- Business
- Thornburg Investment Income Builder Fund Class A (TIBAX) is an open-end mutual fund that seeks to provide a high level of current income exceeding the average yield on U.S. stocks, with long-term capital appreciation as a secondary objective. Managed by Thornburg Investment Management, Inc., the fund invests at least 80% of its assets in income-producing securities, including at least 50% in common stocks, and a blend of bonds; its portfolio typically features diversified holdings across non-U.S. stocks (approximately 57%), U.S. stocks (23%), cash (12%), U.S. bonds (6%), and non-U.S. bonds (2%), with top sectors encompassing financial services, communication services, and technology. Key offerings include Class A shares with a 4.50% front-end load, a net expense ratio of 1.17%, and a minimum initial investment of $5,000, available primarily to U.S. investors through broker-dealers and financial advisors.
Launched on December 24, 2002, and domiciled in the United States, the fund is headquartered in Santa Fe, New Mexico, alongside its manager Thornburg Investment Management, which was founded in 1982 and oversees a range of multi-strategy mutual funds, institutional accounts, and UCITS funds with offices in London, Hong Kong, and Shanghai. The portfolio managers include Brian McMahon (since inception), Matt Burdett (since 2019), and Christian Hoffmann (since 2023), employing an active, globally diversified approach focused on dividend growth to support retirement income and long-term principal preservation. As of late 2025, total net assets stand at approximately $17.88 billion, with the Class A share class comprising $5.28 billion; recent portfolio characteristics reflect a weighted average market cap in the large-cap value style, an active share above benchmark, and top holdings such as Thornburg Capital Management Fund, Orange SA, Taiwan Semiconductor Manufacturing, Broadcom Inc., and Citigroup Inc.
In recent years, the fund has maintained its core multi-asset strategy within the Global Moderately Aggressive Allocation category, earning consistent 5-star Morningstar ratings across 3-, 5-, and 10-year periods as of November 2025, with no major acquisitions, partnerships, or structural reorganizations reported for Thornburg Investment Management or the fund itself. Portfolio turnover remains moderate, supporting tax-efficient income generation, while exposure spans regions like the Eurozone (32%), United States (23%), United Kingdom (11%), and developed Asia (9%). The fund continues to emphasize value-oriented large-cap investments and dividend cultivation amid evolving market conditions, with net expense ratios reaffirmed as of February 2025.