Thornburg Income Builder Opportunities Trust Announces Distribution

The Trust's monthly distribution is shown below:

Distribution rates are not performance and are calculated by summing the Trust's monthly distribution per share over four quarters and dividing by the net asset value or market price per share, as applicable, as of the distribution announcement date. Distributions on common shares are generally paid from net investment income (regular interest and dividends) and may also include capital gains and/or a return of capital. The Trust's distribution payable on September 19, 2025, is a long-term capital gain and does not include a short-term capital gain or a return of capital. The specific tax characteristics of the distributions will be reported to the Trust's common shareholders on Form 1099 after the end of the 2025 calendar year. The final determination for all distributions paid in 2025 will be made in early 2026 and reported to you on Form 1099-DIV. You should not use this notice as a substitute for your 1099-DIV.

The Trust's fiscal year (10/01/2024 through 09/30/2025) cumulative distributions are shown below:

Shareholders should not assume that the source of a distribution from the Trust is net income or profit. A distribution comprised in whole or in part by a return of capital does not necessarily reflect the Trust's investment performance and should not be confused with "yield" or "income." Future distributions may consist of a return of capital. For further information regarding the Trust's distributions, please visit www.thornburg.com/tbld-distributions.

The Trust's investment objective is to provide current income and additional total return. The Trust seeks to achieve its objective by investing, directly or indirectly, at least 80% of its managed assets in a broad range of income-producing securities. The Trust invests in both equity and debt securities of companies located in the United States and around the globe. The Trust may invest in non-U.S. domiciled companies, including up to 20% of its managed assets at the time of investment in equity and debt securities of emerging market companies.

As a registered investment company, the Trust is subject to a 4% excise tax that is imposed if the Trust does not distribute to common shareholders by the end of any calendar year at least the sum of (i) 98% of its ordinary income (not taking into account any capital gain or loss) for the calendar year and (ii) 98.2% of its capital gain in excess of its capital loss (adjusted for certain ordinary losses) for a one-year period generally ending on October 31 of the calendar year (unless an election is made to use the Trust's fiscal year). In certain circumstances, the Trust may elect to retain income or capital gain to the extent that the Board of Trustees, in consultation with Trust management, determines it to be in the interest of shareholders to do so.

The common share distributions paid by the Trust for any particular period may be more than the amount of net investment income from that period. As a result, all or a portion of a distribution may be a return of capital, which is in effect a partial return of the amount a common shareholder invested in the Trust, up to the amount of the common shareholder's tax basis in their common shares, which would reduce such tax basis. Although a return of capital may not be taxable, it will generally increase the common shareholder's potential gain, or reduce the common shareholder's potential loss, on any subsequent sale or other disposition of common shares.

About Thornburg

Thornburg Investment Management ("Thornburg") is an active, high-conviction manager of equities, fixed income, multi-asset and alternative solutions. As a privately owned firm and with $50 billion¹ in client assets as of July 31, 2025, Thornburg serves institutions, financial professionals and investors worldwide. The firm offers mutual funds, ETFs, closed-end funds, separate accounts and UCITS funds. Thornburg was founded in 1982 and is headquartered in Santa Fe, New Mexico with additional offices in Hong Kong and London. For more information, visit www.thornburg.com or call 877 215 1330.

This press release shall not constitute an offer to sell or a solicitation of an offer to buy, nor shall there be any offer, solicitation or sale of any securities in any state or jurisdiction in which such offer, solicitation or sale would be unlawful prior to registration or qualification under the laws of such state or jurisdiction. A registration statement relating to these securities has been filed with and declared effective by the U.S. Securities and Exchange Commission.

Certain statements in this press release constitute forward-looking statements, which involve known and unknown risks, uncertainties and other factors that may cause the actual results, levels of activity, performance or achievements of the Trust, or industry results, to be materially different from any future results, levels of activity, performance or achievements expressed or implied by such forward-looking statements. As a result, no assurance can be given as to future results, levels of activity, performance or achievements, and neither the Trust nor any other person assumes responsibility for the accuracy and completeness of such statements in the future.

Risk is inherent in all investing. There can be no assurance that the Trust will achieve its investment objective, and you could lose some or all of your investment.

Thornburg Securities LLC, member FINRA, is a wholly owned subsidiary of Thornburg Investment Management, Inc.

NOT FDIC INSURED      NO BANK GUARANTEE      MAY LOSE VALUE

Media Inquiries 

Michael Corrao

Director of Global Communications

Thornburg Investment Management

Tel: +1 505 467 5345

Email: mcorrao@thornburg.com

¹ Includes $49 billion in assets under management and $1 billion in assets under advisement as of July 31, 2025.

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SOURCE Thornburg Investment Management