SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

SCHEDULE 13D/A

(Rule 13d-101)

INFORMATION TO BE INCLUDED IN STATEMENTS FILED PURSUANT

TO § 240.13d-1(a) AND AMENDMENTS THERETO FILED PURSUANT TO

§ 240.13d-1(a)

(Amendment No. 14)*

CLEARWIRE CORPORATION

(Name of Issuer)

Class A Common Stock

(Title of Class of Securities)

18538Q 105

(CUSIP Number)

Michael J. Egan

King & Spalding LLP

1180 Peachtree Street, N.E.

Atlanta, Georgia 30309

(404) 572-4600

(Name, address and telephone number of Person

Authorized to Receive Notices and Communications)

Gary D. Friedman

Friedman Kaplan Seiler & Adelman LLP

7 Times Square, 28^th Floor

New York, New York 10036

October 13, 2012

(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 §§ 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 § 240.13d-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 (the “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).

(Continued on following pages)

This Amendment No. 14 (this “Amendment”) is being filed by the Sprint Entities and the ERH Entities (each, as defined below) and amends and supplements the Statement on Schedule 13D which was jointly filed on December 5, 2008, as amended by Amendment No. 1 to the Statement on Schedule 13D which was jointly filed on February 27, 2009, as amended by Amendment No. 2 to the Statement on Schedule 13D which was jointly filed on November 12, 2009, as amended by Amendment No. 3 to the Statement on Schedule 13D which was jointly filed on December 22, 2009, as amended by Amendment No. 4 to the Statement on Schedule 13D which was jointly filed on December 7, 2010, as amended by Amendment No. 5 to the Statement on Schedule 13D which was jointly filed on December 14, 2010, as amended by Amendment No. 6 to the Statement on Schedule 13D which was jointly filed on May 13, 2011, as amended by Amendment No. 7 to the Statement on Schedule 13D which was jointly filed on June 8, 2011, as amended by Amendment No. 8 to the Statement on Schedule 13D which was jointly filed on December 16, 2011, as amended by Amendment No. 9 to the Statement on Schedule 13D which was jointly filed on February 24, 2012, as amended by Amendment No. 10 to the Statement on Schedule 13D which was jointly filed on March 14, 2012, as amended by Amendment No. 11 to the Statement on Schedule 13D which was jointly filed on June 15, 2012, as amended by Amendment No. 12 to the Statement on Schedule 13D which was jointly filed on September 14, 2012 and as amended by Amendment No. 13 to the Statement on Schedule 13D which was jointly filed on October 3, 2012 (collectively, the “Schedule 13D”) on behalf of Sprint Nextel Corporation, a Kansas corporation (“Sprint”), Sprint HoldCo, LLC, a Delaware limited liability company (“Sprint HoldCo” and together with Sprint, the “Sprint Entities”), Comcast Corporation, a Pennsylvania corporation (“Comcast”), Comcast Wireless Investment, LLC, a Delaware limited liability company (“Comcast LLC” and, together with Comcast, the “Comcast Entities”), Bright House Networks, LLC, a Delaware limited liability company (“BHN”), BHN Spectrum Investments, LLC, a Delaware limited liability company (“BHN Spectrum”), Newhouse Broadcasting Corporation, a New York corporation (“NBCo”, and collectively with BHN and BHN Spectrum, the “BHN Entities”), Eagle River Holdings, LLC, a Washington limited liability company (“ERH”) and Craig O. McCaw, an individual (“Mr. McCaw” and, together with ERH, the “ERH Entities”), with respect to the Class A common stock, par value $0.0001 per share (the “Class A Common Stock”), of Clearwire Corporation, a Delaware corporation (“Clearwire” or the “Issuer”). We refer to the Sprint Entities and the ERH Entities collectively herein as the “Reporting Persons” and to each as a “Reporting Person”. All capitalized terms used in this Amendment and not defined herein have the meanings ascribed to such terms in the Schedule 13D.

Item 3. Source and Amount of Funds or Other Consideration

Item 3 of the Schedule 13D is amended and supplemented by adding the following information under a new heading “ERH ROFO Notice”:

If Sprint HoldCo is the only Equityholder that exercises its rights under the ERH ROFO Notice (as defined below), the purchase price that would be paid at closing by Sprint HoldCo for 100% of the Interests (as defined below) is $100,000,063.55 (subject to adjustment for any Make Whole Payments, as discussed below), and the source of such funds would be from Sprint’s working capital.

Item 4. Purpose of Transaction.

Item 4 of the Schedule 13D is amended and supplemented by adding the following information under a new heading “ERH ROFO Notice”:

On October 17, 2012, ERH delivered an interest notice to the other Equityholders pursuant to Section 3.3 of the Equityholders’ Agreement (the “ERH ROFO Notice”). The ERH ROFO Notice provides notice to the Equityholders of ERH’s intent to transfer (i) 30,922,958 shares of Class A Common Stock (the “Class A Shares”) and (ii) 2,728,512 shares of Class B Common Stock and a corresponding number of Clearwire Communications Class B Common Interests (the “Class B Interests” and, together with the Class A Shares, the “Interests”) on the following material terms:

Pursuant to Section 3.3(b) of the Equityholders’ Agreement, each Equityholder shall have thirty (30) days from receipt of the ERH ROFO Notice to notify ERH of its election to purchase all or any portion of the Interests in accordance with the terms and conditions of the ERH ROFO Notice and the Equityholders’ Agreement.

