Morningstar

Thornburg Investment Income Builder Fund Class R5 TIBMX

Medalist Rating as of Sep 14, 2026 See Thornburg Investment Hub

Strategy

The investment seeks to provide a level of current income which exceeds the average yield on U.S. stocks; long-term capital appreciation is a secondary objective. The fund pursues its investment goals by investing in a broad range of income producing securities, primarily including stocks and bonds. It will under normal conditions invest at least 80% of its net assets, plus the amount of any borrowings for investment purposes, in income-producing securities, and at least 50% of its net assets, plus the amount of any borrowings for investment purposes, in common stocks.

Ticker	Name	Share Class Type	Investment Status	Morningstar Rating for Funds Overall	Medalist Rating Overall	Inception Date	Total Net Assets for Share Class	Adjusted Expense Ratio	Fee Level Distribution	Minimum Initial Investment	1-Year Net Flow
TIBIX	Thornburg Investment Income Builder Fund Class I	Institutional	Open			Nov 3, 2003	$15.62B	0.910%	Above Average	$3M	$1.11B
TIBAX	Thornburg Investment Income Builder Fund Class A	Front Load	Open			Dec 24, 2002	$6.32B	1.150%	Above Average	$1,000	−$189.58M
TIBCX	Thornburg Investment Income Builder Fund Class C	Level Load	Open			Dec 24, 2002	$730.72M	1.900%	High	$1,000	−$7.09M
TIBMX	Thornburg Investment Income Builder Fund Class R5	Retirement, Large	Open			Feb 1, 2007	$24.09M	1.020%	High	$0	−$1.14M
TIBOX	Thornburg Investment Income Builder Fund Class R6	Retirement, Large	Open			Apr 10, 2017	$376.12M	0.830%	Above Average	$0	$893,370.68
TIBRX	Thornburg Investment Income Builder Fund Class R3	Retirement, Medium	Open			Feb 1, 2005	$24.58M	1.520%	High	$0	−$4.26M
TIBGX	Thornburg Investment Income Builder Fund Class R4	Retirement, Medium	Open			Feb 1, 2008	$14.72M	1.270%	Average	$0	−$521,562.13

Sponsor Center

Transparency is our policy. Learn how it impacts everything we do

Transparency is how we protect the integrity of our work and keep empowering investors to achieve their goals and dreams. And we have unwavering standards for how we keep that integrity intact, from our research and data to our policies on content and your personal data.

We’d like to share more about how we work and what drives our day-to-day business.

How we make money

We sell different types of products and services to both investment professionals and individual investors. These products and services are usually sold through license agreements or subscriptions. Our investment management business generates asset-based fees, which are calculated as a percentage of assets under management. We also sell both admissions and sponsorship packages for our investment conferences and advertising on our websites and newsletters.

How we use your personal data

How we use your information depends on the product and service that you use and your relationship with us. We may use it to:

Verify your identity, personalize the content you receive, or create and administer your account.
Provide specific products and services to you, such as portfolio management or data aggregation.
Develop and improve features of our offerings.
Gear advertisements and other marketing efforts towards your interests.

To learn more about how we handle and protect your data, visit our privacy center.

How we approach editorial content

Maintaining independence and editorial freedom is essential to our mission of empowering investor success. We provide a platform for our authors to report on investments fairly, accurately, and from the investor’s point of view. We also respect individual opinions––they represent the unvarnished thinking of our people and exacting analysis of our research processes. Our authors can publish views that we may or may not agree with, but they show their work, distinguish facts from opinions, and make sure their analysis is clear and in no way misleading or deceptive.

To further protect the integrity of our editorial content, we keep a strict separation between our sales teams and authors to remove any pressure or influence on our analyses and research.

Read our editorial policy to learn more about our process.

© Copyright 2026 Morningstar, Inc. All rights reserved. Dow Jones Industrial Average, S&P 500, Nasdaq, and Morningstar Index (Market Barometer) quotes are real-time.