Filed Pursuant to Rule 424(b)(5)
File No. 333-251076
PROSPECTUS SUPPLEMENT
(To prospectus dated
December 14, 2020)
Capstead Mortgage Corporation
Up to 15,000,000 shares of Common Stock
Up to 3,000,000 shares of 7.50% Series E Cumulative Redeemable Preferred Stock
We have entered into equity distribution agreements with JMP Securities LLC and JonesTrading Institutional Services LLC relating to shares of
our common stock, $0.01 par value per share, or our common stock, and shares of our 7.50% Series E Cumulative Redeemable Preferred Stock, $0.10 par value per share, or our Series E Preferred Stock, being offered by this prospectus supplement and the
accompanying prospectus. In accordance with the terms of the equity distribution agreements, we may offer and sell up to 15,000,000 shares of common stock and up to 3,000,000 shares of Series E Preferred Stock from time to time through JMP
Securities LLC and JonesTrading Institutional Services LLC and any additional agents appointed under separate equity distribution agreements in the future, as our placement agents, or the placement agents, for the offer and sale of these securities.
Our common stock is listed on The New York Stock Exchange (NYSE) under the symbol CMO. The last reported sale
price of our common stock on the NYSE on January 11, 2021 was $5.65 per share. Our Series E Preferred Stock is listed on the NYSE under the symbol CMOPRE. The last reported sale price of our Series E Preferred Stock on the
NYSE on January 11, 2021 was $24.39 per share.
Sales of our common stock or our Series E Preferred Stock, if any, under this
prospectus supplement and the accompanying prospectus may be made in negotiated transactions or transactions that are deemed to be at the market offerings, as defined in Rule 415 under the Securities Act of 1933, as amended, or the
Securities Act, including sales made directly on the NYSE or sales made to or through a market maker other than on an exchange. The placement agents will be entitled to compensation of up to 2.0% of the gross sales price per share for any shares of
common stock or Series E Preferred Stock sold under the equity distribution agreements. Under the terms of each equity distribution agreement, we may also sell our common stock and Series E Preferred Stock to a placement agent as principal for its
own account at a price agreed upon at the time of sale. If we sell common stock and Series E Preferred Stock to a placement agent as principal, we will enter into a separate terms agreement with that placement agent, and we will describe any such
agreement in a separate prospectus supplement or pricing supplement. In connection with the sale of the common stock and Series E Preferred Stock on our behalf, the placement agents may be deemed to be underwriters within the meaning of
the Securities Act, and the compensation of the placement agents may be deemed to be underwriting commissions or discounts.
We have
elected to be taxed as a real estate investment trust for federal income tax purposes (REIT). There are restrictions on ownership and transfer of our common stock and Series E Preferred Stock that are primarily intended to assist us in
qualifying as a REIT. See Description of Our StockPower to Redeem Shares and Restrict Transfers to Protect REIT Status in the accompanying prospectus.
Investing in our common stock and Series E Preferred Stock involves risk. See Risk Factors
beginning on page S-1 of this prospectus supplement, on page 2 of the accompanying prospectus, in our most recent Annual Report on Form 10-K, and in our periodic reports and other information we file from time
to time with the United States Securities and Exchange Commission, or SEC, for a discussion of risks you should consider before deciding to invest in our common stock and Series E Preferred Stock.
Neither the SEC nor any state or other securities commission has approved or disapproved of these securities or determined if this
prospectus supplement or the accompanying prospectus is truthful or complete. Any representation to the contrary is a criminal offense.
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JMP Securities
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JonesTrading
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The date of this prospectus supplement is January 12, 2021