UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

SCHEDULE 13D

Under the Securities Exchange Act of 1934

(Amendment No.     )*

Symmetry Surgical Inc.

(Name of Issuer)

Common Stock, $0.0001 par value

(Title of Class of Securities)

87159G100

(CUSIP Number)

Jacob D. Smith

Principal, General Counsel & CCO

Luther King Capital Management Corporation

301 Commerce Street, Suite 1600

Fort Worth, Texas 76102

(817) 332-3235

(Name, Address and Telephone Number of Persons Authorized to Receive Notices and Communications)

August 19, 2015

(Date of Event which Requires Filing of this Statement)

If the filing person has previously filed a statement on Schedule 13G to report the acquisition that is the subject of this Schedule 13D, and is filing this schedule because of Sections 240.13d-1(e), 240.13d-1(f) or 240.13d-1(g), check the following box.  ¨

Note: Schedules filed in paper format shall include a signed original and five copies of the schedule, including all exhibits. See Section 13d-7 for other parties to whom copies are to be sent.

The information required on the remainder of this cover page shall not be deemed to be “filed” for the purpose of Section 18 of the Securities Exchange Act of 1934 (“Act”) or otherwise subject to the liabilities of that section of the Act but shall be subject to all other provisions of the Act (however, see the Notes).

Persons who response to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB control number.

Item 1. Security and Issuer

This Schedule 13D relates to the Common Stock, $0.0001 par value (“Common Stock”), of Symmetry Surgical Inc., a Delaware corporation (the “Issuer”). The address of the principal executive offices of the Issuer is 3034 Owen Drive, Antioch, TN 37013.

Item 2. Identity and Background

(a) The names of the persons filing this Schedule 13D are LKCM Private Discipline Master Fund SPC, a Cayman Islands segregated portfolio company (“PDP”), LKCM Micro-Cap Partnership, L.P., a Delaware limited partnership (“Micro”), LKCM Core Discipline, L.P., a Delaware limited partnership (“Core”), Luther King Capital Management Corporation, a Delaware corporation (“LKCM”), J. Luther King, Jr. and J. Bryan King. PDP, Micro, Core, LKCM, J. Luther King, Jr. and J. Bryan King are collectively referred to herein as the “Reporting Persons.”

(b) The principal business address of PDP is c/o Five Continents Financial Limited, 4^th Floor, Anderson Square, 64 Shedden Road, P.O. Box 10324, Grand Cayman KY1-1003, Cayman Islands, and the principal business address of the other Reporting Persons is 301 Commerce Street, Suite 1600, Fort Worth, Texas 76102.

(c) LKCM Private Discipline Management, L.P., a Delaware limited partnership (“PDP GP”), is the sole holder of the management shares of PDP, and LKCM Alternative Management, LLC, a Delaware limited liability company (“PDP Management”) is the general partner of PDP GP. LKCM Micro-Cap Management, L.P., a Delaware limited partnership (“Micro GP”), is the general partner of Micro-Cap, and PDP Management is the general partner of Micro GP. LKCM Core Discipline Management, L.P., a Delaware limited partnership (“Core GP”), is the general partner of Core, and PDP Management is the general partner of Core GP. LKCM serves as the investment manager for PDP, Micro and Core. J. Luther King, Jr. is a controlling shareholder of LKCM, and J. Luther King, Jr. and J. Bryan King are controlling members of PDP Management. The principal business of PDP, Micro and Core is purchasing, holding and selling securities for investment purposes, and the principal business of the other Reporting Persons is investment management.

(d) and (e) During the past five years, none of the Reporting Persons has been convicted in a criminal proceeding or been a party to a civil proceeding, in either case of the type specified in Items 2(d) or (e) of Schedule 13D.

(f) PDP is organized under the laws of the Cayman Islands. Micro, Core and LKCM are organized under the laws of Delaware. J. Luther King, Jr. and J. Bryan King are citizens of the United States.

Item 3. Source and Amount of Funds or Other Consideration

Master Fund acquired 749,485 shares of Common Stock in open market transactions for an aggregate purchase price of approximately $6,590,000 using working capital. Micro acquired 25,000 shares of Common Stock in open market transactions for an aggregate purchase price of approximately $222,000 using working capital. Core acquired 8,000 shares of Common Stock in open market transactions for an aggregate purchase price of approximately $70,000 using working capital.

Item 4. Purpose of Transaction

The Reporting Persons have acquired the shares of Common Stock for investment purposes. The Reporting Persons from time to time intend to review their investment in the Issuer on the basis of various factors, including the Issuer’s business, financial condition, results of operations and prospects, general economic and industry conditions, the securities markets in general and those for the Issuer’s securities in general, as well as other developments and other investment opportunities. Based upon such review, the Reporting Persons intend to take such actions in the future as they deem appropriate in light of the circumstances existing from time to time, which may include further acquisitions of Common Stock or disposal of all of the shares of Common Stock currently owned by the Reporting Persons or otherwise acquired by the Reporting Persons, either in the open market or privately negotiated transactions, with or without prior notice.

In addition, the Reporting Persons may engage in communications with one or more shareholders, officers or directors of the Issuer, including discussions regarding the Issuer’s operations and strategic direction and ideas that, if effected, could result in, among other things, any of the matters identified in Item 4(a)-(j) of Schedule 13D. The Reporting Persons reserve their right, based on all relevant factors and subject to applicable law, at any time and from time to time, to review or reconsider their position, change their purpose, take other actions (including actions that could involve one or more of the types of transactions or have one or more the results described in Item 4(a)-(j) of Schedule 13D) or formulate and implement plans or proposals with respect to any of the foregoing.

Item 5. Interest in Securities of the Issuer

(a) As of August 19, 2015, the Reporting Persons may be deemed to beneficially own 782,485 shares of Common Stock (which represents approximately 7.6% of the outstanding Common Stock based upon information contained in the Issuer’s Form 10-Q for the period ended July 4, 2015).

(c) During the past sixty days, the Reporting Persons purchased the following shares of Common Stock in open market transactions.

(d) Not applicable.

(e) Not applicable.

Item 6. Contracts, Arrangements, Understandings or Relationships with Respect to Securities of the Issuer

Except as otherwise provided herein, there are no contracts, arrangements, understandings, or relationships between the Reporting Persons and any other person with respect to the securities of the Issuer.

Item 7. Material to Be Filed as Exhibits

SIGNATURE

After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct.

Date: August 20, 2015

EXHIBIT 1

JOINT FILING AGREEMENT

In accordance with Rule 13d-1(k) promulgated under the Securities Exchange Act of 1934, as amended, the persons named below agree to the joint filing on behalf of each of them a Statement on Schedule 13D (including amendments thereto) with regard to the Common Stock, $0.0001 par value, of Symmetry Surgical Inc., a Delaware corporation, and further agree that this Joint Filing Agreement be included as an Exhibit to such joint filings. In evidence thereof, the undersigned, being duly authorized, hereby execute this Joint Filing Agreement as of August 20, 2015.