies and procedures, and the compensation of our Company’s named executive officers, as disclosed in the accompanying Proxy Statement. Annual Meeting Proxy Card 01 - Anthony J. Best 04 - William J. Gardiner 07 - John M. Seidl 02 - Larry W. Bickle 05 - Loren M. Leiker 03 - Stephen R. Brand 06 - Julio M. Quintana For Against Abstain For Against Abstain 08 - William D. Sullivan For Against Abstain IMPORTANT ANNUAL MEETING INFORMATION Authorized Signatures — This section must be completed for your vote to be counted. — Date and Sign Below B Please sign exactly as name(s) appears hereon. Joint owners should each sign. When signing as attorney, executor, administrator, corporate officer, trustee, guardian, or custodian, please give full title. Signature 1 — Please keep signature within the box. Signature 2 — Please keep signature within the box. Date (mm/dd/yyyy) — Please print date below. NNNNNNNNNNNN 1 8 6 1 9 1 2 NNNNNNNNN

q PLEASE FOLD ALONG THE PERFORATION, DETACH AND RETURN THE BOTTOM PORTION IN THE ENCLOSED ENVELOPE. q . Electronic Delivery of Future Proxy Materials If you would like to reduce the costs incurred by us in mailing proxy materials, you can consent to receiving all future proxy statements, proxy cards and annual reports electronically via e-mail or the Internet. To sign up for electronic delivery, please follow the instructions on the front of this card to vote using the Internet and, when prompted, indicate that you agree to receive or access proxy materials electronically in future years. Important Notice Regarding the Availability of Proxy Materials for the Annual Meeting of Stockholders to be held on May 20, 2014. The Proxy Statement and our 2013 Annual Report on Form 10-K are available at: http://www.viewproxy.com/sm-energy/2014/. Proxy — SM Energy Company 1775 Sherman Street, Suite 1200 Denver, Colorado 80203 This proxy is solicited on behalf of the Board of Directors for the Annual Meeting of Stockholders to be held on May 20, 2014. The undersigned hereby appoints A. Wade Pursell, David W. Copeland, Brent A. Collins, and James B. Lebeck, or any of them, each with the power to appoint his substitute, as proxies for the undersigned to vote all shares of SM Energy Company common stock which the undersigned is entitled to vote at the Annual Meeting of Stockholders to be held on May 20, 2014, and at any reconvened meeting after any adjournment thereof, as directed on the matters referred to on the reverse side and at their discretion on any other matters that may properly be presented at the meeting, including concerning any adjournment of the meeting. This proxy when properly executed will be voted in the manner directed by the undersigned stockholder. If this proxy is properly executed but no voting direction is given, this proxy will be voted “FOR” all director nominees in Proposal 1, and “FOR” Proposals 2 and 3. This proxy also confers discretionary authority to the proxies to vote on any other matters that may properly be presented at the meeting, including concerning any adjournment of the meeting. As of the date of the accompanying proxy statement, SM Energy Company’s management did not know of any other matters to be presented at the meeting. If any other matters are properly presented at the meeting, including concerning any adjournment of the meeting, this proxy will be voted in accordance with the recommendations of SM Energy Company’s management.