Summary

• Thornburg Investment Income Builder Fund paid ordinary dividends of $0.26 per I share during Q1'2026, +7.9% versus Q1'25.
• The net asset value of Investment Income Builder's I shares increased by +$8.40 per share ($27.79 to $36.19) over the trailing 12 months and increased by +$3.00 per share ($33.19 to $36.19) during the March quarter.
• The quarter ending March 31, 2026, was the 93rd full calendar quarter since the inception of Thornburg Investment Income Builder in December 2002.

This note will highlight the results of the Thornburg Investment Income Builder Fund for Q1 2026. It is published amidst the ongoing developments associated with the Russian war with Ukraine, Mideast violence, and ongoing inflation concerns in the