On October 17, 2012, Sprint HoldCo delivered a response letter (“Sprint Response Letter”) to the ERH ROFO Notice notifying ERH that Sprint HoldCo elects to purchase 100% of the Interests at the purchase price set forth in the ERH ROFO Notice (or, in the event that one or more of the other Equityholders elects to purchase the Interests pursuant to a timely response notice, the maximum number of Interests that Sprint HoldCo is entitled to purchase pursuant to Section 3.3(b) of the Equityholders’ Agreement).

ERH had previously delivered an interest notice on October 13, 2012, to the other Equityholders pursuant to Section 3.3 of the Equityholders’ Agreement to which Sprint HoldCo had on that same date provided a Response Notice (as defined in the Equityholders’ Agreement) (together, the “Prior Notices”), which also covered the Interests reflected in the ERH ROFO Notice and certain additional shares owned by related parties and permitted an exercising Equityholder, under certain circumstances, to acquire the membership interests of ERH in lieu of acquiring the Interests directly. The Comcast Entities, the Intel Entities and the BHN Entities objected to certain contents of the Prior Notices and alleged that the Prior Notices were invalid. Although the Reporting Persons disagree with the merits of the objection and allegation, in the interest of avoiding a dispute over the Prior Notices, ERH and Sprint HoldCo agreed to revoke the Prior Notices, as a result of which neither has any obligations to the other thereunder, and ERH issued the ERH ROFO Notice to replace the Prior Notices (to which Sprint HoldCo responded with the Sprint Response Letter).

The foregoing summary of the ERH ROFO Notice and Sprint Response Letter is not intended to be complete and is qualified in its entirety by reference to the full text of such documents, which are filed as Exhibits 99.29 and 99.30 hereto, respectively, and are incorporated herein by reference.

Item 5. Interest in Securities of the Issuer.

Item 5(a), (b) and (c) of the Schedule 13D are hereby replaced in their entirety with the following:

(a)-(b) As of October 17, 2012, each Reporting Person may be deemed to have beneficial ownership (within the meaning of Rule 13d-3 under the Act) and shared power to vote or direct the vote of up to the amounts listed in the table below and may be deemed to constitute a “group” under Section 13(d) of the Act.

Except as set forth or incorporated herein or in the Appendices to the Schedule 13D, none of (i) the Reporting Persons and (ii) to the Sprint Entities’ knowledge, the persons set forth on Appendix A-1 and A-2 of the Schedule 13D, beneficially owns any shares of Class A Common Stock as of October 17, 2012.

In addition to the beneficial ownership of the Reporting Persons described herein, the Intel Entities, Intel Capital, Intel Cayman, Middlefield, the Comcast Entities and the BHN Entities may be deemed to be members of a “group” under Section 13(d) of the Act with the Reporting Persons by virtue of the Equityholders’ Agreement and have reported their beneficial ownership of securities of the Issuer separately, including the disclosure contained in Amendment No. 15 to Statement on Schedule 13D filed on October 5, 2012 filed by the Intel Entities, Intel Capital, Intel Cayman and Middlefield (the “Intel 13D/A”) and the disclosure contained in Amendment No. 13 to Statement on Schedule 13D filed on October 3, 2012 filed by the Comcast Entities, the BHN Entities, the Sprint Entities, the ERH Entities and the TWC Entities (as such term is defined in such Amendment) (the “Prior Joint 13D/A”). The Intel 13D/A and Prior 13D/A report beneficial ownership of 191,055,450 shares of Class A Common Stock (which consists of 88,504,132 shares of Class A Common Stock held by the Comcast Entities, 8,474,440 shares of Class B Common Stock held by the BHN Entities, 25,098,733 shares of Class A Common Stock held by Intel Capital, 3,333,333 shares of Class A Common Stock held by Intel Cayman and 65,644,812 shares of Class B Common Stock held by the Intel Entities). This beneficial ownership represents 13.0% of the Class A Common Stock held by the Comcast Entities, 1.2% of the Class A Common Stock held by the BHN Entities and 12.6% of the Class A Common Stock held by Intel Capital, Intel Cayman and the Intel Entities.

(c) Except as set forth or incorporated herein or in the Appendices to the Schedule 13D, none of (i) the Reporting Persons and (ii) to the Sprint Entities’ knowledge, the persons set forth on Appendices A-1 and A-2 of the Schedule 13D, has effected any transaction in Class A Common Stock during the 60 days prior to October 17, 2012.

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

The information under the subheading “ERH ROFO Notice” in Item 4 of this Schedule 13D is hereby incorporated by reference.

Item 7. Material to be Filed as Exhibits.

Item 7 of the Schedule 13D is hereby amended and supplemented by adding the following at the end thereof:

SIGNATURE

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

Dated: October 17, 2012

SIGNATURE

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

Dated: October 17, 2012

SIGNATURE

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

Dated: October 17, 2012

EXHIBIT INDEX