X0306 4 2021-02-25 0 0000766701 CAPSTEAD MORTGAGE CORP CMO 0001227321 REINSCH PHILLIP A 8401 N CENTRAL EXPRESSWAY SUITE 800 DALLAS TX 75225 1 1 0 0 President & CEO Common Stock 2021-02-25 4 M 0 25443 A 532234 D Restricted Stock Units 2021-02-25 4 M 0 65406 D Common Stock 65406 211359 D On January 3, 2018, the reporting person was granted 65,406 performance units (the "Units") which were convertible into common stock of the Issuer after the conclusion of the performance period beginning January 1, 2018 and ending December 31, 2020, with the conversion factor determined formulaically based on individual achievement of stated performance metrics outlined in the Issuer's 2018 Long-Term Award criteria, and the conversion date determined by the Issuer's Compensation Committee. As a result, 25,443 Units were converted into the Issuer's common stock on February 25, 2021, and 39,963 Units expired without converting into any common stock. Phillip A. Reinsch 2021-03-01