UNITED STATES
SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

SCHEDULE 14A

Proxy Statement Pursuant to Section 14(a) of the Securities
Exchange Act of 1934 (Amendment No.  )

Filed by the Registrant þ
Filed by a Party other than the Registrant o

Check the appropriate box:

o		Preliminary Proxy Statement
o		Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2))
o		Definitive Proxy Statement
þ		Definitive Additional Materials
o		Soliciting Material Pursuant to §240.14a-12

 

Capstead Mortgage Corporation

(Name of Registrant as Specified In Its Charter)

 

(Name of Person(s) Filing Proxy Statement, if other than the Registrant)

Payment of Filing Fee (Check the appropriate box):

þ		No fee required.
o		Fee computed on table below per Exchange Act Rules 14a-6(i)(1) and 0-11.

	(1)		Title of each class of securities to which transaction applies:
	(2)		Aggregate number of securities to which transaction applies:
	(3)		Per unit price or other underlying value of transaction computed pursuant to Exchange Act Rule 0-11 (set forth the amount on which the filing fee is calculated and state how it was determined):
	(4)		Proposed maximum aggregate value of transaction:
	(5)		Total fee paid:

o		Fee paid previously with preliminary materials.
o		Check box if any part of the fee is offset as provided by Exchange Act Rule 0-11(a)(2) and identify the filing for which the offsetting fee was paid previously. Identify the previous filing by registration statement number, or the Form or Schedule and the date of its filing.

	(1)		Amount Previously Paid:
	(2)		Form, Schedule or Registration Statement No.:
	(3)		Filing Party:
	(4)		Date Filed:

				COMPANY #

CAPSTEAD MORTGAGE CORPORATION

ANNUAL MEETING OF STOCKHOLDERS
Thursday, May 1, 2008
9:00 a.m. (Central)

THE CRESCENT CLUB
200 Crescent Court, 17th Floor
Dallas, TX 75201

Directions to the Capstead Mortgage Corporation 2008 Annual Meeting
of Stockholders are available on the back of this notice.

Important Notice Regarding the Annual Stockholder Meeting
to be Held on May 1, 2008 and the Availability of Proxy Materials.

Notice is hereby given that the Annual Meeting of Stockholders of Capstead Mortgage Corporation will be held at The Crescent Club, 200 Crescent Court, 17th Floor, Dallas, TX on Thursday, May 1, 2008 at 9:00 a.m. for purposes of acting on the matters set forth below.

This communication presents only an overview of the more complete proxy materials that are available to you on the Internet. We encourage you to access and review all of the important information contained in the proxy materials before voting.

The Proxy Statement and Annual Report are available at www.ematerials.com/CMO

If you want to receive a paper or e-mail copy of these documents, you must request one. There is no charge to you for requesting a copy. Please make your request for a copy as instructed on the reverse side of this notice on or before April 19, 2008 to facilitate timely delivery.

Matters intended to be acted upon at the meeting are listed below.

The Board of Directors recommends that you vote FOR the following proposals:

	1.		Election of Directors
	2.		Authorize an amendment to the Capstead Articles of Incorporation
	3.		Ratify Ernst & Young LLP as our independent registered public accounting firm

To request paper copies of the proxy materials, which include the proxy card,
proxy statement and annual report, please contact us via:

		Internet — Access the Internet and go to www.ematerials.com/CMO. Follow the instructions to log in, and order copies.
		Telephone — Call us free of charge at 866-697-9377 in the U.S. or Canada, using a touch-tone phone, and follow the instructions to log in and order copies.
		Email — Send us an email at ep@ematerials.com with “CMO Materials Request” in the subject line. The email must include:

	•		The 3-digit company # and the 11-digit control # located in the box in the upper right hand corner on the front of this notice.
	•		Your preference to receive printed materials via mail -or- to receive an email with links to the electronic materials.
	•		If you choose email delivery you must include the email address.
	•		If you would like this election to apply to delivery of material for all future meetings, write the word “Permanent” and include the last 4 digits of your Tax ID number in the email.

Directions to Capstead Annual Meeting of Stockholders