X0202 SCHEDULE 13G 0001529735 XXXXXXXX LIVE Series H Mandatory Redeemable Preferred Shares 08/31/2026 0001171471 CALAMOS CONVERTIBLE OPPORTUNITIES & INCOME FUND 1281174@4 2020 Calamos Court Naperville IL 60563-2787 Rule 13d-1(b) MetLife Investment Management, LLC DE 345000 0 345000 0 345000 N 50 IA The percent of class is calculated based on 690,000 Series H Mandatory Redeemable Preferred Shares outstanding. CALAMOS CONVERTIBLE OPPORTUNITIES & INCOME FUND 2020 Calamos Court, Naperville, Illinois 60563-2787 MetLife Investment Management, LLC (the "Reporting Person") One MetLife Way, Whippany, New Jersey 07981 Delaware N IA As of August 31, 2026, the Reporting Person may be deemed to be the beneficial owner of 345,000 Series H Mandatory Redeemable Preferred Shares, representing 50% of the Series H Mandatory Redeemable Preferred Shares. This percentage is calculated based on 690,000 Series H Mandatory Redeemable Preferred Shares outstanding. 50% 345,000 0 345,000 0 Y N The Reporting Person manages these Series H Mandatory Redeemable Preferred Shares on behalf of various clients, including 21St Century Insurance Company, Metropolitan Life Insurance Company and Metropolitan Tower Life Insurance Company. Y Y Y N By signing below I certify that, to the best of my knowledge and belief, the securities referred to above were acquired and are held in the ordinary course of business and were not acquired and are not held for the purpose of or with the effect of changing or influencing the control of the issuer of the securities and were not acquired and are not held in connection with or as a participant in any transaction having that purpose or effect, other than activities solely in connection with a nomination under § 240.14a-11. MetLife Investment Management, LLC /s/ Israel Grafstein 09/08/2026